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. 912-9917
Mfr. Part No.AD8429ARZ
HK$54.973
Each (In a Tube of 98)
units
Dual SOIC Surface Mount - 8 ±4 → ±18V No 150µV -40 °C +125 °C 1.5GΩ 134dB 15MHz 7 mA
RS Stock No. 461-6520
Mfr. Part No.INA118UB
HK$145.14
Each
units
Dual SOIC Surface Mount - 8 ±15V No 50µV -40 °C +125 °C 10GΩ 80dB 800kHz 0.385 mA
RS Stock No. 100-3846
Mfr. Part No.INA118UB
HK$130.62
Each (In a Tube of 75)
units
Dual SOIC Surface Mount - 8 ±15V - 50µV -40 °C +125 °C 10GΩ 80dB 800kHz 0.385 mA
RS Stock No. 764-8747
Mfr. Part No.AD8429ARZ
HK$67.44
Each
units
Dual SOIC Surface Mount - 8 ±4 → ±18V No 150µV -40 °C +125 °C 1.5GΩ 134dB 15MHz 7 mA
RS Stock No. 923-5570
Mfr. Part No.MAX6675ISA+
HK$97.899
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. 698-7118
Mfr. Part No.MAX6675ISA+
HK$90.33
Each
units
Single SOIC Surface Mount 3 → 5.5 V 8 - No - -20 °C +85 °C - - - 1.5 mA
RS Stock No. 518-069
Mfr. Part No.EL8170FSZ
BrandIntersil
HK$21.554
Each (In a Pack of 5)
units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Input/Output 0.2mV -40 °C +125 °C - 90dB - 0.095 mA
RS Stock No. 111-2201
Mfr. Part No.AD627ANZ
HK$48.883
Each (In a Tube of 50)
units
Dual, Single PDIP Through Hole 7.5 V 8 ±15V Rail to Rail Output 0.25mV -40 °C +85 °C 20GΩ 77dB - 0.085 mA
RS Stock No. 523-8581
Mfr. Part No.AD627ANZ
HK$64.82
Each
units
Dual, Single PDIP Through Hole 7.5 V 8 ±15V Rail to Rail Output 0.25mV -40 °C +85 °C 20GΩ 77dB - 0.085 mA
RS Stock No. 252-1616
Mfr. Part No.INA126PA
HK$25.73
Each
units
Dual PDIP Through Hole 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±15V No 0.5mV -40 °C +85 °C 1GΩ 74dB - 0.2 mA
RS Stock No. 177-7115
Mfr. Part No.EL8170FSZ
BrandIntersil
HK$19.677
Each (In a Tube of 97)
units
Single SOIC Surface Mount 3 V, 5 V 8 - Rail to Rail Input/Output 0.2mV -40 °C +125 °C - 90dB - 0.095 mA
RS Stock No. 921-2892
Mfr. Part No.INA826AID
HK$18.312
Each (In a Tube of 75)
units
Dual, Single SOIC Surface Mount 2.7 → 36 V 8 ±1.35 → ±18V Rail to Rail Output 150µV -40 °C +125 °C - 80dB 1MHz 200 μA
RS Stock No. 121-6904
Mfr. Part No.AD8421ARMZ
HK$36.746
Each (In a Tube of 50)
units
Dual, Single MSOP Surface Mount 5 → 6 V 8 ±2.5 → ±18V - 60µV -40 °C +85 °C 20kΩ 134dB 10MHz 2.3 mA
RS Stock No. 301-779
Mfr. Part No.AD595AQ
HK$160.66
Each
units
Dual, Single CDIP Through Hole 5 V 14 ±15V No - -55 °C +125 °C - - 15kHz -
RS Stock No. 106-6379
Mfr. Part No.AD595AQ
HK$130.464
Each (In a Tube of 25)
units
Dual, Single CDIP Through Hole 5 V 14 ±15V - - -55 °C +125 °C - - 15kHz -
RS Stock No. 786-1017
Mfr. Part No.MAX31855KASA+
HK$42.38
Each
units
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1350 °C - - - 1500 μA
RS Stock No. 522-9717
Mfr. Part No.AD620ANZ
HK$95.45
Each
units
Dual PDIP Through Hole - 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 0.125mV -40 °C +85 °C 10GΩ 73dB 1MHz -
RS Stock No. 165-4166
Mfr. Part No.MCP6N16-100E/MS
BrandMicrochip
HK$13.02
Each (In a Tube of 100)
units
Single MSOP Surface Mount 1.8 → 5.5 V 8 - Rail to Rail Output 17µV -40 °C +125 °C 1kΩ 112dB 35MHz -
RS Stock No. 523-6412
Mfr. Part No.AD8221ARMZ
HK$49.20
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. 813-6558
Mfr. Part No.INA826AID
HK$23.808
Each (In a Pack of 5)
units
Dual, Single SOIC Surface Mount 2.7 → 36 V 8 ±1.35 → ±18V Rail to Rail Output 150µV -40 °C +125 °C - 80dB 1MHz 200 μA