PS2533-1

Overview

The PS2533-1 is an optically coupled isolator manufactured by CEL (formerly NEC/Renesas). It integrates a Gallium Arsenide (GaAs) infrared emitting diode with an NPN silicon Darlington connected phototransistor. Key electrical specifications include a high collector-to-emitter voltage (VCEO) of 350 V minimum and a high isolation voltage (BV) of 5,000 Vrms. The device features a typical current transfer ratio (CTR) of 4,000% at IF=5mA, VCE=5V. It offers low collector-to-emitter saturation voltage and large collector power dissipation capabilities.

Feature Summary

• High collector-to-emitter voltage capability for robust switching applications
• High isolation voltage rating ensuring safe signal transmission across potential barriers
• High current transfer ratio providing significant output current from minimal input drive
• Darlington-connected phototransistor structure for enhanced sensitivity

Applications

• Industrial automation control systems
• Power supply feedback loops
• Solid-state relay drivers
• Microcomputer interface circuits

Procurement Notes

Verify the manufacturer designation carefully, as this component was originally produced by NEC and later transferred to Renesas Technology Corp, and subsequently acquired by CEL. Ensure the ordering part number matches the specific package variant required, such as standard DIP or BSI SMT configurations. Confirm that the datasheet version aligns with the current production status under the CEL brand to ensure accurate parameter validation during procurement.

Selection Notes

Select this component when high voltage isolation and high gain are critical requirements. The Darlington configuration provides superior current transfer compared to single phototransistors, making it suitable for driving loads directly without additional amplification stages. Consider the thermal management requirements due to the collector power dissipation characteristics. Verify that the input forward current limits are respected to maintain the specified current transfer ratio over the operating temperature range.

Part Context

This component belongs to the PS2533 family of optocouplers, which includes variants like PS2533-2 and PS2533-4 offering different pin configurations. The family is characterized by high isolation performance and is widely used in industrial environments requiring reliable galvanic isolation. The PS2533-1 specifically denotes the four-pin DIP or surface mount package variant within this series.

Replacement Considerations

Direct substitutes may include other high-voltage Darlington optocouplers from manufacturers such as Vishay or Broadcom, provided they meet the 350V VCEO and 5kV isolation requirements. Verify pin compatibility and current transfer ratio specifications before substitution. Note that while the brand has changed from NEC to CEL, the core device specifications remain consistent with the original Renesas documentation.