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. 160-4529
Mfr. Part No.AD8223ARMZ-R7
HK$22.276
Each (On a Reel of 1000)
units
Dual, Single MSOP Surface Mount 3 24 V 8 ±2 to ±12V Rail to Rail Output 250µV -40 °C +85 °C - 90dB 125kHz 500 μA
RS Stock No. 709-2078
Mfr. Part No.INA122U
HK$73.76
Each
units
Dual, Single SOIC Surface Mount 5 V 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V Rail to Rail Output 0.25mV -40 °C +85 °C 10GΩ 83dB - 0.085 mA
RS Stock No. 660-5248
Mfr. Part No.INA125U
HK$72.69
Each
units
Dual, Single SOIC Surface Mount 5 V 16 ±15V No 0.25mV -55 °C +125 °C 100GΩ 78dB - -
RS Stock No. 709-7089
Mfr. Part No.AD8220BRMZ
HK$92.16
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. 921-7011
Mfr. Part No.LM6144BIM/NOPB
HK$68.46
Each (In a Tube of 55)
units
Single SOIC Surface Mount 1.8 24 V 14 - - 1mV -40 °C +85 °C 126MΩ 107dB 18MHz -
RS Stock No. 427-288
Mfr. Part No.AD627BRZ
HK$88.05
Each
units
Dual, Single SOIC Surface Mount 7.5 V 8 ±15V Rail to Rail Output 0.15mV -40 °C +85 °C 20GΩ 83dB - 0.085 mA
RS Stock No. 796-9133
Mfr. Part No.AD5749ACPZ
HK$45.465
Each (In a Pack of 2)
units
Single LFCSP Surface Mount 12 55 V 32 - - - -40 °C +105 °C - - 50MHz -
RS Stock No. 121-9041
Mfr. Part No.INA131BP
HK$117.573
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 - 0.05mV -40 °C +85 °C 10GΩ 110dB - 3 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. 189-8832
Mfr. Part No.MAX4208AUA+
HK$29.62
Each (In a Pack of 5)
units
Dual, Single μMAX Surface Mount 2.85 → 5.5 V 8 ±1.425 to ±2.75V Rail to Rail Output 0.02mV -40 °C +125 °C 2GΩ 106dB 750kHz 3 mA
RS Stock No. 806-8026
Mfr. Part No.AD8496ARMZ
HK$57.74
Each
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. 884-7012
Mfr. Part No.LTC6915HGN#PBF
HK$62.735
Each (In a Pack of 2)
units
Dual, Single SSOP Surface Mount 2.7 V 16 ±5V Rail to Rail Input/Output ±10µV -40 °C +125 °C - 85dB 200kHz 1.3 (Parallel) mA, 1.65 (Serial) mA
RS Stock No. 923-6728
Mfr. Part No.INA122U
HK$67.706
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 0.25mV -40 °C +85 °C 10GΩ 83dB - 0.085 mA
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. 709-7082
Mfr. Part No.AD8221BRZ
HK$98.05
Each
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. 796-7981
Mfr. Part No.INA163UA
HK$68.74
Each
units
Dual SOIC Surface Mount - 14 ±18V No 250µV -40 °C +125 °C - 100dB 800kHz 12 μA
RS Stock No. 170-8128
Mfr. Part No.ISL28535FVZ-T7A
BrandIntersil
HK$46.358
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 3.5 mA
RS Stock No. 197-7473
Mfr. Part No.PGA205AP
HK$166.67
Each
units
Dual PDIP Through Hole ±18 V 16 - No - - - - - 1MHz -
RS Stock No. 168-4168
Mfr. Part No.AD622ARZ-R7
HK$60.436
Each (On a Reel of 750)
units
Dual SOIC Surface Mount - 8 ±2.6 → ±15V No 0.125mV -40 °C +85 °C 10GΩ 66dB 1MHz 1.5 mA
RS Stock No. 189-7745
Mfr. Part No.MAX31855KASA+
HK$42.767
Each (In a Tube of 100)
units
Single SOIC Surface Mount 3.3 V 8 - No - -200 °C +1350 °C - - - 1500 μA