IS357D

Overview

The IS357D is a high-density surface-mount optocoupler featuring a single channel with transistor output. It integrates an infrared light-emitting diode and an NPN silicon phototransistor within a compact Mini-Flat-4 package. The device provides an insulation voltage of 3750Vrms, ensuring robust signal isolation between input and output circuits. Designed for efficient space-constrained applications, it supports a collector current of 50 mA and offers a minimum current transfer ratio of 300%. This component is supplied in tape and reel packaging to facilitate automated assembly processes.

Feature Summary

• Integrates an infrared LED with an NPN silicon phototransistor for reliable optical coupling
• Provides high-voltage electrical isolation via 3750Vrms insulation rating
• Utilizes a compact Mini-Flat-4 surface-mount package for high-density board mounting

Applications

• Signal isolation in industrial control systems
• Interface circuits for microprocessor-based logic systems
• Power supply feedback loops requiring galvanic isolation

Procurement Notes

Verify the specific suffix 'D' corresponds to the tape and reel configuration when ordering. Confirm that the Mini-Flat-4 footprint matches the target PCB design. Ensure the required insulation voltage and current transfer ratio meet the system's isolation specifications before finalizing procurement.

Selection Notes

Select this component when a small form factor is critical alongside standard transistor output characteristics. Consider the 300% CTR for driving subsequent logic stages without additional amplification. Evaluate the 3750Vrms rating against the system's safety isolation requirements to ensure compliance with relevant standards.

Part Context

Isocom Components specializes in high-performance infrared optoelectronic devices, including optocouplers and optoswitches. The IS357D belongs to their range of surface-mount isolators designed for space-efficient electronic designs. The manufacturer focuses on providing reliable components for various industrial and commercial applications.

Replacement Considerations

Check datasheets for alternative 1-channel transistor output optocouplers in Mini-Flat-4 packages. Verify matching insulation voltage (3750Vrms) and current transfer ratio (minimum 300%) to ensure functional equivalence. Confirm pinout compatibility to avoid redesigning the printed circuit board layout.