INA111AP

Overview

The INA111AP is a high-speed FET-input instrumentation amplifier from Texas Instruments, housed in an 8-pin PDIP package. It utilizes a current-feedback architecture to deliver extended bandwidth and rapid settling times. Key electrical parameters include a maximum input bias voltage of ±1000µV, a typical gain-bandwidth product of 2MHz at unity gain, and a maximum input bias current of 20pA. The device supports dual power supplies with a typical rating of ±15V and offers laser-trimmed offset voltage and drift for high DC precision.

Feature Summary

• FET input structure minimizes input bias current to simplify filtering and limiting circuit design
• Current-feedback architecture provides extended bandwidth and fast settling time
• Single external resistor allows gain setting from 1 to over 1000
• Laser-trimmed offset voltage and drift ensure excellent DC accuracy

Applications

• Precision data acquisition systems
• Medical equipment signal conditioning
• Industrial process control sensors
• High-impedance sensor interfaces

Procurement Notes

Verify the specific suffix 'AP' corresponds to the standard commercial temperature range and PDIP-8 package configuration as documented in the official datasheet. Confirm that the component meets RoHS compliance standards regarding antimony and bromine content. Ensure the ordering part number matches the exact pinout and electrical specifications required for the target application circuit design.

Selection Notes

Select this component when high input impedance and low bias current are critical requirements. The FET input stage makes it suitable for interfacing with high-impedance sources without significant signal degradation. Consider the current-feedback topology if wide bandwidth and fast settling are prioritized over ultra-low noise performance compared to traditional voltage-feedback instrumentation amplifiers.

Part Context

The INA111 series represents a family of instrumentation amplifiers designed for applications requiring high speed and precision. The INA111AP specifically denotes the through-hole PDIP variant within this lineup. It shares core architectural features with other members of the series but is distinguished by its physical packaging and specific manufacturing lot characteristics defined by the manufacturer's quality standards.

Replacement Considerations

Direct replacements must match the 8-pin PDIP footprint and FET-input architecture. Verify that substitute components offer comparable input bias current levels below 20pA and similar gain-bandwidth products to maintain circuit stability and signal integrity in existing designs.