HMHA281R4

Transistor, Photovoltaic Output Optoisolators Overview

The HMHA281R4 is a single-channel transistor output optocoupler from onsemi, designed for surface-mount applications. It features a 4-Mini-Flat package and provides an isolation voltage of 3750Vrms. The device utilizes a DC input with a maximum forward current of 50 mA and a typical forward voltage of 1.3 V. The NPN phototransistor output supports a maximum collector-emitter voltage of 80 V and a collector current of 50 mA. Key electrical parameters include a current transfer ratio ranging from 50% to 600%, a saturation voltage of 400 mV, and typical rise/fall times of 3 µs. It operates within a temperature range of -55°C to +100°C.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides high-voltage galvanic isolation between input and output circuits
• Features a compact surface-mount Mini-Flat package design
• Delivers fast switching performance with microsecond-level response times

Transistor, Photovoltaic Output Optoisolators Applications

• General-purpose signal isolation in industrial control systems
• Power supply feedback loops requiring reliable voltage separation
• Microcontroller interface circuits for noise immunity

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific suffix R4 indicates reel packaging configuration against official datasheets. Confirm RoHS compliance status and material declarations prior to integration. Ensure the 4-Mini-Flat footprint matches the target PCB layout dimensions. Validate that the 3750Vrms isolation rating meets system safety requirements. Check for any recent product change notices affecting assembly or sourcing.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when a compact form factor is required alongside standard transistor output characteristics. The 3750Vrms isolation level suits applications demanding robust noise rejection. Consider the 50 mA output current capability for driving low-impedance loads. Verify that the 80 V collector-emitter voltage exceeds the maximum circuit potential. Evaluate the thermal dissipation limits relative to the ambient operating environment.

Transistor, Photovoltaic Output Optoisolators Part Context

This part belongs to the HMHA series of surface-mount optocouplers manufactured by onsemi. The series is characterized by small footprints and high isolation voltages suitable for modern electronics. The HMHA281 variant specifically denotes the transistor output type within this lineup. The R4 suffix typically identifies the tape and reel packaging format for automated assembly processes.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

HMHA281R2 is listed as a potential substitute with similar specifications but different packaging.