date: april 15-2000 pre by:wuqingli rev.: x.0 40 pin smd ethernet 10/100 base quad port transformer pn/:40ST1041C data sheet a.general specifications 1.ieee 802.3 ethernet compatiable, 100 base-tx 2.surface mountable 3.design for multiport repeater and ethernet switching hub application 4.customer designs available for specific application b.electrical specifications@25c 1.isolation hi-pot: 1500 vrms (pri. /sec.) 2.turn ratio ( 5%): tx=1ct: 1ct, rx=1:1 3.rise time: 2.5 ns typ 4.cw/w: 28 pf max 5.leakage inductance (1mhz): 0.45uh max 6.cmrr (0.1-100 mhz): -37db min 7.return loss (min): 5-30 mhz 30-60mhz 60-80 mhz -16db -12db -10 db 8.crosstalks (0.1 to 100mhz): -38db min 9.ocl (uh,min):350 uh, at 8ma dc from 0-70c 10.dcr: 0.9 max 11. insertion loss (1mhz-100mhz): -1.15db max c.schematic & dimensions & marking (unit mm): rx tx rx tx rx tx rx tx
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