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. 764-8747
Mfr. Part No.AD8429ARZ
HK$80.36
Each
units
Dual SOIC Surface Mount - 8 ±4 ±18V No 150µV -40 °C +125 °C 1.5GΩ 134dB 15MHz 7 mA
RS Stock No. 523-8581
Mfr. Part No.AD627ANZ
HK$75.38
Each
units
Dual, Single PDIP Through Hole 7.5 V 8 ±15V Rail to Rail Output 0.25mV -40 °C +85 °C 20GΩ 77dB - 0.085 mA
RS Stock No. 111-1152
Mfr. Part No.AD623ARMZ
HK$33.516
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. 779-8969
Mfr. Part No.LT1025CN8#PBF
HK$56.86
Each (In a Pack of 2)
units
Single CDIP Through Hole 4 to 36 V 8 - No - 0 °C +70 °C - - - 150 μA
RS Stock No. 806-7988
Mfr. Part No.AD8421ARMZ
HK$60.76
Each
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. 523-6412
Mfr. Part No.AD8221ARMZ
HK$56.76
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. 545-5770
Mfr. Part No.LTK001CN8#PBF
HK$123.22
Each
units
- PDIP Through Hole - 8 - - - 0 °C +70 °C - - - -
RS Stock No. 523-6248
Mfr. Part No.AD623ARMZ
HK$41.94
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. 121-6904
Mfr. Part No.AD8421ARMZ
HK$47.796
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. 796-8877
Mfr. Part No.AD8421BRZ
HK$108.75
Each
units
Dual, Single SOIC Surface Mount 5 36 V 8 ±2.5 ±18V No 25µV -40 °C +125 °C 4kΩ 100dB 10MHz 2.6 mA
RS Stock No. 796-8874
Mfr. Part No.AD8421BRMZ
HK$99.61
Each
units
Dual, Single MSOP Surface Mount 5 36 V 8 ±2.5 ±18V Rail to Rail Input 25µV -40 °C +125 °C 4kΩ 100dB 10MHz 2.6 mA
RS Stock No. 522-9717
Mfr. Part No.AD620ANZ
HK$101.08
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. 111-1154
Mfr. Part No.AD8221ARMZ
HK$44.657
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. 851-6884
Mfr. Part No.LTC2053HMS8#PBF
HK$85.61
Each
units
Dual, Single MSOP Surface Mount 2.7 → 6 V 8 ±5.5V Rail to Rail Output ±10µV -40 °C +125 °C - 116dB 200kHz 1 mA
New
RS Stock No. 209-6062
Mfr. Part No.AD8250ARMZ
HK$92.169
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
HK$108.49
Each
units
Single MSOP Surface Mount 15 V 10 - No ±6 - - - - 10MHz -
RS Stock No. 159-7655
Mfr. Part No.AD8228BRMZ
HK$78.078
Each (In a Tube of 50)
units
Dual MSOP Surface Mount - 8 ±2.3 ±18V No 0.05mV -40 °C +85 °C 100GΩ 100dB 650kHz 1.2 mA
RS Stock No. 183-1717
Mfr. Part No.AD623ARMZ-REEL7
HK$27.622
Each (On a Reel of 1000)
units
Dual, Single MSOP Surface Mount 2.7 12 V 8 ±2.5 to ±6V Rail to Rail Output 500µV -40 °C +85 °C - 105dB 800kHz 550 μA
RS Stock No. 709-5563
Mfr. Part No.AMP02EPZ
HK$260.47
Each
units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±5 V, ±9 V No 0.1mV -40 °C +85 °C 16.5GΩ 80dB - 6 mA
RS Stock No. 884-6769
Mfr. Part No.LT1789IS8-1#PBF
HK$80.31
Each
units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Output 100µV -40 °C +85 °C 1.6GΩ 79dB 60kHz 95 μA