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Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 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 0.8 A throughput current 55 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) 0.8
DESCRIPTION
The STF28-461TM 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-STD461C, Method CE03. 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.
For SMHF and SLH converters a 4 F (or greater) ceramic cap is needed between the filter and converter to complete the last inductive stage of this STF filter. This will ensure unconditional stability when used with the SMHF or SLH. The SMSA does not require this.
OptiOnal Damping CirCuit
OperatiOn
The SMSA power converter has an internal 2 F ceramic 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 SLH 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.
The optional damping circuit (Figure 2) can be used to prevent filter overshoot caused by MIL-STD-704A 80 V, or other, transients having rise times of less than 200 Sec. This damping can be alternately provided with a 1.50 V resistor in series with the filter positive input where the additional line loss can be tolerated. For transients with rise times of greater than 200 Sec, there is no overshoot and the damping circuit is not required.
SCreening
The STF28-461 filter offers three screening options: 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 descriptions.
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 10 Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 aMP
Operating COnditiOns and CharaCteristiCs
Input Voltage Range * 0 to 50 VDC continuous lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -65C to +150C Case Operating Temperature (Tc) * -55C to +125C full power Derating Input/Output Current * Derate linearly from 100% at 125C to 0% at 135C case. Capacitance * 0.045 F max, any pin to case Isolation * 100 megohm minimum at 500 VDC * Any pin to case, except case pin
meChaniCal and envirOnmental
Size (maximum) 0.980 x 0.805 x 0.270 (24.89 x 20.45 x 6.86 mm) See case A1 for dimensions. Weight (maximum) 10.3 grams typical, 11.5 grams maximum 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 "Class H and K, MIL-PRF-38534 Screening" tables for more information. Available configurations: OO, HH, KH
Positive Input 20
0.65 6800 pF 500 V
>285 H
6 H
6 H x2 6800 pF / 500 V
Positive Output
2 F
2 F
20 Input Common
6800 pF 500 V
x2 6800 pF / 500 V
Output Common
STF28-461
The case ground connection between the filter and the converter should be as low an impe ance as possible to minimize EMI. Direct contact of baseplate to chassis ground provides the
Figure 1: SChematiC - typiCal ValueS
STF28-461 Positive Input Positive Output Case Ground Input Common Output Common
DC/DC Converter Positive Input Case Ground Input Common Output Common Positive Output RL
C R
The RC output is an optional damping circuit. It is recommended in applications where 80 volt line transients may occur with rise times <50 S. C = 6 F Ceramic R = 2.2 , 5%, 1/4 W, Carbon comp.
Multiple units allowed up to rated output current.
RL
Figure 2: Damping CirCuit www.craneae.com
Page 2 of 10 Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 aMP
pin OUt
Pin 1 2, 3 4 5, 6 7 8 Designation Positive Input Positive Output Case Ground Output Common Input Common Case Ground
Squared corner and dot on top of cover indicate pin one.
1
7
BOTTOM 8 VIEW STF
23 4 65
See case A1 for dimensions.
Figure 3: pin Out
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Page 3 of 10 Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 aMP
mOdel nUmbering key
Base Model Screening STF28 - 461 / KH
dsCC nUmber
DSCC Drawing (5915) 96003H02HxA 96003H02HxC 96003H02KxA 96003H02KxC StF28-461 Filter Similar part STF28-461/HH STF28-461/HH STF28-461/KH STF28-461/KH
MIL-STD-461 Reference
For exact specifications for a DSCC product, refer to the DSCC drawing. SMDs can be downloaded from: http://www.dscc.dla.mil/programs/smcr
mOdel seleCtiOn
STF28Base model 461 MIL-STD-461 compliant / screening
Choose one from each of the following rows Screening OO* - Space prototype, HH, KH
*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 10 Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 aMP
Electrical Characteristics: 25C Tc, nominal Vin, unless otherwise specified.
STF28-461
parameter input VOltage input Current1 nOiSe reJeCtiOn 500 kHz 1 MHz 5 MHz DC reSiStanCe (rDC) Output VOltage Output Current pOwer DiSSipatiOn at maXimum Current tC = 25C SteaDy State SteaDy State COnDitiOnS COntinuOuS min 0 -- 50 50 45 -- typ 28 -- -- -- -- -- maX 50 0.80 -- -- -- 1.2 V VDC A W dB unitS VDC A
VOUT = VIN - IIN(RDC) -- -- 0.80 -- -- 1.15
Notes: 1. Guaranteed by design, not tested.
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Page 5 of 10 Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 aMP
Typical Performance Curves: 25C Tc, nominal Vin, unless otherwise specified.
90 80 A) 70 60 50 40 30 20 10 0
CE
03
NARROWBAND
EMISSION LEVEL (dB
LI
M
IT
.015
0.1
1 FREQUENCY (MHz)
10
50
MSA2805S converter without a filter.
Figure 4
90 80 A) 70 60 50 40 30 20 10 0
CE
03
NARROWBAND
LI
EMISSION LEVEL (dB
M
IT
.015
0.1
1 FREQUENCY (MHz)
10
50
MSA2805S converter at full load with an STF28-461 EMI filter.
Figure 5
10.0
MAGNITUDE OF Zo (Ohms)
3.2 1.0
0.32 0.10
2 F external capacitor on filter output
1K
10K 100K FREQUENCY (Hz)
1M
Typical output impedance (Z) with input shorted. STF28-461 EMI filter.
Figure 6
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Page 6 of 10 Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filter Cases
28 VOlT INPuT - 0.8 aMP
BOTTOM VIEW CASE A1
Seam Seal Projection Weld
0.805 max. (20.45) 0.697 (17.70) 0.397 (10.08) 0.097 (2.46) 0.000 0.270 max (6.98) 0.000 0.000 0.270 max (6.86) 0.27 0.02 (6.9 0.5) 0.27 0.02 (6.9 0.5) 0.000
Squared corner and dot on top of case indicate pin one.
1 8 7 23 4 65
0.135 (3.43)
0.735 (18.67) 0.835 (21.21)
0.018 0.002 dia. (0.46 0.05) Seal hole: 0.056 0.002 (1.42 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 Kovar/Nickel/Gold Cover Kovar/Nickel Pins Kovar/Nickel/Gold matched glass seal
Case A1, 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 4: CaSe a1
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Page 7 of 10 Rev A - 20070509
0.980 max. (24.89)
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 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 SEM SLAMTM/C-SAM: Input capacitors only (Add'l test, not req. by H or K) 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
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 8 of 10 Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 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
Class K, QMl yes yes yes yes yes yes
no yes yes yes no 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 yes3 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 9 of 10 Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 VOlT INPuT - 0.8 aMP
Class H and K, MIl-PRF-38534 RadIatIon assuRanCE
PRODuCT lEVEl aVaIlabIlITy ENVIRONMENTal SCREENING lEVElS SPaCE PROTOTyPE O ClaSS H ClaSS K non-QMl3 QMl QMl
RaDIaTION HaRDNESS aSSuRaNCE lEVElS O2: Standard, no radiation guarantee
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".
STF EMI Input Filters, Rev A - 20070509. 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. STF Series is a trademark of Interpoint. Copyright (c) 1999 - 2007 Interpoint Corporation. All rights reserved. www.craneae.com
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