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. 660-4251
Mfr. Part No.INA217AIP
$10.88
Each
units
Dual PDIP Through Hole - 8 ±15V No 250µV -40 °C +125 °C 0.06GΩ 70dB 3.4MHz -
RS Stock No. 523-8575
Mfr. Part No.AD623ANZ
$9.68
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
$7.414
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. 412-462
Mfr. Part No.AD627ARZ
$10.49
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. 912-7167
Mfr. Part No.AD627ARZ
$7.644
Each (In a Tube of 98)
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. 923-2379
Mfr. Part No.INA131AP
$12.537
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
$16.28
Each
units
Dual, Single PDIP Through Hole 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V 8 ±15V No 0.125mV -40 °C +85 °C 10GΩ 106dB - 3 mA
RS Stock No. 165-9393
Mfr. Part No.MAX31855RASA+
BrandMaxim
$7.986
Each (In a Tube of 10)
units
Single SOIC Surface Mount 3.3 V 8 - No - -50 °C +1770 °C - - - 1500 μA
RS Stock No. 523-6412
Mfr. Part No.AD8221ARMZ
$9.47
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. 111-1154
Mfr. Part No.AD8221ARMZ
$7.271
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. 783-3891
Mfr. Part No.MAX31855RASA+
BrandMaxim
$7.99
Each
units
Single SOIC Surface Mount 3.3 V 8 - No - -50 °C +1770 °C - - - 1500 μA
RS Stock No. 252-1616
Mfr. Part No.INA126PA
$4.93
Each
units
Dual PDIP Through Hole 12 V, 15 V, 18 V, 24 V, 28 V, 3 V, 5 V, 9 V 8 ±15V No 0.5mV -40 °C +85 °C 1GΩ 74dB - 0.2 mA
RS Stock No. 369-6705
Mfr. Part No.INA126PA
$4.19
Each (In a Tube of 50)
units
Dual PDIP Through Hole 12 V, 15 V, 18 V, 24 V, 28 V, 3 V, 5 V, 9 V 8 ±15V No 0.5mV -40 °C +85 °C 1GΩ 74dB - 0.2 mA
RS Stock No. 779-9110
Mfr. Part No.LT1167CS8#PBF
$11.85
Each
units
Dual SOIC Surface Mount - 8 ±2.3 → ±18V - 60µV 0 °C +70 °C 1000GΩ 120dB 1MHz 1.3 mA
RS Stock No. 106-7014
Mfr. Part No.AD595CQ
$37.155
Each (In a Tube of 25)
units
Dual, Single CDIP Through Hole 5 V 14 ±15V - - -55 °C +125 °C - - 15kHz -
RS Stock No. 158-0523
Mfr. Part No.AD8295ACPZ-WP
$7.104
Each (In a Tray of 64)
units
Dual LFCSP Surface Mount - 16 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.12mV -40 °C +85 °C 100GΩ 80dB - -
RS Stock No. 779-9035
Mfr. Part No.LT1101SW#PBF
$21.12
Each
units
Dual, Single SOIC Surface Mount 5 V 16 ±15V - 800µV 0 °C +70 °C 12GΩ 96dB 33kHz 105 μA
RS Stock No. 697-7265
Mfr. Part No.AD8295ACPZ-WP
$8.50
Each
units
Dual LFCSP Surface Mount - 16 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.12mV -40 °C +85 °C 100GΩ 80dB - -
RS Stock No. 923-3533
Mfr. Part No.INA125P
$9.018
Each (In a Tube of 25)
units
Dual, Single PDIP Through Hole 5 V 16 ±15V - 0.25mV -55 °C +125 °C 100GΩ 78dB - -
RS Stock No. 912-7113
Mfr. Part No.AD620BNZ
$17.46
Each (In a Tube of 50)
units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 50µV -40 °C +85 °C 10GΩ 80dB 120kHz -