SK040R - Sxx40x Series

Series: Sxx40x Series      Obsolete: 2016-03-31      Replaced By: SK040RTP Questions? Contact Littelfuse Support
40 Amp Standard SCRs
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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.

40 Amp bi-directional solid state switch series is designed for AC switching and phase control applications such as motor speed and temperature modulation controls, lighting controls, and static switching relays.

Alternistor type devices only operate in quadrants I, II, & III and are used in circuits requiring high dv/dt capability.

Features & Benefits
  • RoHS compliant
  • Glass - passivated junctions
  • Voltage capability up to 1000V
  • Surge capability up to 400A
  • Electrically isolated K & J -Packages are UL recognized for 2500Vrms


  • Applications
    Excellent for AC switching and phase control applications such as heating, lighting, and motor speed controls.

    Typical applications are AC solid-state switches, industrial power tools, exercise equipment, white goods and commercial appliances.

    Alternistor Triacs (no snubber required) are used in applications with extremely inductive loads requiring highest commutation performance.

    Internally constructed isolated packages are offered for ease of heat sinking with highest isolation voltage.

    RoHS HF_Compliance_TO 220 263_2010 08 12 pdf

    ChinaRoHS_Thyristor_TO 220R pdf

    ChinaRoHS_Thyristor_TO 263_N_Package_ Non isolated pdf

    Wuxi ISO TS16949 Certification

    pdf icon Switching Thyristors Sxx40x Datasheet

    Excellent unidirectional switches for phase control applications such as heating and motor speed controls...

    pdf icon Product Selection Guide

    Electronics Circuit Protection Product Selection Guide - A guide to selecting Littelfuse circuit protection components for electronic applications...

    pdf icon Circuit Protection Technology Application Matrix

    Littelfuse is the world leader in the design and manufacturing of fuses for the automotive, industrial, handheld, computer and telecom markets...

    pdf icon Switching Thyristor Product Catalog