b3-17 description interpoint specifically designed the fmh-461 emi filter to reduce the input line reflected ripple current of the following high frequency dc/dc converters: mhd, mhf, mhf+, mhv, msa 1 , and mtr series converters. it will also reduce emi for several of interpoint s lower frequency converters: mhe/mlp, mhl, mto, and mtw series. the fmh-461 filter is ideal for use in applications which must meet mil-std-461c levels of conducted and radiated emissions. throughput current is 1.5 amps. at 16 vdc input (low line), the filter provides 24 watts of throughput power. mil-std n oise m anagement when used in conjunction with interpoint converters, the fmh-461 emi filter reduces input ripple current by 35 db or greater at 200 khz and by at least 50 db at 500 khz (see figures 5 and 6 and electrical characteristics table). this attenuation gives the converter/filter combination performance which exceeds mil-std-461c s ce03 test. f ilter o peration fmh-461 filters are rated for full power operation from ?5? to +125? baseplate temperature. operation is offered up to the absolute maximum of +135? with derating as defined in ?ecommended operating conditions?on the following page. the maximum dc insertion loss at full load and nominal input voltage (28 vdc) represents a power loss of less than 2%. 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. 1. msa models may require an inductor in series with the msa s positive input. 2 h is the suggested value. emi i nput f ilter 28 v olt i nput fmh emi filter 1.5 amp f eatures ?5? to +125? operation 50 db minimum attenuation at 500 khz compliant to mil-std-461c, ce03 compatible with mil-std-704e dc power bus size (max.): non-flanged, case e3 1.460 x 1.130 x 0.330 (37.08 x 28.70 x 8.38 mm) flanged, case g3 2.005 x 1.130 x 0.330 inches (50.93 x 28.70 x 8.38 mm) see section b8, cases e3 and g3, for dimensions. weight: 22 grams typical, 28 grams maximum screening: standard, es, or 883 (class h). see section c2 for screening options, see section a5 for ordering information. model fmh-461 1.5 amp
absolute maximum ratings recommended operating conditions typical characteristics input voltage 0 to 40 vdc continuous lead soldering temperature (10 sec per lead) 300? storage temperature range (case) ?5? to +150? b3-18 fmh emi filter 1.5 amp input voltage range 16 to 40 vdc continuous case operating temperature (tc) ?5? to +125? full power derating dc input/output current derate linearly from 100% at 125? to 0% at 135? case electrical characteristics: 25? tc, nominal vin, unless otherwise specified. emi i nput f ilters capacitance 0.024 f max, any pin to case isolation 100 megohm minimum at 500 v any pin to case, except case pin fmh-461 parameter conditions min typ max units input voltage continuous 0 28 40 vdc input current 1.5 a noise rejection 200 khz 35 40 db 500 khz 50 60 dc resistance (r dc ) tc = 25? 0.20 0.35 output voltage 1 steady state v out = v in - i in (r dc ) vdc output current ripple 0.3 a rms steady state 1.5 a internal power dissipation maximum current 0.5 0.8 w notes 1. typical applications result in vout within 2% of vin. 2 f 6800 pf 500 v positive input input common positive output output common fmh-461 590 h 30 h 3300 pf 500v 1 f 5.1 1 f 2 f 34 f igure 1: s chematic
pin out model numbering key bottom view fmh non-flanged and flanged dot on top of cover indicates pin one. dotted line outlines flanged package option. 12 54 3 fmh - 461 f / 883 base model mil-std-461 reference screening (standard screening has no designator in this position.) case option (non-flanged case has no designator in this position) b3-19 emi i nput f ilters see section b8, cases e3 and g3 for dimensions. pin designation 1 positive input 2 positive output 3 case ground 4 output common 5 input common f igure 3: p in o ut dscc number dscc d rawing (5915) 95003-01hxc 95003-01hzc fmh -461 f ilter s imilar p art fmh-461/883 fmh-461f/883 for exact specifications for a dscc product, refer to the dscc drawing. see section a3, ?md/dscc lists? for more information. fmh emi filter 1.5 amp +vin +vout input common output common case r l r l emi filter dc/dc converter +vin +vout input common output common case chassis ground multiple units allowed up to rated output current of filter f igure 2: c onnection d iagram the case ground connection between the filter and the converter should be as low an impedance as possible to minimize emi. direct contact of baseplate to chassis ground provides the lowest impedance.
b3-20 typical performance curves: 25? tc , nominal vin, unless otherwise specified. emi i nput f ilters fmh emi filter 1.5 amp frequency (mhz) 0.1 1 10 50 .015 emission level (db a) 90 80 70 60 50 40 30 20 10 0 ce03 limit f igure 4 frequency (mhz) 0.1 1 10 50 .015 emission level (db a) 90 80 70 60 50 40 30 20 10 0 ce03 limit f igure 5 f igure 6 -10 0 10 20 db ohms = 20 log z out frequency (hz) 1 k 10 k 100 k 1 m -20 mhf+2805s converter without filter mhf+2805s converter with fmh-461 filter typical output impedance (z) with input shorted fmh-461 26421-001-dts rev a dq# 4044 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. fmh-461 is a trademark of interpoint. copyright 1992 - 1999 interpoint. all rights reserved.
b8-15 case g c ases materials header cold rolled steel/nickel/gold cover mhf+ series and fmh filter kovar/nickel smhf cold rolled steel/nickel pins #52 alloy (all cases) compression glass seal case dimensions in inches (mm) tolerance 0.005 (0.13) for three decimal places 0.01 (0.2) for two decimal places unless otherwise specified case g bottom view flanged package see figures 25 - 27 for pin configuration 2.005 max (50.93) 1.130 max (28.70) squared corner and dot on top of case indicate pin one. caution heat from reflow or wave soldering may damage the device. solder pins individually with heat application not exceeding 300 c for 10 seconds per pin. flange thickness: 0.047 (1.19) 1.590 (40.39) 0.128 dia (3.25) 0.030 dia. (0.76) flanged cases: designator "f" required in case option position of model number mhf+ series single and dual, lim5050 module: screening standard, es, or 883 smhf series, slim5050 module: screening space standard, h, or k bottom view case g1 0.000 0.205 (5.21) 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07) 0.000 0.160 (4.06) 0.960 (24.38) 1 2345 876 0.140 (3.56) 0.560 (14.22) 0.330 max. (8.38) 0.000 0.25 (6.35) 0.330 max. (8.38) 0.000 0.25 (6.35) squared corner and dot on top of case indicate pin one. projection weld seam seal f igure 25: c ase g1 f igure 24: c ase g m aximum d imensions note: although every effort has been made to render the case drawings at actual size, variations in the printing process may ca use some distortion. please refer to the numerical dimensions for accuracy.
b8-16 case g c ases 1.590 (40.39) 0.128 dia (3.25) 0.030 dia. (0.76) flanged case: designator required in case option position of model number. mhf+ series triple: screening standard, es, or 883 bottom view case g2 0.000 0.205 (5.21) 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07) 0.000 0.160 (4.06) 0.960 (24.38) 1 2345 986 7 0.140 (3.56) 0.560 (14.22) 0.330 max. (8.38) 0.000 0.25 (6.35) 0.330 max. (8.38) 0.000 0.25 (6.35) projection weld seam seal squared corner and dot on top of case indicate pin one. f igure 26: c ase g2 1.590 (40.39) 0.128 dia (3.25) 0.030 dia. (0.76) flanged case: designator required in case option position of model number. fmh emi filter: screening standard, es, or 883 bottom view case g3 0.000 0.205 (5.21) 1.205 (30.61) 0.000 0.160 (4.06) 0.960 (24.38) 1 2 5 4 0.140 (3.56) 0.560 (14.22) 3 0.330 max. (8.38) 0.000 0.25 (6.35) 0.330 max. (8.38) 0.000 0.25 (6.35) projection weld seam seal squared corner and dot on top of case indicate pin one. f igure 27: c ase g3
b8-10 case e c ases case e bottom view see figures 16 ?18 for pin configurations. squared corner and dot on top of case indicate pin one. 1.460 max (37.08) 1.130 max (28.70) materials header cold rolled steel/nickel/gold cover kovar/nickel (smhf series cold rolled steel/nickel/gold) pins #52 alloy/gold compression glass seal 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 300 c for 10 seconds per pin. 0.000 0.205 (5.21) 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07) 0.330 max (8.38) 0.000 0.25 (6.35) 0.000 0.160 (4.06) 0.960 (24.38) 1 2345 0.030 dia. (0.76) 876 mhf+ series single and dual: screening ?standard, es, or 883 mhf series and lim5050 module: screening ?standard or es smhf series single and dual and slim5050 module: screening ?space standard, h, or k hr120 series: no screening options bottom view case e1 0.330 max (8.38) 0.000 0.25 (6.35) projection weld seam seal squared corner and dot on top of case indicate pin one. f igure 16: c ase e1 f igure 15: c ase e m aximum d imensions note: although every effort has been made to render the case drawings at actual size, variations in the printing process may ca use some distortion. please refer to the numerical dimensions for accuracy.
b8-11 case e c ases 0.000 0.205 (5.21) 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07) 0.000 0.160 (4.06) 0.960 (24.38) 0.030 dia. (0.76) mhf+ series triple: screening ?standard, es, or 883 1 2345 876 9 bottom view case e2 0.330 max (8.38) 0.000 0.25 (6.35) 0.330 max (8.38) 0.000 0.25 (6.35) projection weld seam seal squared corner and dot on top of case indicate pin one. 0.000 0.205 (5.21) 1.205 (30.61) 0.000 0.160 (4.06) 0.960 (24.38) 0.030 dia. (0.76) fmh emi filter: screening ?standard, es, or 883 1 2 4 5 0.560 (14.22) 3 bottom view case e3 0.330 max (8.38) 0.000 0.25 (6.35) 0.330 max (8.38) 0.000 0.25 (6.35) projection weld seam seal squared corner and dot on case top indicate pin one. f igure 17: c ase e2 f igure 18: c ase e3
c2-10 test (125? products) standard /es /883 (class h)* pre-cap inspection method 2017, 2032 yes yes yes temperature cycle (10 times) method 1010, cond. c, -65? to 150? no no yes method 1010, cond. b, -55? to 125? no yes no constant acceleration method 2001, 3000 g no no yes method 2001, 500 g no yes no burn-in method 1015, 160 hours at 125? no no yes 96 hours at 125? case (typical) no yes no final electrical test mil-prf-38534, group a subgroups 1 through 6: -55?, +25?, +125? no no yes subgroups 1 and 4: +25? case yes yes no hermeticity testing fine leak, method 1014, cond. a no yes yes gross leak, method 1014, cond. c no yes yes gross leak, dip (1 x 10 -3 ) yes no no final visual inspection method 2009 yes yes yes test methods are referenced to mil-std-883 as determined by mil-prf-38534. *883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature range of ?5? to +125?. mor series mflhp series mfl series mhp series mtr series mqo series** mhd series mhv series mhf+ series mhf series** mga series msa series mgh series mch series fm-704a emi filter fmd**/fme emi filter fmc emi filter fmh emi filter fmga emi filter fmsa emi filter hum modules** lcm modules** lim modules qa screening 125? products 125? p roducts applies to the following products **mflhp series, mqo series, mhf series, fmd emi filters, hum modules, and lcm modules do not offer ?83?screening.
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