Robust 36V op amps offer stability & efficiency in automotive, industrial

April 05, 2016 // By Graham Prophet
STMicroelectronics has introduced two 36V op amps that deliver enhanced performance and ruggedness in automotive and industrial applications. They claim a wide supply-voltage range, stability in challenging operating conditions, and tolerance of electrostatic discharge up to 4kV.

The TSB572 and TSB611 single op amps are the first devices produced using ST's 40V-ready BiCMOS semiconductor process. This technology delivers superior GBW/Icc (Gain-bandwidth per input current, a measure of op-amp performance realtive to power consumption) efficiency resulting in about five times lower supply current in relation to performance, compared with standard op amps. Low input-offset voltages with temperature drift below 6µV/°C simplify system design, eliminate any need for trimming or calibration, and ensure consistent performance over the specified temperature range -40°C to 125°C.


The TSB572, with rail-to-rail inputs and output, has 2.5 MHz gain-bandwidth (GBW) and 1.5 mV maximum input-offset voltage. The op amp is stable with capacitive loads and highly resistant to phase reversal. Its broad supply-voltage range, from 4.0V to 36V, allows reliance on specified parameters with a wide variety of power supplies.


The TSB611 has 560 kHz GBW and can operate from a supply voltage as low as 2.7V. It is a unity-gain-stable device, and has extremely low input-offset voltage of 1 mV as well as operating current of 125 µA (max.) at 36V. Compact package options suit these op amps ideal for use where space is tight, such as in automotive audio systems and Electronic Control Units (ECUs).


The TSB572 in 3 x 3 mm DFN or Mini-SO8, is priced from $0.80. The TSB611 in SOT23-5 is priced from $0.55 (both 1000).