Hi Amund, A properly sized varistor ( sometimes with capacitor in parallel) is quite effective. You will find IEC 1000-4-4 mentioned in some varistor datasheets. Just mind that you have the energy rating correctly specified and for really high speed response, opt for surface mount.
The varistors have a parameter called the clamping voltage and you need to be careful that all your protected front end is rated to at least that voltage. Varistor sources include ( I think) EPCOS, Keko-Varicon, Murata, Littelfuse, TDK components, Panasonic etc. You can opt for tranzorbs from the likes of General Semi (Vishay), ST Microelectronics etc for tighter clamping voltages but these are semiconductor types and tend to 'break' when subjected to high energy transients like the surge (EN 610004-5) or automotive load dumps (ISO 7637-1, 2 Test pulse 5). Regards - Chris -----Original Message----- From: [email protected] [SMTP:[email protected]] Sent: Wednesday, December 12, 2001 8:51 PM To: [email protected] Subject: Components to suppress fast transient / bursts Hi all, I do not have any experience with components which could suppress a 2kV (5ns/50ns) electrical fast transient (Burst). Anybody in the group who could come up with some suggestions ? Best regards Amund Westin,Oslo/Norway ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. _____________________________________________________________________ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. _____________________________________________________________________ This message has been checked for all known viruses by Star Internet delivered through the MessageLabs Virus Scanning Service. For further information visit http://www.star.net.uk/stats.asp or alternatively call Star Internet for details on the Virus Scanning Service. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
