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Overvoltage protection device with thermal shutdown
  • active Active

The STBP120 device provides overvoltage protection for input voltage up to +28 V. Its low RDS(on) N-channel MOSFET switch protects the systems connected to the OUT pin against failures of the DC power supplies in accordance with the China MII Communications Standard YD/T 1591-2006.

In the event of an input overvoltage condition, the device immediately disconnects the DC power supply by turning off an internal low RDS(on) N-channel MOSFET to prevent damage to protected systems.

In addition, the device also monitors its own junction temperature and switches off the internal MOSFET if the junction temperature exceeds the specified limit.

The device can be controlled by the microcontroller and can also provide status information about fault conditions.

The STBP120 is offered in a small, RoHS-compliant TDFN – 10-lead (2.5 mm x 2 mm) package.

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Errata Sheet
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Key Features

  • Input overvoltage protection up to 28 V
  • Integrated high voltage N-channel MOSFET switch
  • Low RDS(on) of 90 mΩ
  • Integrated charge pump
  • Thermal shutdown protection
  • Softstart feature to control the inrush current
  • Enable input (EN)
  • Fault indication output (FLT)
  • IN input ESD withstand voltage up to ±15 kV (air discharge), up to ±8 kV (contact discharge) in typical application circuit with 1 μF input capacitor (±2 kV HBM for standalone device)
  • Certain overvoltage options compliant with the China Communications Standard YD/T 1591- 2006 (overvoltage protection only)
  • Small, RoHS compliant 2.5 x 2 mm TDFN – 10-lead package.

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS6152: Overvoltage protection device with thermal shutdown
5.1 706 KB

Application Notes

Description Version Size
AN3050: STBP120 overvoltage protection device
1.1 903 KB

Technical Notes & Articles

Description Version Size
TN0941: Reset and supervisor ICs: frequently asked questions (FAQ)
1.0 329 KB

Publications and Collaterals


Description Version Size
ST’s solutions for mobile devices
2,855 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STBP120AVDK6FActiveTDFN10 2.5x2x0.75Tape And Reel_-.49Distributor reported inventory date: 2016-02-10
Distributor NameRegionStockMin. order
STBP120BVDK6FActiveTDFN10 2.5x2x0.75Tape And Reel_-.49Distributor reported inventory date: 2016-02-09
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA25003000
STBP120CVDK6FActiveTDFN10 2.5x2x0.75Tape And Reel_-.49No availability reported, please contact our Sales officeEcopack2PDF
STBP120DVDK6FActiveTDFN10 2.5x2x0.75Tape And Reel_-.49No availability reported, please contact our Sales officeEcopack2PDF

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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