Axxxxu_4 Series - LCAS Asymmetrical Multiport SIDACtor® Device

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

This solid state SIDACtor® protection device is an integrated multichip solution for protecting multiple twisted pair from overvoltage conditions. Based on a six-pin surface mount SOIC package, it is equivalent to four discrete DO-214AA or two TO-220 packages. Available in surge current ratings up to 500A, the multiport line protector is ideal for densely populated line cards that cannot afford PCB inefficiencies or the use of series power resistors.

SIDACtor® devices are used to enable equipment to meet various regulatory requirements including GR 1089, ITU K.20, K.21 and K.45, IEC 60950, UL 60950, and TIA/EIA-IS-968 (formerly known as FCC Part 68).

  • All measurements are made at an ambient temperature of 2 °C. Ipp applies to -40 °C through +85 °C temperature range.
  • Ipp is a repetitive surge rating and is guaranteed for the life of the product.
  • Listed SIDACtor® devices are bi-directional. All electrical parameters and surge ratings apply to forward and reverse polarities.
  • Vdrm is measured at Idrm.
  • Vs is measured at 100 V/µs
  • Special voltage (Vs & Vdrm) and holding current (Ih) requirements are available upon request.
  • Off-state capacitance is measured at 1 MHz with a 2 V bias and is a typical value.

Access specifications, certifications, check availability and order parts below

Catalog #VDRM T-R
SizePins T-RCO 2V
IscurrIDRM @
IH (mA)di/dt @
A1220UA4L280350MS-0133-1 6-42058005120500CheckOrder
A1220UC4L280350MS-0133-1 6-435208005120500CheckOrder
A1225UA4L330420MS-0133-1 6-42058005120500CheckOrder
A1225UC4L330420MS-0133-1 6-435208005120500CheckOrder
Obsolete: 2009 -02-01
Replaced By: A1220UA4L
Obsolete: 2009 -02-01
Replaced By: A1220UB4L
280350MS-0133-1 6-435108005120500
Obsolete: 2010 -07-12
Obsolete: 2009 -02-01
Replaced By: A1220UC4L
Obsolete: 2009 -02-01
Replaced By: A1225UA4L
330420MS-0133-1 6-42058005120500
Obsolete: 2009 -02-01
Replaced By: A1225UB4L
330420MS-0133-1 6-435108005120500
Obsolete: 2009 -09-01
330420MS-0133-1 6-435108005120500
Obsolete: 2009 -02-01
Replaced By: A1225UC4L

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