date: april 15-2000 pre by:wuqingli rev.: x.0 20 pin dip ethernet 10/100 base dual port transformer pn/:20PT1021A1 data sheet a.general specifications: 1.ieee 802.3 ethernet compatiable, 100 base-tx 2.20 pin dip package compatible with popular ic chips. 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: tx /rx 0.5uh max 6.cmrr (0.1-100 mhz): -40db 7.crosstalks (0.1 to 100mhz): -38db min 8.primary dc resistance, dcr (ohm max): tx & rx :0.9 9.primary ocl (uh min): tx & rx: 350 at 100khz/0.1vrms, 8ma dc. 10.insertion loss (db max): -1.15db at 1mhz-100mhz 11.return loss (db min): 1mhz-30mhz -18db 30mhz-60mhz -14db 60mhz-80mhz -12db c.schematic & dimensions & marking (unit mm):
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