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AC switch failure mode detector
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The STCC08 is an AC switch failure mode detector and an AC power switch driver. It drives the AC switch and informs the MCU of switch failure. The MCU takes the appropriate actions to put the system in a secure state.

Diode-mode, short circuit detection and open switch in both AC line polarities are detected.

The STCC08 helps home appliances to meet the IEC 60335-1 safety standard.

The STCC08 can be easily interfaced to an MCU with its CMOS input AC switch driver and CMOS compatible output for the failure mode detector.

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Errata Sheet
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Key Features

  • 3.3 V and 5 V power supply compatible
  • ACS, ACST, TRIAC compatible
  • Gate driver output: 28 mA max sink current
  • Adjustable gate drive current
  • Sense the AC switch voltage in both AC line polarities
  • Diode mode failure detection for solid state AC switches
  • Short circuit failure detection for AC switches, relays, electromechanical switches
  • Open AC switch detection for AC switches, relays, electromechanical switches
  • SO-8 SMD package
  • BenefitsEnable appliances to meet IEC 60335-1 and IEC 60730-1 standardsEnable appliances to meet IEC 61000-4-4 standardEliminates high DC current in inductive load, by detecting the diode mode failureImprove system safety monitoring open switch failure with critical loads such as door locksEnable MCU to sense all AC switch failure modes and protect the applianceLess MCU pin allocated to AC failure detection multiple STCC08 designed with resistor dividers uses one I/OEasy to drive with MCU directly connected or through an opto couplerHighly compact with integrated solution in SMD version

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS5786: AC switch failure mode detector
1.1 253 KB

Application Notes

Description Version Size
AN1608: CLT3-4BT6 demoboard: check the robustness of CLT3-4BT6
1.4 107 KB
AN2703: Parameter list for SCRs, TRIACs, AC switches, and DIACS
2.5 99 KB
AN2716: STCC08 application guidelines
2.1 1,301 KB
AN2859: Multiplexed diagnostics of AC switches using two STCC08
2.0 562 KB
AN533: SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting
3.4 217 KB

Technical Notes & Articles

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

User Manual

Description Version Size
UM0575: STEVAL- IHT003V1, e-STARTER demonstration board based on the ACST6 and X02
1.1 721 KB

Publications and Collaterals


Description Version Size
AC switch failure-mode supervisor
1.0 225 KB

Selection Guides

Description Version Size
Thyristors, Triacs, AC switches and A.S.D™ selection guide
1.0 1,717 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeJunction Temperature (max) Order From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STCC08NRNDSO-8Tube125-.83No availability reported, please contact our Sales officeEcopack1-
STCC08RLActiveSO-8Tape And Reel125-.57Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order

(*) 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.