ST's operational amplifier portfolio provides a unique choice of high performance, low power, precision op-amps and tiny packages.
Why choosing ST's op-amps?
Free Webinar Op-Amps: Precision in small signal amplification
Get instant access for free to our recorded webinar (50 minutes), covering:
- Operational amplifier basics
- The key op-amp parameters affecting precision
- Zero-Drift vs. standard precision amplifiers - pros and cons
- ST operational amplifier product line and featured products
- Other key op-amp parameters
Wide range of operational amplifiers
Discover our ever-increasing range of op-amps designed to the challenging industrial, automotive and consumer markets.
Operational amplifiers with exceptionally low current consumption, enabling longer battery life and designed for a large diversity of applications.
ST's precision op-amp solutions include zero drift amplifiers and amplifiers with a low offset drift over temperature. They are a perfect fit for use with any sensor, including gas, temperature, pressure and position sensors.
Our portfolio is a perfect fit for any application where small differences in the input current or input voltage need to be measured accurately.
Operational amplifiers with low offset voltage are ideal for any application requiring high precision.
Our rail-to-rail operational amplifier portfolio includes several series covering different voltage ranges, as well as many possible combinations of power consumption and gain bandwidth.
Featuring an extended supply voltage range from 2.5 up to 36 V, our high-voltage series simplify the design of a wide variety of automotive and industrial applications: filters, power supply and motor control, actuator driving, hall effect sensors and resistive transducers.
ST offers a portfolio of high-end, high-speed operational amplifiers.
For Automotive applications
Discover our automotive-grade op-amp portfolio featuring extreme reliability and quality demanded by automotive applications.See all Automotive op-amps
ST's op-amp series at a glance
The P-NUCLEO-IKA02A1 pack is a ready to use CO detector including an STM32 Nucleo expansion board based on two TSU111 Op Amps and a Figaro TGS5141 CO sensor
Questions / Answers around Op-Amps
What is offset voltage?
When a zero differential input voltage is applied, the op-amp output voltage should be zero. In practice, this is not the case. The offset voltage by definition is the differential input voltage that is required to make the output voltage zero.
What is input offset voltage?
The input offset voltage parameter, generally called VIO, is defined as a DC voltage between the non-inverting and the inverting input. It is always specified in the electrical characteristics of a datasheet. It can be positive or negative.
The VIO value will be different for each op-amp. And to ensure good precision, it is important to choose the op-amp with the lowest VIO, because the VIO will be amplified by the gain and added to the total output voltage as an error.
Some op-amps with a chopper architecture like ST's TSZ121 exhibit a VIO of 5 µV. They are especially good for precision DC measurements.
What is input bias current?
Input bias current (IB) is the current flowing through an op-amp's inputs. Due to op-amp biasing requirements and normal operation leakage, a very small amount of current (pA or nA range, depending on the technology) is flowing through its inputs. This can cause issues when large value resistors or sources with higher output impedances are connected at the op-amp inputs. This leads to relevant voltage drops at the op-amp input and therefore errors.
What do rail-to-rail input and output mean?
An op-amp with a high rail input is able to deal with input signals up to +VCC. While a low rail input is able to deal with signals down to -VCC. Rail-to-rail input op-amps can handle input signals from -VCC to +VCC. Rail-to-rail output is the capability of an op-amp to drive its output very close to the power supply rails.