kmp_78250c_c02 page 1 of 3 technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 www.murata-ps.com 78250 series max250 compatible converter transformers for full details go to www.murata-ps.com/rohs $ features n rohs compliant n maxim max250 compatible n isolation to 4kvrms n industry-standard pinout n surface mount option n ul 94 v-0 package materials n low profle n toroidal construction n fully encapsulated n industrial temperature range description the 78250 series of converter transformers are specifcally designed for use with maxim chipsets to provide isolated rs232 interfaces. carefully controlled turns ratios ensure consistent performance whilst a toroidal construction minimises emi. characteristics 78250c/78250mc 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 h interwinding capacitance, c ww 100khz, 100mv 69 90 pf primary d.c. resistance, r dc <0.1vdc 1.0 2.0 ? volt-time product, et pins1/2 or 2/3 50 vs characteristics 78250vc/78250mvc 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 h interwinding capacitance, c ww 100khz, 100mv 9 12 pf primary d.c. resistance, r dc <0.1vdc 1.4 1.8 ? volt-time product, et pins1/2 or 2/3 50 vs order code details order code package type packaging type quantity 78250c / 78250vc 6 pin dil tube 50 78250mc / 78250mvc 6 pin sm tube 50 78250mc-r / 78250mvc-r 6 pin sm tape & reel 500 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)c (fash tested for 1 second) 1.5kvrms isolation voltage 78250v(m)c (fash tested for 1 second) 4.0kvrms all specifcations typical at t a =25 c technical notes isolation voltage hi pot test, flash tested, withstand voltage, proof volt - age, dielectric withstand voltage & isolation test voltage are all terms that relate to the same thing, a test voltage, applied for a specifed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. all products in this series are 100% production tested at their stated isolation voltage. a question commonly asked is, what is the continuous voltage that can be applied across the part in normal opera - tion? for a part holding no specifc agency approvals both input and output should normally be maintained within selv limits i.e. less than 42.4v peak, or 60vdc. the isolation test volt - age represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. the part could be expected to function cor - rectly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-acces - sible circuitry according to safety standard requirements. r epeated high- voltage isolation testing it is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environ - ment. this series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled wire. while parts can be expected to withstand several times the stated test voltage, the isolation capability does de - pend on the wire insulation. any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. we there - fore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specifed test voltage. this consideration equally applies to agency recog - nized parts rated for better than functional isolation where the wire enamel insulation is always supple - mented by a further insulation system of physical spacing or barriers.
kmp_78250c_c02 page 2 of 3 technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 www.murata-ps.com 78250 series max250 compatible converter transformers package specifications mechanical dimensions recommended footprint details 0.354 (9.0) max. 0.375 (9.52) max. 0.5 (12.70) 0.025 (0.63) 0.021 (0.53) 0.035 (0.90) 0.0120.30 (0.0080.20) 0.25 (6.35) 0.1 (2.54) 78250mc xyyww 0.1350.02 (3.440.50) 0.25 (6.35) 0.354 (9.0) max. 0.375 (9.52) max primary primary secondary secondary 0.012(0.30) 0.008(0.20) 0.40 (10.16) 0.025 (0.63) 0.021 (0.53) 0.1 (2.54) 78250c xyyww 6 pin dil 6 pin sm soldering information 1 pin fnish pure tin dip peak wave solder temperature 300?c for 10 seconds peak refow temperature 220?c 1 for further information, please visit www.murata-ps.com/rohs 1 2 3 6 4 6 5* 4 1 2 3 0.10 (2.54) 0.10 (2.54) ?0.05 (1.20) +0.006 (0.15) -0.000 (0.00) 0.45 (11.50) 0.10 (2.54) 0.04 (1.00) 0.06 (1.60) 6 pin dil 6 pin sm unless otherwise stated all dimensions in inches (mm) 0.01 ( 0.25). all pins on a 0.1 (2.54) pitch and within 0.01 ( 0.25) of true position . unless otherwise stated all dimensions in inches (mm) 0.01 ( 0.25). all pins on a 0.1 (2.54) pitch and within 0.01 ( 0.25) of true position . * pin 5 is connected to secondary center tap. package weight 1.0g typ. 0.10 (2.54) 0.10 (2.54) ?0.05 (1.20) +0.006 (0.15) -0.000 (0.00) 0.45 (11.50) 0.10 (2.54) 0.04 (1.00) 0.06 (1.60) tube outline dimensions 0.023 0.005 (0.60 0.15) 0.16 (4.00) 0.22 (5.50) 0.43 (10.95) 0.51 (12.95) 0.15 (3.80) 0.62 (15.70) unless otherwise stated all dimensions in inches (mm) 0.01 ( 0.25). tube length: 18.3 0.08 (465 2 ). tube material: antistatic coated clear pvc.
kmp_78250c_c02 page 3 of 3 technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 www.murata-ps.com 78250 series max250 compatible converter transformers murata power solutions, inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. the descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. specifcations are subject to change without notice. ? 2008 murata power solutions, inc. usa: mansfeld (ma), tel: (800) 233 2765, email: sales@ murata-ps .com canada: toronto, tel: (866) 740 1232, email: toronto@ murata-ps .com uk : milton keynes, tel: +44 (0)1908 615232, email: mk@ murata-ps .com france: montigny le bretonneux, tel: +33 (0)1 34 60 01 01, email: france@ murata-ps .com germany: mnchen, tel: +49 (0)89-544334-0, email: ped.munich@ murata-ps .com japan: tokyo, tel: 3-3779-1031, email: sales_tokyo@ murata-ps .com osaka, tel: 6-6354-2025, e mail: sales_osaka@murata-ps.com website: www.murata-ps.jp china: shanghai, tel: +86 215 027 3678, email: shanghai@murata-ps.com guangzhou, tel: +86 208 221 8066, email: guangzhou@murata-ps.com murata power solutions, inc. 11 cabot boulevard, mansfeld, ma 0204 8 -1151 u.s.a. tel: (508) 339-3000 (800) 233-2765 fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com iso 9001 registered tape & reel specifications reel outline dimensions tape outline dimensions 1.20 (30.4) max. 0.94-1.08 (23.9-27.4) 0.53 (13.50) 0.50 (12.80) 0.059 (1.50) min. 2.36 (60) min. 0.80 (20.20) min. 3.9 (100) min. leader section 15.7 (400) min. goods enclosure section trailer section 6.3 (160) min. ?15.039 (382) max. ? ? * 0.96 (24.4) 1.04 (26.4) ? ? unless otherwise stated all dimensions in inches (mm) 0.01(0.25). * includes fange distortion at outer edge. ? measured at hub. 0.024 (0.60) max. 0.283 (7.20) 0.369 (9.37) direction of unreeling 0.069 (1.75) 0.453 (11.50) 0.157 (4.00) 0.079 (2.00) 0.472 (12.00) cover tape 0.059 (1.50 ) +0.004 -0.000 +0.10 -0.00 0.945 (24.00 ) +0.012 -0.004 +0.30 -0.10 78250c xyyww unless otherwise stated all dimensions in inches (mm) 0.01(0.25).
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