HCPL3700S

Transistor, Photovoltaic Output Optoisolators Overview

The HCPL3700S is a single-channel AC/DC to Logic interface optocoupler manufactured by Fairchild Semiconductor. It integrates an AlGaAs LED with a threshold-sensing input buffer IC and a Darlington output transistor. The device provides electrical isolation between high-voltage AC/DC lines and low-voltage logic circuits. Key specifications include a maximum continuous output current of 30 mA, a propagation delay of up to 40 us, and an insulation voltage rating of 2500 Vrms. It operates within a temperature range of -40°C to +85°C and is housed in an 8-pin surface-mount DIP package.

Transistor, Photovoltaic Output Optoisolators Feature Summary

• Integrates a threshold-sensing input buffer for direct AC/DC signal detection without external comparators
• Features a Darlington configuration output stage capable of driving logic inputs directly
• Provides high-voltage isolation between input and output circuits via optical coupling

Transistor, Photovoltaic Output Optoisolators Applications

• Ring detection circuits in telecommunication equipment
• AC line monitoring and detection systems
• DC voltage level sensing interfaces
• Industrial control logic isolation

Transistor, Photovoltaic Output Optoisolators Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or its successor entities, noting that production status may vary due to corporate acquisitions. Confirm the specific suffix 'S' denotes the surface-mount DIP-8 package variant. Check for RoHS compliance documentation relevant to the manufacturing date code. Ensure the component matches the original Fairchild datasheet specifications rather than later rebranded versions from other manufacturers.

Transistor, Photovoltaic Output Optoisolators Selection Notes

Select this component when designing circuits requiring direct interfacing between AC/DC power lines and digital logic without additional threshold detection hardware. The integrated buffer simplifies design by eliminating external comparator components. Consider the 40 us propagation delay suitable for non-high-speed applications. Verify that the 2500 Vrms isolation rating meets the safety requirements of the target application environment.

Transistor, Photovoltaic Output Optoisolators Part Context

This part belongs to the HCPL3700 series of AC/DC to Logic interface optocouplers originally developed by Fairchild Semiconductor. The series is designed to simplify the interface between high-voltage power stages and low-voltage control logic. Similar parts in the family include through-hole variants like the HCPL-3700 and different packaging options such as the HCPL3700SDM.

Transistor, Photovoltaic Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.