• Fully qualified to Class H or K
• Passive components for
maximum tolerance in space
• –55° to +125°C operation
• 120 volt input
• Up to 2.1 amps of
• Up to 60 dB attenuation
at 500 kHz.
• Compliant to
• Compatible with
DC power bus
EMI FILTER 2.1
3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16mm)
See Section B8, case U1, for dimensions.
110 grams maximum
Standard, Class H, or Class K (MIL-PRF-38534)
See Section C2 for screening options, see Section A5 for
The SFME120-461™ EMI filter modules are specifically designed to
reduce the reflected input ripple current of Interpoint’s high
frequency DC/DC converters. SFME120-461 filters minimize elec-
tromagnetic interference (EMI) for Interpoint’s SMHP120 Series of
converters. These filters are intended for use in 120 volt applica-
tions which must meet MIL-STD-461 levels of conducted emis-
sions. One filter can be used with multiple converters up to the rated
throughput current of the filter.
filter reduces the common mode and differential noise generated by
the converters. SFME120-461 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 SFME120-461 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.
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 conduc-
tors. For the best connection, mount the filter’s and converter’s
baseplates on or above a small ground plane.
SFME120-461 filters are rated for full power operation from –55°C
to +125°C case temperature. Current is derated linearly to zero at
+135°C case temperature.
Switching DC/DC converters naturally generate two noise compo-
nents 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.
Where low noise currents are required to meet CE03 of MIL-STD-
461, a power line filter is needed. The SFME120-461 EMI power line
The maximum dc insertion loss at full load and nominal input voltage
represents a power loss of less than 4%.
SFME120-461 filters are sealed in metal hermetic side-leaded pack-
ages (see Section B8, cases U2, V, W, Y, and Z). Additionally the
FMD28-461 filter is available in a metal hermetic down-leaded
package (see Section B8, case J4).
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. SFME120-461 is a trademark of Interpoint.
Copyright © 1999 Interpoint. All rights reserved.
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