Automotive-qualified micro-power op amp has extended mission profile

Equipped with micro-power current consumption and 150 degrees C operating temperature capability, STMicroelectronics believes the TSU111H 5V automotive operational amplifier combines properties that are unusual to find in a single device.

It is qualified to AEC-Q100 temperature Grade 0 (-40 to +150 degrees C) and is able to withstand environments that experience extreme heat, such as in braking systems, combustion engine exhaust systems and fuel cell generators. The high maximum temperature enables use inside sensor control units placed close to sensors installed in the hottest areas to optimise measurement accuracy.

In less extreme environments the TSU111H’s extended temperature range allows a mission profile up to three times longer than an equivalent Grade-1 device qualified at +125 degrees C. As a Grade-0 device, the op amp can operate continuously at 65 degrees C for more than 25 years, thereby serving the entire vehicle lifetime, said ST. Grade-1 devices are specified for eight years without failure. The op amp is suitable for applications such as the battery-management system (BMS) of hybrid and electric vehicles, which is never turned off and must consume the least possible power. 

The typical supply current of 1.7 microA ensures the TSU111H places minimal load on the vehicle electrical supply. The output voltage is exact to within 250 microV at 25 degrees C, and 600 microV over the full temperature range, ensuring high accuracy signal conditioning in all applications and operating conditions, according to ST. A typical use case is to enable precision measurements in the vehicle’s on-board charger.

The TSU111H is in production now, housed in a SOT23-5L package. It is included in ST’s 10-year longevity program that ensures long-term product availability for automotive and industrial projects. Free samples are available now on the ST eStore.

STMicroelectronics is exhibiting at Embedded World 2023 – 4A-148.

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