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. 190-1414
Mfr. Part No.MAX31855KASA+
HK$61.995
Each (In a Pack of 2)
units
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1350 °C - - - 1500 μA
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 -
RS Stock No. 709-5083
Mfr. Part No.AD8251ARMZ
HK$102.45
Each
units
Dual MSOP Surface Mount - 10 ±12 V, ±9 V No - -40 °C +85 °C - 80dB - -
RS Stock No. 661-2463
Mfr. Part No.INA121U
HK$80.86
Each
units
Dual SOIC Surface Mount - 8 ±15V No 500µV -40 °C +85 °C 1000GΩ 78dB 600kHz 0.525 mA
RS Stock No. 160-4531
Mfr. Part No.AD8293G160ARJZ-R7
HK$7.156
Each (On a Reel of 3000)
units
Single SOT-23 Surface Mount 1.8 5.5 V 8 - Rail to Rail Output 50µV -40 °C 85 °C - 94dB 500Hz 1.5 mA
RS Stock No. 796-8871
Mfr. Part No.AD8428ARZ
HK$128.85
Each
units
Dual SOIC Surface Mount - 8 ±4 ±18V Rail to Rail Input 100µV -40 °C +85 °C 4kΩ 140dB 3.5MHz 6.8 mA
RS Stock No. 661-2390
Mfr. Part No.INA126EA/250
HK$32.35
Each
units
Dual MSOP Surface Mount 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. 102-5656
Mfr. Part No.INA217AIP
HK$55.262
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. 523-7572
Mfr. Part No.AD620BRZ
HK$123.34
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. 660-4239
Mfr. Part No.INA118PB
HK$164.16
Each
units
Dual PDIP Through Hole - 8 ±15V No - -40 °C +125 °C 10GΩ 80dB - 0.385 mA
RS Stock No. 761-9648
Mfr. Part No.LTC6800HMS8#PBF
HK$36.63
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
RS Stock No. 660-6500
Mfr. Part No.INA110KU
HK$166.13
Each
units
Dual SOIC Surface Mount - 16 ±15V No - -25 °C +85 °C 5000GΩ 106dB - 4.5 mA
RS Stock No. 121-9040
Mfr. Part No.INA121P
HK$67.389
Each (In a Tube of 50)
units
Dual PDIP Through Hole - 8 ±15V - - -40 °C +85 °C 1000GΩ 78dB - 0.525 mA
RS Stock No. 252-1593
Mfr. Part No.INA125PA
HK$61.28
Each
units
Dual, Single PDIP Through Hole 5 V 16 ±15V No 0.5mV -55 °C +125 °C 100GΩ 72dB - -
RS Stock No. 412-462
Mfr. Part No.AD627ARZ
HK$66.95
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. 197-7472
Mfr. Part No.PGA205AP
HK$146.906
Each (In a Tube of 25)
units
Dual PDIP Through Hole ±18 V 16 - No - - - - - 1MHz -
RS Stock No. 660-5279
Mfr. Part No.INA129P
HK$86.16
Each
units
Dual PDIP Through Hole - 8 ±15V No - -40 °C +85 °C 100GΩ 80dB - -
RS Stock No. 806-7994
Mfr. Part No.AD8426ACPZ-WP
HK$56.76
Each
units
Dual, Single LFCSP Surface Mount 2.2 36 V 16 ±1.35 ±18V Rail to Rail Output 200µV -40 °C +125 °C 100kΩ 105dB 1MHz 600 (Quiescent) μA
RS Stock No. 203-4727
Mfr. Part No.HV56020T-V/KXX
BrandMicrochip
HK$23.184
Each (On a Reel of 3000)
units
Dual VQFN Surface Mount 2.7 V 43 - No 110V - - - - - -
RS Stock No. 759-0033
Mfr. Part No.AD8227ARMZ
HK$26.88
Each
units
Dual, Single MSOP Surface Mount 2.2 36 V 8 ±1.5 ±18V Rail to Rail Output 0.2mV -40 °C +125 °C 0.8GΩ 90dB 250kHz 0.425 mA