HMHA281R4V

Transistor, Photovoltaic Output Optoisolators Overview

The onsemi HMHA281R4V is a single-channel transistor output optocoupler housed in a compact SMD-4 Mini-Flat package. It features an NPN phototransistor output with a maximum collector-emitter voltage of 80 V and a continuous collector current of 50 mA. The device provides high isolation capability with an insulation voltage of 3750 Vrms. Key electrical parameters include a forward current of 50 mA, a forward voltage of 1.3 V, and a reverse voltage rating of 6 V. The current transfer ratio ranges from 50% to 600%, with typical rise and fall times of 3 μs. Power dissipation is rated at 210 mW, and the unit operates within a temperature range of -55°C to +100°C.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Compact four-pin Mini-Flat surface-mount package designed for space-constrained PCB layouts
• High isolation voltage rating of 3750 Vrms for robust signal transmission across isolated domains
• Wide current transfer ratio range supporting diverse logic interface requirements
• Fast switching performance with typical rise and fall times of 3 microseconds

Transistor, Photovoltaic Output Optoisolators Applications

• General-purpose digital signal isolation in industrial control systems
• Interface circuits between microcontrollers and power switching devices
• Signal transmission in communication equipment requiring galvanic isolation
• Power supply feedback loops for voltage regulation and monitoring

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify component authenticity through authorized distribution channels due to discontinuation status. Confirm specific suffix variations against official datasheets as packaging or minor parameter differences may exist between reel and tube configurations. Ensure compliance with RoHS directives and relevant safety certifications such as UL, EN, and IEC standards before integration into final assemblies.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when high isolation voltage and compact footprint are critical design constraints. The wide CTR range allows flexibility in drive circuit design without requiring precise resistor calculations for all operating conditions. Consider thermal management capabilities given the 210 mW power dissipation limit in dense board layouts. Evaluate replacement options if long-term supply stability is required for production runs.

Transistor, Photovoltaic Output Optoisolators Part Context

This device belongs to the HMHA series of miniature flat optocouplers manufactured by onsemi. The series emphasizes small form factor solutions for modern electronics while maintaining high reliability standards. The HMHA281 variant specifically targets applications needing moderate speed and high isolation in a minimal footprint. It represents a transition toward smaller packages compared to traditional DIP optocouplers.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

HMHA281R2 serves as a direct functional substitute within the same product family. Verify pinout compatibility and package dimensions before substitution. Check if alternative sourcing channels offer availability since the original part number indicates discontinuation status.