STMicroelectronics TSU111 nano-power op amp

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With its 1.2 x 1.3 mm outline and typical current of 900 nA, the TSU111 nano-power op amp from STMicroelectronics helps cut the size and energy needs of analog circuits to the bare minimum in medical monitors, wearable electronics, gas detectors, pH sensors, infrared motion sensors and payment tags.

The product’s low operating current is on par with the leakage current of some capacitors, and would take over 25 years to discharge a 220 mAh CR2032 cell. Hence, the op amp can be designed-in with negligible impact on overall system energy management.

At the same time, the device is said to outperform other nano-power op amps with its input-offset voltage of 150 µV and 0.1–10 Hz noise of 3.6 µVp-p, ensuring good performance in signal-conditioning circuits.

In addition, the gain-bandwidth product (GBWP) of 11.5 kHz and the rail-to-rail input stage enable monitoring of environmental or biological signals. The low input bias current of 10 pA helps minimise the effects of parasitic currents in sensing devices like gas detectors or photodiodes.

The supply-voltage range of 1.5 to 5 V allows the product 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.

For more information: www.st.com/tsu111-pr.