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
R 157.11
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
R 89.651
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. 252-1616
Mfr. Part No.INA126PA
R 51.03
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. 369-6705
Mfr. Part No.INA126PA
R 43.146
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. 759-2578
Mfr. Part No.AD8497ARMZ
R 103.24
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. 697-7234
Mfr. Part No.AD8223ARZ
R 46.836
Each (In a Pack of 5)
units
Dual, Single SOIC Surface Mount 3 24 V 8 ±2 ±12V Rail to Rail Output 0.25mV -40 °C +85 °C 2GΩ 80dB - -
RS stock no. 522-9717
Mfr. Part No.AD620ANZ
R 254.56
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. 759-0080
Mfr. Part No.AD8495ARMZ
R 189.52
Each
units
Dual, Single MSOP Surface Mount 2.7 36 V 8 ±2.7 ±18V Rail to Rail Output - -40 °C +125 °C 60kΩ - 25kHz 0.25 mA
RS stock no. 912-8135
Mfr. Part No.AD623ARZ
R 62.304
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. 806-5522
Mfr. Part No.AD623ARZ
R 73.675
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. 922-3259
Mfr. Part No.INA126U
R 57.385
Each (In a Tube of 75)
units
- - - - - - - - - - - - - -
RS stock no. 661-2460
Mfr. Part No.INA126U
R 67.66
Each
units
Dual SOIC Surface Mount 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±15V No 0.25mV -40 °C +85 °C 1GΩ 83dB - 0.2 mA
RS stock no. 518-069
Mfr. Part No.EL8170FSZ
BrandIntersil
R 29.174
Each (In a Pack of 5)
units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Input/Output 0.2mV -40 °C +125 °C - 90dB - 0.095 mA
RS stock no. 177-7115
Mfr. Part No.EL8170FSZ
BrandIntersil
R 28.699
Each (In a Tube of 97)
units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Input/Output 0.2mV -40 °C +125 °C - 90dB - 0.095 mA
RS stock no. 923-2379
Mfr. Part No.INA131AP
R 149.962
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
R 174.66
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. 759-1294
Mfr. Part No.AD8236ARMZ
R 46.26
Each
units
Single MSOP Surface Mount 1.8 5.5 V 8 - Rail to Rail Output 3.5mV -40 °C +125 °C 440GΩ 86dB 23kHz 0.05 mA
RS stock no. 523-0212
Mfr. Part No.AD620ARZ
R 159.46
Each
units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.125mV -40 °C +85 °C 10GΩ 73dB 120kHz -
RS stock no. 697-6962
Mfr. Part No.AD623BRZ
R 124.10
Each
units
Dual, Single SOIC Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.1mV -40 °C +85 °C 2GΩ 77dB - -
RS stock no. 761-9648
Mfr. Part No.LTC6800HMS8#PBF
R 60.24
Each
units
Single MSOP Surface Mount 5 V 8 - Rail to Rail Input/Output ±0.1mV -40 °C +125 °C - 116dB 200kHz 1.3 mA