HCPL3700

Transistor, Photovoltaic Output Optoisolators Overview

The HCPL3700 is a single-channel logic output optocoupler designed for AC/DC to logic interface applications. It integrates an AlGaAs LED with a threshold sensing input buffer IC and a Zener diode full-wave bridge rectifier. Key electrical parameters include a maximum propagation delay of 40,000 ns, an isolation voltage of 2500 Vrms (onsemi) or 3750 Vrms (Broadcom), and a continuous output current of 30 mA. The device operates within a temperature range of -40°C to +85°C depending on the manufacturer variant.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Integrates a Zener diode full-wave bridge rectifier at the input stage
• Features a hysteresis buffer and constant current source for signal conditioning
• Provides direct interface capability between AC/DC inputs and digital logic circuits

Transistor, Photovoltaic Output Optoisolators Applications

• AC/DC to Logic Interface Optocoupler
• Voltage and Current Threshold Detection
• Ring Detection Systems

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the specific manufacturer suffix when ordering, as Broadcom, onsemi, and Fairchild variants exhibit differences in insulation voltage ratings and operating temperature ranges. Confirm package type availability, as surface mount and through-hole versions exist. Check datasheet revisions to ensure compatibility with required isolation standards such as UL, EN, or DIN certifications.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select based on required isolation voltage; some variants support up to 5000 Vrms while others are rated for 2500 Vrms. Consider the operating temperature range, as industrial grades extend to -40°C compared to commercial grades starting at 0°C. Ensure the package style matches the PCB layout requirements, choosing between PDIP for through-hole or SMD options for automated assembly.

Transistor, Photovoltaic Output Optoisolators Part Context

This component belongs to the HCPL series of optocouplers, originally developed by Agilent/Hewlett-Packard and later manufactured by Fairchild Semiconductor, Broadcom, and onsemi. The series is characterized by its ability to handle AC/DC signals directly without external rectification components, simplifying circuit design for power monitoring and interface applications.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

HCPL-3700-000E

Transistor, Photovoltaic Output Optoisolators FAQ

What is the function of the internal Zener diode?

The internal Zener diode forms a full-wave bridge rectifier at the input, allowing the device to detect both AC and DC signals directly.

Does the HCPL3700 require external components for rectification?

No, the integrated Zener diode full-wave bridge rectifier eliminates the need for external rectification components.