b1-16 STF28-461 emi filter 0.8 amp emi i nput f ilter 28 v olt i nput description the STF28-461 emi filter module has been designed as a companion for interpoint smsa flyback power converters. multiple smsa power converters can be operated from a single filter provided the total power line current does not exceed the filter maximum rating. the stf filter will reduce the smsa s power line reflected ripple current to within the limit of mil-std-461c, method ce03, as shown in the example of figures 4 and 5. the stf filter is fabricated using thick film hybrid technology and is sealed in a metal package for space, military, aerospace and other applications requiring emi suppression. s creening and r eports the STF28-461 filter offers three screening options ?standard, class h, or class k. see section c2, quality assurance, pages c2- 7 through c2-9, for descriptions. detailed reports on product performance are also available and are listed on page c2-9. o peration the smsa power converter has an internal capacitor across its input power terminals. when the smsa and stf filters are used together, this capacitor becomes part of the filter and forms its final lc output section. the stf filter provides both differential and common mode rejection bringing dc/dc converters into compliance with mil-std-461c ce03. it is designed to be used with the smsa, smhf, and mch series of converters. the stf filter can be used with multiple converters up to the rated current of the filter. for more information, contact your interpoint representative listed in section a5. f eatures fully qualified to class h or k passive components for maximum tolerance in space environments ?5 to +125? operation 28 volt input up to 0.8 amps throughput current 50 db minimum attenuation at 500 khz compliant to mil-std-461c, ce03 compatible with mil-std-704e dc power bus size (max.): 0.975 x 0.800 x 0.270 (24.77 x 20.32 x 6.86 mm) see section b8, cases a1, for dimensions. weight: 10.3 grams typical, 11.5 grams maximum screening: standard, class h, or class k (mil-prf-38534) see section c2 for screening options, see section a5 for ordering information. model STF28-461 0.8 amp 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. STF28-461 is a trademark of interpoint. copyright 1999 interpoint. all rights reserved.
b8-6 case a c ases case a bottom view see figures 2 - 4 for pin configurations. dot on top of case indicates pin one. 0.975 max (24.77) 0.800 max (20.32) materials header kovar/nickel/gold (case a3, kovar/nickel) cover kovar/nickel pins kovar/nickel/gold, matched 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 0.097 (2.46) 0.697 (17.70 squared corner and dot on top of case indicate pin one. 0.397 (10.08) 0.000 0.135 (3.43) 0.835 (21.21) 0.270 max (6.98) 0.000 0.735 (18.67) projection weld seam seal fmsa emi filter: screening e standard, es, or 883 stf emi filter: screening e space standard, h, or k 13 84 7 2 65 bottom view case a1 0.270 max (6.86) 0.000 0.27 0.02 (6.9 0.5) 0.27 0.02 (6.9 0.5) 0.018 0.002 dia. (0.46 0.05) 0.000 0.097 (2.46) 0.697 (17.70 0.000 0.135 (3.43) 0.835 (21.21) 0.270 max (6.98) 0.000 14 75 23 6 0.235 (5.97) 0.435 (11.05) 0.535 (13.59) mch series: screening e standard, es, or 883 slh series: screening e space standard, h, or k bottom view case a2 0.270 max (6.86) 0.000 0.27 0.02 (6.9 0.5) 0.27 0.02 (6.9 0.5) projection weld seam seal squared corner and dot on top of case indicate pin one. 0.018 0.002 dia. (0.46 0.05) 0.000 0.097 (2.46) 0.697 (17.70 0.000 0.135 (3.43) 0.835 (21.21) 18 16 9 23 0.235 (5.97) 14 15 dch series: screening e standard or es 0.335 (8.51) bottom view case a3 0.350 max (8.89) 0.350 max (8.89) 0.000 0.27 0.02 (6.9 0.5) 0.018 0.002 dia. (0.46 0.05) projection weld dot on top of case indicates pin one. 0.000 0.27 0.02 (6.9 0.5) seam seal f igure 2: c ase a1 f igure 3: c ase a2 f igure 4: c ase a3 f igure 1: c ase a 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 cause some distortion. please refer to the numerical dimensions for accuracy.
c2-7 qa screening space products s pace p roducts e lement e valuation s tandard c lass c lass t est p erformed (o) h k ( component level ) m/s p m/s p m/s p element electrical yes no yes yes yes yes element visual no no yes yes yes yes internal visual no no yes no yes no temperature cycling no no no no yes yes constant acceleration no no no no yes yes interim electrical no no no no yes no burn-in no no no no yes no post burn-in electrical no no no no yes no steady state life no no no no yes no voltage conditioning /aging no no no no no yes visual inspection no no no no no yes final electrical no no yes yes yes yes wire bond evaluation * no no yes yes yes yes sem no no no no yes no slam /c-sam: input capacitors only no no no yes no yes (add? test, not req. by h or k) definitions element evaluation: component testing/screening per mil-std-883 as determined by mil-prf-38534 sem: scanning electron microscopy slam : scanning laser acoustic microscopy c-sam: c - mode scanning acoustic microscopy notes m/s active components (microcircuit and semiconductor die) p passive components * not applicable to emi filters that have no wirebonds smflhp series smfl series smhp series (o&h only) smtr series ssp series smhf series smsa series slh series slim module sfme120 emi filter sfme28 emi filter sfcs emi filter sfmc emi filter stf emi filter applies to the following products:
c2-8 qa screening space products e nvironmental s creening t est p erformed s tandard c lass c lass ( end item level ) (o) h k non-destruct bond pull* method 2023 no no yes pre-cap inspection method 2017, 2032 yes yes yes temperature cycle method 1010, cond. c yes yes yes constant acceleration method 2001, 3000 g yes yes yes pind test method 2020, cond. b no no yes radiography method 2012 no no yes pre burn-in test yes yes yes burn-in, method 1015, 125? 96 hours yes no no 160 hours no yes no 2 x 160 hour (includes mid bi test) no no yes final electrical test mil-prf-38534, group a yes yes yes hermeticity test fine leak, method 1014, cond. a yes yes yes gross leak, method 1014, cond. c yes yes yes final visual inspection method 2009 yes yes yes test methods are referenced to mil-std-883 as determined by mil-prf-38534. note * not applicable to emi filters that have no wirebonds. smflhp series smfl series smhp series (o&h only) smtr series ssp series smhf series smsa series slh series slim module sfme120 emi filter sfme28 emi filter sfcs emi filter sfmc emi filter stf emi filter applies to the following products:
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