HCPL-4503

Transistor, Photovoltaic Output Optoisolators Overview

The HCPL-4503 is a single-channel high-speed optocoupler featuring a diode-transistor architecture. It provides electrical insulation between input and output using an insulating layer. The device offers a data rate of 1 MB/s and an isolation voltage of 3750 Vrms. Key electrical parameters include a minimum current transfer ratio of 19% at 16 mA forward current, a maximum forward voltage of 1.8 V, and a maximum collector-emitter saturation voltage of 0.8 V. It operates within a temperature range of -55°C to 70°C.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• High-speed operation achieved through separate photodiode bias and output-transistor collector connections, reducing base-collector capacitance for speeds up to one hundred times that of conventional phototransistor couplers.
• Logic IC output configuration with open-collector transistor output, ensuring CMOS compatibility for direct interfacing with digital logic circuits.
• Robust electrical isolation provided by an insulating layer between the LED and integrated photodetector, supporting high-voltage transient immunity.

Transistor, Photovoltaic Output Optoisolators Applications

• High-speed digital signal isolation in industrial communication interfaces
• Isolation barriers in microprocessor-based control systems
• Signal transmission across noisy environments requiring high common-mode rejection

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific suffix code (e.g., #300, #060) to confirm package type and compliance status, as variants exist for surface mount or through-hole configurations. Confirm RoHS compliance requirements, as standard versions may not be lead-free while -xxxE options are available. Ensure the selected part matches the required operating temperature range and isolation voltage ratings for the target application safety standards.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when high data rates near 1 MB/s are required alongside strong galvanic isolation. The separate bias connection distinguishes it from standard phototransistor optocouplers, offering superior speed. Consider the PDIP-8 or SO-8 package availability based on PCB layout constraints. Verify that the 19% minimum CTR meets the drive requirements of the downstream logic circuit under worst-case temperature conditions.

Transistor, Photovoltaic Output Optoisolators Part Context

This device belongs to the HCPL series of single-channel high-speed optocouplers manufactured by Broadcom Limited. It shares architectural similarities with the HCPL-0452/0453 and HCNW4502/4503 families, utilizing the same diode-transistor technology. The series is designed for applications demanding fast switching speeds and reliable electrical isolation in compact packages.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Direct functional substitutes within the same family include HCPL-0453 and HCPL-4502. Cross-family replacements like HCNW4503 offer similar isolation but may differ in speed or package dimensions. Verify pinout compatibility and electrical parameter margins before substituting.