HCPL4502SD

Transistor, Photovoltaic Output Optoisolators Overview

The HCPL4502SD is a single-channel high-speed transistor output optocoupler manufactured by Fairchild Semiconductor. It features a diode-transistor architecture with separate photodiode bias and output-transistor collector connections, enabling data rates up to 1 MBps. The device provides electrical isolation between input and output circuits. Key electrical parameters include a maximum forward current of 25 mA, a minimum current transfer ratio (CTR) of 15%, and a maximum forward voltage of 1.95 V. The unit supports surface mount installation in an 8-SMD widebody DIP-8 package.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• High common mode transient immunity for reliable signal transmission in noisy environments
• Integrated photodetector design reduces base-collector capacitance to achieve high speed
• TTL compatible logic interface for direct connection to digital systems

Transistor, Photovoltaic Output Optoisolators Applications

• High speed logic ground isolation for TTL and CMOS interfaces
• Line receivers requiring high common mode transient immunity
• Replacement for pulse transformers to reduce board space and weight

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or its successors, noting that Agilent and Broadcom also produced this family. Confirm the specific suffix 'SD' corresponds to the surface mount widebody DIP-8 package. Check RoHS compliance status, as original versions may not be compliant while newer variants might be. Ensure the component matches the single-channel configuration and 1 MBps speed rating specified in official datasheets.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when high speed isolation is required alongside small footprint constraints. The separate photodiode bias terminal allows for optimized speed performance compared to standard phototransistor couplers. Consider the 8-pin surface mount package for automated assembly processes. Verify that the 1 MBps data rate meets the system timing requirements and that the isolation voltage rating satisfies safety standards.

Transistor, Photovoltaic Output Optoisolators Part Context

This device belongs to the HCPL-450x series of single-channel high-speed optocouplers. It shares architectural similarities with the HCPL-4503 but differs in pinout and packaging options. The series was originally developed by Hewlett-Packard and later produced by Agilent, Broadcom, and Fairchild Semiconductor. The technology utilizes a GaAsP LED coupled to an integrated photodetector circuit.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

• HCPL-4502
• HCPL-4502V
• HCPL-4502SV