Hi to all, We are trying to protect an Ethernet port built around an integrated transformer/connector and an Intel 82559 PHY for the GR1089 Intrabuilding metallic surge of 800V/100A 2/10us. In short, we are looking for SOT23 or SOT323 dual diodes (series configuration with a pinout compatible with a BAV99) with the lowest possible forward voltage drop for a surge current in the range of 10 to 35Amps. Would you have parts to suggest?
More precisely, the integrated transformer survives the surge very well but transfers approximately 10 to 35Amps to it secondary winding for a duration of about 2us which destroys the PHY. We successfully protected the transmit lines with Infineon BAT64-04W dual diodes clamping the lines to the ground and 3.3V power rail. For the receive lines we marginally passed with 3 of these parts in parallel in the same configuration but this is difficult to install on our current PCB which only has one footprint per line. Adding 22 ohms series resistors on the PHY input pins solves the problem but requires a PMB and revision on our PCB. Our hope is to find a diode with a low enough clamping voltage to protect the inputs without series resistors. For this, the diode forward voltage drop would have to be less than 4V in that current range (the BAT64-04W has 4.3V). Best Regards, Eric =================================== Éric Meunier Designer EMC/Environmental E-mail: [email protected] 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: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
