FOD817C

Overview

The FOD817C is a single-channel transistor output optocoupler from onsemi, housed in a 4-pin MDIP package. It features an NPN phototransistor output with a collector-emitter voltage of 70V and maximum collector current of 50mA. The device provides 5000Vrms isolation voltage and operates within a temperature range of -55°C to +110°C. Typical rise and fall times are 18μs. The current transfer ratio ranges from 200% to 400%, with a maximum forward voltage of 1.4V at 50mA input.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Utilizes an NPN phototransistor for digital signal transmission
• Designed for through-hole mounting in standard DIP configurations

Applications

• General-purpose signal isolation in industrial control systems
• Switching power supply feedback loops
• Microcontroller interface isolation

Procurement Notes

Verify the specific suffix (e.g., W, S) against the datasheet to confirm packaging type, as these indicate tube or reel formats. Ensure the component meets required insulation standards such as UL or VDE for the intended application. Confirm that the current transfer ratio specifications align with circuit design requirements before finalizing procurement orders.

Selection Notes

Select this component when a robust, general-purpose optocoupler with high isolation voltage is required. The NPN output is suitable for standard switching applications. Consider the C grade's current transfer ratio if precise gain is necessary. Evaluate thermal management needs given the wide operating temperature range and power dissipation limits.

Part Context

The FOD817C belongs to the widely used 817 series of optocouplers, known for their reliability in basic isolation tasks. It serves as a standard solution for galvanic isolation in low-to-medium speed digital circuits. The part is commonly substituted by other generic 817 variants, though specific electrical parameters may vary slightly between manufacturers.

Replacement Considerations

Generic equivalents such as PC817C or EL817C may be considered, but verify pinout compatibility and exactCTR ranges. Ensure substitute parts meet the same 5000Vrms isolation rating and package dimensions.