Instrumentation Amplifiers

Instrumentation amplifiers (sometimes shortened to In-Amps) are a type of precision gain block used in electronic and measurement test equipment. Instrumentation amplifiers act as a differential amplifier; a type of electronic amplifier that amplifies the voltage difference between two inputs but suppresses any voltage signals that are common to the two inputs. RS Components offer a range of instrumentation amplifiers from several trusted brands in the industry, including Analog Devices, Microchip, Texas Instruments, and more.

How do instrumentation amplifiers work?

Instrumentation amplifiers are almost always composed of 3 op-amps (operational amplifiers) and several resistors. They provide the most important function of CMR (common-mode rejection) by cancelling out any signals that have the same potential as received by both of the inputs. Any signals that have different potentials get amplified. They are used for low frequency signals (such as <1MHz), which they amplify whilst also cutting out any common-mode noise that may be present in the input signal.

What are the instrumentation amplifiers used for?

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. 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.

Typical applications

  • Test & Measurement Industrial Devices
  • Data Acquisition Devices
  • Medical Devices

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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. 100-3844
Mfr. Part No.INA103KU
HK$93.083
Each (In a Tube of 40)
units
Dual SOIC Surface Mount - 16 ±15V - 0.25mV -40 °C +85 °C 0.06GΩ 100dB 6MHz -
RS Stock No. 709-5399
Mfr. Part No.AD621BRZ
HK$138.73
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 100dB - -
RS Stock No. 121-7254
Mfr. Part No.ISL28634FVZ-T7A
BrandIntersil
HK$71.77
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
RS Stock No. 461-6514
Mfr. Part No.INA114BU
HK$132.44
Each
units
Dual SOIC Surface Mount - 16 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V No 50µV -40 °C +85 °C 10GΩ 115dB 1MHz 3 mA
RS Stock No. 709-5531
Mfr. Part No.AMP04ESZ
HK$171.54
Each
units
Dual, Single SOIC Surface Mount 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±12 V, ±3 V, ±5 V, ±9 V No 0.15mV -40 °C +85 °C 4GΩ 90dB - 0.7 mA
RS Stock No. 522-9256
Mfr. Part No.AMP02FPZ
HK$185.79
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. 121-9392
Mfr. Part No.INA827AIDGK
HK$23.72
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
RS Stock No. 522-9098
Mfr. Part No.AD625JNZ
HK$238.63
Each
units
Dual PDIP Through Hole - 16 ±12 V, ±15 V, ±9 V No 0.05mV 0 °C +70 °C 1GΩ 70dB 25MHz -
RS Stock No. 121-9033
Mfr. Part No.INA2332AIPWT
HK$14.894
Each (On a Reel of 250)
units
Single TSSOP Surface Mount 3 V, 5 V 14 - Rail to Rail Output 8mV -55 °C +125 °C 10000GΩ 60dB - -
RS Stock No. 923-6683
Mfr. Part No.INA333AIDGKT
HK$31.091
Each (On a Reel of 250)
units
Dual, Single MSOP Surface Mount 1.8 5.5 V 8 ±0.9 ±2.75V Rail to Rail Output 0.025mV -40 °C +150 °C 100GΩ 80dB 150kHz 0.075 mA
RS Stock No. 170-8129
Mfr. Part No.ISL28633FVZ-T7A
BrandIntersil
HK$53.555
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. 660-4866
Mfr. Part No.INA327EA/250
HK$52.29
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
HK$759.22
Each
units
Dual SBCDIP Through Hole - 16 ±15V No 0.075mV -25 °C +85 °C 1GΩ 75dB 25MHz -
RS Stock No. 189-8812
Mfr. Part No.MAX4194ESA+
HK$37.822
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. 923-3537
Mfr. Part No.INA125U
HK$62.717
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. 761-6028
Mfr. Part No.LM6144BIM/NOPB
HK$89.29
Each
units
Single SOIC Surface Mount 1.8 to 24 V 14 - - 1mV -40 °C +85 °C 126MΩ 107dB 18MHz -
RS Stock No. 923-3662
Mfr. Part No.PGA202KP
HK$170.352
Each (In a Tube of 25)
units
Dual PDIP Through Hole - 14 ±15V - 2mV 0 °C +70 °C 10GΩ 80dB 1MHz -
RS Stock No. 806-7919
Mfr. Part No.AD8228ARMZ
HK$70.08
Each
units
Dual MSOP Surface Mount - 8 ±2.3 ±18V - 90µV -40 °C +85 °C 20kΩ 94dB 650kHz 1.2 mA
RS Stock No. 829-0551
Mfr. Part No.MCP6N16-010E/MS
BrandMicrochip
HK$19.142
Each (In a Pack of 5)
units
Single MSOP Surface Mount 1.8 5.5 V 8 - Rail to Rail Output 22µV -40 °C +125 °C 1kΩ 103dB 5MHz -
RS Stock No. 189-7744
Mfr. Part No.MAX31855JASA+
HK$44.207
Each (In a Tube of 100)
units
Single SOIC Surface Mount 3.3 V 8 - No - -40 °C +750 °C - - - 1500 μA