INA111APG4

Overview

The INA111APG4 is a high-speed, FET-input instrumentation amplifier manufactured by Texas Instruments. It utilizes a current-feedback topology to deliver extended bandwidth of 2 MHz at a gain of 10 and a fast settling time of 4 μs to 0.01% accuracy at a gain of 100. The device features laser-trimmed offset voltage and drift for superior DC precision. Its FET input structure limits the maximum input bias current to 20 pA. The component offers a minimum common-mode rejection ratio of 106 dB and supports gains from 1 to over 1000 via a single external resistor. It is available in an 8-pin plastic DIP package.

Feature Summary

• High-speed performance with extended bandwidth and rapid settling times enabled by current-feedback architecture
• FET input stage significantly reduces input bias current to simplify input filtering and limiting circuitry design
• Laser trimming optimizes offset voltage and drift parameters to ensure excellent DC accuracy
• Single external resistor allows flexible gain setting across a wide range from 1 to over 1000

Applications

• Medical instrumentation systems requiring high precision signal conditioning
• Data acquisition applications demanding fast settling and low noise
• Industrial process control loops utilizing sensor signals

Procurement Notes

Verify the specific suffix 'G4' indicates lead-free construction and RoHS compliance as per Texas Instruments documentation. Confirm the package type matches the required 8-pin plastic DIP form factor for your PCB layout. Ensure the operating temperature range aligns with the specified -40°C to +85°C industrial limits. Cross-reference the manufacturer part number against official TI databases to validate authenticity and current production status before finalizing procurement orders.

Selection Notes

Select this component when application requirements prioritize high speed and fast settling over ultra-low power consumption. The FET inputs are suitable for high-impedance sources where bias current must be minimized. Consider the 2 MHz bandwidth at unity gain stability constraints if higher gains are used. Evaluate the need for laser-trimmed DC accuracy versus cost-sensitive alternatives. Ensure the supply voltage range accommodates the dual or single supply configurations supported by the device.

Part Context

The INA111 series belongs to Texas Instruments' family of high-performance instrumentation amplifiers designed for precision analog signal processing. The APG4 variant specifically denotes the lead-free, environmentally compliant version of the standard INA111AP. This series is widely recognized for its balance of speed and accuracy in challenging measurement environments. It serves as a foundational building block for converting small differential signals into robust single-ended outputs for further processing.

Replacement Considerations

The INA111APG4 is functionally equivalent to the standard INA111AP. Verify pinout compatibility when substituting with other instrumentation amplifiers from the same family. Check datasheets for differences in bandwidth, offset voltage, and package dimensions to ensure mechanical and electrical fit.