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SFME28-461 EMI FILTER 10 AMP
FEATURES
* Fully qualified to Class H or K * Passive components for maximum tolerance in space environments * -55 to +125C operation * Up to 10 amps of throughput current * Up to 50 dB attenuation at 500 kHz. * Compliant to MIL-STD-461C, CE03 * Compatible with MIL-STD-704E DC power bus
EMI INPUT FILTER 28 VOLT INPUT
INPUT VOLTAGE AND CURRENT Input (V) 28 Current ( A) 10
Size (max.): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16mm) See Section B8, case U1, for dimensions. Weight: 110 grams maximum Screening: Standard, Class H, or Class K (MIL-PRF-38534) See Section C2 for screening options, see Section A5 for ordering information.
DESCRIPTION
The SFME28-461TM Series EMI filter modules are specifically designed to reduce the reflected input ripple current of high frequency DC/DC converters. SFME28-461 filters minimize electromagnetic interference (EMI) for Interpoint's space applications converters. These filters are intended for use in 28 volt applications which must meet MIL-STD-461 levels of conducted emissions. One filter can be used with multiple converters up to the rated throughput current of the filter. Where low noise currents are required to meet CE03 of MIL-STD461, a power line filter is needed. The SFME28-461 Series of EMI power line filters reduces the common mode and differential noise generated by the converters. SFME28-461 filters reduce input ripple current by as much as 60 dB at 500 kHz and 55 dB at 1 MHz when used in conjunction with Interpoint's DC/DC converters. The filter must be placed as close as possible to the converter for optimum performance. The baseplates of the filter and the converter should be connected with the shortest and widest possible conductors. For the best connection, mount the filter's and converter's baseplates on or above a small ground plane.
SCREENING AND REPORTS
The SFME28-461 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 OVER TEMPERATURE
All SFME28-461 Series filters are rated for full power operation from -55C to +125C case temperature. Current is derated linearly to zero at +135C case temperature.
INPUT RIPPLE AND EMI
Switching DC/DC converters naturally generate two noise components on the power input line: differential noise and common mode noise. Input ripple current refers to both of these components. Differential noise occurs between the positive input and input common. Most Interpoint converters have an input filter that reduces differential noise which is sufficient for most applications. Common mode noise occurs across stray capacitances between the converter's power train components and the baseplate (bottom of the package) of the converter.
INSERTION LOSS
The maximum dc insertion loss at full load and nominal input voltage represents a power loss of less than 4%.
PACKAGING
SFME28-461filters are sealed in metal hermetic side-leaded packages. For more information, contact your Interpoint representative listed in Section A5.
B1-13
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. SFME28+461 is a trademark of Interpoint. Copyright (c) 1999 Interpoint. All rights reserved.
CASE U
CASES
Angled corner indicates pin one
1.505 max (38.23)
CASE U TOP VIEW (PIN SIDE) See Figures 55 and 56 for dimensions
3.005 (76.33) max. Note: Pins are shown for Case U1.
Materials Header Cold Rolled Steel/Nickel/Gold Cover Kovar/Nickel Pins #52 alloy/Gold 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 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.
FIGURE 54: CASE U MAXIMUM DIMENSIONS
B8-36
CASES
TOP VIEW CASE U1 MFL Series and MHP Series: Screening - Standard, ES or 883 MFLHP Series, FMD270 EMI Filter, and FMD28-461SL EMI Filters: Screening - Standard or ES SMFL, SMFLHP, SMHP, and SSP Series; SFCS, and SFME EMI Filters: Screening - Standard, Class H or K HUM70 Module and LCM Module: Screening - Standard or ES
Angled corner indicates pin one. 1.505 (38.23) max. 1.380 (35.05) 1.250 (31.75) 1.050 (26.67) 0.850 (21.59) 0.650 (16.51) 0.450 (11.43) 0.250 (6.35) 0.120 (3.05) 0.000
0.400 (10.16) max.
CASE U
Seam Seal
0.23 (5.8) Lead Length 0.128 dia (3.25). 0.040 dia (1.02) 1 2 3 4 5 6 12 11 10 9 8 7
0.120 (3.05) 0.250 (6.35)
2.750 (69.85)
2.880 (73.15) 3.005 (76.33) max.
0.220 (5.59
FIGURE 55: CASE U1
0.050 (1.27) 0.000
0.000
B8-37
QA SCREENING SPACE PRODUCTS
SPACE PRODUCTS
ELEMENT EVALUATION TEST PERFORMED (COMPONENT LEVEL) Element Electrical Element Visual Internal Visual Temperature Cycling Constant Acceleration Interim Electrical Burn-in Post Burn-in Electrical Steady State Life Voltage Conditioning /Aging Visual Inspection Final Electrical Wire Bond Evaluation* SEM SLAMTM/C-SAM: Input capacitors only (Add'l test, not req. by H or K) Notes M/S P * STANDARD CLASS (O) H M/S P M/S P yes no no no no no no no no no no no no no no no no no no no no no no no no no no no no no yes yes yes no no no no no no no no yes yes no no CLASS K M/S P yes yes no yes yes no no no no yes yes yes yes no yes yes yes yes yes no no no no no no no no no yes yes yes yes yes yes yes no no
yes yes yes yes no yes yes no
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 SLAMTM: 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, 125C 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) no yes yes yes no no yes yes no no yes CLASS H no yes yes yes no no yes no yes no yes CLASS K yes yes yes yes yes yes yes no no 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 SMHF Series SMSA Series SLH Series SLIM Module SFME120 EMI Filter SFME28 EMI Filter SFCS EMI Filter SFMC EMI Filter STF EMI Filter
C2-8

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