HMHA281R1

Transistor, Photovoltaic Output Optoisolators Overview

The onsemi HMHA281R1 is a single-channel phototransistor output optocoupler designed for surface-mount applications. It features a 4-pin Mini-Flat (MFP) package with a half-pitch configuration. The device provides an isolation voltage of 3750Vrms and supports a maximum forward current of 50mA with a typical forward voltage of 1.3V. The collector-emitter saturation voltage is specified at a maximum of 400mV, while the collector-emitter breakdown voltage reaches 80V. Current transfer ratios range from 50% to 600% at 5mA input. Typical rise and fall times are both 3µs, ensuring fast switching performance within an operating temperature range of -55°C to 100°C.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• High isolation voltage capability of 3750Vrms for robust signal transmission across potential barriers.
• Compact 4-pin Mini-Flat surface-mount package optimized for space-constrained PCB layouts.
• Fast switching characteristics with typical rise and fall times of 3µs for efficient data transfer.
• Wide operating temperature range extending from -55°C to 100°C for reliable industrial performance.

Transistor, Photovoltaic Output Optoisolators Applications

• Industrial automation control systems requiring galvanic isolation.
• Signal interface circuits in communication equipment.
• Power supply feedback loops for voltage regulation.
• Microcontroller input/output isolation interfaces.

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific suffix R1 against official datasheets to confirm tape-and-reel packaging specifications. Ensure compatibility with standard reflow soldering profiles for Mini-Flat packages. Cross-reference RoHS compliance status with the latest manufacturer declarations. Confirm availability as some variants may have limited stock or end-of-life statuses. Validate pinout alignment with design schematics prior to procurement.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when high isolation voltage and compact form factor are critical. The 3750Vrms rating suits applications demanding strong noise immunity. Consider the 3µs switching speed for moderate-frequency digital signals. Evaluate the 50mA collector current limit against load requirements. Compare thermal dissipation capabilities within the Mini-Flat package for dense assemblies.

Transistor, Photovoltaic Output Optoisolators Part Context

The HMHA281R1 belongs to the HMHA series of phototransistor optocouplers manufactured by onsemi. This series emphasizes miniaturization through the use of the 4-Mini-Flat package, which reduces footprint compared to traditional DIP packages. The device integrates an infrared emitting diode and a silicon phototransistor on a single chip, providing electrical isolation without magnetic interference.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

HMHA281R2 and HMHA281R3 are documented variants within the same family, differing primarily in packaging format such as bulk tube versus tape-and-reel. Verify pinout compatibility before substitution. Check if specific suffixes indicate changes in insulation class or testing standards.