INA128PG4

Overview

The INA128PG4 is a precision instrumentation amplifier manufactured by Texas Instruments, housed in an 8-pin PDIP package. It features a low power consumption of 700 µA and a high common-mode rejection ratio of 130 dB. The device offers a bandwidth of 1.3 MHz and a slew rate of 4 V/µs. Input offset voltage is typically 50 µV with a maximum of 550 µV. It operates on supply voltages ranging from 4.5 V to 36 V and supports a gain range from 1 V/V to 10,000 V/V via a single external resistor.

Feature Summary

• High precision performance with low input offset voltage
• Low power consumption suitable for battery-operated systems
• Excellent common-mode rejection ratio for noisy environments
• Single-resistor gain adjustment capability

Applications

• Strain gauge and load cell signal conditioning
• Medical equipment such as ECG and EEG amplifiers
• Industrial process control sensor interfaces
• Data acquisition systems requiring high accuracy
• Photodiode and transimpedance amplifier circuits

Procurement Notes

Verify the specific grade suffix (G4) indicates lead-free and RoHS compliance status against the latest manufacturer documentation. Confirm the PDIP-8 package availability and ensure storage conditions meet moisture sensitivity level requirements prior to assembly. Cross-reference the part number with official distributor catalogs to confirm current production status and obsolescence notices.

Selection Notes

Select this component when high common-mode rejection and low power are critical simultaneously. Compare input bias current and offset voltage specifications against other instrumentation amplifiers if ultra-low drift is required. Ensure the single-supply or dual-supply configuration matches the application voltage rails. Verify that the gain setting resistor tolerance meets the overall system accuracy requirements.

Part Context

The INA128 belongs to the INA12x family of instrumentation amplifiers known for their versatility and ease of use. It serves as a general-purpose solution for precision analog signal processing tasks. The PG4 suffix denotes a specific packaging and environmental compliance variant within the broader INA128 product line offered by Texas Instruments.

Replacement Considerations

Official substitutes include the INA128U and INA128UA for surface-mount applications. The INA2128 offers a dual-channel alternative with similar electrical characteristics. Verify pin compatibility and thermal performance when transitioning between package types or channel counts.