INA105KU

Overview

The INA105KU is a precision unity-gain differential amplifier manufactured by Texas Instruments. It integrates laser-trimmed thin-film resistors to achieve high accuracy without external components. The device operates on a single supply voltage ranging from 10 V to 36 V, with a typical supply current of 1.5 mA. It features a bandwidth of 1 MHz and a slew rate of 3 V/µs. The input offset voltage is typically 50 µV, ensuring minimal error in signal conditioning applications. Packaged in an 8-SOIC case, it supports operation from -40°C to +85°C.

Feature Summary

• Integrated laser-trimmed thin-film resistor network for precise unity gain
• High common-mode rejection ratio for accurate differential signal amplification
• Single-supply operation capability simplifying power design
• Low input bias current minimizing loading effects on source circuits

Applications

• Sensor signal conditioning for bridge sensors
• Medical instrumentation requiring high accuracy
• Industrial process control systems
• Data acquisition front-ends
• Precision current sensing circuits

Procurement Notes

Verify the specific suffix KU against the official Texas Instruments datasheet to confirm package type and temperature range. Ensure compatibility with system voltage requirements before integration. Check for recent product change notifications regarding manufacturing site or material composition updates.

Selection Notes

Select this component when a fixed unity-gain differential configuration is required. Compare performance metrics such as CMRR and offset voltage against other precision amplifiers if variable gain is needed. Consider thermal management within the specified operating temperature range during PCB layout.

Part Context

This part belongs to the INA10x series of precision instrumentation amplifiers designed for high-accuracy applications. The series offers various gain options integrated into the package. The INA105 specifically provides a fixed gain of one, making it ideal for buffering differential signals while maintaining high common-mode rejection capabilities.

Replacement Considerations

Official substitutes include parts from the same family with different gain settings if circuit topology allows modification. Verify pinout compatibility and electrical specifications before replacing. Consult the manufacturer's guide for recommended alternatives if the INA105KU is discontinued.

FAQ

What is the maximum common-mode voltage range?

The common-mode voltage range extends from the negative supply rail to the positive supply rail, allowing full-scale differential input handling.

Is the gain adjustable?

No, the INA105KU has a fixed unity gain determined by the internal laser-trimmed resistor network.