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Automation sensor transient and overvoltage protection
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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 Figure 8 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.

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Errata Sheet
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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 switch 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 orIEC 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
  • Benefits
  • Compliant for interface with logic input type 1, 2 and 3 IEC 61131-2 standard
  • Recommended to protect any 3-wire sensor compliant with EN 60947-5-2 standard
  • Highly compact with integrated power solution in SMD version

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS5985: Automation sensor transient and overvoltage protection
3.0 489 KB

Application Notes

Description Version Size
AN2863: Smart inductive proximity switch with SPT01-335DEE
1.1 200 KB
AN4209: Design methodology for repetitive voltage suppressors (RVS) in repetitive mode: STRVS
2.0 648 KB

Technical Notes & Articles

Description Version Size
TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches
3.1 333 KB

HW Model & CAD Libraries

HW Model & CAD Libraries

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 1,318 KB


Description Version Size
Products and solutions for solar energy
1.0 1,318 KB

Sample & Buy

Part Number Marketing StatusStand-off voltage (nom) DirectionalityPackagePacking TypeOrder From STUnit Price (US$)*
@ 50
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
SPT01-335DEEActive36Uni-DirectionalQFN-6L+3EPTape And Reel-.818Distributor reported inventory date: 2015-12-01
Distributor NameRegionStockMin. order
Farnell Element14Order NowEUROPE25911

(*) 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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