IS281A

Overview

The IS281A is a single-channel optoisolator manufactured by Isocom Components 2004 LTD, featuring a phototransistor output. It provides an isolation voltage of 3750Vrms and operates within a temperature range of -55°C to 110°C. The device utilizes a 4-SOIC surface-mount package with a width of 4.40mm. Key electrical parameters include a maximum collector-emitter voltage of 80V, a DC forward current limit of 60mA, and a typical forward voltage of 1.2V. The output channel supports a maximum current of 50mA with a saturation voltage drop of up to 200mV. Current transfer ratios range from 50% to 600% at a 10mA input, with typical rise and fall times of 5µs and 3µs respectively.

Feature Summary

• Provides galvanic isolation between input and output circuits using infrared LED and phototransistor technology.
• Designed for surface-mount assembly in compact 4-SOIC packages to facilitate automated PCB manufacturing.
• Capable of operating reliably across extended industrial temperature ranges from -55°C to 110°C.

Applications

• Industrial control systems requiring signal isolation
• Power supply protection circuits
• Smart metering and utility instrumentation

Procurement Notes

Verify the specific suffix or variant against the manufacturer's official datasheet to ensure compatibility with required packaging options such as tape and reel or cut tape. Confirm that the component meets RoHS3 compliance standards if environmental regulations apply to the final assembly. Cross-reference the ordering code with authorized distributors to ensure authenticity and traceability of the Isocom Components 2004 LTD product.

Selection Notes

Select this component when a single-channel transistor output isolator is needed for low-speed digital signal transmission. Ensure the circuit design accommodates the specified 3750Vrms isolation rating and the 80V collector-emitter voltage limit. Consider the 4-SOIC footprint constraints during layout planning. Verify that the required current transfer ratio falls within the 50% to 600% specification range for the intended operating conditions.

Part Context

The IS281A belongs to the IS series of high-performance infrared optoelectronic devices produced by Isocom Components 2004 LTD. This manufacturer specializes in phototransistor output optocouplers and has a history dating back to the 1980s, originally evolving from Litronix operations. The company focuses on providing alternatives to discontinued components and standard commercial types, maintaining production facilities in the UK and Malaysia.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult official cross-reference guides or contact the manufacturer directly for verified equivalent components.