TIL125 datasheet by Texas Instruments

TIL125 Frequently Asked Questions (FAQs)

• What is the maximum operating temperature range for the TIL125?
  The TIL125 can operate from -40°C to 100°C, but the maximum junction temperature is 125°C.
• How do I ensure reliable operation of the TIL125 in high-temperature environments?
  To ensure reliable operation, keep the junction temperature below 125°C, use a heat sink if necessary, and follow proper PCB design and layout guidelines to minimize thermal resistance.
• What is the recommended LED current for the TIL125?
  The recommended LED current is 10 mA to 20 mA, but it can be as low as 1 mA for some applications. However, increasing the LED current can improve the CTR (current transfer ratio) and reduce the response time.
• How do I choose the correct resistor value for the LED in the TIL125?
  Choose a resistor value that limits the LED current to the recommended value, taking into account the supply voltage and the LED's forward voltage drop (typically 1.2 V to 1.4 V).
• What is the minimum CTR (current transfer ratio) I can expect from the TIL125?
  The minimum CTR is 20% at IF = 10 mA, but it can be as high as 100% or more depending on the specific device and operating conditions.