INA129-EP Enhanced Product Precision, Low Power Instrumentation Amplifiers |

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Enhanced Product Precision, Low Power Instrumentation Amplifiers



The INA129-EP device is a low power, general-purpose instrumentation amplifier offering excellent accuracy. The versatile 3-op amp design and small size make the device 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 INA129-EP provides an industry-standard gain equation; the INA129-EP gain equation is compatible with the AD620.

The INA129-EP device is laser trimmed for very low offset voltage, drift, and high common-mode rejection (113 dB at G ≥ 100). It operates with power supplies as low as ±2.25 V, and quiescent current is only 750 µA–ideal for battery operated systems. Internal input protection can withstand up to ±40 V without damage.

The INA129-EP is available in a 8-Pin SOIC surface-mount package specified for the –55°C to 125°C temperature range.


  • Low Offset Voltage
  • Low Input Bias Current
  • High CMR: 95 dB (Typical)
  • Inputs Protected to ±40 V
  • Wide Supply Range: ±2.25 V to ±18 V
  • Low Quiescent Current: 2 mA (Typical)
    • Bridge Amplifier
    • Thermocouple Amplifier
    • RTD Sensor Amplifier
    • Medical Instrumentation
    • Data Acquisition
    • Supports Extreme Temperature Applications:
      • Controlled Baseline
      • One Assembly and Test Site
      • One Fabrication Site
      • Available in Military (–55°C to +125°C)
        Temperature Range(1)
      • Extended Product Life Cycle
      • Extended Product-Change Notification
      • Product Traceability

(1) Custom temperature ranges available
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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) (%)
INA129-EP Order now 1     4.5     36     120     100     0.5     5     8     0.7     1.3     1     10000     2     -55 to 125     SOIC | 8     8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)     0.2     0.002