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. 523-0212
Mfr. Part No.AD620ARZ
$14.22
Each
units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.125mV -40 °C +85 °C 10GΩ 73dB 120kHz -
RS Stock No. 285-8249
Mfr. Part No.INA122UA
$9.76
Each
units
Dual, Single SOIC Surface Mount 5 V 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V Rail to Rail Output 0.5mV -40 °C +85 °C 10GΩ 76dB - 0.085 mA
RS Stock No. 545-4957
Mfr. Part No.LTC1100CN8#PBF
$22.92
Each
units
Dual, Single PDIP Through Hole 9 V, 12 V, 15 V 8 ±3 V, ±5 V No 0.01mV 0 °C +70 °C - 90dB - 3.3 mA
RS Stock No. 912-8191
Mfr. Part No.AD8231ACPZ-R7
SGD993.93
Each (On a Reel of 1500)
units
Dual, Single LFCSP VQ Surface Mount 3 5 V 16 ±1.5 ±2.5V Rail to Rail Input/Output 15µV -40 °C +125 °C - 80dB 2.7MHz 100 pA, 500 pA
RS Stock No. 759-1281
Mfr. Part No.AD8227ARZ
$4.31
Each
units
Dual, Single SOIC 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
RS Stock No. 207-2388
Mfr. Part No.INA128PA
$12.95
Each
units
Dual PDIP Through Hole - 8 ±15V No 125µV -40 °C +85 °C 100GΩ 73dB 1.3MHz -
RS Stock No. 160-1742
Mfr. Part No.AD8494CRMZ
$12.09
Each (In a Tube of 50)
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. 100-3802
Mfr. Part No.INA122UA
$7.92
Each (In a Tube of 75)
units
Dual, Single SOIC Surface Mount 5 V 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V Rail to Rail Output 0.5mV -40 °C +85 °C 10GΩ 76dB - 0.085 mA
RS Stock No. 912-8249
Mfr. Part No.AD8231ACPZ-WP
$5.599
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. 912-8166
Mfr. Part No.AD8497CRMZ
$12.11
Each (In a Tube of 50)
units
Dual, Single MSOP Surface Mount 2.7 36 V 8 ±2.7 ±18V - - -40 °C +125 °C 60kΩ - 25kHz 250 μA
RS Stock No. 829-0557
Mfr. Part No.MCP6N16-001E/MS
BrandMicrochip
$3.10
Each (In a Pack of 5)
units
Single MSOP Surface Mount 1.8 5.5 V 8 - Rail to Rail Output 85µV -40 °C +125 °C 1kΩ 89dB 500kHz -
RS Stock No. 121-9396
Mfr. Part No.PGA280AIPW
$9.33
Each (In a Tube of 60)
units
Single TSSOP Surface Mount 40 V 24 - Rail to Rail Input/Output 250µV -40 °C +125 °C - 140dB 6MHz ±10 mA
RS Stock No. 912-6681
Mfr. Part No.AD621BRZ
$19.37
Each (In a Tube of 98)
units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.125mV -40 °C +85 °C 10GΩ 100dB - -
RS Stock No. 660-5248
Mfr. Part No.INA125U
$13.13
Each
units
Dual, Single SOIC Surface Mount 5 V 16 ±15V No 0.25mV -55 °C +125 °C 100GΩ 78dB - -
RS Stock No. 522-9256
Mfr. Part No.AMP02FPZ
$31.36
Each
units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±5 V, ±9 V No 0.2mV -40 °C +85 °C 16.5GΩ 75dB 1.2MHz 6 mA
RS Stock No. 111-1105
Mfr. Part No.AD625JNZ
$57.375
Each (In a Tube of 25)
units
Dual PDIP Through Hole - 16 ±12 V, ±15 V, ±9 V - 0.05mV 0 °C +70 °C 1GΩ 70dB 25MHz -
RS Stock No. 158-0238
Mfr. Part No.AD8225ARZ
$9.45
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. 806-5522
Mfr. Part No.AD623ARZ
$5.575
Each (In a Pack of 2)
units
Dual, Single SOIC Surface Mount 3 12 V 8 ±2.5 ±6V Rail to Rail Output 200µV -40 °C +85 °C - 90dB 800kHz 500 μA
RS Stock No. 160-4569
Mfr. Part No.AD8422ARMZ
$6.44
Each (In a Tube of 50)
units
Dual, Single MSOP Surface Mount 3.6 36 V 8 ±1.8 ±18V Rail to Rail Output 70µV -40 °C +85 °C 200GΩ 86dB 2.2MHz 1 nA
RS Stock No. 121-9392
Mfr. Part No.INA827AIDGK
$4.04
Each (In a Tube of 80)
units
Dual, Single VSSOP Surface Mount 2.7 to 36 V 8 ±1.35 to ±18V Rail to Rail Output 150µV -40 °C +125 °C - 88dB 600kHz 200 μA
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