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Operational Amplifiers (Op Amps)

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Operational amplifiers, known also as op amps, play a major role in analog signal conditioning applications. Invented by Karl Dale Swartzel Jr. in 1941, these products are largely used in today’s electronic devices.

They are key enablers for industrial applications towards industry 4.0 and for automotive customers on their transition to electrification.

st op amps

ST's operational amplifier portfolio provides a unique choice of high performance, low-power, precision op amps and tiny packages.
It addresses voltages from 1.5 to 44 V and operating temperatures from -40 to 175°C.

What are op amps used for and why you should choose ST’s op amps

Operational amplifiers are primarily used for:

  • AC and/or DC signal amplification
  • Buffering
  • Driving signals
  • Gain and level shifting
  • Filtering
  • Performing mathematical operations

But there is more, by choosing our products you also benefit from:

  • Largest micropower op amp portfolio on the market, with consumption as low as 600 nA
  • High volume supplier of highly reliable standard and high-performance op amps
  • Space-saving packages including CSP, DFN, QFN, SOT-23 and SC-70
Free Webinar

 

Operational amplifiers: New current sensing solutions for industrial systems

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Types of operational amplifiers

Each application has a suitable operational amplifier: Discover our ever-increasing range of op amps designed for the challenging industrial, automotive and consumer markets.

10 year longevity program
  • Low power op amps

    Operational amplifiers with exceptionally low current consumption, enabling longer battery life and designed for a large diversity of applications.

  • Precision op amps

    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.

  • Low input bias current op amps

    Our portfolio is a perfect fit for any transimpedance usage or when dealing with high impedance sensors.

  • Rail-to-rail op amps

    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.

  • High voltage op amps

    Featuring an extended supply voltage range from 2.7 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.

  • High speed op amps

    ST offers a portfolio of high-end, high-speed operational amplifiers.

Featured Op Amps

tsv792 high speed op amp

TSV792 High-Bandwidth, Low-Offset, Rail-to-Rail Op Amp

tsz181h zero drift op amp

TSZ181H Ultra-High Accuracy, Zero Drift Op Amp

tsb712 6 mhz precision op amp

TSB712 6 MHz, Precision, Rail-to-Rail Op Amp

Op amps for Automotive Applications

automotive op amps

Discover our automotive-grade op-amp portfolio featuring extreme reliability and quality demanded by automotive applications.

See all Automotive op amps

Op Amps - Quick Reference Guide (PDF)

Download this very practical PDF resource covering:

  • How do I pick the right op amp for an application?
  • Typical op-amp applications and key parameters
  • Step-by-step op-amp selection using the ST Op Amps App
  • ST's op-amp naming convention
  • Glossary

 

ST's op amps series at a glance

operational amplifier portfolio
Fast and powerful electrical simulation software for SMPS and analog ICs
Training kit for operational amplifiers and comparators

New 20MHz, low-offset op amp in high-performance 5V family

The TSV772 is a dual operational amplifier (op amp) combining high accuracy, low power consumption, and the option of a very small 2.0mm x 2.0mm DFN8 package.

Enlarging ST’s high-performance 5V op-amp family, the device features also rail-to-rail inputs / outputs, 20MHz gain-bandwidth (GBW), and is unity-gain stable. With a slew rate of 13V/µs, 7nV/√Hz input noise density, and 4kV ESD capability (HBM), the TSV772 is a strong all-round performer.

Automotive grade version is also available.

High bandwidth and low offset 5 V op amps for Industrial and Automotive

ST enlarges its 5V Op-Amp portfolio with the new TSV7722 and TSV7723  dual high-performance operational amplifiers.
Boasting a gain bandwidth product of 22MHz, an input offset voltage of 50µV, and a wide supply voltage range, the TSV7722 and TSV7723 (feat. shutdown option) are the perfect choice for low-side current sensing in industrial and automotive contexts.

Automotive grade version is also available for TSV7722.

Questions / Answers

What are the main characteristics of ideal and real op amps?

Ideal op amp

Real op amp

Infinite bandwidth: all frequency signals are amplified without attenuation. Each op amp has its specific gain-bandwidth product: input frequency should not exceed this particular frequency range at the desired gain.
Infinite input impedance: in order not to affect upstream circuitry. Very high, but finite input impedance.
Zero output impedance: in order not to affect downstream circuitry. Very low, but not zero output impedance.

What are the main applications for op amps?

It can be easily said that op amps are present in almost all electrical devices and can be used for various applications, depending on the external components/circuitry or topology.

Differential amplifier (difference amplifier)

op amps differential amplifier circuit

Amplifies the difference in voltage between its inputs.

Inverting amplifier

op amps inverting amplifier circuit

An inverting amplifier is a special case of the differential amplifier producing an output which is 180° out of phase with respect to its input.

Non-inverting amplifier

op amps non inverting amplifier circuit

In this case, the output voltage is always in phase with the input voltage, which is why this topology is known as non-inverting.

Voltage follower (unity buffer amplifier)

op amps voltage follower circuit

This circuit does not generally require external components, and provides high input impedance and low output impedance, which makes it a useful buffer.

eDesignSuite

eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.

Signal Conditioning Design Tool

Choose design tool:

Active Filters

Handles multi-stage-designs and common topologies
Returns circuit component values
Provides gain, phase and group delay graphs
Low Pass, High Pass and Band Pass

Comparators

Handles most common configurations
Returns circuit components values
Provides I/O signal waveforms
Inverting, Non Inverting, Window

Current Sensing

Returns circuit component values
Provides current error graphs