description the fm-461, fma-461, and fmb-461 emi filter modules have been specifically designed to reduce the input line reflected ripple current of interpoints mto, mtw, mhe, mlp, and mfw series of dc/dc converters. they are intended for use in applications of high frequency (100 khz) switch-mode dc/dc converters which must meet mil-std- 461c levels of conducted power line noise. these filters are built using thick-film hybrid technology and are sealed in metal packages for military, aerospace, and other high-reliability applications. see section b8, cases h3, h5, k4, and k6 for dimen - sions. see section c2 for screening options. mil-std n oise m anagement when used in conjunction with interpoints dc/dc converters (see connection diagram, figure 2), the input ripple current will be reduced by 40 db within the frequency band of 100 khz to 50 mhz. this gives the filter/converter combination a performance which exceeds the ce03 test limit of mil-std-461c. the ce03 performance of a model mhe2805s converter with and without the fm-461 filter is shown in figures 6 and 7. f ilter o peration a fast-reacting (1 picosecond) transient suppressor clamps the input voltage at approximately 47 v, protecting the dc/dc converter from line induced transients. the filters are rated to operate, with no degradation of performance, over the temperature range of C55c to +85c (as measured at the baseplate). above 85c, input voltage and current must be derated as specified in derating on the following page. the maximum power dissipation of the filters at maximum input current represents a power loss of less than 3% at typical input voltage. l ayout r equirements the case of the filter must be connected to the case of the converter through a low impedance connection to minimize emi. features ? C55c to +85c operation ? 0 to 40 vdc volt input ? up to 40 db attenuation 110 khz to 50 mhz ? transient suppression ? compliant to mil-std-461c, ce03 size (max.): non-flanged case h3 or h5 2.125 x 1.125 x 0.495* inches (53.98 x 28.58 x 12.57* mm) flanged case k4 or k6 2.910 x 1.125 x 0.495* inches (73.91 x 28.58 x 12.57* mm) see cases h3, h5, k4, and k6, for dimensions. *height varies depending on model. weight: maximum C fm-461 38 grams, fma-461 42 grams, fmb-461 43 grams screening: standard or es. see 85c non-qml productsCenvironmental screening (standard & es) screening table for more information. models i nput v oltage and c urrent i nput (v) 0 - 40 0 - 40 0 - 40 c urrent ( a) 1.75 3.8 5.0 1 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters 28 v olt i nput not recommended for new designs
derating absolute maximum ratings i nput voltage ? 0 to 40 vdc continuous lead soldering t emperature (10 sec per lead) ? 300c storage temperature r ange (case) ? C55c to +135c isolation ? 100 megohm minimum at 500 v ? any pin to case (except case pin) recommended operating conditions i nput voltage range ? 0 to 40 vdc continuous case operating t emperature (tc) ? C55c to +85c full power ? C55c to +125c absolute i nput voltage derate linearly from 100% at 85c case to the 33 vdc at 125c case input ripple current derate linearly from 100% at 85c case to the following at 125c case 270 ma rms fm-461 400 ma rms fma-461 480 ma rms fmb-461 dc i nput and output current derate linearly from 100% at 85c case to the following at 125c case 750 ma fm-461 1.7 a fma-461 1.7 a fmb-461 x2 0.1 f 0.01 f 0.001 f 4.7 f 150 47 pf 1000 pf 50 1000 pf 500 v positive input input common positive output output common fm-461 469 h 2.4 h f igure 1: s chematic electrical characteristics: 25c tc, nominal vin, unless otherwise specified. note 1. typical applications result in vout within 2% of vin. fm-461 fma-461 fmb-461 units parameter conditions min t yp m a x min t yp m a x min t yp max input voltage continuous 0 28 40 0 28 40 0 28 40 vdc input clamping voltage -55c 38.9 43.2 47.5 42.3 47.0 51.7 44.9 49.9 54.8 38.9 43.2 47.5 42.3 47.0 51.7 44.9 49.9 54.8 38.9 43.2 47.5 42.3 47.0 51.7 44.9 49.9 54.8 vdc +25c +125c input current dc 1.75 0.67 3.8 1.0 5.0 1.2 a a rms ripple noise rejection 15 khz to 50 mhz 40 40 40 db dc resistance ( r dc ) steady state 0.38 0.42 0.07 0.10 0.15 0.07 0.09 0.10 capacitance any pin to case 1900 2200 3700 4400 6450 8000 pf output voltage 1 steady state v out = v in - i in (r dc ) vdc output current steady state 1.75 3.8 5.0 a power dissipation max current 1.3 1.6 2.5 w 2 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters
+vin +vout input common output common case r l r l emi filter dc/dc converter +vin +vout input commo n output common case chassis ground multiple units allowed up to rated output current of filter the case ground connection should be as low an impedance as possible to min mize emi. direct contact of baseplate to chassis ground provides the lowest impedance. f igure 4: c onnection d iagram x3 x2 0.1 f 0.01 f 0.001 f x2 x2 4.7 f 150 47 pf 1000 pf 50 1000 pf 500 v positive input input common positive output output common fma-461 2.4 h >150 h f igure 2: s chematic 4.7 f 3300 pf 500 v positive input input common positive output output common fmb-461 3.5 h 9.4 f 0.65 3.5 h 50 47 pf 500v p6ke47 18.8 f f igure 3: s chematic 3 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters
typical performance curves: 25c tc , nominal vin, unless otherwise specified. 90 70 50 30 .015 .1 1 1 0 5 0 10 emission level (dma) frequency (mhz) ce03 limit f igure 6 mhe converter without filter 90 70 50 30 .015 .1 1 1 0 5 0 10 emission level (dma) frequency (mhz) ce03 limit f igure 7 mhe converter with fm-461 emi filter model numbering key fmb - 461 f / es base model mil-std-461 reference screening fm, fma, or fmb (standard screening has no designator in this position) case option (non-flanged case has no designator in this position) pin out 1 2 3 4 5 squared corner and dot on top of package indicate pin one. bott om view fm-461, fma-461, fmb-461 dotted line outlines flan g ed packa g e option. see cases h3, h5, k4, and k6, for dimensions. f igure 5: p in o ut p in designation 1 positive input 2 positive output 3 case ground 4 output common 5 input common 4 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters
f igure 8: c ase h 3 - fm-461 n on -f langed 0.160 (4.06) 0.960 (24.38) solder seal solder t ip-of f 0.000 0.040 di a (1.02) 0.000 0.000 0.25 +0.05/-0.00 (6.4 +1.3/-0.0) 0.560 (14.22) 0.255 (6.48) 1.855 (47.12) 2.1 10 max (53.59) 1.120 max (28.45) 1 2 4 5 bott om view case h3 0.495 max (12.57) squared corner and dot on top of case indicate pin one. 3 case dimensions in inches (mm) to lerance 0.005 (0.13) for three decimal places 0.01 (0.3) for two decimal places unless otherwise specified caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300c for 10 seconds per pin. materials header cold rolled steel/nickel/t in cover cold rolled steel/nickel/t in pins #52 alloy , compression glass seal case h3, rev b - 20060801 please refer to the numerical dimensions for accuracy . all information is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. copyright ? 1999-2006 interpoint corp. all rights reserved. 5 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters
0.160 (4.06) 0.960 (24.38) solder seal solder tip-off 0.000 0.040 dia (1.02) 0.000 0.000 0.25 +0.05/-0.00 (6.4 +1.3/-0.0) 0.560 (14.22) 0.255 (6.48) 1.855 (47.12) 2.110 max (53.59) 1.120 max (28.45) 1 2 4 5 bottom view case h5 0.495 max (12.57) squared corner and dot on top of case indicate pin one. 3 case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.3) for two decimal places unless otherwise specified caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300c for 10 seconds per pin. materials header cold rolled steel/nickel/tin cover cold rolled steel/nickel/tin pins #52 alloy, compression glass seal case h5, rev b - 20060801 please refer to the numerical dimensions for accuracy. all information is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. copyright ? 1999-2006 interpoint corp. all rights reserved. f igure 9: c ase h 5 - fma /fmb-461 n on -f langed 6 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters
0.155 (3.94) 0.955 (24.26) 0.000 0.040 dia (1.02) 0.000 0.000 0.25 p 0.03 (6.4 p 0.8) 0.555 (14.1) 0.245 (6.22) 1.845 (46.86) 1.115 max (28.32) 1 2 4 5 *flanged case: designator ?f? required in case option position of model number. bottom view case k4 0.162 dia (4.11) 0.230 (5.84) 2.320 (58.93) solder seal solder tip-off 0.417 max (10.59) squared corner and dot on top of case indicate pin one. 3 2.910 max (73.91) case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.3) for two decimal places unless otherwise specified caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300c for 10 seconds per pin. materials header cold rolled steel/nickel/tin cover cold rolled steel/nickel/tin pins #52 alloy, compression glass seal case k4, rev c - 20060801 please refer to the numerical dimensions for accuracy. all information is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. copyright ? 1999-2006 interpoint corp. all rights reserved. flange thickness: 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) f igure 10: c ase k4 - fm-461 f langed 7 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters
0.155 (3.94) 0.955 (24.26) 0.000 0.040 di a (1.02) 0.000 0.000 0.25 0.03 (6.4 0.8) 0.555 (14.1) 0.245 (6.22) 1.845 (46.86) 1.1 15 max (28.32) 1 2 4 5 *flanged case: designator ?f? required in case option position of model number . bott om view case k6 0.162 di a (4. 11 ) 0.230 (5.84) 2.320 (58.93) solder seal solder t ip-of f 0.417 max (10.59) squared corner and dot on top of case indicate pin one. 3 2.910 max (73.91) case dimensions in inches (mm) to lerance 0.005 (0.13) for three decimal places 0.01 (0.3) for two decimal places unless otherwise specified caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300c for 10 seconds per pin. materials header cold rolled steel/nickel/t in cover cold rolled steel/nickel/t in pins #52 alloy , compression glass seal case k6, rev c - 20060801 please refer to the numerical dimensions for accuracy . all information is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. copyright ? 1999-2006 interpoint corp. all rights reserved. flange thickness: 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) f igure 11: c ase k6 - fm a /fmb-461 f langed 8 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters
test 85c 85c standard /es non qml 1 non qml 1 pre-cap inspection method 2017 yes yes temperature cycle (10 times) method 1010, cond. b, -55c to 125c ambient no yes constant acceleration method 2001, 500 g no yes burn-in 96 hours, typical case temperature 85c case 2 no yes final electrical test mil-prf-38534, group a subgroups 1 and 4: +25c case yes yes hermeticity test fine leak, method 1014, cond. a no yes gross leak, method 1014, cond. c no yes gross leak, dip (1 x 10 -3 ) yes no final visual inspection method 2009 yes yes test methods are referenced to mil-std-883 as determined by mil-prf-38534. 85c n on -qml p roducts e nvironmental s creening ( s tandard & e s) notes: 1. non-qml products do not meet all of the requirements of mil-prf-38534 2. burn-in is still air with an ambient temperature designed to bring the case temperature to 85c 26221-001-dts rev a dq# 14006 all technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. interpoint reserves the right to make changes in products or specifications without notice. fm-461 series is a trademark of interpoint. copyright ? 1991 - 2006 interpoint. all rights reserved. 9 fm-461, fma-461 a nd fmb-461 1.75 to 5 amp emi i nput f ilters
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