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. 111-2200
Mfr. Part No.AD623ANZ
SGD8.316
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. 523-8575
Mfr. Part No.AD623ANZ
SGD9.81
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. 311-552
Mfr. Part No.PGA204AP
SGD29.21
Each
units
Dual PDIP Through Hole - 16 ±15V No 125µV -40 °C +85 °C 10GΩ 75dB 1MHz 7.5 mA
RS Stock No. 806-5522
Mfr. Part No.AD623ARZ
SGD7.23
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. 923-2372
Mfr. Part No.PGA204AP
SGD25.746
Each (In a Tube of 25)
units
Dual PDIP Through Hole - 16 ±15V - 125µV -40 °C +85 °C 10GΩ 75dB 1MHz 7.5 mA
RS Stock No. 912-8135
Mfr. Part No.AD623ARZ
SGD6.146
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. 412-462
Mfr. Part No.AD627ARZ
SGD10.89
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
RS Stock No. 177-7115
Mfr. Part No.EL8170FSZ
BrandIntersil
SGD4.011
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. 518-069
Mfr. Part No.EL8170FSZ
BrandIntersil
SGD4.704
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. 786-3142
Mfr. Part No.AD8422BRZ
SGD15.36
Each
units
Dual SOIC Surface Mount - 8 ±1.8 ±18V Rail to Rail Output 75µV -40 °C +85 °C - 150dB 2.2MHz 30 μA
RS Stock No. 923-3662
Mfr. Part No.PGA202KP
SGD24.55
Each (In a Tube of 25)
units
Dual PDIP Through Hole - 14 ±15V - 2mV 0 °C +70 °C 10GΩ 80dB 1MHz -
RS Stock No. 252-1593
Mfr. Part No.INA125PA
SGD10.59
Each
units
Dual, Single PDIP Through Hole 5 V 16 ±15V No 0.5mV -55 °C +125 °C 100GΩ 72dB - -
RS Stock No. 660-5254
Mfr. Part No.INA126P
SGD6.70
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 0.25mV -40 °C +85 °C 1GΩ 83dB - 0.2 mA
RS Stock No. 523-6248
Mfr. Part No.AD623ARMZ
SGD7.37
Each
units
Dual, Single MSOP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.5mV -40 °C +85 °C 2GΩ 70dB - -
RS Stock No. 121-8507
Mfr. Part No.INA125PA
SGD8.05
Each (In a Tube of 25)
units
- - - - - - - - - - - - - -
RS Stock No. 923-3546
Mfr. Part No.INA126P
SGD5.67
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. 660-6613
Mfr. Part No.PGA202KP
SGD33.44
Each
units
Dual PDIP Through Hole - 14 ±15V No 2mV 0 °C +70 °C 10GΩ 80dB - -
RS Stock No. 111-1152
Mfr. Part No.AD623ARMZ
SGD5.796
Each (In a Tube of 50)
units
Dual, Single MSOP Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.5mV -40 °C +85 °C 2GΩ 70dB - -
RS Stock No. 709-2078
Mfr. Part No.INA122U
SGD12.76
Each
units
Dual, Single SOIC Surface Mount 5 V 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V Rail to Rail Output 0.25mV -40 °C +85 °C 10GΩ 83dB - 0.085 mA
RS Stock No. 761-8936
Mfr. Part No.LTC1100CSW#PBF
SGD25.75
Each
units
Single SOIC W Surface Mount 5 V 16 - Rail to Rail Output ±0.01mV -40 °C +85 °C - 90dB 180kHz 4.5 mA