過渡電圧サプレッサ（TVS）ダイオードとは
過渡電圧サプレッサ（TVS）は、過電圧をクランプし高過渡電力サージを抑制させるために特別に設計されたアバランシェ･ダイオードです。STのTransil™保護ダイオードは、短期間に高電流サージを短絡させることができます。
ソリッドステートで構成されるモノリシックなPN接合デバイスである過渡電圧サプレッサは、電気的オーバーストレス（EOS）や静電気放電（ESD）からの保護を確実にするため、影響を受けやすい半導体と一緒に並列保護構成で使用されます。
TVSダイオードは、経年劣化の影響を受けず、長期間の安定性と信頼性を誇るので、金属酸化膜バリスタ（MOV）と比べてより多くの利点があります。
品質と堅牢性が向上するTVSを用いた設計は、低直流電流で定格化されサージに対する規定がないツェナー･ダイオードを使用する設計よりも好まれます。
高性能TVSダイオード
STのTVS製品ポートフォリオでは、すべての規制要件および基準に準拠できるよう、産業用および車載用（AEC-Q101）バージョンで利用可能な独自の高性能デバイスを提供しています。
STの最新世代のTVSダイオードは、産業用および車載用アプリケーションの多様性に合わせて設計された、市場をリードする高い電力密度を提供しています。
TVS：お客様のさまざまなアプリケーション要件を満たす2つの動作モード
過渡電圧サプレッサには、以下の2つの異なる動作モードがあり、いずれかで動作します。
- 通常モード：デバイスはアプリケーションの通常動作時には動作しません（低リーク電流）
- サージ･サプレッション･モード：アプリケーションに過電圧が印可されると、デバイスはクランプ電圧値で過電圧をカット
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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.
Power Management Design Center
Thermal-electrical Simulators for Components
Signal Conditioning Design Tool
NFC/RFID Calculators
Choose design tool: 
SMPS design, by topology, by type and by product PFC design with analog and digitial control Supports various PCB configurations 
Handles AC-DC and DC-DC design in common topologies Displays interactive and annotated schematic Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data 
Provides a step-by-step optimized design of power section and control loop Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs 
Specify input/output power for each node in the tree Check for consistency Design each individual node
Power Supply Design Tool
SMPS design, by topology, by type and by product PFC design with analog and digitial control Supports various PCB configurations Choose type: DC/DC AC/DC 太陽光発電システム TestTypeName AC/DC PFC
LED Lighting Design Tool
Handles AC-DC and DC-DC design in common topologies Displays interactive and annotated schematic Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data Choose type: DC/DC AC/DC
Digital Power Workbench
Provides a step-by-step optimized design of power section and control loop Generates the STM32Cube embedded software package for custom applications and allows firmware project generation, compatible with multiple STM32 IDEs Power Tree Designer
Specify input/output power for each node in the tree Check for consistency Design each individual node Choose design tool: 
Select ratings and application waveforms Get junction temperature and blocking voltage graphs Search and sort suitable devices 
Select ratings and application waveforms Estimate power losses Search and sort suitable devices 
Supports long mission profiles Provides power loss and temperature graphs Helps define heatsink thermal properties 
Help select the right ViPOWER Automotive power device Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis Supports various PCB configurations 
Specify system ratings and surge waveform Search and sort suitable devices 
Build simple schematics and firmware inputs in minutes Quickly generate reliable estimates of: Battery life System power consumption Bill of materials costs
AC Switches Simulator
Select ratings and application waveforms Get junction temperature and blocking voltage graphs Search and sort suitable devices Rectifier Diodes Simulator
Select ratings and application waveforms Estimate power losses Search and sort suitable devices STPOWER Studio
Supports long mission profiles Provides power loss and temperature graphs Helps define heatsink thermal properties Twister Sim
Help select the right ViPOWER Automotive power device Supports load-compatibility, wiring harness optimization, fault condition impact and diagnostic analysis Supports various PCB configurations TVS Simulator
Specify system ratings and surge waveform Search and sort suitable devices Estimate
Build simple schematics and firmware inputs in minutes Quickly generate reliable estimates of: Battery life System power consumption Bill of materials costs Choose design tool: 
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 
Returns circuit component values Provides current error graphs 
Provides current error graphs. Help to select the right High side current sensing and shunt devices.
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 Low side Current Sensing
Returns circuit component values Provides current error graphs High side Current Sensing
Provides current error graphs. Help to select the right High side current sensing and shunt devices. Choose design tool: 
Input geometry and substrate properties Get antenna impedance 
Enter forward and reverse link characteristics The tool returns link budget estimate 
Enter antenna parameter and matching target Select the topology of the matching network The tool returns component values for the desired design targets
NFC Inductance
Input geometry and substrate properties Get antenna impedance UHF Link Budget
Enter forward and reverse link characteristics The tool returns link budget estimate NFC Tuning Circuit
Enter antenna parameter and matching target Select the topology of the matching network The tool returns component values for the desired design targets