kmp_78253c_d04 page 1 of 5 $ f or full details go to www .cd4power .com/rohs for full details go to www.murata-ps.com/rohs features n rohs compliant n maxim max253 compatible n 3.3v and 5v versions n isolation to 4kv dc n frequency range to 500khz n toroidal construction n industry-standard pinout n ul 94 v-0 package materials n fully encapsulated n low profle n surface mount option n industrial temperature range description the 78253 series of converter transformers are specifcally designed for use with the max253 chip set to provide isolated power supplies. the 5v version can supply 1w and the 3.3v version can supply 500mw. a centre tapped secondary winding allows for full bridge, half bridge or voltage doubling. surface-mount parts the surface-mount (m suffx) products are not recommended for new designs. for existing designs, however, murata power solutions will continue to manufacture and fully support these parts. for recommended alternatives please refer to the 78253j series datasheet. selection guide order code input voltage output voltage max. output current isolation voltage turns ratio package style v v ma v dc 78253/35c 3.3 5.0 100 1500 1:2.27 dil 78253/35mc sm 78253/55c 5.0 5.0 200 1500 1:1.31 dil 78253/55mc sm 78253/35vc 3.3 5.0 100 4000 1:2.14 dil 78253/35mvc sm 78253/55vc 5.0 5.0 200 4000 1:1.33 dil 78253/55mvc sm order code details order code package type packaging type quantity 78253/xxc 6 pin dil tube 50 78253/xxmc 6 pin sm tube 50 78253/xxmc-r 6 pin sm tape & reel 500 78253/35(m)c characteristics parameter conditions min. typ. max. units primary inductance, l p 100khz, 250mv 0.30 0.38 0.46 mh secondary inductance, l s 100khz, 250mv 1.60 2.00 2.40 mh leakage inductance, l l 100khz, 250mv 0.30 1.00 h interwinding capacitance, c ww 100khz, 250mv 30 50 pf primary d.c. resistance, r dc >0.1vdc 0.40 1.00 ? volt-time product, et pins 1/2 or 2/3 30 35 vs 78253/55(m)c characteristics parameter conditions min. typ. max. units primary inductance, l p 100khz, 250mv 0.60 0.83 1.10 mh secondary inductance, l s 100khz, 250mv 1.10 1.40 1.70 mh leakage inductance, l l 100khz, 250mv 0.35 1.00 h interwinding capacitance, c ww 100khz, 250mv 30 50 pf primary d.c. resistance, r dc >0.1vdc 0.70 1.50 ? volt-time product, et pins 1/2 or 2/3 40 50 vs 78253/35(m)vc characteristics parameter conditions min. typ. max. units primary inductance, l p 100khz, 20mv 110 142 185 h secondary inductance, l s 100khz, 20mv 550 710 850 h leakage inductance, l l 100khz, 250mv 3.00 5.00 h interwinding capacitance, c ww 100khz, 250mv 4.20 8.00 pf primary d.c. resistance, r dc >0.1vdc 0.30 0.50 ? volt-time product, et pins 1/2 or 2/3 18 22 vs 78253/55(m)vc characteristics parameter conditions min. typ. max. units primary inductance, l p 100khz, 20mv 190 240 310 h secondary inductance, l s 100khz, 20mv 350 444 540 h leakage inductance, l l 100khz, 250mv 5.20 8.00 h interwinding capacitance, c ww 100khz, 250mv 4.20 8.00 pf primary d.c. resistance, r dc >0.1vdc 0.40 0.60 ? volt-time product, et pins 1/2 or 2/3 25 28 vs all specifcations typical at t a =25 c 78253 series max253 compatible converter transformers www.murata-ps.com www.murata-ps.com/ support
kmp_78253c_d04 page 2 of 5 package specifications mechanical dimensions recommended footprint details 6 pin dil 6 pin sm 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 400ma isolation voltage 78253/xx(m)c (fash tested for 1 second) 1500v dc isolation voltage 78253/xx(m)vc (fash tested for 1 second) 4000v dc 0.1350.02 (3.440.50) 0.25 (6.35) 0.354 (9.0) max 0.375 (9.52) max 0.012(0.30) 0.008(0.20) 0.40 (10.16) 0.1 (2.54) 0.025 (0.63) 0.021 (0.53) 0.354 (9.0) max 0.375 (9.52) max 0.5 (12.70) 0.025 (0.63) 0.021 (0.53) 0.1 (2.54) 0.035 (0.90) 0.012 0.30 (0.008 0.20) 0.25 (6.35) 78253/55mc xyyww 78253/35c xyyww primary secondary primary secondary 1 2 3 6 4 5 1 2 3 6 4 5 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. 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) 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 . top view top view 78253 series max253 compatible converter transformers www.murata-ps.com/ support
kmp_78253c_d04 page 3 of 5 typical characteristics (voltage curves) voltage curves output voltage (v) output voltage (v) output current (ma) output current (ma) output voltage (v) output voltage (v) output current (ma) output current (ma) efficiency curves effciency (%) effciency (%) output current (ma) output current (ma) effciency (%) effciency (%) output current (ma) output current (ma) all curves are derived from testing with the maxim max235 ic using the circuit shown in application note mpan-03 ( download at http://www.murata-ps.com/data/apnotes/mpan-03.pdf). 10 8 6 4 2 0 0 20 40 60 80 100 120 78253/35(m)c 400 78253/55(m)c 10 8 6 4 2 0 0 100 200 300 78253/35(m)vc 10 8 6 4 2 0 0 20 40 60 100 80 78253/55(m)vc 10 8 6 4 2 0 0 100 200 300 400 78253/35(m)c 100 80 60 40 20 0 0 20 40 60 120 80 100 78253/55(m)c 100 80 60 40 20 0 0 200 400 300 100 78253/35(m)vc 0 20 40 60 100 80 100 80 60 40 20 0 78253/55(m)vc 100 80 60 40 20 0 0 200 400 300 100 78253 series max253 compatible converter transformers www.murata-ps.com/ support
kmp_78253c_d04 page 4 of 5 typical characteristics (voltage curves) continued voltage deviation voltage deviation from nominal 25 c output (%) voltage deviation from nominal 25 c output (%) temperature ( c) temperature ( c) voltage deviation from nominal 25 c output (%) voltage deviation from nominal 25 c output (%) temperature ( c) temperature ( c) 78253/35(m)c 110 105 100 95 90 -50 0 50 25 -25 75 100 78253/55(m)c 110 105 100 95 90 -50 0 50 25 -25 75 100 78253/35(m)vc 110 105 100 95 90 -50 0 50 25 -25 75 100 78253/55(m)vc 110 105 100 95 90 -50 0 50 25 -25 75 100 soldering information 1 pin fnish matte tin peak wave solder temperature 300?c for 10 seconds peak refow temperature 220?c 2 tube outline dimensions all specifcations typical at t a =25 c 1 for further information, please visit www.murata-ps.com/rohs 2 for high temperature refow parts see 78253j series. 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) tube length: 18.3 0.08 (465 2 ). tube quantity: 50. tube material: antistatic coated clear pvc. unless otherwise stated all dimensions in inches(mm) 0.01 ( 0.25). technical notes isolation voltage hi pot test, flash tested, withstand volt - age, proof voltage, 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 compo - nent 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 operation? for a part holding no specifc agency approv - als both input and output should normally be maintained within selv limits i.e. less than 42.4v peak, or 60vdc. the isolation test voltage 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 correctly with several hundred volts offset applied continuously across the isolation bar - rier; 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-accessible circuitry ac - cording to safety standard requirements. repeated 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 ma - terials, construction and environment. this series has toroidal isolation transformers, with no additional insulation between pri - mary and secondary windings of enameled wire. while parts can be expected to with - stand several times the stated test voltage, the isolation capability does depend on the wire insulation. any material, including this enamel (typically polyurethane) is suscep - tible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. we therefore strongly advise against repeated high voltage isolation test - ing, but if it is absolutely required, that the voltage be reduced by 20% from specifed test voltage. this consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. 78253 series max253 compatible converter transformers www.murata-ps.com/ support
kmp_78253c_d04 page 5 of 5 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. ? 2011 murata power solutions, inc. 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) ? ? reel quantity: 500 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 78253 35mc xyyww unless otherwise stated all dimensions in inches (mm) 0.01(0.25). 78253 series max253 compatible converter transformers murata power solutions, inc. 11 cabot boulevard, mansfeld, ma 0204 8 -1151 u.s.a. iso 9001 and 14001 registered www.murata-ps.com/ support
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