INA114AU/1KG4

Overview

The INA114AU/1KG4 is a precision instrumentation amplifier manufactured by Texas Instruments. It features a single-channel architecture housed in an 8-pin SOIC surface-mount package. The device operates on dual power supplies ranging from ±3 V to ±15 V, with a maximum supply voltage of 36 V. Key electrical specifications include a gain bandwidth product of 1 MHz, a slew rate of 0.6 V/µs, and a minimum common-mode rejection ratio (CMRR) of 110 dB at a gain of 1. The input bias current is typically 500 pA, and the input offset voltage is 125 µV. It supports a wide operating temperature range from -40°C to +85°C.

Feature Summary

• High-precision performance with low input offset voltage and drift for accurate signal conditioning
• Excellent common-mode rejection capability ensuring noise immunity in differential measurements
• Flexible gain configuration via a single external resistor allowing gains from 1 to 10,000
• Low power consumption suitable for battery-operated or thermally constrained applications

Applications

• Strain gauge and load cell interfaces
• Thermocouple amplification
• Medical equipment signal processing
• Industrial process control systems

Procurement Notes

Verify the specific suffix '1KG4' against official Texas Instruments documentation to confirm reel quantity and tape-and-reel specifications. Ensure the SOIC-8 package variant matches the required PCB footprint. Confirm RoHS compliance status for the specific manufacturing lot. Cross-reference the date code to ensure availability of fresh stock if long-term reliability is critical. Validate that the dual-supply requirements align with the target system design.

Selection Notes

Select this component when high accuracy and low noise are required for small differential signals. The single-resistor gain setting simplifies circuit design compared to multi-op-amp solutions. Consider the 1 MHz bandwidth for applications requiring moderate speed. Verify that the input common-mode voltage range accommodates the sensor output levels. Evaluate thermal management needs given the operating temperature range limits.

Part Context

The INA114 series belongs to Texas Instruments' family of precision instrumentation amplifiers designed for high-accuracy data acquisition. Unlike general-purpose op-amps, these devices integrate matched internal resistors to provide stable gain without external trimming. The AU variant denotes the surface-mount SOIC package, offering space efficiency for modern PCB layouts while maintaining the robust performance characteristics of the through-hole counterpart.

Replacement Considerations

Potential substitutes include the INA114AP for through-hole applications or other TI instrumentation amplifiers like the INA128 if higher gain ranges are needed. Verify pin compatibility and electrical parameter overlaps before substitution. Check for updated datasheets as legacy components may have revised specifications.