Automation sensor transient and overvoltage protection

The SPT02 is specifically designed for the protection of 24 V proximity sensors. It implements the reverse polarity and the overvoltage protection of the sensor power supply and the power switch overvoltage protection.

It provides a very compact and flexible solution.

Thanks to high performance ST technology, the SPT02 protects the proximity sensor to the highest level compliant with IEC 61000-4-2, IEC 61000-4-4 and IEC 61000-4-5 standards.

Key Features

  • Double diode array for switch protection and reverse blocking protection
  • 6 V to 36 V supply voltage range
  • Minimum breakdown voltage VBR : 38 V
  • 8/20 μs 2 A maximum clamping voltage: 46 V
  • Blocking diode drop forward voltage VF : 1.1 V at 300 mA
  • Blocking diode maximum 10 ms square pulse current IFSM : 3 A
  • Ambient temperature: -40 °C to +100 °C
  • μQFN 2L 0.8 mm flat package
  • Complies with following standards
    • Voltage surge: IEC 61000-4-5, RCC = 500 Ω, ±1 kV
    • Electrostatic discharge, IEC 61000-4-2:±8 kV contact discharge±15 kV air discharge
    • Electrical transient immunity: IEC 61000-4-4: ±2 kV
  • Benefits
    • Compliant for interface with logic input type 1, 2 and 3 IEC 61131-2 standard
    • Highly compact with integrated power solution in SMD version


Technical Documentation

Product Specifications
Description Version Size
DS9518 DS9518: Automation sensor transient and overvoltage protection 2.0 448 KB
Application Notes
Description Version Size
AN4275 AN4275: IEC 61000-4-5 standard overview 1.0 383 KB
Technical Notes & Articles
Description Version Size
TN1173 TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches 3.1 333 KB

Publications and Collaterals

Description Version Size
Power over Ethernet protection 2.1 392 KB
Description Version Size
Brochure Power management guide 05.2016 4 MB

Tools and Software

Design Tools
Smart selectors

Sample & Buy

Part Number Stand-off voltage (V) (nom) Directionality Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
SPT02-236DDB 36 Uni-Directional uQFN-2L Tape And Reel Active 0.54 50 NEC EAR99 CHINA MORE INFO DISTRIBUTOR AVAILABILITY

(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SPT02-236DDB ActiveuQFN-2LIndustrialEcopack2 0

(**) 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.