PS2561A-1-A

Overview

The PS2561A-1-A is a single-channel transistor output optocoupler manufactured by CEL (Renesas). It integrates a Gallium Arsenide (GaAs) infrared emitting diode and an NPN silicon phototransistor within a plastic DIP-4 package. The device provides high isolation voltage of 5000 Vrms between input and output. Key electrical parameters include a minimum collector-emitter breakdown voltage of 70 V, a maximum forward current of 30 mA, and a nominal current transfer ratio of 50%. It operates within a temperature range of -55 °C to +100 °C and features low dark current.

Feature Summary

• High isolation voltage capability for safe signal transmission across isolated circuits
• Integration of GaAs LED and NPN phototransistor for efficient optical coupling
• Compliance with international safety standards including UL, CSA, and BSI approvals

Applications

• Industrial control systems requiring galvanic isolation
• Power supply feedback loops for voltage regulation
• Signal transmission in noisy electromagnetic environments

Procurement Notes

Verify the manufacturer designation as CEL or Renesas, as production rights may have transferred. Confirm the specific suffix 'A' corresponds to the standard DIP-4 package configuration. Ensure compliance requirements such as lead-free status and RoHS directives are explicitly stated in the final datasheet provided by the supplier. Cross-reference the part number against official Renesas or CEL catalogs to confirm current production status and availability.

Selection Notes

Select this component when a single-channel isolation barrier is required with moderate current transfer characteristics. The 70 V collector-emitter breakdown voltage suits low-voltage switching applications. Consider the DIP-4 package for through-hole mounting constraints. Verify that the 50% nominal CTR meets the drive requirements of the downstream circuitry under all operating temperature conditions.

Part Context

This component belongs to the PS2561 series of high isolation voltage photocouplers. The series includes variants with different packages such as surface mount L2 types and higher CTR BL versions. The PS2561A-1-A represents the standard through-hole DIP variant with baseline current transfer performance, widely used in general-purpose isolation tasks.

Replacement Considerations

Direct substitutes include PS2561A-1-E3-A for lead-free compliance updates. Surface mount equivalents are available in the PS2561AL2-1 series. Higher CTR options like the PS2561BL2-1 series offer improved gain but require verification of pinout and thermal compatibility.