SFH618A-4SM

Overview

The SFH618A-4SM is a single-channel optocoupler manufactured by Isocom Components 2004 LTD, featuring a surface-mount DIP package with four pins. It utilizes a transistor output configuration and accepts AC input current. Key electrical specifications include a maximum forward voltage of 1.5V, a maximum input current of 50 mA, and an isolation voltage of 5.3 kVrms (7500 V peak). The device exhibits a typical rise time of 4µs and a typical fall time of 3µs. The minimum current transfer ratio is 160%, while the maximum is 500%.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits using a transistor output structure.
• Designed for surface-mount assembly in a compact four-pin DIP format to facilitate automated PCB placement.
• Capable of handling AC input signals with specified low forward voltage requirements.

Applications

• Signal isolation in industrial control systems
• Interface circuits for microcontroller-based digital logic
• Power supply feedback loop isolation

Procurement Notes

Verify that the specific suffix 'SM' corresponds to the intended surface-mount variant rather than standard through-hole packaging. Confirm the manufacturer designation matches Isocom Components 2004 LTD to ensure component authenticity. Cross-reference the pinout diagram with the target PCB footprint to prevent orientation errors during assembly. Ensure storage conditions comply with moisture sensitivity levels if applicable.

Selection Notes

Select this component when surface-mount space constraints require a small form factor alongside moderate speed performance. The 5.3 kVrms isolation rating supports applications requiring robust barrier protection against high transient voltages. Consider the 160% minimum CTR for reliable switching in low-drive environments. Evaluate thermal dissipation capabilities within the enclosed SMD package for continuous operation scenarios.

Part Context

This part belongs to the SFH618A series of optocouplers from Isocom Components 2004 LTD. The series typically offers transistor outputs with varying isolation ratings and package types. The SFH618A-4SM specifically denotes the surface-mount version of the standard SFH618A-4, maintaining identical electrical characteristics while adapting the physical interface for modern PCB manufacturing techniques.

Replacement Considerations

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