LIA136STR

Overview

The LIA136STR is a low voltage optically isolated error amplifier from IXYS Integrated Circuits Division, designed for precision feedback in power supply applications. It integrates a precision reference, error amplifier, and optocoupler into a single surface-mount package. The device operates with an input voltage as low as 1.6V over the temperature range of -40°C to +110°C. Key electrical characteristics include a reference voltage of 1.299V with ±1.5% accuracy across the operating temperature range and a current transfer ratio ranging from 500% to 2000%. The LIA136 variant specifically features reduced dark current at high temperatures and enhanced common mode transient immunity of 20V/ns compared to the LIA135.

Feature Summary

• Integrates precision shunt reference, error amplifier, and optocoupler in one package
• Operates down to 1.6V input voltage ensuring low voltage performance
• Reduced dark current at high temperatures for improved stability
• High common mode transient immunity of 20V/ns

Applications

• Low voltage power supply feedback loops
• Isolated power supply regulation circuits
• AC-to-DC converter feedback systems
• DC-to-DC converter control architectures

Procurement Notes

Verify the specific suffix STR indicates tape and reel packaging containing 1000 units per reel. Confirm the operational temperature range extends to +110°C for the LIA136 variant. Ensure design accounts for the exposed base pin on the LIA136 phototransistor which requires external biasing components for optimal high-temperature performance.

Selection Notes

Select the LIA136STR over the LIA135 when operation above 85°C is required due to its superior thermal handling and reduced dark current. Consider the 20V/ns common mode transient immunity if the application involves noisy switching environments. Verify that the 1.6V minimum operating voltage aligns with the lowest expected secondary output voltage in the design.

Part Context

The LIA136 is part of the LIA135/LIA136 family of low voltage optically isolated error amplifiers. It serves as a functional equivalent to a discrete 431 type precision shunt regulator combined with an optocoupler. The STR suffix denotes the surface mount version packaged in tape and reel format, distinguishing it from the DIP or tube-packed SMT variants within the same product line.

Replacement Considerations

No official substitute part numbers are confirmed in the source documentation.