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INA132UA/2K5

Unity-Gain Difference Amplifier, 2.7-36V, 90dB CMRR, SOIC-8

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Manufacturer Part：

INA132UA/2K5

Package：

SOIC-8 (4.9 x 3.9 x 1.5 mm)

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Description

Product Overview

The INA132UA/2K5 from Texas Instruments is a single-supply difference amplifier with unity gain, 75 uV offset, and 1.6 mA supply current in an SOIC-8 package.

Key Specifications

Type Single-Supply Difference Amplifier
Gain 1 V/V (fixed, internal 40k/40k resistors)
Supply Voltage 2.7 V to 36 V (single) or +/-1.35V to +/-18V
Input Offset Voltage 75 uV (typical)
CMRR 90 dB (min)
Bandwidth 1.5 MHz
Slew Rate 1.2 V/us
Supply Current 1.6 mA (typical)
Input Impedance 40 kOhm (differential)
Output Swing (V-)+0.1V to (V+)-0.2V
Package SOIC-8
Operating Temperature -40C to +85C

Features

  • Unity gain difference amplifier with internal resistors
  • Single-supply operation (2.7V to 36V)
  • 90 dB minimum CMRR
  • 75 uV typical offset voltage
  • Complete difference amplifier – no external resistors needed
  • Input common-mode range includes ground
  • Output swings to within 100 mV of ground

Applications

  • Current shunt measurement
  • Bridge sensor signal conditioning
  • Battery voltage monitoring
  • Differential to single-ended conversion

The INA132UA/2K5 from Texas Instruments is a unity-gain difference amplifier with precision internal 40 kOhm resistor networks in a single SOIC-8 package. The device provides complete difference amplification with no external components, converting a differential input voltage to a single-ended output referenced to a user-set reference voltage. The 90 dB minimum CMRR ensures accurate differential measurement even in the presence of large common-mode voltages. Single-supply operation from 2.7 V to 36 V with input common-mode range including ground and output swing to within 100 mV of ground makes it ideal for low-side current sensing and battery monitoring. The 75 uV typical offset voltage supports accurate measurement of small differential signals.

The INA132UA/2K5 implements a classic three-op-amp difference amplifier using a single op amp with four precision-trimmed 40 kOhm thin-film resistors integrated on-chip. The output voltage is VOUT = (V+IN – V-IN) x GAIN + VREF, where GAIN = 1.0 (fixed by the internal 40k/40k resistor ratio) and VREF sets the output baseline. The 40 kOhm input impedance is determined by the internal resistor values. The CMRR of 90 dB depends on the matching accuracy of the four internal resistors, which are laser-trimmed during manufacturing. The reference pin allows the output to be offset from ground, useful for single-supply applications where the differential signal may be negative. The input common-mode range extends to 200 mV below the negative supply rail, enabling true ground-referenced sensing in single-supply systems.

Pin Name Type Function
1 Vref Input Reference voltage (output offset)
2 VIN- Input Inverting input (through 40k resistor)
3 VIN+ Input Non-inverting input (through 40k resistor)
4 V- Power Negative supply (or GND for single supply)
5 NC – No connect
6 VOUT Output Amplifier output
7 V+ Power Positive supply (2.7-36V)
8 Sense Input Output sense (for kelvin sensing)
  • Low-side current shunt measurement with single-supply ADC interface
  • Wheatstone bridge sensor output differential-to-single-ended conversion
  • 48V battery stack individual cell voltage monitoring
  • 4-20mA loop receiver with 250 Ohm shunt and difference amplifier
Manufacturer Part Number Package Notes
TI INA132PA DIP-8 Through-hole version
TI INA143UA SOIC-8 Gain of 0.5 or 2, similar family
ADI AD8276BRMZ MSOP-8 Gain of 0.5/1/2, similar class
TI INA146UA SOIC-8 Gain of 0.1, high voltage input
TI INA148UA SOIC-8 +/-200V common-mode, difference amp
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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