HMA121ER1

Transistor, Photovoltaic Output Optoisolators Overview

The HMA121ER1 is a single-channel transistor output optocoupler manufactured by Fairchild Semiconductor. It features an NPN phototransistor output and utilizes a 4-SMD surface-mount package. Key electrical specifications include a maximum collector-emitter voltage of 80 V, a maximum collector current of 80 mA, and an isolation voltage of 3750 Vrms. The device operates with a forward current of 50 mA and has a typical current transfer ratio of 300%. Power dissipation is rated at 150 mW, with an operating temperature range from -40°C to +100°C.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Provides high-voltage isolation between input and output circuits via optical coupling.
• Features a compact four-terminal surface-mount design for automated assembly.
• Utilizes an NPN phototransistor output stage for digital signal transmission.

Transistor, Photovoltaic Output Optoisolators Applications

• General-purpose digital signal isolation in industrial control systems.
• Interface circuits for microcontrollers requiring galvanic separation.
• Power supply feedback loops for voltage regulation monitoring.

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the manufacturer origin carefully, as historical records indicate production by Fairchild Semiconductor, which was acquired by onsemi. Confirm the specific suffix 'R1' denotes the reel packaging variant if required for your assembly line. Check current availability status as this component may be classified as obsolete or discontinued depending on the distributor's inventory. Ensure RoHS compliance documentation matches the specific batch date code.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when a low-cost, single-channel isolation solution with moderate speed requirements is needed. The 80 V collector-emitter voltage rating suits most low-voltage logic interfaces. Consider the 4-SMD package constraints for PCB layout space. Compare against modern equivalents if long-term supply assurance is critical, given the corporate acquisition history affecting part numbering and availability.

Transistor, Photovoltaic Output Optoisolators Part Context

This device belongs to the family of mini-flat package optocouplers designed for cost-sensitive applications. It serves as a fundamental building block for electrical isolation in consumer and industrial electronics. The transition from through-hole to surface-mount formats like this SMD-4 variant supports higher density circuit board designs.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source data. Due to the acquisition of Fairchild Semiconductor by onsemi, verify if equivalent onsemi part numbers offer compatible pinouts and electrical characteristics before substitution.