Instrumentation Amplifiers

Instrumentation amplifiers are a type of precision gain block, a differential amplifier (a type of electronic amplifier that amplifies the voltage difference between two inputs but suppresses any voltage common to the two inputs). Instrumentation Amplifiers are also known as in-amps.

Common applications are:

• Test & Measurement Industrial Devices
• Data Acquisition Devices
• Medical Devices
• Any noisy environment where large common-mode signals are present

How do instrumentation amplifiers work?

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.

What are the instrumentation amplifiers used for?

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.

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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. 121-6904
Mfr. Part No.AD8421ARMZ
HK$46.886
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. 523-6248
Mfr. Part No.AD623ARMZ
HK$39.92
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. 165-4166
Mfr. Part No.MCP6N16-100E/MS
BrandMicrochip
HK$13.09
Each (In a Tube of 100)
units
Single MSOP Surface Mount 1.8 5.5 V 8 - Rail to Rail Output 17µV -40 °C +125 °C 1kΩ 112dB 35MHz -
RS Stock No. 197-7155
Mfr. Part No.INA125UA
HK$57.70
Each (In a Pack of 2)
units
Dual SOIC Surface Mount ±15 V 16 - - ±500µV - - - - - -
RS Stock No. 197-7472
Mfr. Part No.PGA205AP
HK$133.145
Each (In a Tube of 25)
units
Dual PDIP Through Hole ±18 V 16 - No - - - - - 1MHz -
RS Stock No. 197-7156
Mfr. Part No.INA126UA
HK$22.762
Each (In a Tube of 75)
units
Dual SOIC Surface Mount ±15 V 8 - - 250µV - - - - - -
RS Stock No. 759-1294
Mfr. Part No.AD8236ARMZ
HK$22.95
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. 159-8114
Mfr. Part No.AD8222ACPZ-WP
HK$64.01
Each (In a Tray of 64)
units
Dual LFCSP VQ Surface Mount - 16 ±2.3 ±18V No 0.15mV -40 °C +85 °C 100GΩ 80dB 1.2MHz 1.2 mA
RS Stock No. 183-2440
Mfr. Part No.AMP04FPZ
HK$158.73
Each
units
Single PDIP Through Hole ±15 V 8 - Rail to Rail Output 600µV -40 °C +85 °C 4GΩ 55dB 70kHz 850 μA
RS Stock No. 829-0551
Mfr. Part No.MCP6N16-010E/MS
BrandMicrochip
HK$16.17
Each (In a Pack of 5)
units
Single MSOP Surface Mount 1.8 5.5 V 8 - Rail to Rail Output 22µV -40 °C +125 °C 1kΩ 103dB 5MHz -
RS Stock No. 162-5030
Mfr. Part No.INA2141U
HK$140.42
Each (In a Tube of 40)
units
Dual SOIC Surface Mount - 16 ±15V No 0.1mV -40 °C +85 °C 10GΩ 97dB - 1.6 mA
RS Stock No. 197-7473
Mfr. Part No.PGA205AP
HK$154.14
Each
units
Dual PDIP Through Hole ±18 V 16 - No - - - - - 1MHz -
RS Stock No. 145-6995
Mfr. Part No.AD5750-1ACPZ
HK$36.62
Each (In a Tray of 490)
units
Dual LFCSP Surface Mount 2.7 5.5 V 32 ±12 ±24V - - -40 °C +105 °C - - 100kHz -
RS Stock No. 160-4531
Mfr. Part No.AD8293G160ARJZ-R7
HK$6.223
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. 145-6948
Mfr. Part No.INA129PA
HK$58.447
Each (In a Tube of 50)
units
Dual PDIP Through Hole - 8 ±15V No - -40 °C +85 °C 100GΩ 73dB - -
RS Stock No. 158-0332
Mfr. Part No.LT1789IS8-1#PBF
HK$48.409
Each (In a Tube of 100)
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
RS Stock No. 162-5031
Mfr. Part No.INA2141UA
HK$104.74
Each (In a Tube of 40)
units
Dual SOIC Surface Mount - 16 ±15V No 0.25mV -40 °C +85 °C 10GΩ 93dB - 1.6 mA
RS Stock No. 796-9127
Mfr. Part No.AD5750ACPZ
HK$51.68
Each
units
Dual LFCSP Surface Mount - 32 ±12 ±24V - - -40 °C +105 °C - - 100kHz -
RS Stock No. 169-8737
Mfr. Part No.AD595CQ
HK$220.09
Each
units
Dual, Single CDIP Through Hole 5 V 14 ±15V No - -55 °C +125 °C - - 15kHz -
RS Stock No. 660-5204
Mfr. Part No.INA111BP
HK$156.70
Each
units
Dual PDIP Through Hole - 8 ±15V No - -40 °C +85 °C 10000GΩ 80dB - 4.5 mA
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