Crane Aerospace & Electronics Power Solutions
sFMc28-461 eMi input Filters
28 Volt input – 2.7 aMp
Features
Attenuation 60 dB at 500 kHz, typical
•
Operating temperature -55° to +125°C
•
Qualified to MIL-PRF-38534 Class H and K
•
Passive components used for maximum tolerance
in space environments
•
Nominal 28 V input, 0 V to 50 V operation
•
Up to 2.7 A throughput current
•
Compliant to MIL-STD-461C CE-03
•
Compatible with MIL-STD-704 B-E 28 VDC power bus
i
nput
V
oltage
and
c
urrent
Input (V)
28
Current (A)
2.7
Description
The SFMC28-461™ EMI filters provide an off-the-shelf filtering
solution compliant to MIL-PRF-38534, Class H or Class K,
for use in your space system. SFMC28-461 filters reduce
the input line reflected ripple current of our switching DC/DC
converters. Use an SFMC28-461 filter with our SMTR, SMHF
and SMSA series of DC/DC converters to meet MIL-STD-461C
levels of conducted emission (CE01, CE03). The SFMC filters
are designed exclusively with passive components providing
maximum tolerance for space environments.
F
ilter
d
eSign
SFMC28-461 filters incorporate thick-film hybrid technology and
use only high quality ceramic capacitors for reliable high temper-
ature operation.
All SFMC28-461 filters are built to the same assembly drawing
regardless of environmental screening or radiation tolerance
level. Filters designated level OO, indicating standard environ-
mental screening, are electrically comparable to filters designated
level KH, the highest environmental screening level. This ensures
consistency between your prototype or test system using level
OO filters and your flight system using filters with higher levels of
environmental screening and radiation tolerance. Element evalu-
ation (screening at the component level) of Class H or Class K
filters ensures even greater reliability. Refer to Table 1, 2 and 3
for more information.
S
creening
The SFMC28-461 EMI filters offer environmental screening
levels to Space Prototype (O), Class H, or Class K requirements.
Radiation tolerant to Radiation Hardness Assurance (RHA) levels
of “-” (O) or “H”, per MIL-PRF-38534. Interpoint model numbers
use an “O” in the RHA designator position to indicate the “-”
(dash) Radiation Hardness Assurance level of MIL-PRF-38534,
which is defined as “no RHA”. See Screening Tables 1, 2 and 3
for more information.
o
perating
t
emperature
r
ipple
r
eduction
The SFMC28-461 EMI filter, when used with Interpoint’s
converters, reduces reflected input ripple current by a minimum
of 55 dB at 500 kHz and 60 dB at 1 MHz. The filter and converter
combination performance exceeds the CEO3 requirements of
MIL-STD-461C.
The filter operates at full load over the temperature range of
-55°C to +125°C case. Above +125°C, the current must be
derated as specified on page two.
p
ackaging
i
nSertion
l
oSS
The maximum DC insertion loss for the SFMC28-461 filter (at
a load of 22 watts) represents a power loss of less than 2% at
nominal input voltage.
SFMC28-461 EMI filters are encased in high-reliability, hermet-
ically-sealed metal packages and weigh just 48 grams. A small
footprint of 2.100 Inches (53.34 mm) by 1.115 inches (28.32 mm)
by 0.400 inches (10.16 mm) minimizes the board area needed
for the filter.
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • power@crane-eg.com
www.interpoint.com
SFMC28-461 Rev E - 20100628
Page 1 of 11
Crane Aerospace & Electronics Power Solutions
sFMc28-461 eMi input Filters
28 Volt input – 2.7 aMp
Operating COnditiOns and CharaCteristiCs
input Voltage range
•
0 to 50 VDC continuous
meChaniCal and envirOnmental
size (maximum)
•
Non-flanged
‣
2.100 x 1.115 x 0.400 (53.34 x 28.32 x 10.16 mm)
‣
See case H1 for dimensions
•
Flanged
‣
2.910 x 1.115 x 0.400 inches (73.91 x 28.32 x 10.16 mm)
‣
See case K2 for dimensions
Weight (maximum)
•
48 grams typical
lead soldering temperature (10 sec per pin)
•
300°C
storage temperature range (t
c
)
•
65°C to +150°C
isolation (t
c
= 25°c)
•
100 megohm minimum at 500 VDC
•
Any pin to case, except case pin
Derating output power/current
•
Derate linearly from 100% at 125°C to 0% at 135°C case
case operating temperature (t
c
)
•
-55°C to +125°C full power
screening
•
Space Prototype (O), Class H, or Class K.
•
Radiation tolerant to Radiation Hardness Assurance (RHA)
levels of “-” (O) or “H”, per MIL-STD-38534. Interpoint model
numbers use an “O” in the RHA designator position to indicate
the “-” (dash) Radiation Hardness Assurance level of MIL-PRF-
38534, which is defined as “no RHA”.
•
See Screening Tables 1, 2 and 3 for more information.
Available configurations: OO, HH, KH
EMI FILTER
DC/DC CONVERTER
+Vin
Case
Output
Input
Common Common
+Vout
+Vin
+Vout
RL
Case
Output
Input
Common Common
Multiple units
allowed up to
rated output
current of filter*
RL
Output impedance of the filter must be less than the combined
input impedance of the DC/DC converters.
F
igure
1: c
onnection
d
iagram
www.interpoint.com
SFMC28-461 Rev E - 20100628
Page 2 of 11
Crane Aerospace & Electronics Power Solutions
sFMc28-461 eMi input Filters
28 Volt input – 2.7 aMp
MoDel nuMbering key
Base Model
SFMC28 - 461
F
/ K
H
DSCC D
rawing
(5915)
94010H02HXC
94010H02HZC
94010H02HXC
94010H02HZC
Dscc nuMbers
SFMC28-461
S
iMilar
P
art
SFMC28-461/HH
SFMC28-461F/HH
SFMC28-461/KH
SFMC28-461F/KH
MIL-STD-461 compliant
Package Option
(Non-flanged package has
no designator in this position)
Screening
Radiation Hardness
Assurance (RHA)
For exact specifications for a DSCC product, refer to the
DSCC drawing. DSCC drawings can be downloaded
from: http://www.dscc.dla.mil/programs/smcr
O
n the lineS belOw
,
enter One SeleCtiOn FrOM eaCh CategOry tO DeterMine the
MODel nuMber
.
category
sFMc28-461
Base Model and
Input Voltage
SFMC28-461 is the
only available selec-
tion
Case Option
1
(stanDarD, leave blank)
F (flanged)
MoDel selection
/
_______
RHA
3
o
H
Screening
2
o
H
k
selection
Notes:
1. Case Options: For the standard case, case H1, leave the case option blank. For the flanged case option, case K2, insert the letter F
in the Case Option position.
2. Screening: A screening level of O is a Space Prototype and is only used with RHA O. See Screening Tables 2 and 3 for more infor-
mation. “H” indicates Class H and “K” indicates Class K of MIL-PRF-38534.
4. RHA: Interpoint model numbers use an “O” in the RHA designator position to indicate the “-” (dash) Radiation Hardness Assurance
level of MIL-PRF-38534, which is defined as “no RHA.” RHA O is only available with Screening level O. See Screening Table 3 for
more information.
www.interpoint.com
SFMC28-461 Rev E - 20100628
Page 4 of 11
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