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USER MANUAL SN74HCT273N TEXAS INSTRUMENTS
SNx4HCT273 Octal D-Type Flip-Flops With Clear
1 Features
- Operating voltage range of 4.5 V to 5.5 V
• Outputs can drive up to 10 LSTTL loads - Low power consumption, 80 μA maximum I cc
• Typical t _pd = 12 ns - ±4 mA output drive at 5 V
- Low input current of 1 A maximum
- Inputs are TTL-voltage compatible
- Contain eight D-type flip-flops
- Direct clear input
2 Applications
• Buffer or storage registers
- Shift registers
- Pattern generators
3 Description
These devices are positive-edge-triggered D-type flip-flops with a common enable input. The 'HCT273 devices are similar to the 'HCT377 devices, but feature a common clear enable (CLR) input instead of a latched clock.
Device Information ^(1)
| PART NUMBER | PACKAGE BODY SIZE (NOM) | |
| SN74HCT273DW SO | C (20) 12.80 mm | × 7.50 mm |
| SN74HCT273DB SSOP | (20) 7.20 mm | × 5.30 mm |
| SN74HCT273N PDIP | (20) 25.40 mm × | 6.35 mm |
| SN74HCT273NS SO | (20) 15.00 mm × | 5.30 mm |
| SN74HCT273PW | TSSOP (20) | 6.50 mm × 4.40 mm |
(1) For all available packages, see the orderable addendum at the end of the data sheet.

Logic Diagram, Each Flip Flop (positive logic)
Table of Contents
1 Features....1
2 Applications....1
3 Description....1
4 Revision History....2
5 Pin Configuration and Functions....3
6 Specifications....4
6.1 Absolute Maximum Ratings.... 4
6.2 Recommended Operating Conditions ^(1) 4
6.3 Thermal Information....4
6.4 Electrical Characteristics....5
6.5 Timing Requirements....5
6.6 Switching Characteristics....6
6.7 Switching Characteristics....6
6.8 Operating Characteristics.... 6
7 Parameter Measurement Information.... 7
8 Detailed Description....8
8.1 Overview....8
8.2 Functional Block Diagram.... 8
8.3 Device Functional Modes......8
9 Power Supply Recommendations....9
10 Layout....9
10.1 Layout Guidelines....9
11 Device and Documentation Support....10
11.1 Receiving Notification of Documentation Updates.. 10
11.2 Support Resources.... 10
11.3 Trademarks.... 10
11.4 Electrostatic Discharge Caution.... 10
11.5 Glossary.... 10
12 Mechanical, Packaging, and Orderable Information....10
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (August 2003) to Revision F (February 2022) Page
- Updated the numbering, formatting, tables, figures, and cross-references throughout the document to reflect modern data sheet standards....1
5 Pin Configuration and Functions

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CLR 1 ○ 1Q 2 1D 3 2D 4 2Q 5 3Q 6 3D 7 3Q 8 3D 9 GND 10 20 Vcc 19 8Q 18 8D 17 7D 16 7Q 15 6Q 14 6D 13 5D 12 5Q 11 CLKDB, DW, N, NS, or PW package 20-Pin SSOP, SOIC, PDIP, SO, or TSSOP (Top View)

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1D 1Q CLR Vcc 8Q 2D 3 2 1 20 19 8D 2Q 4 5 17 7D 3Q 6 16 7Q 3D 7 15 6Q 4D 8 14 6D 4Q 9 10 11 12 13 GND CLK 5Q 5DFK package 20-Pin LCCC (Top View)
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) ^(1)
| MIN MAX UNIT | ||||
| V_CC | Supply voltage range -0.5 7 V | |||
| I_IK | Input clamp current(2) | V_I < 0 or V_I > V_CC | ±20 | mA |
| I_OK | Output clamp current(2) | V_O < 0 or V_O > V_CC | ±20 | mA |
| I_O | Continuous output current V | o = 0 to V_CC | ±25 | mA |
| Continuous current through V_CC or GND ±50 mA | ||||
| T_J | Junction temperature 150 °C | |||
| T_stg | Storage temperature range -65 150 °C | |||
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) The input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed.
6.2 Recommended Operating Conditions ^(1)
| SN54HCT273(2) | SN74HCT273 | UNIT | |||||||
| MIN NOM MAX MIN | NOM | MAX | |||||||
| V_CC | Supply voltage | 4.5 | 5 | 5.5 | 4.5 | 5 | 5.5 | V | |
| V_IH | High-level input voltage | V_CC=4.5V to 5.5V | 2 | 2 | V | ||||
| V_IL | Low-level input voltage | V_CC=4.5V to 5.5V | 0.8 | 0.8 | V | ||||
| V_I | Input voltage | 0 | V_CC | 0 | V_CC | V | |||
| V_O | Output voltage | 0 | V_CC | 0 | V_CC | V | |||
| t/ v | Input transition rise or fall rate | 500 | 500 | ns/V | |||||
| T_A | Operating free-air temperature | -55 | 125 | -40 | 85 | °C | |||
(1) All unused inputs of the device must be held at V CC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
(2) Product Preview
6.3 Thermal Information
| THERMAL METRIC | DW (SOIC) | DB (SSOP) | N (PDIP) | NS (SO) | PW (TSSOP) | UNIT | |
| 20 PINS | 20 PINS | 20 PINS | 20 PINS | 20 PINS | |||
| R_ JA | Junction-to-ambient thermal resistance(1) | 58 | 70 | 69 | 60 | 83 | °C/W |
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC package thermal metrics application report.
6.4 Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise noted)
| PARAMETER | TEST CONDITIONS V | cc | T_A=25°C SN54HCT273 (1) | SN74HCT273 | UNIT | |||
| MIN TYP MAX MIN MAX MIN MAX | ||||||||
| V_OH | V_I=V_IH or V_IL | I_OH=-20 μA 4.5 V | 4.4 4.499 4.4 4.4 | V | ||||
| I_OH=-4 mA 4.5 V | 3.98 4.30 3.7 3.84 | |||||||
| V_OL | V_I=V_IH or V_IL | I_OL=20 μA | 4.5 V | 0.001 | 0.1 | 0.1 | 0.1 | V |
| I_OL=4 mA | 4.5 V | 0.17 | 0.26 | 0.4 | 0.33 | |||
| I_I | V_I=V_CC or 0 | 5.5 V | ±0.1 | ±100 | ±1000 | ±1000 | nA | |
| I_CC | V_I=V_CC or 0, I O=0 | 5.5 V | 8 | 160 80 μA | ||||
| I_CC^(2) | One input at 0.5 V or 2.4 V,Other inputs at 0 or V_CC | 5.5 V | 1.4 | 2.4 | 3 | 2.9 | mA | |
| C_i | 4.5 V to 5 V | 3 | 10 | 10 | 10 pF | |||
(1) Product Preview
(2) This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or V_CC .
6.5 Timing Requirements
over recommended operating free-air temperature range (unless otherwise noted)
| PARAMETER | V_cc | T_A=25°C | SN54HCT273(1) | SN74HCT273 | UNIT | |||||
| MIN | MAX | MIN | MAX | MIN | MAX | |||||
| f_clock | Clock frequency | 4.5 V | 25 | 16 | 20 | MHz | ||||
| 5.5 V | 28 | 19 | 23 | |||||||
| t_w | Pulse duration | CLK high or low | 4.5 V | 20 | 30 | 25 | ns | |||
| 5.5 V | 18 | 25 | 22 | |||||||
| low | 4.5 V | 16 | 24 | 20 | ||||||
| 5.5 V | 14 | 20 | 17 | |||||||
| t_su | Setup time before CLK↑ | Data | 4.5 V | 20 | 30 | 25 | ns | |||
| 5.5 V | 17 | 25 | 21 | |||||||
| inactive | 4.5 V | 20 | 30 | 25 | ||||||
| 5.5 V | 17 | 25 | 21 | |||||||
| t_h | Hold time, data after CLK↑ | 4.5 V | 0 | 0 | 0 | ns | ||||
| 5.5 V | 0 | 0 | 0 | |||||||
(1) Product Preview
6.6 Switching Characteristics
over recommended operating free-air temperature range, V_CC = 5 V ± 0.5 V (unless otherwise noted) (see Parameter Measurement Information)
| PARAMETER | FROM(INPUT) | TO(OUTPUT) | V_cc | SN54HCT273(1) | UNITT | |
| A=25°C | MIN MAX | |||||
| MIN TYP MAX | ||||||
| f_max | 4.5 V 25 31 16 | MHz | ||||
| 5.5 V 28 37 19 | ||||||
| t_pd | CLR Any | 4.5 V 15 34 50 | ns | |||
| 5.5 V 12 29 42 | ||||||
| t_PHL | CLR Any | 4.5 V 17 15 50 | ns | |||
| 5.5 V 15 34 42 | ||||||
| t_t | Any | 4.5 V 8 18 22 | ns | |||
| 5.5 V 7 19 21 | ||||||
(1) Product Preview
6.7 Switching Characteristics
over recommended operating free-air temperature range, V_CC = 5 V ± 0.5 V (unless otherwise noted) (see Parameter Measurement Information)
| PARAMETER | FROM(INPUT) | TO(OUTPUT) | V_cc | SN74HCT273 | UNITT | |
| A=25°C | MIN MAX | |||||
| MIN TYP MAX | ||||||
| f_max | 4.5 V 25 31 20 | MHz | ||||
| 5.5 V 28 37 23 | ||||||
| t_pd | CLR Any | 4.5 V 15 34 42 | ns | |||
| 5.5 V 12 29 36 | ||||||
| t_PHL | CLR Any | 4.5 V 17 34 42 | ns | |||
| 5.5 V 15 29 36 | ||||||
| t_t | Any | 4.5 V 8 15 19 | ns | |||
| 5.5 V 7 14 17 | ||||||
6.8 Operating Characteristics
$$ V _ {C C} = 5 \mathrm{V}, T _ {\mathrm{A}} = 2 5 ^ {\circ} \mathrm{C} $$
| PARAMETER TEST CONDITIONS TYP UNIT | ||||
| C_pd | Power dissipation capacitance | No load | 30 | pF |
7 Parameter Measurement Information
Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, Z_O = 50 , t_t < 6 ns.
For clock inputs, f_max is measured when the input duty cycle is 50%.
The outputs are measured one at a time with one input transition per measurement.

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Test Point1 From Output Under Test C_L^(1)(1) C_L includes probe and test-fixture capacitance.
Figure 7-1. Load Circuit for Push-Pull Outputs

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Input 1.3V 1.3V tw 3V 0 VFigure 7-2. Voltage Waveforms, TTL-Compatible CMOS Inputs Pulse Duration

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Clock Input 1.3V 3V 0 V tsu tn Data Input 1.3V 1.3V 3V 0 VFigure 7-3. Voltage Waveforms, TTL-Compatible CMOS Inputs Setup and Hold Times

other
| Waveform | Input (V) | Output Waveform 1 (%) | Output Waveform 2 (%) | |-----------|-----------|------------------------|------------------------| | 0 | 0 | - | - | | 1.3 | 1.3 | 50% | 50% | | 3 | 3 | - | - |(1) The greater between t_PLH and t_PHL is the same as t_pd .
Figure 7-4. Voltage Waveforms, Propagation Delays for TTL-Compatible Inputs
8 Detailed Description
8.1 Overview
These devices are positive-edge-triggered D-type flip-flops with a common enable input. The 'HCT273 devices are similar to the 'HCT377 devices, but feature a common clear enable (CLR) input instead of a latched clock.
Information at the data (D) inputs meeting the setup time requirements is transferred to the Q outputs on the positive-going edge of the clock (CLK) pulse. Clock triggering occurs at a particular voltage level and is not directly related to the positive-going pulse. When CLK is at either the high or low level, the D input has no effect at the output. The circuits are designed to prevent false clocking by transitions at CLR.
8.2 Functional Block Diagram

flowchart
graph LR
CLK["CLK 11"] --> A["1D C1 R"]
CLR["CLR 1"] --> B["1D C1 R"]
A --> C["1D C1 R"]
B --> D["1D C1 R"]
C --> E["1D C1 R"]
D --> F["1D C1 R"]
E --> G["1D C1 R"]
F --> H["1D C1 R"]
G --> I["1D C1 R"]
H --> J["1D C1 R"]
I --> K["1D C1 R"]
J --> L["1D C1 R"]
K --> M["8D 18"]
L --> N["8D 18"]
M --> O["8D 18"]
N --> P["8D 18"]
O --> Q["8D 18"]
P --> R["8D 18"]
Q --> S["8Q 19"]
R --> T["8Q 19"]
S --> U["8Q 19"]
Figure 8-1. Logic Diagram (positive logic)

flowchart
graph TD
D --> TG1["TG"]
TG1 --> C1["C"]
C1 --> TG2["AND"]
TG2 --> C2["C"]
C2 --> TG3["TG"]
TG3 --> C3["C"]
C3 --> TG4["AND"]
TG4 --> C4["C"]
C4 --> TG5["TG"]
TG5 --> C5["C"]
C5 --> TG6["AND"]
TG6 --> C6["C"]
C6 --> TG7["TG"]
TG7 --> C7["C"]
C7 --> TG8["AND"]
TG8 --> C8["C"]
C8 --> TG9["TG"]
TG9 --> C9["C"]
C9 --> TG10["AND"]
TG10 --> Q
CLK(I) --> INV1["NOT"]
INV1 --> INV2["NOT"]
INV2 --> INV3["NOT"]
INV3 --> INV4["NOT"]
INV4 --> INV5["NOT"]
INV5 --> INV6["NOT"]
INV6 --> INV7["NOT"]
INV7 --> INV8["NOT"]
INV8 --> INV9["NOT"]
INV9 --> INV10["NOT"]
Figure 8-2. Logic Diagram, each flip-flop (potitive logic)
8.3 Device Functional Modes
Table 8-1. Function Table (Each Flip-Flop)
| INPUTS | OUTPUTQ | ||
| CLR CLK D | |||
| LXXL | |||
| H↑HH | |||
| H↑LL | |||
| HLXQ | 0 | ||
9 Power Supply Recommendations
The power supply can be any voltage between the minimum and maximum supply voltage rating located in the Recommended Operating Conditions. Each V_CC terminal should have a good bypass capacitor to prevent power disturbance. A 0.1- F capacitor is recommended for this device. It is acceptable to parallel multiple bypass caps to reject different frequencies of noise. The 0.1- F and 1- F capacitors are commonly used in parallel. The bypass capacitor should be installed as close to the power terminal as possible for best results.
10 Layout
10.1 Layout Guidelines
When using multiple-input and multiple-channel logic devices inputs must not ever be left floating. In many cases, functions or parts of functions of digital logic devices are unused; for example, when only two inputs of a triple-input AND gate are used or only 3 of the 4 buffer gates are used. Such unused input pins must not be left unconnected because the undefined voltages at the outside connections result in undefined operational states. All unused inputs of digital logic devices must be connected to a logic high or logic low voltage, as defined by the input voltage specifications, to prevent them from floating. The logic level that must be applied to any particular unused input depends on the function of the device. Generally, the inputs are tied to GND or V CC, whichever makes more sense for the logic function or is more convenient.
11 Device and Documentation Support
TI offers an extensive line of development tools. Tools and software to evaluate the performance of the device, generate code, and develop solutions are listed below.
11.1 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. Click on Subscribe to updates to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document.
11.2 Support Resources
TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight from the experts. Search existing answers or ask your own question to get the quick design help you need.
Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use.
11.3 Trademarks
TI E2E ^TM is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
11.4 Electrostatic Discharge Caution

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
11.5 Glossary
TI Glossary This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
PACKAGING INFORMATION
| Orderable Device Status(1) | Package Type | Package Drawing | Pins | Package Qty | Eco Plan(2) | Lead finish/ Ball material(6) | MSL Peak Temp(3) | Op Temp (°C) | Device Marking(4-5) | Samples | |
| SN74HCT273DBR ACTIVE SSOP DB 20 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 HT273 | Samples | ||||||||||
| SN74HCT273DW | ACTIVE | SOIC | DW | 20 | 25 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HCT273 | Samples |
| SN74HCT273DWE4 | ACTIVE | SOIC | DW | 20 | 25 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HCT273 | Samples |
| SN74HCT273DWG4 | ACTIVE | SOIC | DW | 20 | 25 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HCT273 | Samples |
| SN74HCT273DWR | ACTIVE | SOIC | DW | 20 | 2000 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HCT273 | Samples |
| SN74HCT273DWRG4 | ACTIVE | SOIC | DW | 20 | 2000 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HCT273 | Samples |
| SN74HCT273N | ACTIVE | PDIP | N | 20 | 20 | RoHS & Green | NIPDAU | N / A for Pkg Type | -40 to 85 | SN74HCT273N | Samples |
| SN74HCT273NSR | ACTIVE | SO | NS | 20 | 2000 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HCT273 | Samples |
| SN74HCT273PW | ACTIVE | TSSOP | PW | 20 | 70 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HT273 | Samples |
| SN74HCT273PWE4 | ACTIVE | TSSOP | PW | 20 | 70 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HT273 | Samples |
| SN74HCT273PWR | ACTIVE | TSSOP | PW | 20 | 2000 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HT273 | Samples |
| SN74HCT273PWT | ACTIVE | TSSOP | PW | 20 | 250 | RoHS & Green | NIPDAU | Level-1-260C-UNLIM | -40 to 85 | HT273 | Samples |
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "\~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer: The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION

*All dimensions are nominal
| Device Package | Type | Package Drawing | Pins | SPQ Reel | Diameter (mm) | Reel Width W1 (mm) | A0 (mm) | B0 (mm) | K0 (mm) | P1 (mm) | W (mm) | Pin1 Quadrant |
| SN74HCT273DBR SS | OP DB 20 | 2000 330.0 | 16.4 | 8.2 7.5 2.5 | 12.0 16.0 | Q1 | ||||||
| SN74HCT273DWR SC | IC DW 20 | 2000 330.0 | 24.4 | 10.9 13.3 | 2.7 12.0 24.0 | Q1 | ||||||
| SN74HCT273NSR SO | NS 20 2000 | 330.0 24.4 | 8.4 | 13.0 2.5 | 2.0 24.0 | Q1 | ||||||
| SN74HCT273PWR TS | SOP PW 20 | 2000 330.0 | 16 | 4 6.95 7.0 | 1.4 8.0 16.0 | Q1 | ||||||
| SN74HCT273PWT TS | SOP PW | 20 | 250 3 | 30.0 16.4 | 6.95 7.1 1.6 | 8.0 16.0 | Q1 |

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TAPE AND REEL BOX DIMENSIONS W L*All dimensions are nominal
| Device | Package Type | Package Drawing | Pins | SPQ | Length (mm) | Width (mm) | Height (mm) |
| SN74HCT273DBR SSOP | DB 20 2000 853.0 | 449.0 35.0 | |||||
| SN74HCT273DWR SO | C DW 20 2000 367.0 | 367.0 45.0 | |||||
| SN74HCT273NSR SO | NS 20 2000 367.0 | 367.0 45.0 | |||||
| SN74HCT273PWR | TSSOP | PW | 20 | 2000 | 853.0 | 449.0 | 35.0 |
| SN74HCT273PWT | TSSOP | PW | 20 | 250 | 853.0 | 449.0 | 35.0 |
TUBE

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T - Tube height L - Tube length W - Tube width B - Alignment groove width*All dimensions are nominal
| Device | Package Name | Package Type | Pins | SPQ | L (mm) | W (mm) | T (μm) | B (mm) |
| SN74HCT273DW DW | SOIC 20 25 507 12.83 5080 6.6 | |||||||
| SN74HCT273DWE4 DW | SOIC 20 25 507 12.83 5080 6.6 | |||||||
| SN74HCT273DWG4 DW | SOIC 20 25 507 12.83 5080 6.6 | |||||||
| SN74HCT273N | N | PDIP | 20 | 20 | 506 | 13.97 | 11230 | 4.32 |
| SN74HCT273PW PW | TSSOP 20 70 530 | 10.2 3600 | 3.5 | |||||
| SN74HCT273PWE4 | PW | TSSOP | 20 | 70 | 530 | 10.2 | 3600 | 3.5 |
SMALL OUTLINE PACKAGE

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A 8.2 7.4 TYP PIN 1 INDEX AREA 1 20 18X 0.65 7.5 6.9 NOTE 3 2X 5.85 10 11 20X 0.38 0.22 B 5.6 5.0 NOTE 4 ⊕ 0.1@ A B
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C 0.1 C SEATING PLANE
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SEE DETAIL A (0.15) TYP
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GAGE PLANE 0.25 0° -8° 0.95 0.55 2 MAX 0.05 MINDETAIL A TYPICAL
4214851/B 08/2019
NOTES:
- All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M.
- This drawing is subject to change without notice.
- This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not exceed 0.15 mm per side.
- This dimension does not include interlead flash. Interlead flash shall not exceed 0.25 mm per side.
- Reference JEDEC registration MO-150.
SMALL OUTLINE PACKAGE

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20X (1.85) SYMM (0.45) 1 20X 18X (0.65) 10 (7) R0.05 TYP 20 SYMM 11LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE: 10X

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SOLDER MASK OPENING METAL EXPOSED METAL 0.07 MAX ALL AROUNDNON-SOLDER MASK DEFINED (PREFERRED)

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METAL UNDER SOLDER MASK SOLDER MASK OPENING EXPOSED METAL 0.07 MIN ALL AROUNDSOLDER MASK DETAILS
4214851/B 08/2019
NOTES: (continued)
- Publication IPC-7351 may have alternate designs.
- Solder mask tolerances between and around signal pads can vary based on board fabrication site.
SMALL OUTLINE PACKAGE

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20X (1.85) 1 20X (0.45) SYMM (7) 18X (0.65) 10 (R0.05) TYP 20 SYMM 11SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE: 10X
4214851/B 08/2019
NOTES: (continued)
- Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations.
- Board assembly site may have different recommendations for stencil design.
MECHANICAL DATA
NS (R-PDSO-G\*\*)
PLASTIC SMALL-OUTLINE PACKAGE
14-PINS SHOWN

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1,27 14 0,51 0,35 Ø 0,25① 8 5,60 5,00 8,20 7,40 1 7 A
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0,15 NOM Gage Plane 0,25 0°-10° 1,05 0,55
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2,00 MAX 0,15 0,05
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Seating Plane 0.10| DIM\PINS ** | 14 | 16 | 20 | 24 |
| A MAX | 10,50 | 10,50 | 12,90 | 15,30 |
| A MIN | 9,90 | 9,90 | 12,30 | 14,70 |
4040062/C 03/03
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion, not to exceed 0,15.
N (R-PDIP-T\*\*)
16 PINS SHOWN
PLASTIC DUAL-IN-LINE PACKAGE

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A 16 9 0.260 (6,60) 0.240 (6,10) 1 8 0.070 (1,78) 0.045 (1,14)C
| DIM\PINS ** | 14 | 16 | 18 | 20 |
| A MAX | 0.775(19,69) | 0.775(19,69) | 0.920(23,37) | 1.060(26,92) |
| A MIN | 0.745(18,92) | 0.745(18,92) | 0.850(21,59) | 0.940(23,88) |
| MS-001VARIATION | AA | BB | AC | AD |

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0.045 (1,14) 0.030 (0,76) D 0.020 (0,51) MIN 0.200 (5,08) MAX Seating Plane 0.125 (3,18) MIN 0.100 (2,54) 0.021 (0,53) 0.015 (0,38) ⊕ 0.010 (0,25) M 14/18 Pin Only 20 Pin vendor opt
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0.325 (8,26) 0.300 (7,62) 0.015 (0,38) Gauge Plane 0.010 (0,25) NOM 0.430 (10,92) MAX4040049/E 12/2002
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C Falls within JEDEC MS-001, except 18 and 20 pin minimum body length (Dim A).
The 20 pin end lead shoulder width is a vendor option, either half or full width.
SOIC

4220724/A 05/2016
NOTES:
- All linear dimensions are in millimeters. Dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M.
- This drawing is subject to change without notice.
- This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not exceed 0.15 mm per side.
- This dimension does not include interlead flash. Interlead flash shall not exceed 0.43 mm per side.
- Reference JEDEC registration MS-013.
SOIC

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20X (2) 1 20X (0.6) 18X (1.27) (R0.05) TYP 10 SYMM 20 SYMM 11 (9.3)LAND PATTERN EXAMPLE SCALE:6X

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SOLDER MASK OPENING METAL 0.07 MAX ALL AROUNDNON SOLDER MASK DEFINED

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METAL UNDER SOLDER MASK SOLDER MASK OPENING 0.07 MIN ALL AROUNDSOLDER MASK
DEFINED
SOLDER MASK DETAILS
4220724/A 05/2016
NOTES: (continued)
- Publication IPC-7351 may have alternate designs.
- Solder mask tolerances between and around signal pads can vary based on board fabrication site.
SOIC

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20X (2) 1 20X (0.6) 18X (1.27) SYMM 20 SYMM 10 (9.3) 11SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE:6X
4220724/A 05/2016
NOTES: (continued)
- Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations.
- Board assembly site may have different recommendations for stencil design.
SMALL OUTLINE PACKAGE

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A 6.6 TYP 6.2 PIN 1 INDEX AREA 1 20 18X 0.65 6.6 6.4 NOTE 3 2X 5.85 10 11 20X 0.30 0.19 B 4.5 4.3 NOTE 4 ⊕ 0.1@ A B
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C SEATING PLANE 0.1 C 1.2 MAX
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SEE DETAIL A (0.15) TYP
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GAGE PLANE 0.25 0.15 0.05 0°-8° 0.75 0.50 DETAIL A TYPICAL4220206/A 02/2017
NOTES:
- All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M.
- This drawing is subject to change without notice.
- This dimension does not include mold flash, protrusions, or gate burrs. Mold flash, protrusions, or gate burrs shall not exceed 0.15 mm per side.
- This dimension does not include interlead flash. Interlead flash shall not exceed 0.25 mm per side.
- Reference JEDEC registration MO-153.
SMALL OUTLINE PACKAGE

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20X (1.5) 1 20X (0.45) 18X (0.65) 10 (5.8) SYMM (R0.05) TYP 20 SYMM 11LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE: 10X

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SOLDER MASK OPENING METAL EXPOSED METAL 0.05 MAX ALL AROUNDNON-SOLDER MASK DEFINED (PREFERRED)

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METAL UNDER SOLDER MASK SOLDER MASK OPENING EXPOSED METAL 0.05 MIN ALL AROUNDSOLDER MASK DETAILS
4220206/A 02/2017
NOTES: (continued)
- Publication IPC-7351 may have alternate designs.
- Solder mask tolerances between and around signal pads can vary based on board fabrication site.
SMALL OUTLINE PACKAGE

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20X (1.5) 1 20X (0.45) SYMM (R0.05) TYP 20 18X (0.65) SYMM 10 (5.8) 11SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE: 10X
4220206/A 02/2017
NOTES: (continued)
- Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations.
- Board assembly site may have different recommendations for stencil design.
PW (R-PDSO-G20)
Example Board Layout

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18x0,65 5,6 Example Non Soldermask Defined Pad Example Solder Mask Opening (See Note E) 0,3 1,6 0,07 Pad Geometry All AroundBased on a stencil thickness of .127mm (.005inch).

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20x0,25 1,55 5,6 18x0,654211284-5/G 08/15
NOTES:
A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Publication IPC-7351 is recommended for alternate design.
D. Laser cutting apertures with trapezoidal walls and also rounding corners will offer better paste release. Customers should contact their board assembly site for stencil design recommendations. Refer to IPC-7525 for other stencil recommendations.
E. Customers should contact their board fabrication site for solder mask tolerances between and around signal pads.
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