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INA128UAG4

INA128UAG4 Instrumentation Amplifier, 25 µV Offset

MPNINA128UAG4
End of Life

Texas Instruments INA128UAG4, precision instrumentation amplifier, single circuit, 4 V/µs slew rate, 1.3 MHz -3 dB bandwidth, 25 µV input offset, 8-SOIC package, -40 to 125 °C operating range.

$6.7000Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

INA128UAG4 specifications
ParameterValue
MountingSurface Mount
Amplifier typeInstrumentation
Voltage - input offset25 µV
Voltage - supply span4.5 V
Current - supply700µA
Current - input bias2 nA
Current - output (Channel)15 mA
Operating temperature-40°C~125°C
-3db bandwidth1.3 MHz
PackageTube
Slew rate4V/µs
Case8-SOIC (0.154\", 3.90mm Width)
Number of circuits1

Product details

Precision difference amplifier — 25 µV offset sets the floor

The 25 µV input offset voltage defines the error floor for bridge, strain-gauge, and thermocouple conditioning — a standard op-amp would add an order of magnitude more offset and drift.

The 1.3 MHz -3 dB bandwidth and 4 V/µs slew rate tell you this part is sized for industrial sensor frequencies, not video or RF. At a gain of 100, the bandwidth narrows to roughly 13 kHz — enough for most process-control loops but not for fast transient capture. The 2 nA input bias current keeps the voltage error across source impedance manageable even with 10 kΩ bridge resistors.

Supply current and output drive — thermal budget check

Quiescent supply current is 700 µA — light enough for multi-channel battery-powered data loggers. The 8-SOIC package dissipates that power without issue across the temperature range, but the copper pad area under the package sets the real thermal resistance.

No official successor or second-source cross-reference is documented, so confirm the BOM position count before committing.

Frequently asked questions

Can INA128UAG4 be used in single-supply circuits?

Yes, the INA128UAG4 operates from a single supply as low as 4.5 V up to 36 V. In single-supply mode the input common-mode range shifts — the output can swing within about 1.5 V of the rails, so the reference pin should be biased to mid-supply for bipolar input signals.

What is the closest pin-compatible alternative to INA128UAG4 in this component family?

The INA128UAG4 is the standard-grade version of the INA128 family. The INA128UA (without the G4 suffix) is functionally identical and pin-compatible — the G4 suffix indicates a RoHS-compliant, lead-free finish. Both share the same 8-SOIC footprint, offset spec, and bandwidth. No other pin-compatible second source is documented outside the TI family.