Minimizing power usage in medical monitors, wearable electronics, gas detectors, pH sensors, and more.

STMicroelectronics (ST) has launched the TSU111 nano-power operational amplifier with an average current of only 900nA in an ultra-small size of 1.2mm x 1.3mm.

This product helps minimize power consumption in analog circuits in products such as medical monitors, wearable electronics, gas detectors, pH sensors, infrared motion sensors, and payment tags.

The TSU111's operating current is so low that it's comparable to the leakage current of an inexpensive capacitor, requiring over 25 years to discharge a 220mAh CR2032 cell. Therefore, this op amp can be designed with minimal impact on overall system power management.

The TSU111 outperforms other nano-power op amps by ensuring high accuracy of signal conditioning circuits with an input offset voltage of 150uV and noise of 3.6µVp-p from 0.1Hz to 10Hz.

Additionally, it features an exceptional gain-bandwidth product (GBWP) of 11.5 kHz and a rail-to-rail input stage, enabling monitoring of environmental or biosignals. Its extremely low input bias current of 10 pA minimizes the effects of parasitic currents in sensing devices such as gas detectors or photodiodes.

The supply voltage range is 1.5 V to 5 V, and power is supplied from the same power rail as the logic circuit, simplifying power design and board layout. It also allows devices to operate longer before the battery is discharged by using minimal voltage, and is convenient for use in devices powered by energy harvesting systems such as photovoltaic (PV) cells.

The TSU111 is available now in the 1.2mm x 1.3mm DFN6 package or the 2mm x 2.1mm SC70-5 (SOT323-5) package, with pricing starting at $0.69 for orders of 1,000 pieces.