オペレーショナル・アンプリファイア(オペアンプ)は、アナログ・シグナル・コンディショニング・アプリケーションで重要な役割を果たします。1941年にKarl Dale Swartzel Jr.氏によって発明されたこの製品は、幅広い電子機器に使用されています。

また、Industry 4.0を目指す産業アプリケーションにとってきわめて重要な役割を担っていますが、電動化への移行を目指す自動車業界にとっても非常に重要です。





  • ACおよびDC信号増幅
  • バッファリング
  • 駆動信号
  • ゲインおよびレベル・シフティング
  • フィルタリング
  • 演算の実行


  • 最小600nAの超低消費電流を実現したマイクロパワー・オペアンプの製品ポートフォリオを提供
  • 信頼性の高い業界標準オペアンプおよび高性能オペアンプの大量供給が可能
  • CSP / DFN / QFN / SOT-23 / SC-70などのパッケージで実装面積の小型化






  • 低消費電力オペアンプ


  • 高精度オペアンプ


  • 低入力バイアス電流オペアンプ


  • レール・ツー・レール・オペアンプ


  • 高電圧オペアンプ


  • 高速オペアンプ






TSZ181 超高精度、ゼロドリフト・オペアンプ

TSB712 6MHz高精度オペアンプ

TSB712 6MHz高精度レール・ツー・レール・オペアンプ





オペアンプ - クイック・リファレンス・ガイド(PDF)


  • アプリケーションに適したオペアンプの選択方法
  • オペアンプの主な用途とパラメータ
  • STのオペアンプ・アプリケーションを使ってオペアンプを選択
  • STのオペアンプの命名規則
  • 用語



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

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

The TSV771 and TSV772 are a single and dual operational amplifier (op amp) ideal for low-side current measurement, combining high accuracy and low power consumption.

Enlarging ST’s high-performance 5V op-amp family, the devices feature 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 in a very small 2.0mm x 2.0mm DFN8 package.

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,  TSV7722IY 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, TSV7722IY and TSV7723 (feat. shutdown option) are the perfect choice for low-side current sensing in industrial and automotive contexts.

Questions / Answers around Op-Amps

What is op-amp 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 op-amp 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.

input offset voltage
Low input offset voltage VIO is key for high precision

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 of an operational amplifier?

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 for an op-amp?

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.


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


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