4N35-X016 - Vishay

4N35-X016 Frequently Asked Questions (FAQs)

• What is the maximum operating temperature range for the 4N35-X016?
  The 4N35-X016 can operate over a temperature range of -40°C to 100°C, but the maximum junction temperature is 125°C.
• How do I ensure reliable operation of the 4N35-X016 in high-temperature environments?
  To ensure reliable operation in high-temperature environments, it's essential to keep the junction temperature below 125°C. This can be achieved by providing adequate heat sinking, reducing the current through the device, and using a thermal interface material to improve heat transfer.
• What is the recommended LED current for the 4N35-X016?
  The recommended LED current for the 4N35-X016 is 10 mA to 20 mA. Operating the LED at higher currents can reduce its lifespan, while operating at lower currents may result in reduced CTR (current transfer ratio).
• How do I choose the correct resistor value for the LED current-limiting resistor?
  To choose the correct resistor value, you need to consider the supply voltage, the desired LED current, and the forward voltage drop of the LED. A general rule of thumb is to use a resistor value that limits the LED current to the recommended value while keeping the voltage drop across the resistor to a minimum.
• What is the minimum CTR (current transfer ratio) I can expect from the 4N35-X016?
  The minimum CTR for the 4N35-X016 is 100% at an LED current of 10 mA and a collector current of 1 mA. However, the actual CTR may vary depending on the specific device and operating conditions.