CNY74-4 - Electronic component VELLEMAN - Free user manual and instructions
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| Type of product | Phototransistor optocoupler |
| Brand | Velleman |
| Model | CNY74-4 |
| Category | Electronic component |
| Package | DIP-4 |
| Number of channels | 1 |
| Input type | Infrared LED |
| Output type | Phototransistor |
| Isolation voltage | 5000 Vrms |
| Current transfer ratio (CTR) | 160-320% |
| Maximum collector-emitter voltage | 70 Vdc |
| Maximum collector current | 50 mA |
| LED forward voltage (typical) | 1.25 V |
| LED forward current (max) | 60 mA |
| Power dissipation (total) | 260 mW |
| Operating temperature range | -40°C to +100°C |
| Dimensions (approx.) | 7.6 x 6.5 x 3.5 mm |
| Weight | 0.3 g |
| Main function | Electrical isolation and signal transfer |
| Maintenance | None required; keep leads clean |
| Cleaning | Use isopropyl alcohol or dry cloth |
| Safety precautions | Mind polarity and do not exceed maximum ratings |
| Spare parts and reparability | Not repairable; replace component if defective |
| General information | RoHS compliant and lead-free |
Frequently Asked Questions - CNY74-4 VELLEMAN
What is the Velleman CNY74-4?
The CNY74-4 is a phototransistor optocoupler that uses an infrared LED and a phototransistor to provide electrical isolation between input and output circuits.
What is the current transfer ratio (CTR) of the CNY74-4?
The CTR is typically between 160% and 320% at a specified forward current, meaning the output collector current can be up to 3.2 times the input LED current.
What isolation voltage does the CNY74-4 provide?
It provides 5000 Vrms of electrical isolation, making it suitable for safety applications where signal separation is critical.
How do I test a CNY74-4 optocoupler?
Use a multimeter in diode test mode on the LED pins (typically pins 1 and 2) to check the forward voltage. For the phototransistor, connect an ohmmeter between collector and emitter and apply current to the LED; the resistance should change accordingly.
What are the maximum voltage and current ratings?
The maximum collector-emitter voltage is 70 Vdc, the maximum collector current is 50 mA, and the LED forward current should not exceed 60 mA.
Can I replace a CNY74-4 with another optocoupler?
Yes, you can substitute with an optocoupler that has similar package and CTR, such as CNY74-3 or CNY17-4, but always verify the pinout and isolation rating.
What are common applications of the CNY74-4?
Common uses include signal isolation, power supply feedback, MOSFET/IGBT gate drivers, and microcontroller interfacing with high-voltage circuits.
What are the soldering and handling precautions?
Avoid bending leads too close to the body. Solder at a temperature below 260°C for less than 10 seconds. Use ESD precautions to protect the sensitive LED.
What is the operating temperature range?
The CNY74-4 operates from -40°C to +100°C, making it suitable for industrial environments with temperature extremes.
Does the CNY74-4 need external components?
Typically, you need a current-limiting resistor for the LED and a pull-up resistor or load resistor on the output, depending on your application.
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USER MANUAL CNY74-4 VELLEMAN
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Product information
Brand : VELLEMAN
Model : CNY74-4
Category : Electronic component