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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 +125C
* 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
input Voltage and current Input (V) 28 Current (A) 2.7
Description
The SFMC28-461TM 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.
Filter deSign
SFMC28-461 filters incorporate thick-film hybrid technology and use only high quality ceramic capacitors for reliable high temperature 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 environmental 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 evaluation (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.
Screening
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.
operating temperature
ripple reduction
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 -55C to +125C case. Above +125C, the current must be derated as specified on page two.
packaging
inSertion loSS
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, hermetically-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) POBox97005*RedmondWA98073-9705 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) * 300C storage temperature range (tc) * 65C to +150C
isolation (tc = 25c) * 100 megohm minimum at 500 VDC * Any pin to case, except case pin
Derating output power/current * Derate linearly from 100% at 125C to 0% at 135C case
case operating temperature (tc) * -55C to +125C 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-PRF38534, 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. Figure 1: connection diagram
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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
pin 1 2 3 4 5
pin out
Positive Input Case Ground
Designation
Positive Output Output Common Input Common
Dot on top of package indicates pin one
1
BOTTOM VIEW SFMC NON-FLANGED AND FLANGED
2 3 4
5
Dotted line outlines flanged package option.
See cases H1 and K2 for dimensions.
Figure 2: pin out
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SFMC28-461 Rev E - 20100628
Page 3 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 Drawing (5915) 94010H02HXC 94010H02HZC 94010H02HXC 94010H02HZC
Dscc nuMbers
SFMC28-461 SiMilar Part 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
On the lineS belOw, enter One SeleCtiOn FrOM eaCh CategOry tO DeterMine the
MODel nuMber.
MoDel selection
category
SFMC28-461
Base Model and Input Voltage SFMC28-461 is the only available selection Case Option 1 (stanDarD, leave blank) F (flanged)
/
_______
Screening 2 o H k RHA 3 o H
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 information. "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.
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SFMC28-461 Rev E - 20100628
Page 4 of 11
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 aMp
Electrical Characteristics: -55 to +125C TC, nominal Vin unless otherwise specified.
MODEL
parameter input Voltage noiSe reJection conditionS continuouS 500 kHz 1 mHz 5 mHz dc reSiStance (rdc) output Voltage 2 capacitance output current reFlected ripple current 1 25c SteadY State anY pin to caSe tc = 25c SteadY State From conVerter to Filter MIN 0 55 60 60 --
SFMC28-461
TYP 28 60 -- -- -- MAX 50 -- -- -- 0.2 dB VDC pF A ARMS W unitS VDC
VOUT = VIN - IIN (RDC) -- -- -- -- -- -- -- -- 48,000 2.7 1.0 1.5
poWer diSSipation 1 at maXimum current
Notes 1. guaranteed by design, not tested. 2. Typical applications result in Vout within 2% of Vin.
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SFMC28-461 Rev E - 20100628
Page 5 of 11
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 aMp
Typical Performance Curves: 25C Tc , nominal Vin, unless otherwise specified.
90
EMISSION LEVEL (dB A)
70
CE03 Limit
50
30
10
.015
0.1
FREQUENCY (MHz)
1
10
50
DC/DCConverterTypicalWorstCase EMIWithSFMC-461Filter Figure 3
5
ATTENUATION (dB)
-15 -35
-55
-75
-95 1K
10K
FREQUENCY (MHz)
1M
SFMC-461 Typical Amplitude Response vs. Frequency Figure 4
dB OHMS = 20 LOG ZOUT
10
4.8
0
-10
-20 1K
10K
FREQUENCY (MHz)
100K
1M
Typical Output Impedance (Z) WithInputShorted Figure 5
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SFMC28-461 Rev E - 20100628
Page 6 of 11
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filter cases
28 Volt input - 2.7 aMp
BOTTOM VIEW CASE H1
Seam Seal
0.040 dia (1.02)
1.115 max. (28.32)
Squared corner and dot on top of case indicate pin one.
1 2 3
0.955 (24.26)
0.555 (14.1) 5
0.155 (3.94) 0.000 0.400 max. (10.16) 0.000 0.25 0.01 (6.4 0.3) 0.000
4
0.245 (6.22)
1.845 (46.86)
Seal hole: 0.120 0.002 (3.05 0.05)
Case dimensions in inches (mm) Tolerance 0.005 (0.13) for three decimal places 0.01 (0.3) 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. Materials Header Cold Rolled Steel/Nickel/Gold Cover Kovar/Nickel Pins #52 alloy/Gold, ceramic seal Seal hole 0.120 0.002 (3.05 0.05)
Case H1 Filters, Rev F, 20100429 Please refer to the numerical dimensions for accuracy.
Figure 6: caSe H1
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Page 7 of 11 SFMC28-461 Rev E - 20100628
2.100 max. (53.34)
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filter cases
28 Volt input - 2.7 aMp
BOTTOM VIEW CASE K2 Flanged cases: Designator "F" required in Case Option position of model number.
Seam Seal
0.040 dia (1.02)
1.115max. (28.32)
Dot on top of case indicates pin one
2 x Dia 0.162 0.002 (4.11 0.05)
0.955 (24.26) 1 0.555 (14.1) 5 2 3
2 x R 0.170 (4.32)
0.155 (3.94) 0.000
4
0.245 (6.22)
1.845 (46.86)
2.090 (53.01)
0.230 (5.84)
(2.910 max (73.91))
Flange thickness: 0.060 (1.52)
Case dimensions in inches (mm) Tolerance 0.005 (0.13) for three decimal places 0.01 (0.3) 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. Materials Header Cold Rolled Steel/Nickel/Gold Cover Kovar/Nickel Pins #52 alloy/Gold, ceramic seal. Seal Hole: 0.120 0.002 (3.04 0.05) Case K2 SFMC F, Rev F, 20100506
Figure 7: caSe k2
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Page 8 of 11 SFMC28-461 Rev E - 20100628
2.320 (58.93)
0.400 max. (10.16)
0.000
0.25 0.03 (6.4 0.8)
0.000
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 aMp
CLASS H AND K, MIL-PRF-38534 ELEMENT EVALUATION
COmpOnent-level test perFOrmed
spaCe prOtOtYpe (O) nOn-Qml1 M/S 2 P3
no no N/A no no N/A N/A N/A N/A no no no N/A no yes no no no no no no no no N/A no no no no yes yes yes no no no no no no N/A N/A yes no no
Class h Qml M/S 2 P3
yes yes N/A no no N/A N/A N/A N/A no no yes N/A yes
Class K Qml M/S 2
yes yes yes yes yes yes yes yes yes N/A N/A yes yes no
P3
yes yes N/A yes yes N/A N/A N/A N/A yes yes yes N/A yes
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 SEM SLAMTM/C-SAM: Input capacitors only (Add'l test, not req. by H or K)
Notes: 1. Non-QML products do not meet all of the requirements of MIL-PRF-38534. 2. M/S = Active components (Microcircuit and Semiconductor Die) 3. P = Passive components 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
SCREENING TABLE 1: ELEMENT EVALUATION
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SFMC28-461 Rev E - 20100628
Page 9 of 11
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 aMp
CLASS H AND K, MIL-PRF-38534 ENVIRONMENTAL SCREENING
end item-level test perFOrmed Pre-cap Inspection Method 2017, 2032 Temperature Cycle (10 times) Method 1010, Cond. C, -65C to 150C, ambient Constant Acceleration Method 2001, 3000 g PIND Test Method 2020, Cond. A Pre burn-in test Burn-in Method 1015, 125C case, typical 96 hours 160 hours 2 x 160 hours (includes mid-BI test) Final Electrical Test MIL-PRF-38534 Group A, Subgroups 1 through 6 -55C, +25C, +125C case Radiography Method 2012 Post Radiography Electrical Test Room temperature Hermeticity Test Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Final visual inspection Method 2009
spaCe prOtOtYpe (O) nOn-Qml1
yes
Class h Qml
yes
Class K Qml
yes
yes yes no yes
yes yes yes 2 yes
yes yes yes yes
yes no no
no yes no
no no yes
yes N/A N/A yes yes yes
yes N/A N/A yes yes yes
yes yes yes 2 yes yes yes
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Notes: 1. Space Prototype (O), non-QML products, do not meet all of the requirements of MIL-PRF-38534. 2. Not required by DSCC but performed to assure product quality.
SCREENING TABLE 2: ENVIRONMENTAL SCREENING
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SFMC28-461 Rev E - 20100628
Page 10 of 11
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 aMp
CLASS H AND K, MIL-PRF-38534 RADIATION HARDNESS ASSURANCE (RHA)
ENVIRONMENTAL SCREENING LEVELS RADIATION HARDNESS ASSURANCE LEVELS
O
2
SPACE PROTOTYPE (O)
NON-QML 1
CLASS H QML
N/A
CLASS K QML
N/A
Standard, no radiation guarantee OO
h 3 Radiation tolerant- Tested lots up to 1,000 kRads (Si) total dose, applies to EMI filters only
N/A
HH
KH
Notes: 1. Space Prototype (O), non-QML, products do not meet all of the requirements of MIL-PRF-38534. 2. 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" 3. Our EMI filters are designed exclusively with passive components providing maximum tolerance for space environment requirements.
SCREENING TABLE 3: RADIATION HARDNESS ASSURANCE
SFMC28-461 EMI Filters, SFMC28-461 Rev E - 20100628. This revision supersedes all previous releases. 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. SFMC28-461 Series is a trademark of Interpoint. Copyright (c) 1999 - 2010 Interpoint Corporation. All rights reserved. www.interpoint.com
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