INA128P

Overview

The INA128P is a precision, low-power instrumentation amplifier manufactured by Texas Instruments. It features an external gain-setting resistor and offers high input impedance with low power consumption of 700 µA. The device provides a typical common-mode rejection ratio of 130 dB and a bandwidth of 1.3 MHz. It operates on dual supplies ranging from ±2.25 V to ±18 V or single supplies up to 36 V. Housed in an 8-pin PDIP package, it supports operation temperatures from -40°C to +85°C.

Feature Summary

• Precision instrumentation amplifier with external gain-setting resistor
• Low power consumption of 700 µA per device
• High common-mode rejection ratio for accurate signal conditioning
• Wide supply voltage range supporting flexible system designs

Applications

• Strain gauge and bridge sensor interfaces
• Medical equipment such as ECG and EEG systems
• Industrial process control and data acquisition
• Photodiode and transimpedance amplifier circuits
• Precision current sensing applications

Procurement Notes

Verify the specific suffix and package type when ordering, as variations exist between DIP and SOIC formats. Confirm the operating temperature range matches your application requirements, noting that standard versions support -40°C to +85°C while extended variants may differ. Ensure compatibility with your PCB footprint and assembly processes before finalizing procurement decisions.

Selection Notes

Select the INA128P when high precision and low power are critical for battery-operated or portable instruments. Its external gain resistor allows flexible configuration without internal trimming. Consider the PDIP package for prototyping or through-hole manufacturing needs. Evaluate the 1.3 MHz bandwidth against your signal frequency requirements to ensure adequate performance for dynamic measurements.

Part Context

The INA128P belongs to the INA12x family of precision instrumentation amplifiers from Texas Instruments. This series is widely recognized for its versatility in low-level signal amplification. The P suffix denotes the plastic dual in-line package variant. It serves as a foundational component in analog front-end design for various measurement and sensing industries.

Replacement Considerations

Official substitutes within the same family include the INA128U for surface-mount applications. Verify pinout compatibility and electrical specifications before substitution. Ensure that any replacement maintains the required common-mode rejection ratio and power consumption levels for your specific circuit design.