PC123B

Overview

The PC123B is a photovoltaic output optocoupler manufactured by Sharp Microelectronics. It features a single channel configuration housed in a standard 4-DIP package with a 0.300-inch (7.62mm) width. The device provides high isolation capability with an insulation voltage rating of 5000 Vrms, ensuring reliable signal transmission across isolated circuits. The output utilizes a photovoltaic cell structure, generating open-circuit voltage without requiring external bias current for the output side. This component is designed for applications demanding robust electrical isolation and low input drive requirements.

Feature Summary

• Photovoltaic output architecture generates open-circuit voltage
• High dielectric isolation strength rated at 5000 Vrms
• Single-channel configuration within a compact 4-pin DIP footprint

Applications

• Solid-state relay driver circuits
• Industrial control system isolation interfaces
• Measurement equipment signal isolation

Procurement Notes

Verify component authenticity carefully due to reported market prevalence of counterfeit units. Confirm end-of-life status with the manufacturer prior to design finalization. Ensure supply chain sources provide traceable documentation to mitigate quality risks associated with obsolete electronic components.

Selection Notes

Select this component when photovoltaic output characteristics are required rather than transistor switching. Evaluate thermal management needs as power dissipation limits apply. Verify that the 5000 Vrms isolation rating meets specific safety standards for the target application environment.

Part Context

This part belongs to Sharp Microelectronics' historical portfolio of optoelectronic isolation devices. The PC123 series established benchmarks for reliability in industrial environments. As an obsolete product, it represents legacy design solutions previously widely adopted in analog signal isolation tasks.

Replacement Considerations

Consult official Sharp Microelectronics documentation for verified substitute part numbers. Cross-reference pinout compatibility and isolation voltage ratings before implementing alternative components.