HMAA2705

Transistor, Photovoltaic Output Optoisolators Overview

The HMAA2705 is a transistor output optocoupler manufactured by onsemi, featuring a compact 4-pin Mini-Flat surface-mount package with a lead pitch of 2.54 mm. It integrates two gallium arsenide infrared emitting diodes connected in inverse parallel to drive a single silicon phototransistor, enabling AC input capability. Key electrical parameters include an isolation voltage of 3750 Vrms, a maximum collector-emitter voltage of 40 V, and a maximum collector current of 80 mA. The device supports a forward current of 50 mA with a typical forward voltage of 1.3 V. It operates within a temperature range of -40°C to +100°C and offers a Current Transfer Ratio ranging from 50% to 300%.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Dual inverse-parallel GaAs infrared LEDs enable direct AC signal input without external rectification.
• Compact 4-pin Mini-Flat SMD package design minimizes board space requirements.
• High insulation voltage rating ensures safe electrical isolation between input and output circuits.

Transistor, Photovoltaic Output Optoisolators Applications

• AC signal detection and isolation in industrial control systems.
• Interface circuits for microcontrollers requiring galvanic isolation.
• Power supply feedback loops for voltage regulation.

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify component status as the HMAA2705 is listed as obsolete or discontinued by the manufacturer. Confirm availability through authorized distributors or secondary markets if sourcing is required. Ensure that any replacement components meet the same pinout, electrical ratings, and safety certifications to maintain system integrity and compliance with original design specifications.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when AC input isolation is required in a compact form factor. The dual-diode configuration simplifies circuit design by eliminating the need for external bridge rectifiers. Consider the 50-300% CTR range for gain variations and ensure the 40V collector voltage meets load requirements. Verify thermal management capabilities within the specified operating temperature range for reliable long-term performance.

Transistor, Photovoltaic Output Optoisolators Part Context

The HMAA2705 belongs to the HMAA2705 series of 4-pin full-pitch optocouplers. It shares architectural similarities with the HMA121 and HMA2701 series but distinguishes itself through the inclusion of dual input LEDs for AC compatibility. This series is designed for applications demanding high isolation reliability in small surface-mount packages.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

The FODM2705R2 is identified as a potential substitute part number. Verify compatibility regarding pin configuration, electrical characteristics, and packaging before implementation.

Transistor, Photovoltaic Output Optoisolators FAQ

How does the HMAA2705 handle AC input signals?

It utilizes two gallium arsenide infrared LEDs connected in inverse parallel, allowing it to respond to both positive and negative half-cycles of an AC input signal directly.

What is the maximum isolation voltage of the HMAA2705?

The device provides an isolation voltage of 3750 Vrms, suitable for safe electrical insulation applications per relevant standards.