defining a degree of excellence bel fuse inc. 198 van vorst street, jersey city, nj 07302 ? tel: 201-432-0463 ? fax: 201-432-9542 ? e-mail: belfuse@belfuse.com website: http://www.belfuse.com specifications subject to change without notice. S553-3873-17 -0.8 150 -20 -40 4 a s556-5999-30 -0.5 180 -20 -40 4 b mechanical schematics ? designed for use with national semiconductor's ric2a and leric 8 (dp83959) multi-port phy transceivers ? robust miniature smt packaging, rated to 225oc peak ir reflow temperature ? low cost dual 2-port design solution ? 2000 vrms isolation ? s556-5999-30 includes inductors for use with additional differential filtering 10base-t network components ab electricals at 25oc insertion loss ocl return loss crosstalk rise (db) max (inductance) (db) min (db) min time part no. 1mhz-30mhz h min 5mhz-10mhz 100khz-30mhz nsec max schematic 960012b
defining a degree of excellence corporate office bel fuse inc. 198 van vorst street, jersey city, nj 07302-4496 tel: 201-432-0463 fax: 201-432-9542 e-mail: belfuse@belfuse.com internet: http://www.belfuse.com far east office bel fuse ltd. 8f/8 luk hop street san po kong kowloon, hong kong tel: 852-2328-5515 fax: 852-2352-3706 european office bel fuse europe ltd. preston technology management centre marsh lane, preston pr1 8ud lancashire, u.k. tel: 44-1772-556601 fax: 44-1772-888366 960012b application notes application circuit 10base-t network components ? bel has designed these parts for use with national semiconductor's 10base-t transceivers, which include digital filtering in the silicon. all bel part types contain high voltage isolation transformers. the bel s556-5999-30 also contains inductor cores, when used with the recommended externally placed discrete elements, create a differential filter design sometimes necessary to reduce the effect of unwanted noise and to fully comply with ieee 802.3 standards. contact the local bel sales office for a separate application note for implementation characteristics for the s556-5999-30. common mode chokes are not inclusive to the design of these parts. with good layout and proper grounding techniques, the use of common mode chokes may be eliminated. for information on recommended pcb layouts, please contact bel engineering. if necessary, separately packaged common mode chokes are available on data sheet 960046a. ? bel's low profile, surface mount packaging is ideal for high speed pick and place machinery. parts can be shipped on tape and reel for high speed placement. construction processes have been implemented for thermal compatibility with high temperature ir reflow assembly processing. post dipping of leads assist with pc board solderability. each part is optically inspected to meet rigid coplanarity requirements. s556-5999-30 S553-3873-17
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