CG4 Series - Two-terminal SMT High Voltage Gas Plasma Arresters

GDT CG4 Hi Res
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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.

CG4 Series high voltage miniature SMT gas discharge tubes provide high levels of protection against fast rising transients caused by lightning disturbances. These GDTs are high voltage (800V - 3000V) devices designed for over-voltage protection for high isolation applications.


  • High DC breakdown voltage 800V to 3000 V
  • Surface mount form factor with two squared terminals
  • Medium surge capability 3kA (8/20µs)
  • Miniature footprint
  • Lead-free and RoHS compliant
  • UL Recognized


  • Air conditioning
  • Variable frequency drives (VFDs) / inverters
  • High voltage power supply
  • Medical electronics such as X-ray machines and NMR equipment
  • Set-top boxes
  • High voltage test  equipment

Access specifications, certifications, check availability and order parts below

Catalog #VMIN Spark
VNom Spark
VMAX Spark
@ 100V/μs
Capacitance (Co) (pF)Impulse Discharge Current @8/20μs (kA)ElectrodesFailsafePartner ECAD ModelsStockSamplesCompare
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
CG40.8SM GP ST&ARD S.A. 800V 6.2*4.2mm SMT RoHS No 05/10/2016 PbFree No 05/10/2016 CoC_RoHS10_CG40.8SM REACH205_Declaration_CG40.8SM Yes
Does not Contain IPC_CG40.8SM
CG41.0SM GP ST&ARD S.A. 1000V 6.2*4.2mm SMT RoHS No 04/15/2006 PbFree No 04/15/2006 CoC_RoHS10_CG41.0SM No
CG41.2SM GP ST&ARD S.A. 1200V 6.2*4.2mm SMT RoHS No 04/15/2006 PbFree No 04/15/2006 CoC_RoHS10_CG41.2SM REACH_SVHC Declaration_CG41.2SM.pdf No
Does not Contain
CG41.8SM GP ST&ARD S.A. 1800V 6.2*4.2mm SMT RoHS No 05/10/2016 PbFree No 05/10/2016 CoC_RoHS10_CG41.8SM REACH_SVHC Declaration_CG41.8SM Yes
Does not Contain
CG42.0SM GP ST&ARD S.A. 2000V 6.2*4.2mm SMT RoHS No 05/10/2016 PbFree No 05/10/2016 Yes
CG42.5SM GP ST&ARD S.A. 2500V 6.2*4.2mm SMT RoHS No 04/15/2006 PbFree No 04/15/2006 CoC_RoHS10_CG42.5SM REACH201_Declaration_CG42.5SM No
Does not Contain
CG42.7SM GP ST&ARD S.A. 2700V 6.2*4.2mm SMT RoHS No 05/10/2016 PbFree No 05/10/2016 CoC_RoHS10_CG42.7SM REACH201_Declaration_CG42.7SM Yes
Does not Contain
CG43.0SM GP ST&ARD S.A. 3000V 6.2*4.2mm SMT RoHS No 04/15/2006 PbFree No 04/15/2006 REACH219_Declaration_CG43.0SM Yes
Does not Contain IPC_CG43.0SM
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