INA128 Precision, 130-dB CMRR, 700-µA, Low-Power, Instrumentation Amplifier |

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Precision, 130-dB CMRR, 700-µA, Low-Power, Instrumentation Amplifier


Recommended alternative parts

  • INA828  -  Higher GBW (2MHz), identical DC precision, higher CMRR (140dB Min) and lower bias current (0.6nA max) while reducing BOM cost


The INA128 and INA129 are low-power, general purpose instrumentation amplifiers offering excellent accuracy. The versatile 3-op amp design and small size make these amplifiers ideal for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200 kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. The INA128 provides an industry-standard gain equation; the INA129 gain equation is compatible with the AD620.

The INA12x is available in 8-pin plastic DIP and SO-8 surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.

The upgraded INA828 offers a lower input bias current (0.6 nA maximum) and lower noise (7 nV/√Hz) at the same quiescent current. See the Device Comparsion Table for a selection of precision instrumentation amplifiers from Texas Instruments.


  • A newer version of this device is now available: INA828
  • Low offset voltage: 50 µV maximum
  • Low drift: 0.5 µV/°C maximum
  • Low Input Bias Current: 5 nA maximum
  • High CMR: 120 dB minimum
  • Inputs protected to ±40 V
  • Wide supply range: ±2.25 V to ±18 V
  • Low quiescent current: 700 µA
  • Packages: 8-pin plastic DIP, SO-8

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Part number Order Number of channels (#) Vs (Min) (V) Vs (Max) (V) CMRR (Min) (dB) Input offset (+/-) (Max) (uV) Input offset drift (+/-) (Max) (uV/C) Input bias current (+/-) (Max) (nA) Noise at 1 kHz (Typ) (nV/rt (Hz)) Iq (Typ) (mA) Bandwidth at min gain (Typ) (MHz) Gain (Min) (V/V) Gain (Max) (V/V) Gain error (+/-) (Max) (%) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Noise at 0.1 Hz-10 Hz (Typ) (uVpp) Gain non-linearity (+/-) (Max) (%)
INA128 Order now 1     4.5     36     120     50     0.5     5     8     0.7     1.3     1     10000     2     -40 to 125     PDIP | 8
SOIC | 8    
8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)    
0.2     0.012