ISP817XD

Overview

The Isocom Components ISP817XD is a single-channel phototransistor output optocoupler designed for through-hole mounting in a standard DIP-4 package. It provides electrical isolation between input and output circuits using an infrared LED coupled to an NPN silicon phototransistor. The device features a high current transfer ratio range of 100% to 600%, ensuring reliable signal transmission across varying temperature conditions. Key electrical specifications include a maximum forward voltage of 1.4V, a peak reverse voltage of 5V for the LED, and a collector-emitter breakdown voltage of 30V. The unit supports a maximum input current of 50mA and offers an isolation voltage of 5300Vrms. Operating temperatures span from -55°C to +100°C, with typical rise and fall times of 4µs and 3µs respectively.

Feature Summary

• Provides galvanic isolation via infrared light coupling between input LED and output phototransistor
• High current transfer ratio ensures consistent switching performance across wide temperature ranges
• Robust insulation capability rated at 5300Vrms for safe operation in high-voltage environments

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops for voltage regulation
• Solid-state relay driver circuits

Procurement Notes

Verify that the specific suffix 'XD' corresponds to the intended lead frame plating and tape-and-reel or tube packaging configuration as defined by Isocom Components. Confirm compliance with RoHS directives and UL/VDE safety standards required for the target application region. Ensure the ordering part number matches the exact pinout and mechanical dimensions specified in the official datasheet to prevent PCB footprint mismatches during assembly.

Selection Notes

Select this component when a high-density, single-channel isolation solution is needed with a broad current transfer ratio tolerance. The DIP-4 package facilitates easy prototyping and manual assembly compared to surface-mount alternatives. Consider the 5300Vrms isolation rating for applications involving significant potential differences between control and power sides. Evaluate the 4µs/3µs switching speeds against system timing requirements to ensure adequate response rates for the intended frequency domain.

Part Context

The ISP817XD belongs to the ISP817 series of phototransistor optocouplers manufactured by Isocom Components. This series is engineered as a drop-in replacement for legacy industry-standard devices, offering comparable pinouts and electrical characteristics while providing enhanced parameter selection flexibility. The component utilizes standard plastic encapsulation and through-hole technology, aligning with common commercial optocoupler form factors used in general-purpose electronic design.

Replacement Considerations

Public confirmed substitute part numbers: CNY17F-1XG, ISD74X, ISP814X, ISP817BLSM, ISP817DXSM, ISP847GBX, ISP817B.