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. 523-8575
Mfr. Part No.AD623ANZ
PHP407.47
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
PHP306.128
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. 709-7086
Mfr. Part No.AD8253ARMZ
PHP586.53
Each
units
Dual MSOP Surface Mount - 10 ±12 V, ±9 V No 150µV -40 °C +85 °C 0.00002GΩ 80dB 10MHz -
RS Stock No. 647-643
Mfr. Part No.INA110KP
PHP967.77
Each
units
Dual PDIP Through Hole - 16 ±15V No 500µV -25 °C +85 °C 5000GΩ 106dB 2.5MHz 4.5 mA
RS Stock No. 209-6062
Mfr. Part No.AD8250ARMZ
PHP608.309
Each (In a Tube of 50)
units
Single MSOP Surface Mount 15 V 10 - No ±6 - - - - 10MHz -
RS Stock No. 806-5522
Mfr. Part No.AD623ARZ
PHP285.035
Each (In a Pack of 2)
units
Dual, Single SOIC Surface Mount 3 12 V 8 ±2.5 ±6V Rail to Rail Output 200µV -40 °C +85 °C - 90dB 800kHz 500 μA
RS Stock No. 912-8135
Mfr. Part No.AD623ARZ
PHP241.815
Each (In a Tube of 98)
units
Dual, Single SOIC Surface Mount 3 12 V 8 ±2.5 ±6V Rail to Rail Output 200µV -40 °C +85 °C - 90dB 800kHz 500 μA
RS Stock No. 759-0027
Mfr. Part No.AD8226ARZ
PHP164.64
Each
units
Dual, Single SOIC Surface Mount 2.2 36 V 8 ±1.35 ±18V Rail to Rail Output 100µV -40 °C +125 °C 100kΩ 80dB 1.5MHz 350 μA
RS Stock No. 759-0099
Mfr. Part No.AD8495CRMZ
PHP573.71
Each
units
Dual, Single MSOP Surface Mount 2.7 36 V 8 ±2.7 ±18V Rail to Rail Output - -40 °C +125 °C - - 25kHz 0.25 mA
RS Stock No. 100-0743
Mfr. Part No.INA110KP
PHP852.526
Each (In a Tube of 25)
units
Dual PDIP Through Hole - 16 ±15V - 500µV -25 °C +85 °C 5000GΩ 106dB 2.5MHz 4.5 mA
RS Stock No. 209-6063
Mfr. Part No.AD8250ARMZ
PHP716.03
Each
units
Single MSOP Surface Mount 15 V 10 - No ±6 - - - - 10MHz -
RS Stock No. 923-6683
Mfr. Part No.INA333AIDGKT
PHP208.373
Each (On a Reel of 250)
units
Dual, Single MSOP Surface Mount 1.8 5.5 V 8 ±0.9 ±2.75V Rail to Rail Output 0.025mV -40 °C +150 °C 100GΩ 80dB 150kHz 0.075 mA
RS Stock No. 704-4032
Mfr. Part No.INA333AIDGKT
PHP319.90
Each
units
Dual, Single MSOP Surface Mount 1.8 5.5 V 8 ±0.9 ±2.75V Rail to Rail Output 0.025mV -40 °C +150 °C 100GΩ 80dB 150kHz 0.075 mA
RS Stock No. 522-9717
Mfr. Part No.AD620ANZ
PHP803.94
Each
units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.125mV -40 °C +85 °C 10GΩ 73dB 1MHz -
RS Stock No. 660-5254
Mfr. Part No.INA126P
PHP232.55
Each
units
Dual PDIP Through Hole 12 V, 15 V, 18 V, 24 V, 28 V, 3 V, 5 V, 9 V 8 ±15V No 0.25mV -40 °C +85 °C 1GΩ 83dB - 0.2 mA
RS Stock No. 523-7572
Mfr. Part No.AD620BRZ
PHP898.83
Each
units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.05mV -40 °C +85 °C 10GΩ 80dB 120kHz -
RS Stock No. 923-3546
Mfr. Part No.INA126P
PHP197.054
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 - 0.25mV -40 °C +85 °C 1GΩ 83dB - 0.2 mA
RS Stock No. 121-6904
Mfr. Part No.AD8421ARMZ
PHP298.925
Each (In a Tube of 50)
units
Dual, Single MSOP Surface Mount 5 6 V 8 ±2.5 ±18V - 60µV -40 °C +85 °C 20kΩ 134dB 10MHz 2.3 mA
RS Stock No. 764-8747
Mfr. Part No.AD8429ARZ
PHP466.14
Each
units
Dual SOIC Surface Mount - 8 ±4 ±18V No 150µV -40 °C +125 °C 1.5GΩ 134dB 15MHz 7 mA
RS Stock No. 697-7228
Mfr. Part No.AD8220ARMZ
PHP350.37
Each
units
Dual, Single MSOP Surface Mount 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V Rail to Rail Output 0.3mV -40 °C +85 °C - 74dB 1.5MHz -