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

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

Recommended alternative parts

  • INA129  -  Identical performance with different gain equation.
  • INA828  -  Improved DC performance, wider bandwidth, and lower noise


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 laser-trimmed for very low offset voltage (50 µV), drift (0.5 µV/°C) and high common-mode rejection (120 dB at G ≥ 100). The INA12x operates with power supplies as low as ±2.25 V, and quiescent current is only 700 µA, ideal for battery-operated systems. Internal input protection can withstand up to ±40 V without damage.

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.


  • 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
  • 8-Pin Plastic Dip, SO-8

All trademarks are the property of their respective owners.

View more

Parametrics Compare all products in Instrumentation Amplifiers

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 1kHz (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 INA129
1    1   
4.5    4.5   
36    36   
120    120   
50    50   
0.5    0.5   
5    5   
8    8   
0.7    0.7   
1.3    1.3   
1    1   
10000    10000   
2    2   
Catalog    Catalog   
-40 to 125    -40 to 125   
See datasheet (PDIP)
8SOIC: 29 mm2: 6 x 4.9(SOIC)   
See datasheet (PDIP)
8SOIC: 29 mm2: 6 x 4.9(SOIC)   
0.2    0.2   
0.012    0.002   

Other qualified versions of INA128

Version Part Number Definition
High-Temperature INA128-HT High-Temperature product for harsh environments