PC817 Phototransistor Optocoupler (Equivalent to EL817C-F)
Currently unavailable
No store has this product in stock right now. Prices below are the last ones we recorded.
Prices updated: 14 Oct 2026
Price history
Lowest daily price, last 90 days
Not enough price history yet.
About this product
PC817, equivalent to EL817C-F (grade C), is a phototransistor optocoupler in a DIP-4 package that electrically isolates an LED input from a transistor output. It is used to isolate microcontroller signals from mains or high-voltage sections, such as in switch-mode power supply feedback loops.
Specifications
- Type
- Phototransistor optocoupler
- Number of channels
- 1
- Isolation voltage
- 5000 Vrms
- Current transfer ratio (grade C)
- 200% to 400%
- Package
- DIP-4
Frequently asked questions
How do I drive the LED side?
Drive the input LED through a series current-limiting resistor. Typical LED currents are in the range of a few to about 20 mA; check the datasheet for the exact forward current and resistor value.
What does grade C mean in EL817C?
Grade C refers to the current transfer ratio range of about 200% to 400%. It indicates how much output current is produced per unit of LED input current, so higher grades give more output current for the same input.
