TSU11x series

TSU11 series: nanopower op amps for battery-powered and energy-harvesting applications

With ultralow power consumption and high accuracy, the single-channel TSU111, dual-channel TSU112, and quad-channel TSU114 operational amplifiers for industrial and automotive applications offer 900 nA ultralow power consumption per channel and 1.2 µA maximum when supplied 3.3 V.

The high 150 µV max. accuracy and 11.5 kHz gain bandwidth render the TSU11 ideal for sensor signal conditioning, battery operated, and portable applications. This product family is supplied by a coin type lithium battery or a regulated voltage in low-power applications.

Key features

10 year longevity
st op amps
  • Rail-to-rail input and output
  • Sub-micro ampere current consumption:
    • lcc = 900 nA typ. at 25°C
    • Icc = 920 nA typ. at 25°C for automotive version
  • Low offset voltage:
    • 150 µV max. at 25°C, 235 µV max over full temperature range (-40 to 85°C)
    • 150 µV max. at 25°C, 400 µV max over full temperature range (-40 to 125°C) for automotive version
    • 250 µV max. at 25 °C, 600 µV max. over full temperature range (-40 to 150°C) for High temperature version
  • Low noise over 0.1 to 10 Hz bandwidth: 3.6 µVpp
  • Low supply voltage: 1.5 V to 5.5 V
  • Gain bandwidth product: 11.5 kHz typ.
  • AEC-Q100 qualified

Application examples


  • Gas sensors: CO, O2, and H2S
  • Alarms: PIR sensors
  • Signal conditioning for energy harvesting and wearable products
  • Ultralong-life battery-powered applications
  • Battery current sensing
  • Active RFID tags

TSU111IY/112IY and TSU111H

  • Battery management system
  • On-board chargers (OBC)
  • Wireless chargers

Recommended resources

steval cca058v1

Easy-to-use setup for experimenting and learning with low-frequency op amp-based applications and common op amp-based schematics.


Design your analog circuit, get a quick preview with fully annotated schematic and BOM and then run the electrical simulation through eDSim for fast and accurate simulations and reliable design validation.

op amp reference guide

Download this very practical PDF resource covering:

  • How to choose the right op amp for an application
  • Typical op amp applications and key parameters
  • Step-by-step op amp selection using the ST Op Amps App
  • Op amp naming convention glossary
op amp finder app

A user-friendly product selector ensuring a smooth and simple navigation experience. It features a parametric search engine that lets you rapidly identify the best operational amplifier, comparator, or other signal conditioning devices for your application. Available on Google Play, App Store and Wandoujia.

p nucleo ika02a1

The STM32 Nucleo gas expansion board interfaces electrochemical sensors with the MCU on the STM32 Nucleo development board. Two TSU111 operational amplifiers provide signal conditioning.