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. 538-7217
Mfr. Part No.AD8225ARZ
PHP390.38
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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. 923-3549
Mfr. Part No.INA129P
PHP370.906
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Dual PDIP Through Hole - 8 ±15V - - -40 °C +85 °C 100GΩ 80dB - -
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Mfr. Part No.INA2141UA
PHP594.491
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Dual SOIC Surface Mount - 16 ±15V No 0.25mV -40 °C +85 °C 10GΩ 93dB - 1.6 mA
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Mfr. Part No.AD8226BRZ
PHP250.43
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Dual, Single SOIC Surface Mount 2.2 36 V 8 ±1.35 ±18V Rail to Rail Output 50µV -40 °C +125 °C 100kΩ 80dB 1.5MHz 350 μA
RS Stock No. 912-6132
Mfr. Part No.AD623BRZ
PHP334.698
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Dual, Single SOIC Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.1mV -40 °C +85 °C 2GΩ 77dB - -
RS Stock No. 159-8116
Mfr. Part No.AD8226BRZ
PHP202.20
Each (In a Tube of 98)
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Dual, Single SOIC Surface Mount 2.2 36 V 8 ±1.35 ±18V Rail to Rail Output 50µV -40 °C +125 °C 100kΩ 80dB 1.5MHz 350 μA
RS Stock No. 145-6919
Mfr. Part No.LTC1043CSW#PBF
PHP281.175
Each (In a Tube of 40)
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- SOIC W Surface Mount - 18 - - - -40 °C +85 °C - - - -
RS Stock No. 697-6962
Mfr. Part No.AD623BRZ
PHP378.53
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Dual, Single SOIC Surface Mount 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.1mV -40 °C +85 °C 2GΩ 77dB - -
RS Stock No. 100-3848
Mfr. Part No.INA129UA
PHP356.089
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Dual SOIC Surface Mount - 8 ±15V - 125µV -40 °C +85 °C 100GΩ 73dB 1.3MHz -
RS Stock No. 522-9739
Mfr. Part No.AD621ANZ
PHP645.25
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Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.25mV -40 °C +85 °C 10GΩ 93dB - -
RS Stock No. 252-1593
Mfr. Part No.INA125PA
PHP306.22
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Dual, Single PDIP Through Hole 5 V 16 ±15V No 0.5mV -55 °C +125 °C 100GΩ 72dB - -
RS Stock No. 427-288
Mfr. Part No.AD627BRZ
PHP470.60
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Dual, Single SOIC Surface Mount 7.5 V 8 ±15V Rail to Rail Output 0.15mV -40 °C +85 °C 20GΩ 83dB - 0.085 mA
RS Stock No. 923-3593
Mfr. Part No.PGA204BU
PHP852.537
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Dual SOIC Surface Mount - 16 ±15V - 50µV -40 °C +85 °C 10GΩ 80dB 1MHz 6.5 mA
RS Stock No. 806-7994
Mfr. Part No.AD8426ACPZ-WP
PHP301.35
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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. 912-8772
Mfr. Part No.AD627BRZ
PHP430.124
Each (In a Tube of 98)
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Dual, Single SOIC Surface Mount 7.5 V 8 ±15V Rail to Rail Output 0.15mV -40 °C +85 °C 20GΩ 83dB - 0.085 mA
RS Stock No. 121-6694
Mfr. Part No.AD8495ARMZ
PHP284.099
Each (In a Tube of 50)
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- - - - - - - - - - - - - -
RS Stock No. 912-6221
Mfr. Part No.AD8221ARZ
PHP258.308
Each (In a Tube of 98)
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Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.06mV -40 °C +125 °C 100GΩ 130dB 825kHz 1 mA
RS Stock No. 523-6248
Mfr. Part No.AD623ARMZ
PHP217.53
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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. 660-5395
Mfr. Part No.INA2141UA
PHP737.10
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Dual SOIC Surface Mount - 16 ±15V No 0.25mV -40 °C +85 °C 10GΩ 93dB - 1.6 mA
RS Stock No. 912-8154
Mfr. Part No.AD8422ARZ
PHP261.047
Each (In a Tube of 98)
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Dual, Single SOIC Surface Mount 3.6 36 V 8 ±1.8 ±18V Rail to Rail Output 60µV -40 °C +85 °C 10kΩ 80dB 2.2MHz 1 nA
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