Instrumentation Amplifiers

Instrumentation amplifiers (sometimes shortened to In-Amps) are a type of precision gain block used in electronic and measurement test equipment. Instrumentation amplifiers act as a differential amplifier; a type of electronic amplifier that amplifies the voltage difference between two inputs but suppresses any voltage signals that are common to the two inputs. RS Components offer a range of instrumentation amplifiers from several trusted brands in the industry, including Analog Devices, Microchip, Texas Instruments, and more.

How do instrumentation amplifiers work?

Instrumentation amplifiers are almost always composed of 3 op-amps (operational amplifiers) and several resistors. They provide the most important function of CMR (common-mode rejection) by cancelling out any signals that have the same potential as received by both of the inputs. Any signals that have different potentials get amplified. They are used for low frequency signals (such as <1MHz), which they amplify whilst also cutting out any common-mode noise that may be present in the input signal.

What are the instrumentation amplifiers used for?

An instrumentation amplifier measures small signals in a noisy environment. The noise generally is "common-mode noise" (the difference between the noise-free common-mode voltage and the actual common-mode voltage). An instrumentation amplifier uses its common-mode rejection to distinguish the noise from the signal of interest. Instrumentation amplifiers are needed in nearly every field of electronics, particularly in the test and measurement industry. They can be used as a voltage follower, selective inversion circuit, a current-to-voltage converter, active rectifier, integrator, a variety of filters, and a voltage comparator.

Unlike instrumentation amplifiers (In Amp), operational amplifiers (Op-Amp) are high-gain voltage amplifying devices with a differential input.

Typical applications

  • Test & Measurement Industrial Devices
  • Data Acquisition Devices
  • Medical Devices

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Description Price Power Supply Type Package Type Mounting Type Typical Single Supply Voltage Pin Count Typical Dual Supply Voltage Rail to Rail Maximum Input Offset Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Input Resistance Minimum CMRR Typical Gain Bandwidth Product Maximum Supply Current
RS Stock No. 102-5656
Mfr. Part No.INA217AIP
$9.944
Each (In a Tube of 50)
units
Dual PDIP Through Hole - 8 ±15V - 250µV -40 °C +125 °C 0.06GΩ 70dB 3.4MHz -
RS Stock No. 660-4251
Mfr. Part No.INA217AIP
$11.15
Each
units
Dual PDIP Through Hole - 8 ±15V No 250µV -40 °C +125 °C 0.06GΩ 70dB 3.4MHz -
RS Stock No. 523-8575
Mfr. Part No.AD623ANZ
$11.96
Each
units
Dual, Single PDIP Through Hole 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.2mV -40 °C +85 °C 2GΩ 70dB - -
RS Stock No. 111-2200
Mfr. Part No.AD623ANZ
$8.84
Each (In a Tube of 50)
units
Dual, Single PDIP Through Hole 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.2mV -40 °C +85 °C 2GΩ 70dB - -
RS Stock No. 412-462
Mfr. Part No.AD627ARZ
$11.59
Each
units
Dual, Single SOIC Surface Mount 7.5 V 8 ±15V Rail to Rail Output 0.25mV -40 °C +85 °C 20GΩ 77dB - 0.085 mA
New
RS Stock No. 209-6062
Mfr. Part No.AD8250ARMZ
$17.022
Each (In a Tube of 50)
units
Single MSOP Surface Mount 15 V 10 - No ±6 - - - - 10MHz -
New
RS Stock No. 209-6063
Mfr. Part No.AD8250ARMZ
$19.06
Each
units
Single MSOP Surface Mount 15 V 10 - No ±6 - - - - 10MHz -
RS Stock No. 923-2379
Mfr. Part No.INA131AP
$15.341
Each (In a Tube of 50)
units
Dual, Single PDIP Through Hole 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±15V - 0.125mV -40 °C +85 °C 10GΩ 106dB - 3 mA
RS Stock No. 311-530
Mfr. Part No.INA131AP
$18.34
Each
units
Dual, Single PDIP Through Hole 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±15V No 0.125mV -40 °C +85 °C 10GΩ 106dB - 3 mA
RS Stock No. 523-6412
Mfr. Part No.AD8221ARMZ
$10.14
Each
units
Dual, Single LFCSP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 2.7mV -40 °C +125 °C 0.8MΩ 62dB - -
RS Stock No. 111-1154
Mfr. Part No.AD8221ARMZ
$8.22
Each (In a Tube of 50)
units
Dual, Single LFCSP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 2.7mV -40 °C +125 °C 0.8MΩ 62dB - -
RS Stock No. 369-6705
Mfr. Part No.INA126PA
$4.578
Each (In a Tube of 50)
units
Dual PDIP Through Hole 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±15V No 0.5mV -40 °C +85 °C 1GΩ 74dB - 0.2 mA
RS Stock No. 252-1616
Mfr. Part No.INA126PA
$5.22
Each
units
Dual PDIP Through Hole 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±15V No 0.5mV -40 °C +85 °C 1GΩ 74dB - 0.2 mA
RS Stock No. 779-9035
Mfr. Part No.LT1101SW#PBF
$21.48
Each
units
Dual, Single SOIC Surface Mount 5 V 16 ±15V - 800µV 0 °C +70 °C 12GΩ 96dB 33kHz 105 μA
RS Stock No. 806-8013
Mfr. Part No.AD8494ARMZ
$9.54
Each
units
Dual, Single MSOP Surface Mount 2.7 36 V 8 ±2.7 ±18V - - -40 °C +125 °C 60kΩ - 30kHz 250 μA
RS Stock No. 169-8737
Mfr. Part No.AD595CQ
$63.58
Each
units
Dual, Single CDIP Through Hole 5 V 14 ±15V No - -55 °C +125 °C - - 15kHz -
RS Stock No. 412-327
Mfr. Part No.AD620BNZ
$22.46
Each
units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 50µV -40 °C +85 °C 10GΩ 80dB 120kHz -
RS Stock No. 697-7265
Mfr. Part No.AD8295ACPZ-WP
$11.75
Each
units
Dual LFCSP Surface Mount - 16 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.12mV -40 °C +85 °C 100GΩ 80dB - -
RS Stock No. 779-9110
Mfr. Part No.LT1167CS8#PBF
$13.32
Each
units
Dual SOIC Surface Mount - 8 ±2.3 → ±18V - 60µV 0 °C +70 °C 1000GΩ 120dB 1MHz 1.3 mA
RS Stock No. 162-5030
Mfr. Part No.INA2141U
$28.455
Each (In a Tube of 40)
units
Dual SOIC Surface Mount - 16 ±15V No 0.1mV -40 °C +85 °C 10GΩ 97dB - 1.6 mA