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. 145-6995
Mfr. Part No.AD5750-1ACPZ
R 66.213
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. 121-6905
Mfr. Part No.AD8429BRZ
R 195.476
Each (In a Tube of 98)
units
Dual SOIC Surface Mount - 8 ±4 ±18V - 50µV -40 °C +125 °C 10kΩ 140dB 15MHz 9 mA
RS stock no. 197-7151
Mfr. Part No.INA125P
R 96.205
Each (In a Tube of 25)
units
Dual PDIP Through Hole ±15 V 16 - - ±250µV - - - - - -
RS stock no. 158-0238
Mfr. Part No.AD8225ARZ
R 105.742
Each (In a Tube of 98)
units
Dual, Single SOIC Surface Mount 3.4 36 V 8 ±1.7 ±18V No 0.375mV -40 °C +85 °C 10GΩ 86dB - 1.2 mA
RS stock no. 912-8249
Mfr. Part No.AD8231ACPZ-WP
R 58.85
Each (In a Tray of 64)
units
Dual, Single LFCSP Surface Mount 5 V 16 - Rail to Rail Output 0.015mV -40 °C +125 °C 10GΩ 80dB 7MHz -
RS stock no. 660-5395
Mfr. Part No.INA2141UA
R 239.71
Each
units
Dual SOIC Surface Mount - 16 ±15V No 0.25mV -40 °C +85 °C 10GΩ 93dB - 1.6 mA
RS stock no. 197-7157
Mfr. Part No.INA126UA
R 54.30
Each (In a Pack of 5)
units
Dual SOIC Surface Mount ±15 V 8 - - 250µV - - - - - -
RS stock no. 806-8017
Mfr. Part No.AD8494CRMZ
R 167.545
Each (In a Pack of 2)
units
Dual, Single MSOP Surface Mount 2.7 36 V 8 ±2.7 ±18V - - -40 °C +125 °C 60kΩ - 30kHz 250 μA
RS stock no. 884-6769
Mfr. Part No.LT1789IS8-1#PBF
R 151.39
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
RS stock no. 538-7217
Mfr. Part No.AD8225ARZ
R 132.76
Each
units
Dual, Single SOIC Surface Mount 3.4 36 V 8 ±1.7 ±18V No 0.375mV -40 °C +85 °C 10GΩ 86dB - 1.2 mA
RS stock no. 197-7145
Mfr. Part No.INA121PA
R 102.44
Each (In a Pack of 2)
units
Dual PDIP Through Hole ±15 V 8 - - ±1000µV - - - - - -
RS stock no. 190-1414
Mfr. Part No.MAX31855KASA+
R 109.365
Each (In a Pack of 2)
units
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1350 °C - - - 1500 μA
RS stock no. 796-7981
Mfr. Part No.INA163UA
R 125.82
Each
units
Dual SOIC Surface Mount - 14 ±18V No 250µV -40 °C +125 °C - 100dB 800kHz 12 μA
RS stock no. 923-3537
Mfr. Part No.INA125U
R 106.446
Each (In a Tube of 40)
units
Dual, Single SOIC Surface Mount 5 V 16 ±15V - 0.25mV -55 °C +125 °C 100GΩ 78dB - -
RS stock no. 660-4857
Mfr. Part No.INA2332AIPWT
R 46.29
Each
units
Single TSSOP Surface Mount 3 V, 5 V 14 - Rail to Rail Output 8mV -55 °C +125 °C 10000GΩ 60dB - -
RS stock no. 158-5252
Mfr. Part No.AD524CDZ
R 1,138.068
Each (In a Tube of 23)
units
Dual CDIP Through Hole - 16 ±15V No 0.05mV -40 °C +85 °C 1GΩ 80dB 25MHz -
RS stock no. 461-6520
Mfr. Part No.INA118UB
R 220.28
Each
units
Dual SOIC Surface Mount - 8 ±15V No 50µV -40 °C +125 °C 10GΩ 80dB 800kHz 0.385 mA
RS stock no. 660-4866
Mfr. Part No.INA327EA/250
R 89.12
Each
units
Single MSOP Surface Mount 3 V, 5 V 10 - Rail to Rail Input/Output 0.1mV -40 °C +85 °C 10GΩ 100dB - -
RS stock no. 709-6058
Mfr. Part No.AD624BDZ
R 1,131.62
Each
units
Dual SBCDIP Through Hole - 16 ±15V No 0.075mV -25 °C +85 °C 1GΩ 75dB 25MHz -
RS stock no. 121-7255
Mfr. Part No.ISL28635FVZ-T7A
BrandIntersil
R 46.51
Each
units
Dual, Single TSSOP Surface Mount 2.5 → 5.5 V 14 ±1.25 → ±2.75V Rail to Rail Input/Output 10µV -40 °C +125 °C - 80dB 3MHz 3.6 mA