|Category||Power Management => DC-DC Converters|
|Datasheet||Download SFME datasheet
Fully qualified to Class or K Passive components for maximum tolerance in space environments to +125°C operation to 10 amps of throughput current 50 dB attenuation at 500 kHz. Compliant MIL-STD-461C, CE03 Compatible with MIL-STD-704E DC power bus
Size (max.): x 0.400 inches 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 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 at 500 kHz and 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.
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.
All SFME28-461 Series filters are rated for full power operation from to +125°C case temperature. Current is derated linearly to zero at +135°C case temperature.
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.
The maximum dc insertion loss at full load and nominal input voltage represents a power loss of less than 4%.
SFME28-461filters are sealed in metal hermetic side-leaded packages. 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. is a trademark of Interpoint. Copyright © 1999 Interpoint. All rights reserved.CASE U TOP VIEW (PIN SIDE) See Figures 55 and 56 for dimensions
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 300°C for 10 seconds per pin.
TOP VIEW CASE U1 MFL Series and MHP Series: Screening Standard, 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 K HUM70 Module and LCM Module: Screening Standard or ES
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