• Fully qualified to Class H or K
• Passive components for
maximum tolerance in space
• –55° to +125°C 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
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.
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.
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.
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.
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.
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