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Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 AMp
Features * * * * * * * * Fully qualified to Class H or K
Passive components used for maximum tolerance in space environments -55C to +125C operation Nominal 28 V input, 0 V to 50 V operation Up to 2.7 A throughput current 60 dB attenuation typical at 500KHz Compliant to MIL-STD-461C CE-03 Compatible with MIL-STD-704 A-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.
Derating according to the requirements of MIL-STD-975 assures dependable performance in the harsh environments of space. Compliance to MIL-STD-975 derating is achieved at or below case operating temperatures of 90C. 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-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 "Class H and K, MIL-PRF-38534 Screening" tables 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 For Space
inSertion loSS Filter deSign
The maximum DC insertion loss for the SFMC28-461 filter (at a load of 22 watts) represents a power loss of less than 2%. SFMC28-461 filters incorporate thick-film hybrid technology and use only high quality ceramic capacitors for reliable high temperature operation.
SFMC28-461 EMI filters are encased in high-reliability, hermetically-sealed metal packages and weigh just 48 grams. A small footprint of 2.110 Inches (53.59 mm) by 1.115 inches (28.32 mm) by 0.400 inches (10.16 mm) minimizes the board area needed for the filter. Cover marking inks are NASA approved to Total Mass Loss (TML) and Collected Volatile Condensable Material (CVCM) outgassing requirements for operation in space environments.
Crane Aerospace & Electronics Electronics Group (Interpoint Brand) PO Box 97005 * Redmond WA 98073-9705 425.882.3100 * electronics@craneae.com www.craneae.com
Page 1 of 11 Rev D - 20070404
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 AMp
input Voltage range * 0 to 50 VDC continuous lead soldering temperature (10 sec per pin) * 300C storage temperature range (case) * -65C to +150C case operating temperature (tc) * -55C to +125C full power Derating output power/current * Derate linearly from 100% at 125C to 0% at 135C case input to output capacitance * 0.048 F max., any pin to case isolation * 100 megohm minimum at 500 VDC * Any pin to case, except case pin
Operating COnditiOns and CharaCteristiCs
meChaniCal and envirOnmental
size (maximum) Non-flanged 2.125 x 1.125 x 0.400 (53.98 x 28.58 x 10.16 mm) See case H1 for dimensions. Flanged 2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm) See case K2 for dimensions. Weight (maximum) 48 grams typical 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 "Class H and K, MIL-PRF-38534 Screening" tables for more information. Available configurations: OO, HH, KH
EMI FILTER
DC/DC CONVERTER
+Vin
+Vout
+Vin
+Vout RL
Case Output Input Common Common
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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Page 2 of 11 Rev D - 20070404
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 AMp
pin OUt
Pin 1 2 3 4 5 Designation Positive Input Positive Output Case Ground Output Common Input Common
Dot on top of package indicates pin one
1 BOTTOM VIEW SFMC NON-FLANGED AND FLANGED 5
2 3 4
Dotted line outlines flanged package option.
See cases H1 and K2 for dimensions.
FIgure 2: pIn out
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Page 3 of 11 Rev D - 20070404
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 AMp
mOdel nUmbering key
Base Model MIL-STD-461 compliant Package Option (Non-flanged package has no designator in this position) Screening SFMC28 - 461 F / KH
dsCC nUmber
DSCC Drawing (5915) 94010H02HXC 94010H02HXC 94010H02KXC 94010H02KZC SFMC28-461 Filter Similar Part SFMC28-461/HH SFMC28-461f/HH SFMC28-461/KH SFMC28-461/KH
Flanged SMDs have the suffix HZC in place of HXC. Interpoint's DSCC drawing models are similar in perfo mance and dimensions to standard models, however, slight differences in specifications may exist. Refer to the DSCC drawing for the exact specifications. DSCC drawings can be downloaded from: http://www.dscccols.com/programs/smcr
mOdel seleCtiOn
SFMC28Base model 461 MIL-STD-461 compliant case option / screening
Choose one from each of the following rows: Case option Screening non-flanged, leave blank OO* - Space prototype, HH, KH F - flanged
*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"
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Page 4 of 11 Rev D - 20070404
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 AMp
Electrical Characteristics: 25C Tc, nominal Vin, unless otherwise specified.
SFMC28-461
parameter Input Voltage Input Current noISe reJeCtIon 500 kHz 1 MHz 5 MHz output Voltage1 output Current reFleCted rIpple Current poWer dISSIpatIon at maXImum Current dC reSIStanCe (rdC) tC = 25C SteadY State SteadY State From ConVerter to FIlter CondItIonS ContInuouS mIn 0 -- 55 60 60 -- -- -- -- tYp 28 -- -- -- -- -- maX 50 2.7 -- -- -- 0.20 V VDC A A W dB unItS VDC A
VOUT = VIN - IIN(RDC) -- 2.7 -- -- 1.0 1.5
Notes 1. Typical applications result in Vout within 2% of Vin.
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Page 5 of 11 Rev D - 20070404
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/DC Converter Typical Worst Case EMI With SFMC-461 Filter 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
Typical Output Impedance (Z) With Input Shorted FIgure 5
FREQUENCY (MHz)
100K
1M
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Page 6 of 11 Rev D - 20070404
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)
1.110 max. (28.19) 0.955 (24.26)
Squared corner and dot on top of case indicate pin one.
1 2 3
0.555 (14.1) 5
0.155 (3.94) 0.000 0.400 max. (10.16) 0.25 0.01 (6.4 0.3) 0.000 0.000
4
0.245 (6.22)
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
Case H1, Rev C, 20060110 Please refer to the numerical dimensions for accuracy. All 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. Copyright (c) 1999-2006 Interpoint Corp. All rights reserved.
FIgure 6: CaSe H1
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Page 7 of 11 Rev D - 20070404
2.090 max. (53.01)
1.845 (46.86)
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)
1.110 max. (28.19) 0.955 (24.26)
Dot on top of case indicates pin one
1 0.555 (14.1) 5
2 3
0.162 dia (4.11)
0.155 (3.94) 0.000
4
0.245 (6.22)
1.845 (46.86)
2.090 (53.01)
0.230 (5.84)
2.320 (58.93)
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
Case K2, Rev C, 20060110 Please refer to the numerical dimensions for accuracy. All 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. Copyright (c) 1999-2006 Interpoint Corp. All rights reserved.
FIgure 7: CaSe K1
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Page 8 of 11 Rev D - 20070404
2.910 max. (73.91)
0.400 max. (10.16)
0.25 0.03 (6.4 0.8)
0.000
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
teSt perFormed (component level) 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 Wire Bond Evaluation4 Space prototype o
non-Qml1 m/S2 p3
claSS H Qml m/S2 p3 yes yes yes no no no no no no N/A N/A yes yes no no yes yes N/A no no N/A N/A N/A N/A no no yes yes N/A yes
claSS k Qml m/S2 p3 yes yes yes yes yes yes yes yes yes N/A N/A yes yes yes no yes yes N/A yes yes N/A N/A N/A N/A yes yes yes yes N/A yes
yes no no no no no no no no N/A no no no no no
no no N/A no no N/A N/A N/A N/A no no no no N/A no
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 4. Not applicable to EMI filters that have no wirebonds. 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
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Page 9 of 11 Rev D - 20070404
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
teSt perFormed (end item level) Non-destruct bond pull2 Method 2023 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 hour (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
claSS H, Qml yes3 yes yes yes yes3 yes no yes no yes N/A N/A yes yes yes
claSS k, Qml yes yes yes yes yes yes no no yes yes yes yes3 yes yes yes
no yes yes yes no yes yes no no yes N/A N/A 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 applicable to EMI filters that have no wirebonds. 3. Not required by DSCC but performed to assure product quality.
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Page 10 of 11 Rev D - 20070404
Crane Aerospace & Electronics Power Solutions
SFMC28-461 eMi input Filters
28 Volt input - 2.7 AMp
claSS H and k, mil-prF-38534 radiation aSSurance
proDuct leVel AVAilAbility rADiAtion HArDness AssurAnce leVels o2: Standard, no radiation guarantee enVironMentAl screening leVels spAce prototype o clAss H clAss K non-QMl3 QMl QMl
OO H1, 5: Radiation tolerant - Tested lots Up to 1,000 K Rads (Si) total dose
HO
N/A
N/A
HH4
KH4
Notes: 1. Our EMI filters are designed exclusively with passive components providing maximum tolerance for space environment requirements. 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. Space Prototype (O), non-QML products, do not meet all of the requirements of MIL-PRF-38534. 4. Redmond site, Interpoint, has a Radiation Hardness assurance plan on file with DSCC. Our SMD products with RHA "H" code meet DSCC requirements. 5. Space filters are only available with Radiation Hardness Assurance (RHA) levels of "O" and "H".
SFMC EMI Filters, Rev D - 20070404. This revision supercedes 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. SFMC Series is a trademark of Interpoint. Copyright (c) 1999 - 2007 Interpoint Corporation. All rights reserved. www.craneae.com
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