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| silicon protection arrays ?2009 littelfuse, inc 11 application guide 1000/gigabit ethernet considerations: 1000 relates to the data rate in mbps (i.e. 1000mbps) for 1000base-t data is transmitted over 4 utp (unshielded twisted pairs) using a 125mhz clock for this data rate the parasitic capacitance should certainly be taken into account the 8 data lines below ( tx0:3 and rx0:3 ) are being protected against lightning transients by a two stage protection scheme the sp03 series (x4) should be used in place of the splv2.8-4 if higher levels of protection are required the sp4060 series can be used in place of the sp3050 devices if the voltage does not exceed 2.5v application schematic: recommended spa devices: ordering number esd level (contact) lightning (t p =8/20 s) i/o capacitance # of channels v rwm packaging splv2.8-4btg 30kv 24a 4pf 4 2.8v soic-8 sp3050-04htg 20kv 10a 2.4pf 4 6v sot23-6 SP4060-08ATG 30kv 20a 4.4pf 8 2.5v msop-8 ethernet phy outside world case gnd splv2.8 ( x2 ) *package is shown as transparent case gnd sp3050 ( x2 ) rj-45 co nn ector j1 j8 nc nc
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