IS354

Overview

The IS354 is an optically coupled isolator manufactured by Isocom Components. It consists of two infrared light-emitting diodes connected in reverse parallel, allowing for AC input voltage detection and optical coupling to an NPN silicon phototransistor. The device is housed in a space-efficient Mini Flat Package (DIP-4). Key electrical parameters include a maximum isolation voltage of 3750 V, a nominal current transfer ratio of 20%, and a collector-emitter breakdown voltage minimum of 35 V. It supports a maximum forward current of 0.05 A and operates within a temperature range of -30 °C to 100 °C.

Feature Summary

• AC input capability via dual reverse-parallel infrared LEDs
• High insulation voltage rating of 3750 V RMS
• Wide operating temperature range from -55°C to +100°C
• Lead-free and RoHS compliant construction

Applications

• AC mains voltage sensing circuits
• Industrial control signal isolation
• Power supply feedback loops

Procurement Notes

Verify the specific package code FPA1 and lead-free status against the latest manufacturer datasheet. Confirm UL file E91231 compliance requirements for your region. Ensure the operating temperature range meets your environmental specifications, as the component is rated for up to 100 °C.

Selection Notes

Select the IS354 when AC input isolation is required without additional rectification circuitry. The dual LED configuration simplifies design for AC signals. Verify that the 20% CTR and 35 V breakdown voltage meet the load requirements of the downstream NPN transistor interface.

Part Context

The IS354 belongs to the Isocom Components optocoupler family, specifically designed for compact isolation applications. It utilizes a Mini Flat Package to save board space compared to standard DIP packages while maintaining high isolation voltages suitable for industrial and consumer electronics.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.