The EL8171 and EL8172 are micropower instrumentation amplifiers optimized for single supply operation over the +2. 4V to +5. 5V range. Inputs and outputs can operate rail-to-rail. As with all instrumentation amplifiers, a pair of inputs provide very high common-mode rejection and are completely independent from a pair of feedback terminals. The feedback terminals allow zero input to be translated to any output offset, including ground. A feedback divider controls the overall gain of the amplifier. The EL8172 is compensated for a gain of 100 or more, and the EL8171 is compensated for a gain of 10 or more. The EL8171 and EL8172 have PMOS input devices that provide sub-nA input bias currents. The amplifiers can be operated from one lithium cell or two Ni-Cd batteries. The EL8171 and EL8172 input range goes from below ground to slightly above positive rail. The output stage swings completely to ground (ground sensing) or positive supply - no pull-up or pull-down resistors are needed.


  • 95µA maximum supply current
  • Maximum input offset voltage
  • 300µV (EL8172)
  • 1500µV (EL8171)
  • 50pA maximum input bias current
  • 450kHz -3dB bandwidth (G = 10)
  • 170kHz -3dB bandwidth (G = 100)
  • Single supply operation
  • Input voltage range is rail-to-rail
  • Output swings rail-to-rail
  • Ground sensing
  • Pb-free (RoHS compliant)




  • Battery- or solar-powered systems
  • Strain gauges
  • Current monitors
  • Thermocouple amplifiers


Design & Development