HMA121C

Transistor, Photovoltaic Output Optoisolators Overview

The HMA121C is a single-channel transistor output optocoupler manufactured by onsemi. It features an NPN phototransistor output housed in a compact SMD-4 package. The device provides high isolation with a rated insulation voltage of 3750 Vrms. Key electrical parameters include a maximum collector-emitter voltage of 80 V and a maximum collector current of 80 mA. The forward voltage is specified at 1.3 V with a maximum forward current of 50 mA. Power dissipation is limited to 150 mW, and the unit operates within a temperature range of -40°C to +100°C.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides galvanic isolation between input and output circuits using an infrared LED and NPN phototransistor pair.
• Designed for surface-mount assembly in a small four-pin SMD footprint to support automated PCB manufacturing.
• Ensures signal integrity across isolated domains through high dielectric strength insulation.

Transistor, Photovoltaic Output Optoisolators Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops
• Communication interface isolation

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify component authenticity due to obsolete status. Check datasheet revisions for parameter updates. Confirm RoHS compliance documentation availability. Validate pinout compatibility during integration. Source from authorized distributors to ensure quality assurance.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Evaluate CTR requirements against application needs. Ensure voltage ratings match circuit specifications. Consider thermal management for power dissipation limits. Verify package compatibility with existing footprints. Assess operating temperature range suitability.

Transistor, Photovoltaic Output Optoisolators Part Context

This component belongs to the HMA121 series of transistor output optocouplers. It shares core specifications with variants like HMA121E and HMA121AR3. Differences typically involve packaging formats or specific binning criteria. The series supports general-purpose isolation tasks in industrial and commercial electronics.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

HMA121E and HMA121AR3 are related parts within the same family. Verify functional equivalence before substitution. Check for any differences in current transfer ratio bins or packaging types. Ensure pinout compatibility remains consistent across variants.