INA131AP-1

Overview

The INA131AP-1 is a precision instrumentation amplifier from Texas Instruments featuring a fixed gain of 100 V/V. It utilizes a three-op amp architecture to deliver high accuracy and low offset voltage, specified at a maximum of 125 µV. The device operates with a single supply voltage range of 4.5 V to 36 V or dual supplies up to ±18 V. Key electrical characteristics include a bandwidth of 70 kHz, a slew rate of 0.7 V/µs, and an input bias current of 500 pA. Housed in an 8-pin PDIP package, it offers a cost-effective solution for general-purpose signal conditioning applications requiring precise amplification.

Feature Summary

• Fixed unity-gain-bandwidth product configuration optimized for specific gain requirements
• Three operational amplifier internal topology ensures high common-mode rejection ratio
• Low input bias current capability minimizes loading effects on high-impedance sources

Applications

• Precision sensor signal conditioning
• Industrial process control systems
• Medical instrumentation front-ends

Procurement Notes

Verify the exact suffix designation as datasheets may list INA131AP without the -1 suffix. Confirm package type matches the required DIP-8 form factor. Check manufacturer status as some variants may be obsolete. Ensure supply voltage ranges align with system design constraints before ordering.

Selection Notes

Select this component when a fixed gain of 100 is required without external resistor programming. Consider the 70 kHz bandwidth limit for high-speed applications. Evaluate the 125 µV max offset for DC accuracy needs. Compare power consumption against other instrumentation amplifiers in the same family for efficiency optimization.

Part Context

This part belongs to Texas Instruments' instrumentation amplifier portfolio, designed for precision analog signal processing. It complements programmable-gain variants by offering a simplified, fixed-gain alternative. The series targets applications where stability and accuracy are prioritized over adjustable gain flexibility.

Replacement Considerations

Check for direct pin-compatible substitutes within the INA131 family. Verify if newer revisions have replaced the -1 suffix variant. Ensure functional equivalence in gain, bandwidth, and package dimensions before substitution.