Enhanced Product High Common Mode Voltage Difference Amplifier


Product details


Number of channels (#) 1 Vs (Min) (V) 2 Vs (Max) (V) 18 CMRR (Min) (dB) 84 Common mode input low (Min) (V) 275 Common mode input high (Max) (V) 500 Input offset (+/-) (Max) (uV) 3500 Iq (Typ) (mA) 0.81 Small signal bandwidth (Typ) (MHz) 0.5 Slew rate (Typ) (V/us) 5 Gain (Min) (V/V) 1 Gain (Max) (V/V) 1 Gain error (+/-) (Max) (%) 0.047 Rating HiRel Enhanced Product Operating temperature range (C) -55 to 125 Gain drift (Max) (ppm/C) 10 open-in-new Find other Difference amplifiers

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other Difference amplifiers


  • Common-Mode Voltage Range: ±275 V
  • Minimum CMRR: 84 dB from –55°C to +125°C
  • DC Specifications:
    • Maximum Offset Voltage: 3500 µV
    • Maximum Gain Error: 0.047%
    • Maximum Gain Nonlinearity: 0.001% FSR at 25°C
  • AC Performance:
    • Bandwidth: 500 kHz
    • Typical Slew Rate: 5 V/µs
  • Wide Supply Range: ±2.0 V to ±18 V
    • Maximum Quiescent Current: 1100 µA
    • Output Swing on ±15-V Supplies: ±13.5 V
  • Input Protection:
    • Common-Mode: ±500 V
    • Differential: ±500 V
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The INA149 is a precision unity-gain difference amplifier with a very high input common-mode voltage range. It is a single, monolithic device that consists of a precision op amp and an integrated thin-film resistor network. The INA149 can accurately measure small differential voltages in the presence of common-mode signals up to ±275 V. The INA149 inputs are protected from momentary common-mode or differential overloads of up to
500 V.

In many applications, where galvanic isolation in not required, the INA149 can replace isolation amplifiers. This ability can eliminate costly isolated input side power supplies and the associated ripple, noise, and quiescent current. The excellent 0.0005% nonlinearity and 500-kHz bandwidth of the INA149 are superior to those of conventional isolation amplifiers.

The INA149 is pin-compatible with the INA117 and INA148 type high common-mode voltage amplifiers and offers improved performance over both devices. The INA149 is available in the SOIC-8 package with operation specified over the military temperature range of –55°C to +125°C.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet High Common-Mode Voltage Difference Amplifier, INA149-EP datasheet (Rev. A) Apr. 02, 2012
* Radiation & reliability report INA149AMDREP Reliability Report May 07, 2012
E-book The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Selection guide TI Components for Aerospace and Defense Guide (Rev. E) Mar. 22, 2017
VID INA149-EP VID V6212614 Jun. 21, 2016
Technical articles Difference Amplifiers—the need for well-matched resistors Apr. 24, 2012

Design & development

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Hardware development


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SBOM667.TSC (164 KB) - TINA-TI Reference Design
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