HCPL2531SM

Transistor, Photovoltaic Output Optoisolators Overview

The HCPL2531SM is a dual-channel high-speed transistor output optocoupler manufactured by Fairchild Semiconductor. It consists of an AlGaAs LED optically coupled to a high-speed photodetector transistor. The device features a separate connection for the bias of the photodiode, which improves speed significantly over conventional phototransistor optocouplers by reducing base-collector capacitance. It operates with a maximum data rate of 1 Mbit/s and provides superior common mode rejection of 10kV/µs due to an internal noise shield.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Dual-channel configuration with independent signal paths
• High-speed operation up to 1 Mbit/s via dedicated photodiode bias
• Internal noise shield for superior common mode rejection
• Enhanced package insulation supporting higher working voltages

Transistor, Photovoltaic Output Optoisolators Applications

• Line receivers
• Pulse transformer replacement
• Output interface to CMOS-LSTTL-TTL logic families
• Wide bandwidth analog coupling

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific suffix 'SM' indicates surface mount packaging distinct from through-hole variants like HCPL-2531. Confirm isolation voltage ratings and operating temperature ranges against the official datasheet, as these parameters vary across different manufacturers producing this part number. Ensure compliance with RoHS standards if required for the application environment.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when high-speed digital isolation is required in a compact surface-mount form factor. The dual-channel design allows for cost-effective isolation of multiple signals within a single package. Consider the 1 Mbit/s data rate limit and the need for external biasing circuits for optimal performance in high-frequency applications.

Transistor, Photovoltaic Output Optoisolators Part Context

This device belongs to the HCPL-2530/HCPL-2531 family of high-speed optocouplers. It shares architectural similarities with the HCPL-4502 and HCPL-2503 but offers dual-channel functionality. The series is designed to replace pulse transformers in digital communication interfaces, providing galvanic isolation between input and output circuits.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

HCPL-2531 (Through-Hole variant)

Transistor, Photovoltaic Output Optoisolators FAQ

How does the HCPL2531SM achieve high-speed performance?

It uses a separate connection for the bias of the photodiode, which reduces the base-collector capacitance of the input transistor, improving speed by several orders of magnitude compared to conventional designs.

What is the common mode rejection capability?

The device features an internal noise shield that provides superior common mode rejection of 10kV/µs.