EMI INPUT FILTER 28 VOLT INPUT STF28-461 EMI FILTER 0.8 AMP FEATURES • Fully qualified to Class H or K • Passive components for maximum tolerance in space environments • –55° to +125°C operation • 28 volt input • Up to 0.8 amps throughput current • 50 dB minimum attenuation at 500 kHz Size (max.): • Compliant to MIL-STD-461C, CE03 Weight: • Compatible with MIL-STD-704E Screening: DC power bus MODEL STF28-461 0.8 amp 0.975 x 0.800 x 0.270 (24.77 x 20.32 x 6.86 mm) See Section B8, cases A1, for dimensions. 10.3 grams typical, 11.5 grams maximum Standard, Class H, or Class K (MIL-PRF-38534) See Section C2 for screening options, see Section A5 for ordering information. 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. SCREENING AND REPORTS The STF28-461 filter offers three screening options – Standard, Class H, or Class K. See Section C2, Quality Assurance, pages C27 through C2-9, for descriptions. Detailed reports on product performance are also available and are listed on page C2-9. OPERATION 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. 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. B1-16 CASES BOTTOM VIEW CASE A1 FMSA EMI Filter: Screening – Standard, ES, or 883 STF EMI Filter: Screening – Space Standard, H, or K Projection Weld Seam Seal Squared corner and dot on top of case indicate pin one. 0.697 (17.70 1 2 3 0.397 (10.08) 8 4 0.097 (2.46) 0.000 7 6 5 0.000 0.27 ±0.02 (6.9 ±0.5) 0.270 max (6.98) 0.27 ±0.02 (6.9 ±0.5) 0.000 0.018 ± 0.002 dia. (0.46 ± 0.05) BOTTOM VIEW CASE A2 MCH Series: Screening – Standard, ES, or 883 SLH Series: Screening – Space Standard, H, or K Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one. 0.697 (17.70 FIGURE 1: CASE A MAXIMUM DIMENSIONS 1 2 3 4 0.018 ± 0.002 dia. (0.46 ± 0.05) 7 0.000 0.27 ±0.02 (6.9 ±0.5) 0.000 0.27 ±0.02 (6.9 ±0.5) 0.270 max (6.98) 0.000 0.270 max (6.86) 0.097 (2.46) 0.000 6 5 0.835 (21.21) 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. FIGURE 2: CASE A1 0.435 (11.05) 0.535 (13.59) 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 0.000 Materials Header Kovar/Nickel/Gold (Case A3, Kovar/Nickel) Cover Kovar/Nickel Pins Kovar/Nickel/Gold, matched glass seal 0.270 max (6.86) 0.975 max (24.77) 0.135 (3.43) CASE A BOTTOM VIEW 0.800 max See Figures 2 - 4 (20.32) for pin configurations. 0.735 (18.67) 0.835 (21.21) Dot on top of case indicates pin one. 0.135 (3.43) 0.235 (5.97) CASE A FIGURE 3: CASE A2 BOTTOM VIEW CASE A3 DCH Series: Screening – Standard or ES Projection Weld 0.697 (17.70 1 2 3 8 16 15 14 9 0.835 (21.21) Dot on top of case indicates pin one. 0.135 (3.43) 0.235 (5.97) 0.335 (8.51) Seam Seal 0.018 ± 0.002 dia. (0.46 ± 0.05) B8-6 0.000 0.27 ±0.02 (6.9 ±0.5) 0.000 0.350 max (8.89) 0.000 0.27 ±0.02 (6.9 ±0.5) 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. 0.350 max (8.89) 0.097 (2.46) 0.000 FIGURE 4: CASE A3 QA SCREENING SPACE PRODUCTS SPACE PRODUCTS ELEMENT EVALUATION TEST PERFORMED (COMPONENT LEVEL) STANDARD CLASS (O) H M/S P M/S P CLASS K 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 SLAM™/C-SAM: Input capacitors only (Add’l test, not req. by H or K) no no no no yes no no no no yes no yes Notes M/S P * Active components (Microcircuit and Semiconductor Die) Passive components Not applicable to EMI filters that have no wirebonds 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 Applies to the following products: 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 C2-7 QA SCREENING SPACE PRODUCTS ENVIRONMENTAL SCREENING TEST PERFORMED (END ITEM LEVEL) Non-destruct bond pull* Method 2023 Pre-cap inspection Method 2017, 2032 Temperature cycle Method 1010, Cond. C Constant acceleration Method 2001, 3000 g PIND Test Method 2020, Cond. B Radiography Method 2012 Pre burn-in test Burn-in, Method 1015, 125°C 96 hours 160 hours 2 x 160 hour (includes mid BI test) Final electrical test MIL-PRF-38534, Group A Hermeticity test Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Final visual inspection Method 2009 STANDARD (O) CLASS H CLASS K no no yes yes yes yes yes yes yes yes yes yes no no yes no yes no yes yes yes yes no no no yes no no no yes yes yes yes yes yes yes yes yes yes 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. Applies to the following products: SMFLHP Series SMFL Series SMHP Series (O&H only) SMTR Series SSP Series C2-8 SMHF Series SMSA Series SLH Series SLIM Module SFME120 EMI Filter SFME28 EMI Filter SFCS EMI Filter SFMC EMI Filter STF EMI Filter