INA128U-2/2K5

Description：PROTOTYPE
Series：-
Mfr：Texas Instruments
Package：Bulk

SKU:c699b6925164 Category: Instrumentation, Op Amps, Buffer Amps Brand: Texas Instruments

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Product introduction

Product Detailed Parameters

Description：PROTOTYPE
Series：-
Mfr：Texas Instruments
Package：Bulk
Amplifier Type：Instrumentation
Number of Circuits：1
Output Type：Single-Ended
Slew Rate：1.2V/µs
Gain Bandwidth Product：-
Current - Input Bias：2 nA
Voltage - Input Offset：10 µV
Current - Supply：700µA
Current - Output / Channel：15 mA
Voltage - Supply Span (Min)：4.5 V
Voltage - Supply Span (Max)：36 V
Operating Temperature：-40°C ~ 125°C
Grade：-
Qualification：-
Mounting Type：Surface Mount
Package / Case：8-SOIC (0.154", 3.90mm Width)
Supplier Device Package：8-SOIC
-3db Bandwidth：20 kHz

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INA128U-2/2K5

Overview

The INA128U/2K5 is a precision, low-power instrumentation amplifier manufactured by Texas Instruments in an 8-pin SOIC package. It features a maximum offset voltage of 50μV and a drift of 0.5μV/°C. The device operates on supply voltages ranging from ±2.25V to ±18V with a quiescent current of 700μA. It provides a minimum common-mode rejection ratio of 120dB and a bandwidth of 1.3MHz at unity gain. Inputs are protected up to ±40V.

Feature Summary

Low offset voltage and drift for high accuracy
High common-mode rejection ratio
Wide bandwidth maintained at high gains
Input protection against overvoltage

Applications

Pressure transmitters
Temperature transmitters
Weigh scales
Electrocardiogram (ECG) systems
Analog input modules

Procurement Notes

Verify the specific chip site origin (SHE or FRE) as electrical characteristics vary between fabrication flows. Confirm the presence of the '/2K5' suffix indicates tape-and-reel packaging when ordering. Ensure the design accounts for the specified thermal resistance values for the SOIC-8 package under expected operating conditions.

Selection Notes

Select this component for applications requiring low power consumption alongside high precision. The single external resistor allows flexible gain settings from 1 to 10,000. Consider the INA129 if a different gain equation is preferred for drop-in replacement scenarios. Evaluate noise performance requirements against the typical 8nV/√Hz specification.

Part Context

This device belongs to the INA12x family of instrumentation amplifiers, which includes the INA128 and INA129. These general-purpose amplifiers utilize a three-op-amp architecture. The INA128 specifically uses a 50kΩ internal resistor term in its gain equation, distinguishing it from the INA129.