PS2561-1-A

Overview

The PS2561-1-A is a single-channel transistor output optocoupler manufactured by CEL. It integrates a Gallium Arsenide (GaAs) infrared emitting diode and an NPN silicon phototransistor within a DIP-4 package. The device provides high isolation voltage of 5000 Vrms between input and output circuits. Key electrical parameters include a collector-emitter breakdown voltage of 80 V, maximum forward current of 80 mA, and a typical current transfer ratio ranging from 80% to 400%. The component supports through-hole mounting and operates within a temperature range suitable for industrial applications.

Feature Summary

• High isolation voltage capability for safe signal transmission across potential barriers
• Integration of GaAs LED with NPN phototransistor for efficient optical coupling
• Single channel configuration designed for compact circuit layouts

Applications

• Industrial control systems requiring galvanic isolation
• Power supply feedback loops for voltage regulation
• Signal interfacing between microcontrollers and high-voltage loads

Procurement Notes

Verify the specific manufacturer designation as CEL or Renesas/NEC equivalents, as part numbers in this series are shared across multiple vendors. Confirm that the DIP-4 package matches the required footprint. Check RoHS compliance status if lead-free assembly is mandatory. Ensure the current transfer ratio specifications meet the design requirements for the intended logic levels. Validate that the component availability aligns with project timelines given its classification.

Selection Notes

Select this component when a single-channel isolation barrier with moderate speed and high voltage tolerance is required. The DIP-4 package facilitates easy prototyping and through-hole assembly. Consider the current transfer ratio spread when designing base drive circuits to ensure reliable saturation. Verify thermal management needs based on the maximum forward current rating. Compare against surface-mount variants if space constraints dictate a different form factor.

Part Context

The PS2561-1-A belongs to the PS2561 series of high isolation voltage photocouplers. This family includes various packages such as DIP and surface-mount options like the AL2 variant. The series is characterized by the use of GaAs LEDs and silicon phototransistors to achieve robust electrical isolation. Multiple manufacturers produce equivalent parts under similar numbering schemes, necessitating careful cross-referencing of datasheets for pinout and parameter verification.

Replacement Considerations

Public confirmed substitute part numbers include PS2561A-1 and PS2561BL2-1-E3-A. When substituting, verify that the replacement maintains the same DIP-4 package and pin configuration. Ensure the new component meets or exceeds the 5000 Vrms isolation voltage requirement. Check that the collector-emitter breakdown voltage and current transfer ratio ranges are compatible with the existing circuit design.