Automation sensor transient and overvoltage protection

The SPT01-335 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 offering two connections for PNP or NPN sensors as shown in and Figure 9.

Thanks to high performance ST technology, the SPT01-335 protects the proximity sensor to the highest level compliant with IEC 61000-4-2, IEC 61000-4-4 and IEC 60947-5-2 / IEC 61000-4-5 standards.

Key Features

  • Triple diode array for power bus protection, switch protection and reverse blocking protection
  • Flexible connection for NPN low side or PNP high side sensor configuration
  • 6 V to 36 V supply voltage range
  • Stand-off voltage: 36 V
  • Minimum breakdown voltage VBR : 38 V
  • 8/20 μs 2A maximum clamping voltage: 46 V
  • Direct sensor switches current: 300 mA
  • Blocking diode drop forward voltage VF : 1 V at 300 mA
  • Blocking diode maximum 10 ms square pulse current IFSM : 1 A
  • Ambient temperature: -40 °C to +100 °C
  • QFN3x3-6L 1 mm flat package: 3x3 mm
  • Voltage surge: EN 60947-5-2 or IEC 61000-4-5 with RCC = 500 Ω: ±1 kV
  • Electrostatic discharge ESD, IEC 61000-4-2: ± 8 kV in contact, ± 15 kV in air
  • Electrical transient immunity, IEC 61000-4-4: ±2 kV


Technical Documentation

Product Specifications
Description Version Size
DS5985 DS5985: Automation sensor transient and overvoltage protection 4.0 772 KB
Application Notes
Description Version Size
AN4209 AN4209: Design methodology for repetitive voltage suppressors (RVS) in repetitive mode: STRVS 2.1 647 KB
AN2863 AN2863: Smart inductive proximity switch with SPT01-335DEE 1.1 199 KB
Technical Notes & Articles
Description Version Size
TN1173 TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches 5.0 1 MB

HW Model, CAD Libraries & SVD

HW Model, CAD Libraries & SVD
Description Version Size
SPT01-335DEE PSpice model (.lib) and symbols (.olb) 1.0 3 KB

Publications and Collaterals

Description Version Size
Repetitive voltage suppressors for overvoltage protection 1.0 1 MB
ST Protection Finder - The new app for Android and iOS 1.0 1 MB
Description Version Size
Brochure Power management guide 09.2017 3 MB
Products and solutions for solar energy 1.0 1 MB

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Sample & Buy

Part Number Marketing Status Stand-off voltage (V) (nom) Directionality Package Packing Type Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
SPT01-335DEE Active 36 Uni-Directional QFN-6L+3EP Tape And Reel 0.818 50 NEC EAR99 MALAYSIA 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**
SPT01-335DEE ActiveQFN-6L+3EPIndustrialEcopack2 0 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.