CRANE STF28

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
• -55°C to +125°C 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
DESCRIPTION
The STF28-461™ 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.
Operation
The SMSA power converter has an internal 2 µF 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.
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • [email protected]
www.craneae.com
Current (A)
0.8
For SMHF and SLH converters a 4 µF (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
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 µSec. 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 µSec, 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.
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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)
•300°C
Storage Temperature Range (Case)
•-65°C to +150°C
Case Operating Temperature (Tc)
•-55°C to +125°C full power
Derating Input/Output Current
•Derate linearly from 100% at 125°C to 0% at 135°C case.
Capacitance
•0.045 µF max, any pin to case
Isolation
•100 megohm minimum at 500 VDC
•Any pin to case, except case pin
0.65 �
Positive
Input
20 �
20 �
Input
Common
>285 �H
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-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
6 �H
6 �H
6800 pF
500 V
x2
6800 pF / 500 V
2 �F
2 �F
x2
6800 pF / 500 V
6800 pF
500 V
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
DC/DC Converter
Positive
Output
C
Case
Ground
Input
Common
R
Output
Common
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 Ω, 5%, 1/4 W, Carbon comp.
Positive
Input
Case
Ground
Input
Common
RL
Output
Common
Multiple units
allowed up to
rated output current.
Figure 2: Damping Circuit
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Positive
Output
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Rev A - 20070509
RL
Positive
Output
Output
Common
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
BOTTOM
8
VIEW
STF
7
2 3
4
6 5
See case A1 for dimensions.
Figure 3: Pin Out
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Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 Volt input – 0.8 AMP
model numbering key
Base Model
STF28 - 461
/
dscc number
KH
MIL-STD-461 Reference
Screening
DSCC Drawing
(5915)
STF28-461 Filter
Similar Part
96003H02hxA
96003H02HXC
96003H02KXA
96003H02KXC
STF28-461/HH
STF28-461/HH
STF28-461/KH
STF28-461/KH
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
STF28-
Base 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 of 10
Rev A - 20070509
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 Volt input – 0.8 AMP
Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified.
sTF28-461
PARAMETER
CONDITIONS
MIN
INPUT VOLTAGE
CONTINUOUS
0
28
—
—
INPUT CURRENT1
NOISE REJECTION
DC RESISTANCE (RDC)
50
0.80
50
—
—
1 MHz
50
—
—
5 MHz
45
—
—
TC = 25°C
—
STEADY STATE
OUTPUT CURRENT
STEADY STATE
—
1.2
VOUT = VIN - IIN(RDC)
—
—
0.80
—
Notes:
1. Guaranteed by design, not tested.
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MAX
500 kHz
OUTPUT VOLTAGE
POWER DISSIPATION
AT MAXIMUM CURRENT
TYP
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Rev A - 20070509
—
1.15
UNITS
VDC
A
dB
V
VDC
A
W
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filters
28 Volt input – 0.8 AMP
Typical Performance Curves: 25°C Tc, nominal Vin, unless otherwise specified.
90
EMISSION LEVEL (dB
A)
80
CE
70
NARROWBAND
03
60
LI
M
IT
50
40
30
20
10
0
.015
0.1
1
FREQUENCY (MHz)
10
50
MSA2805S converter without a filter.
Figure 4
90
EMISSION LEVEL (dB
A)
80
70
60
CE
03
NARROWBAND
LI
M
IT
50
40
30
20
10
0
.015
0.1
1
FREQUENCY (MHz)
10
50
MSA2805S converter at full load with an
STF28-461 EMI filter.
Figure 5
MAGNITUDE OF Zo (Ohms)
10.0
3.2
1.0
0.32
0.10
1K
2 µF external capacitor on filter output
10K
100K
FREQUENCY (Hz)
Typical output impedance (Z) with input
shorted. STF28-461 EMI filter.
Figure 6
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Rev A - 20070509
1M
Crane Aerospace & Electronics Power Solutions
STF28-461 EMI Input Filter Cases
28 Volt input – 0.8 AMP
BOTTOM VIEW CASE A1
Projection Weld
0.805 max. (20.45)
0.697 (17.70)
1
2 3
8
4
7
6 5
0.397 (10.08)
0.000
0.135 (3.43)
0.27 ±0.02
(6.9 ±0.5)
0.000
0.270 max
(6.98)
0.27 ±0.02
(6.9 ±0.5)
0.000
0.270 max
(6.86)
0.097 (2.46)
0.000
0.018 ± 0.002 dia.
(0.46 ± 0.05)
0.980 max. (24.89)
Squared corner and dot on
top of case indicate pin one.
0.735 (18.67)
0.835 (21.21)
Seam Seal
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 300°C 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 © 1999-2006 Interpoint Corp. All rights reserved.
Figure 4: Case A1
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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 Element Evaluation
Space
Test Performed
Prototype O
Class H
non-QML1
QML
(component level)
M/S2 P3
M/S2 P3
Class K
QML
M/S2 P3
Element Electrical
yes
no
yes yes
yes yes
Element Visual
no
no
yes yes
yes yes
Internal Visual
no N/A
yes N/A
yes N/A
Temperature Cycling
no
no
no
no
yes yes
Constant Acceleration
no
no
no
no
yes yes
Interim Electrical
no N/A
no N/A
yes N/A
Burn-in
no N/A
no N/A
yes N/A
Post Burn-in Electrical
no N/A
no N/A
yes N/A
Steady State Life
no N/A
no N/A
yes N/A
Voltage Conditioning Aging
N/A
no
N/A
no
N/A yes
Visual Inspection
no
no
N/A
no
N/A yes
Final Electrical
no
no
yes yes
yes yes
Wire Bond Evaluation4
no
no
yes yes
yes yes
SEM
SLAM™/C-SAM:
Input capacitors only
(Add’l test, not req. by H or K)
no N/A
no N/A
yes N/A
no
no yes
no yes
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
SLAM™: Scanning Laser Acoustic Microscopy
C-SAM: C - Mode Scanning Acoustic Microscopy
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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
Space
Prototype O
(end item level)
non-QML1
2
Non-destruct bond pull
Method 2023
no
Pre-cap Inspection
Method 2017, 2032
yes
Temperature Cycle (10 times)
Method 1010, Cond. C, -65°C to 150°C, ambient
yes
Constant Acceleration
Method 2001, 3000 g
yes
PIND Test
Method 2020, Cond. A
no
Pre burn-in test
yes
Burn-in
Method 1015, 125°C case, typical
96 hours yes
160 hours no
2 x 160 hour (includes mid BI test)
no
Final electrical test MIL-PRF-38534
Group A, Subgroups 1 through 6
-55°C, +25°C, +125°C case
yes
Radiography
Method 2012
N/A
Post Radiography Electrical Test
Room temperature
N/A
Hermeticity test
Fine Leak, Method 1014, Cond. A
yes
Gross Leak, Method 1014, Cond. C
yes
Final visual inspection
Method 2009
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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Rev A - 20070509
Class
H, QML
Class
K, QML
yes3
yes
yes
yes
yes
yes
yes
yes
yes3
yes
yes
yes
no yes
no
no
no
yes
yes
yes
N/A
yes
N/A
yes3
yes
yes
yes
yes
yes
yes
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 AvailabilityEnvironmental Screening Levels
space
Prototype O Class H Class K
Radiation Hardness
non-QML3
QML
QML
Assurance Levels
O2: Standard, no radiation guarantee OO
HO
N/A
H1, 5: Radiation tolerant – Tested lots
Up to 1,000 K Rads (Si) total dose
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 © 1999 - 2007 Interpoint Corporation. All rights reserved. www.craneae.com
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