FOD817300

Overview

The FOD817300 is a single-channel transistor output optocoupler manufactured by Fairchild Semiconductor. It features a gallium arsenide infrared LED coupled to an NPN phototransistor in a surface-mount MDIP-4 package. Key electrical parameters include a minimum collector-emitter breakdown voltage of 70 V, a maximum forward current of 50 mA, and a nominal current transfer ratio of 80%. The device provides high isolation capability with a maximum insulation voltage of 5000 Vrms.

Feature Summary

• High isolation voltage rating for safe signal transmission between isolated circuits
• Surface-mount MDIP-4 package design for compact board integration
• Standard NPN phototransistor output configuration for general switching applications

Applications

• General-purpose digital signal isolation
• Solid-state relay driver circuits
• Microcontroller interface isolation

Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or its successor onsemi, noting that inventory status varies by distributor. Confirm the specific suffix '300' indicates the surface-mount MDIP-4 variant rather than the through-hole DIP version. Ensure compliance with RoHS and lead-free standards as specified in the component documentation before finalizing procurement orders.

Selection Notes

Select this component when a surface-mount solution is required for standard transistor-output optocoupler functionality. The 5000 Vrms isolation rating suits applications requiring robust galvanic separation. Consider the 80% typical CTR and 70 V breakdown voltage for circuit design margins. Verify thermal management requirements for the surface-mount package during operation.

Part Context

This part belongs to the widely used 817 series of optocouplers, which are industry-standard components for basic isolation tasks. The FOD817300 specifically denotes the surface-mount (MDIP) variant of the classic FOD817, maintaining pin compatibility while adapting to modern PCB assembly techniques. It serves as a direct physical replacement for DIP versions where space constraints necessitate SMD packaging.

Replacement Considerations

Equivalent parts include SFH1617A-3X016, which offers similar 5000Vrms isolation and comparable current transfer ratio ranges. Other generic 817-series surface-mount optocouplers from various manufacturers may serve as functional substitutes if pinout and electrical ratings align.