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. 165-4166
Mfr. Part No.MCP6N16-100E/MS
BrandMicrochip
HK$14.469
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. 923-2379
Mfr. Part No.INA131AP
HK$85.271
Each (In a Tube of 50)
units
Dual, Single PDIP Through Hole 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±15V - 0.125mV -40 °C +85 °C 10GΩ 106dB - 3 mA
RS Stock No. 813-6558
Mfr. Part No.INA826AID
HK$28.036
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
RS Stock No. 311-552
Mfr. Part No.PGA204AP
HK$168.91
Each
units
Dual PDIP Through Hole - 16 ±15V No 125µV -40 °C +85 °C 10GΩ 75dB 1MHz 7.5 mA
RS Stock No. 102-5658
Mfr. Part No.INA331IDGKT
HK$17.157
Each (On a Reel of 250)
units
Single MSOP Surface Mount 3 V, 5 V 8 - Rail to Rail Output 0.5mV -55 °C +125 °C 10000GΩ 90dB - -
RS Stock No. 522-9717
Mfr. Part No.AD620ANZ
HK$101.08
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. 796-8874
Mfr. Part No.AD8421BRMZ
HK$99.61
Each
units
Dual, Single MSOP Surface Mount 5 36 V 8 ±2.5 ±18V Rail to Rail Input 25µV -40 °C +125 °C 4kΩ 100dB 10MHz 2.6 mA
RS Stock No. 851-6884
Mfr. Part No.LTC2053HMS8#PBF
HK$85.61
Each
units
Dual, Single MSOP Surface Mount 2.7 → 6 V 8 ±5.5V Rail to Rail Output ±10µV -40 °C +125 °C - 116dB 200kHz 1 mA
RS Stock No. 111-1154
Mfr. Part No.AD8221ARMZ
HK$44.657
Each (In a Tube of 50)
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. 523-6248
Mfr. Part No.AD623ARMZ
HK$41.94
Each
units
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. 921-2892
Mfr. Part No.INA826AID
HK$23.814
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. 923-2284
Mfr. Part No.INA114AU
HK$95.578
Each (In a Tube of 40)
units
Dual SOL Surface Mount - 16 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V - 125µV -40 °C +85 °C 10GΩ 110dB 1MHz 3 mA
RS Stock No. 647-643
Mfr. Part No.INA110KP
HK$160.83
Each
units
Dual PDIP Through Hole - 16 ±15V No 500µV -25 °C +85 °C 5000GΩ 106dB 2.5MHz 4.5 mA
RS Stock No. 523-6412
Mfr. Part No.AD8221ARMZ
HK$56.76
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. 461-6542
Mfr. Part No.INA129UA
HK$82.75
Each
units
Dual SOIC Surface Mount - 8 ±15V No 125µV -40 °C +85 °C 100GΩ 73dB 1.3MHz -
RS Stock No. 461-6508
Mfr. Part No.INA103KU
HK$105.48
Each
units
Dual SOIC Surface Mount - 16 ±15V No 0.25mV -40 °C +85 °C 0.06GΩ 100dB 6MHz -
RS Stock No. 732-8406
Mfr. Part No.MAX4208AUA+
HK$29.62
Each
units
Dual, Single μMAX Surface Mount 2.85 → 5.5 V 8 ±1.425 → ±2.75V Rail to Rail Output 0.02mV -40 °C +125 °C 2GΩ 106dB 750kHz 3 mA
RS Stock No. 522-9739
Mfr. Part No.AD621ANZ
HK$121.93
Each
units
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. 183-1716
Mfr. Part No.AD620ARZ-REEL7
HK$57.875
Each (On a Reel of 750)
units
Dual SOIC Surface Mount - 8 ±2.3 to ±18V - 125µV -40 °C +85 °C - 110dB 1MHz 1.3 mA
RS Stock No. 121-9396
Mfr. Part No.PGA280AIPW
HK$64.596
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