features maxim compatible isolation to 4kv surface mount options toroidal construction standard pinout ul 94v-0 package material fully encapsulated low profile industrial temperature range description the 78250 series of converter transformers are specifically designed for use with maxim chipsets to provide isolated rs232 interfaces. carefully controlled turns ratios ensure consistent performance whilst a toroidal construction minimises emi. the surface mount devices are fully compatible with cecc00802 to 280c which allows them to be placed and reflowed with ic?s thus reducing time and cost in production. newport components 78250 1 78250 converter transformer 6 pin dip (top view) 6 pin sm (top view)* *pin 5 is connected to secondary centre tap. pin connections 5 4 6 2 3 1 secondary primary 4 6 2 3 1 secondary primary preliminary notice : this is not a final specification. some parametric limits may be subject to change.
absolute maximum ratings operating free air temperature range ?40c to 85c storage temperature range ?50c to 125c lead temperature 1.5mm from case for 10 seconds 300c peak current i pk 300ma isolation voltage 78250(m) (flash tested for 1 second) 1500vrms isolation voltage 78250v(m) (flash tested for 1 second) 4000vrms electrical specifications over operating free air temperature range 1 78250 parameter conditions min nom max package style units primary inductance, l p 10khz, 100mv 1.0 2.0 2.5 1 mh leakage inductance, l l 100khz, 100mv 2.0 3.0 h interwinding capacitance, c ww 100khz, 100mv 69 90 pf d.c. resistance, r dc <0.1vdc 1.0 2.0 ? volt-time product, e t 5khz, 5v 50 v s electrical specifications over operating free air temperature range 1 78250M parameter conditions min nom max package style units primary inductance, l p 10khz, 100mv 1.0 2.0 2.5 2 mh leakage inductance, l l 100khz, 100mv 2.0 3.0 h interwinding capacitance, c ww 100khz, 100mv 69 90 pf d.c. resistance, r dc <0.1vdc 1.0 2.0 ? volt-time product, e t 5khz, 5v 50 v s 2 newport components 78250 converter transformer 1 all data taken at t a =25c.
electrical specifications over operating free air temperature range 1 78250v parameter conditions min nom max package style units primary inductance, l p 10khz, 100mv 1.0 2.0 2.5 1 mh leakage inductance, l l 100khz, 100mv 35 40 h interwinding capacitance, c ww 100khz, 100mv 9 12 pf d.c. resistance, r dc <0.1vdc 1.4 1.8 ? volt-time product, e t 5khz, 5v 50 v s electrical specifications over operating free air temperature range 1 78250Mv parameter conditions min nom max package style units primary inductance, l p 10khz, 100mv 1.0 2.0 2.5 2 mh leakage inductance, l l 100khz, 100mv 35 40 h interwinding capacitance, c ww 100khz, 100mv 9 12 pf d.c. resistance, r dc <0.1vdc 1.4 1.8 ? volt-time product, e t 5khz, 5v 50 v s newport components 78250 3 78250 converter transformer 1 all data taken at t a =25c.
typical characteristics isolated rs-232 interface opto? s-4x 4n26 (78250(m)), 4 x cny17-3 (78250v(m)) 4 newport components 78250 converter transformer in4148 +10 v out + ?10 v out max251 max250 9 pin d-type connector 11 5 6 4 x4 opto?s 1 f 1 2 3 6 4 78250 d1 14 13 + 3 ac 3 1 2 4 5 6 6 7 4.7 f 10 v cc d2 en shutdown t2in t2l 8 1 5 +5v td 2 gnd r2din 12 rd t1in t1l 4 rts r1out r1din 9 t1 r2 cts t2 r1 r2out byp iso gnd 14 2 +v -v 13 1 f + 1 f r2 1 t1din t1out 12 t1 t2din t2out 11 t2 r1l r1in cts r1 r2l r2in 9 10 td dcd rd rts dsr 5 9 4 8 3 7 2 1 sg 6 isolation barrier
3.440.50 6.35 8.89 max 9.52 max 0.30 0.20 10.16 2.54 0.63 0.53 78250 xyyww ?1.20 +0.15 -0.00 2.54 2.54 outline dimensions 1 6 pin dip package style recommended footprint details newport components 78250 5 78250 converter transformer 1 1 all dimensions in mm xx.xx 0.25mm. all pins on a 2.54mm pitch and within 0.25mm of true position.
8.89 max 9.52 max 78250M xyyww 12.70 0.63 0.53 2.54 0.90 0.30 0.20 6.35 11.50 2.54 1.00 1.60 outline dimensions 1 6 pin sm package style recommended footprint details 6 newport components 78250 converter transformer 2 1 all dimensions in mm xx.xx 0.25mm. all pins on a 2.54mm pitch and within 0.25mm of true position.
the following newport components publications are also available : the power components handbook (also in cd rom format) emc design guidelines please contact newport components or your local supplier for a copy of these data books. newport components limited reserve the right to alter or improve the specification, internal design or manufacturing process at any time, without notice. please check with your supplier or visit our web site to ensure that you have the current and complete specification for your product before use. for information and instructions on use, please consult the current power handbook. ? newport components limited 2000 no part of this publication may be copied, transmitted or stored in a retrieval system or reproduced in any way including, but not limited to, photography, photocopy, magnetic or other recording means, without prior written permission from newport components limited. information newport components limited newport components inc. 1 tanners drive, blakelands north 8917 glenwood avenue, raleigh milton keynes mk14 5bu, england nc 27612, usa tel: +44 (0)1908 615232 tel: +1 (919) 571-9405 fax: +44 (0)1908 617545 fax: +1 (919) 571-9262 email: info@newport-comps.com email: info@us.newport-comps.com www: http://www.newport-comps.com members of newport technology group 9000sa078250 issue 3 03/00 dcr 2527 fm 13273 / rs 31306
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