IS281K

Overview

The IS281K is a single-channel transistor output optoisolator manufactured by Isocom Components 2004 LTD. It provides electrical isolation with a rated voltage of 3750Vrms. The device features a DC input and a transistor output capable of handling a maximum output voltage of 80V and a continuous output current of 50mA per channel. Key electrical parameters include a typical forward voltage of 1.2V, a maximum DC forward current of 60mA, and a saturation voltage drop of 200mV. The current transfer ratio ranges from 50% to 600% at a forward current of 10mA. Response times are specified as 5µs for rise time and 3µs for fall time. It operates within a temperature range of -55°C to 110°C and is available in a 4-SOIC surface mount package.

Feature Summary

• Provides high-voltage electrical isolation between input and output circuits
• Utilizes a transistor output configuration for digital signal switching
• Designed for surface mount assembly in compact electronic layouts

Applications

• Industrial control systems requiring circuit isolation
• Power supply protection and monitoring circuits
• Smart metering and utility instrumentation

Procurement Notes

Verify the specific suffix against official manufacturer documentation to confirm exact performance characteristics, as variations may exist within the product family. Ensure compatibility with standard surface mount reflow soldering profiles. Confirm RoHS compliance status and moisture sensitivity level requirements for your specific manufacturing environment before finalizing procurement orders.

Selection Notes

Select this component when a single-channel transistor output isolator is required for moderate-speed digital applications. Consider the 3750Vrms isolation rating and the 50mA output current capability relative to load requirements. Evaluate the 4-SOIC package dimensions against PCB layout constraints. Compare the current transfer ratio specifications against the driving circuit capabilities to ensure reliable switching performance under expected operating conditions.

Part Context

Isocom Components 2004 LTD specializes in infrared optoelectronic devices, including optocouplers and photovoltaic switches. The company has over four decades of industry expertise, originating from historical operations dating back to the 1980s. Their product portfolio focuses on providing alternative solutions for common commercial optocoupler standards, often serving markets where original manufacturers have discontinued specific part numbers.

Replacement Considerations

Publicly confirmed substitute part numbers for the IS281K were not identified in the provided source material.