PS2702-1-A

Overview

The PS2702-1-A is a single-channel optically coupled isolator manufactured by California Eastern Laboratories (CEL). It integrates a Gallium Arsenide (GaAs) infrared light-emitting diode with an NPN silicon Darlington-connected phototransistor. The device provides high isolation voltage of 3750Vrms and supports a maximum collector current of 200 mA. Key electrical parameters include a maximum collector-emitter voltage of 40 V and a minimum Current Transfer Ratio (CTR) of 200% at 1 mA forward current. It is housed in a lead-free, thin plastic SOP-4 package.

Feature Summary

• Integrates GaAs LED with NPN silicon Darlington phototransistor for high gain
• Provides high isolation voltage of 3750Vrms for surge protection
• Supports maximum collector current of 200 mA
• Available in lead-free thin plastic SOP-4 package

Applications

• Digital telecommunications systems
• Medical equipment signal isolation
• Industrial control system interfaces
• Audio equipment circuit isolation

Procurement Notes

Verify the specific suffix (e.g., -F3-A, -V-F4-A) against the required packaging or processing specifications, as these denote physical variations rather than functional changes. Confirm product status, as some variants like PS2702-1-A are discontinued. Ensure compliance with RoHS directives if lead-free construction is mandatory for the assembly process.

Selection Notes

Select this component when high CTR and robust isolation are required for low-to-medium speed switching applications. The Darlington configuration offers higher sensitivity compared to standard phototransistors. Verify that the 40 V collector-emitter voltage rating meets the load requirements. Consider package dimensions and thermal characteristics for PCB layout integration.

Part Context

The PS2702-1 series belongs to CEL's family of high isolation voltage Darlington transistor optocouplers. These devices are designed for reliable signal transmission across isolated barriers in noisy environments. The series typically includes various suffixes indicating different tape-and-reel options or lead-free certifications, maintaining consistent electrical performance across variants.

Replacement Considerations

Direct substitutes may include other single-channel Darlington optocouplers with similar isolation ratings and pinouts. Verify compatibility with existing PCB footprints and ensure equivalent CTR and isolation voltage specifications are met before substitution.