Instrumentation Operational Amplifier Texas Instruments INA128P — Precision INA128P PDIP-8

Instrumentation operational amplifier Texas Instruments INA128P in PDIP-8 package. The INA128P is a precision instrumentation amplifier with differential inputs, high common-mode rejection ratio and externally adjustable gain. Designed for accurate signal conditioning and low-noise amplification, this device provides stable, linear differential amplification suitable for sensor interfaces and laboratory measurement circuits.

Advantages

The INA128P offers precision offset and low drift performance, ensuring stable measurements over temperature and time. Its differential input stage minimizes interference from common-mode signals and ground offsets. Adjustable gain via a single external resistor simplifies circuit design while maintaining low noise and good linearity. Packaged in PDIP-8, it is suitable for prototyping and through-hole assembly.

Suitable for

• Signal conditioning for bridge sensors (strain gauges, load cells)
• Temperature and pressure sensor interfaces
• Laboratory instrumentation and data acquisition front ends
• Low-noise amplification of small differential signals
• Prototyping and educational electronics projects

Key specifications

• Amplifier type: precision instrumentation amplifier with differential inputs
• Package: PDIP-8 through-hole package
• Gain: externally set using a single resistor between gain pins
• Performance: low input offset and low drift for stable measurements
• Noise: low-noise design suitable for small-signal amplification
• Common-mode rejection: high CMRR for improved interference rejection

How to use

Place the INA128P in a PDIP-8 socket or solder it to a through-hole PCB following the manufacturer pinout for input, output and power pins. Set the desired gain by connecting an appropriate external resistor between the gain-setting pins; consult the device datasheet for the gain vs. resistor relationship and recommended resistor values. Provide proper power supply decoupling close to the power pins to minimize noise and ensure stable operation. Route input traces carefully and avoid large common-mode voltages beyond the amplifier’s specifications.

Recommendations for use

For best measurement accuracy, use low-tolerance, low-temperature-coefficient resistors for gain setting, keep input source impedances balanced, and place bypass capacitors near the supply pins. Observe common-mode and supply voltage limits from the datasheet and follow PCB layout practices that minimize noise and ground loops.