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ST’s New Tiny Nano-Power OpAmp Boosts Sensing Accuracy Consuming Bare Minimum Power

TSU111

STMicroelectronics now matches energy needs of analog circuits in a smaller footprint for medical monitors, wearable electronics, gas detectors, pH sensors, infrared motionsensors and payment tags. Dubbed as TSU111 nano-power opamp, the new device come in tiny 1.2mm x 1.3mm outline and showcases typical current of only 900nA.

Key Nuggets Include

  • The TSU111’s extremely low operating current is on par with the leakage current of some low-cost capacitors, and would take over 25 years to discharge a 220mAh CR2032 cell. Hence the opamp can be designed-in with negligible impact on overall system energy management.
  • At the same time, the TSU111 outperforms other nano-power opamps with its input-offset voltage of 150uV and 0.1-10Hz noise of 3.6µVp-p that ensure high accuracy in signal-conditioning circuits.
  • In addition, the superior gain-bandwidth product (GBWP) of 11.5kHz and the rail-to-rail input stage enable monitoring of environmental or biological signals.
  • The very low input bias current of 10pA helps minimize the effects of parasitic currents in sensing devices like gas detectors or photodiodes.
  • The supply-voltage range of 1.5V to 5V allows the TSU111 to be powered from the same supply rail as logic circuitry thereby simplifying power-supply design and board layout.
  • Moreover, the low minimum voltage allows the device to run longer as the battery discharges, and simplifies use in equipment powered by energy-harvesting systems such as photovoltaic (PV) cells.

Availability, Packaging and Pricing

The TSU111 is available immediately in the 1.2mm x 1.3mm DFN6 package or 2mm x 2.1mm SC70-5 (SOT323-5), priced from $0.69 for orders of 1000 pieces.

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