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 surface mount t1 carrier interface transformers t1/cept telecom line interface applications package style smt mechanicals dimensions are in inches(mm). dimension tolerance is +/- 0.02(0.51) unless otherwise specified. 0.215(5.46) max 0.015(0.38) 0.004(0.10) 0.350(8.89) +/- 0.005(0.13) 0.012(0.31) 0.008(0.20) 4 o nom 0.025(0.64) 0.015(0.38) 0.350(8.89) 0.375(9.53) 0.285(7.24) max bel date code part number 0.018(0.45) +/- 0.002(0.05) top view 0.485(12.32) max 0.05(1.27)typ. schematics primary 18 11 10 9 secondary primary secondary 6 3 a 16 14 primary 12 8 11 10 9 secondary primary b secondary 6 3 16 14 the bel surface mount "topper tm " package offers an industry standard package size and pin-out at an aggressive price. electricals part number turns ratio t1/t2 1:1.7/1:2ct 1:1/1:1.25/1:2ct leakage inductance l l ( m h) max @ 25 o c S553-0013-04 s553-0013-05 0.50/0.80 0.50/0.50/0.80 35 50 dcr (ohms) max 0.80/1.80 0.80/1.10/1.80 a b schematic coupling capacitance (pf) max turns ratio of s553-0013-05 ia (1-2):(16-14)/(1-3):(16-14)/(5-8):(9-11) bel offers a new cost effective package on our standard t1/cept telecom interface line transformers. this sixteen lead, topper tm , surface mount package, provides a superior, cost effective, quality product. * high pot 2000 vrms measured for one minute. * primary inductance (ocl) is 1.20 milihenries minimum. * primary dcr is 0.80 ohms maximum. tm0008 t108 * coupling capacitance (c ww ) is 35 picofarads maximum. * custom designs available.
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