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. 923-5570
Mfr. Part No.MAX6675ISA+
HK$66.253
Each (In a Tube of 100)
units
Single SOIC Surface Mount 3 5.5 V 8 - No - -20 °C +85 °C - - - 1.5 mA
RS Stock No. 660-4872
Mfr. Part No.INA337AIDGKT
HK$37.27
Each
units
Single MSOP Surface Mount 3 V, 5 V 8 - No 0.1mV -40 °C +125 °C 10GΩ 106dB - -
RS Stock No. 759-0020
Mfr. Part No.AD8226BRMZ
HK$38.96
Each
units
Dual, Single MSOP 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. 160-1743
Mfr. Part No.AD8496ARMZ
HK$39.53
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 - 31kHz 250 μA
RS Stock No. 170-8131
Mfr. Part No.ISL28635FVZ-T7A
BrandIntersil
HK$46.55
Each (On a Reel of 250)
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
RS Stock No. 709-7089
Mfr. Part No.AD8220BRMZ
HK$79.41
Each
units
Dual, Single MSOP Surface Mount 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V Rail to Rail Output 0.2mV -40 °C +85 °C - 80dB - -
RS Stock No. 197-7143
Mfr. Part No.INA118P
HK$102.76
Each
units
Dual PDIP Through Hole 18 V 8 - - ±125µV - - - - - -
RS Stock No. 661-2485
Mfr. Part No.INA141UA
HK$85.23
Each
units
Dual SOIC Surface Mount - 8 ±15V No 0.125mV -40 °C +85 °C 10GΩ 93dB - 0.8 mA
RS Stock No. 538-7217
Mfr. Part No.AD8225ARZ
HK$66.49
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. 506-0293
Mfr. Part No.LT1167ACS8#PBF
HK$107.85
Each
units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.04mV 0 °C +70 °C 1000GΩ 90dB 1MHz 1.3 mA
RS Stock No. 660-4835
Mfr. Part No.INA155E/250
HK$32.36
Each
units
Single MSOP Surface Mount 3 V, 5 V 8 - Rail to Rail Output 1mV -65 °C +150 °C 10000GΩ 92dB - -
RS Stock No. 160-3355
Mfr. Part No.AD524CD
HK$681.118
Each (In a Tube of 23)
units
Dual SBDIP Through Hole - 16 ±15V - 50µV -40 °C +85 °C 10GΩ 120dB 25MHz 10 nA, 15 nA
RS Stock No. 778-5105
Mfr. Part No.AD8237ARMZ
HK$18.99
Each (In a Pack of 2)
units
Single MSOP Surface Mount 1.8 to 5.5 V 8 - Rail to Rail Input/Output 75µV -40 °C +125 °C - 106dB 6MHz 115 μA
RS Stock No. 912-7937
Mfr. Part No.AD8221BRZ
HK$66.23
Each (In a Tube of 98)
units
Dual SOIC Surface Mount - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.025mV -40 °C +125 °C 100GΩ 140dB 1.5MHz 1 mA
RS Stock No. 189-8812
Mfr. Part No.MAX4194ESA+
HK$33.678
Each (In a Pack of 5)
units
Dual, Single SOIC Surface Mount 2.7 7.5 V 8 ±1.35 to ±3.75V Rail to Rail Output 0.69mV -40 °C +85 °C 1GΩ 60dB 250kHz 0.00002 mA
RS Stock No. 545-5657
Mfr. Part No.LTC1043CN#PBF
HK$62.18
Each
units
- PDIP Through Hole - 18 - - - -40 °C +85 °C - - - -
RS Stock No. 400-970
Mfr. Part No.AD8231ACPZ-WP
HK$36.66
Each
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. 197-7177
Mfr. Part No.INA326EA/250
HK$31.54
Each (On a Reel of 250)
units
Single VSSOP Surface Mount 2.7 → 5.5 V 8 - - ±100µV - - - - 1kHz -
RS Stock No. 660-4415
Mfr. Part No.PGA204BP
HK$179.53
Each
units
Dual PDIP Through Hole - 16 ±15V No - -40 °C +85 °C 10GΩ 80dB - 7.5 mA
RS Stock No. 145-7405
Mfr. Part No.LT1167AIS8#PBF
HK$76.707
Each (In a Tube of 100)
units
Dual SOIC Surface Mount - 8 ±2.3 ±18V - 40µV -40 °C +85 °C 1000GΩ 126dB 1MHz 1.6 mA
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