Precision, Low Power Instrumentation Amplifiers - INA128


Precision, Low Power Instrumentation Amplifiers

Recommended alternative parts

  • INA129  -  Identical performance with different gain equation.
  • INA131  -  Improve input offset


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

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Parametrics Compare all products in Dual Supply

Number of Channels (#)
Vs (Min) (V)
Vs (Max) (V)
Input Bias Current (+/-) (Max) (nA)
Input Offset Drift (+/-) (Max) (uV/Degrees Celsius)
Noise at 1kHz (Typ) (nV/rt(Hz))
CMRR (Min) (dB)
Non-Linearity (+/-) (Max) (%)
Bandwidth at G=100 (Min) (kHz)
Iq (Typ) (mA)
Gain (V/V)
Output Offset (+/-) (Max) (uV)
Output Offset Drift (+/-) (Max) (uV/Degrees Celsius)
Input Offset (+/-) (Max) (uV)
Operating Temperature Range (C)
INA128 INA129
1     1    
4.5     4.5    
36     36    
5     5    
0.5     0.5    
8     8    
120     120    
0.012     0.002    
200     200    
0.7     0.7    
1 to 10000     1 to 10000    
20/G     20/G    
250     50    
Catalog     Military    
-40 to 125     -40 to 125    

Other qualified versions of INA128

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