AK20-Y Series - 20KA TVS in reflow Axial package

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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. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The AK20-Y series of high power TVS diode is specially designed for meeting severe surge test environment of both AC and DC line protection applications. It features a very fast response and ultra low clamping characteristics as compared to MOVs (Metal Oxide Varistors). It accomplishes this by virtue of the Littelfuse Foldbak™ technology, which provides a clamping voltage lower than the avalanche voltage (but above the rated working voltage); therefore, any voltage rise due to increased current conduction is maintained at a minimum magnitude, providing the best possible protection level. These AK components can be connected in series and / or parallel to create a very high surge current protection solution.


  • No wear-out nor degrade surge rating over multiple transient events as long as within surge capability
  • Ultra high power rating
  • Very low clamping voltage
  • Reflow soldering capability
  • Ultra compact: less than one-tenth the size of traditional discrete solutions
  • Sharp breakdown voltage
  • Low slope resistance
  • Bi-directional
  • Foldbak™ technology for superior clamping factor
  • Symmetric lead width for easy soldering during assembly
  • IIEC 61000-4-2 ESD 15 kV (air), 8 kV (contact) rating
  • Lightning, 20 kA (8/20 as defined in IEC 61000-4-5 2nd edition)
  • EFT protection of data lines in accordance with IEC 61000-4-4
  • UL Recognized compound meeting flammability rating V-0
  • Halogen-free and RoHS compliant
  • Glass passivated junction
  • Pb-free E4 means 2nd level interconnect is Pb-free and the terminal finish material is silver (IPC/ JEDEC J-STD-609A.01)

Access specifications, certifications, check availability and order parts below

Catalog #VR (Vso)MIN VBR@IT
Vc (V)IT
IPP 8x20μs
Operating Temperature Maximum CelsiusPolarityPackagePartner ECAD ModelsStockSamplesCompare
AK20-016C-Y1617.519.33010520000125BipolarAxial LeadAK20-016C-YCheckOrder
AK20-058C-Y58647012010520000125BipolarAxial LeadAK20-058C-YCheckOrder
AK20-063C-Y63687512510520000125BipolarAxial LeadAK20-063C-YCheckOrder
AK20-066C-Y66728013010520000125BipolarAxial LeadAK20-066C-YCheckOrder
AK20-076C-Y76859516010520000125BipolarAxial LeadAK20-076C-YCheckOrder
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
AK20-058C-Y SPCL TVS AXIAL KA RATED -20KA 58V BI RoHS No 11/30/2020 PbFree No 11/30/2020 CoC_RoHS9_AK20-058C-Y REACH209_Declaration_Contain-_AK20-058C-Y Yes
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