features n maxim compatible n isolation to 4kv n surface mount options n t oroidal construction n standard pinout n ul 94v-0 package material n fully encapsulated n low profile n 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 ensur e consistent performance whilst a toroidal construction minimises emi. the surface mount devices are fully compatible with cecc00802 to 280? which allows them to be placed and reflowed with ic? thus r educing time and cost in production. selection guide 78250/78250m parameter conditions min typ max units primary inductance, l p 10khz, 100mv 1.0 2.0 2.5 mh leakage inductance, l l 100khz, 100mv 2.0 3.0 ? interwinding capacitance, c ww 100khz, 100mv 69 90 pf d.c. resistance, r dc <0.1vdc 1.0 2.0 w v olt-time product, e t 5khz, 5v 50 v? selection guide 78250v/78250mv parameter conditions min typ max units primary inductance, l p 10khz, 100mv 1.0 2.0 2.5 mh leakage inductance, l l 100khz, 100mv 35 40 ? interwinding capacitance, c ww 100khz, 100mv 9 12 pf d.c. resistance, r dc <0.1vdc 1.4 1.8 w v olt-time product, e t 5khz, 5v 50 v? operating free air temperature range ?0? to 85? storage temperature range ?0? to 125? lead temperature 1.5mm from case for 10 seconds 300? peak cur r ent i pk 300ma isolation voltage 78250(m) (flash tested for 1 second) 1500v r ms isolation voltage 78250v(m) (flash tested for 1 second) 4000v r ms absolute maximum ratings all specifications typical at t a = 2 5 ?c . 78250 series converter transformers www.dc-dc.com
78250 series converter transformers c&d technologies (ncl) ltd t anners drive, blakelands north milton keynes mk14 5bu, england t el: +44 (0)1908 615232 fax:+44 (0)1908 617545 email: info@cdtechno-ncl.com www: http://www.dc-dc.com c&d technologies (ncl), inc. 8917 glenwood avenue, raleigh nc 27612, usa t el: +1 (919) 571-9405 fax: +1 (919) 571-9262 email: info@us.cdtechno-ncl.com c&d technologies (ncl) 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 cur r ent and complete specification for your product before use. ?c&d technologies (ncl) limited 2000 nmp 78250.2 no part of this publication may be copied, transmitted or stored in a r etrieval system or reproduced in any way including, but not limited to, photography, photocopy, magnetic or other recording means, without prior written permission from c&d technologies (ncl) limited. instructions for use are available from www.dc-dc.com mechanical dimensions * pin 5 is connected to secondary centre tap. all dimensions in mm xx.xx ?.25mm. all pins on a 2.54mm pitch and within ?.25mm of true position. 6 pin dip 6 pin sm 78250 xyyww 9.52 max 8.89 max 1 2 3 primar y secondar y 6 4 6.35 3.44?.50 0.30 0.20 0.63 0.53 10.16 2.54 78250m xyyww 9.52 max t op view t op view 8.89 max 6.35 0.90 12.70 0.30 0.20 0.63 0.53 2.54 1 2 3 primar y secondar y 6 5* 4
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