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
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
Positive
Input
20
�½
0.65
�½
6800 pF
500 V
>285
�½H
6
�½H
6
�½H
x2
6800 pF / 500 V
Positive
Output
2
�½F
2
�½F
20
�½
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
F
igure
1: S
ChematiC
– t
ypiCal
V
alueS
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
�½S.
C = 6
�½F
Ceramic
R = 2.2 , 5%, 1/4 W, Carbon comp.
Multiple units
allowed up to
rated output current.
RL
F
igure
2: D
amping
C
irCuit
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Rev A - 20070509
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