HMA121R1

Transistor, Photovoltaic Output Optoisolators Overview

The HMA121R1 is a single-channel transistor output optocoupler manufactured by Fairchild Semiconductor, now part of onsemi. It features an NPN phototransistor output housed in a compact SMD-4 package designed for surface mount technology. The device provides electrical isolation with a rated insulation voltage of 3750 Vrms. Key electrical parameters include a maximum collector-emitter voltage of 80 V and a continuous forward current of 50 mA. The unit supports a wide operating temperature range from -40°C to +100°C and dissipates up to 150 mW of power.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Utilizes an NPN phototransistor for signal transmission
• Designed for surface mount assembly in compact footprints

Transistor, Photovoltaic Output Optoisolators Applications

• General purpose signal isolation
• Industrial control systems
• Consumer electronics interfaces

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific manufacturer source, as production has transitioned from Fairchild Semiconductor to onsemi. Confirm the lifecycle status, as some listings indicate discontinued or obsolete status while others may reflect remaining stock. Ensure the component matches the required RoHS compliance standards for your application. Check for valid datasheets corresponding to the specific revision before integration.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when a low-profile, single-channel isolation solution is required for space-constrained designs. The 80V collector-emitter rating suits low-voltage logic interfacing. Consider the thermal dissipation limits and operating temperature range relative to the host environment. Verify that the NPN output configuration aligns with the downstream circuit requirements.

Transistor, Photovoltaic Output Optoisolators Part Context

This component belongs to the HMA121 series of full pitch mini-flat package optocouplers. Originally produced by Fairchild Semiconductor, the product line was integrated into onsemi's portfolio following corporate acquisition. The series is characterized by its small form factor and reliable transistor output performance for basic isolation tasks.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Direct substitutes within the same family include HMA121CR4V and HMA121E. These variants share similar electrical characteristics but may differ in packaging quantity or specific current transfer ratio tolerances. Verify pinout compatibility and insulation ratings when cross-referencing.