Crane Aerospace & Electronics Power Solutions
FMC EMI Input Filters
28 VOLT INPUT – 2.7 AMP
F
EATURES
• –55°C to +125°C operation
• Up to 50 dB attenuation
400 kHz to 50 MHz
• Transient suppression
• Compliant to
MIL-STD-461C, CE03
and MIL-STD-461D, CE102
• Compatible with
MIL-STD-704 A-E
DC power bus
MODEL
FMC-461
FMC-461NT
2.7 Amp
2.7 Amp
DESCRIPTION
The FMC-461™ and SFMC EMI filters have been specifically
designed to reduce the input line reflected ripple current of
Interpoint’s MHF, MTR, MTO, MHV, MHF+, MHD, MTW, MHE, and
MLP series of DC/DC converters including their space counterparts.
The filter can be used to filter combinations of the lower power
converters up to two MTR/SMTR series converters and a single
MFL/SMFL series converters. They are intended for use in applica-
tions which have high frequency switch-mode DC/DC converters
and which must meet MIL-STD-461C or MIL-STD-461C levels of
conducted and radiated noise.
The FMC/SFC filters are built using thick-film hybrid technology and
is hermetically sealed in metal packages for military, aerospace, and
other high-reliability applications. The filters use only ceramic
capacitors for reliable high temperature operation.
T
RANSIENT
S
UPPRESSION
- FMC-461
ONLY
The FMC-461 filter also features an optional fast-reacting (1 pico
second) transient suppressor (transorb) which begins clamping the
input voltage at approximately 47 VDC, protecting the DC/DC
converter from damage from induced line transients.
The FMC-461NT does not have the transorb option.
O
PERATING
T
EMPERATURE
The filters are rated to operate, with no degradation of performance,
over the temperature range of -55°C to +125°C (as measured at the
baseplate). Above +125°C, current must be derated as specified on
the following page.
I
NSERTION
L
OSS
The maximum DC insertion loss for the FMC/SFMC filters (at a load
of 22 watts) represents a power loss of less than 2% at typical input
voltage.
MIL-STD N
OISE
M
ANAGEMENT
When used in conjunction with Interpoint converters, the FMC-461,
FMC-461 NT and SFMC-461 filters reduce input ripple current within
the frequency band of 100 kHz to 50 MHz. This gives the
filter/converter combination a performance which exceeds the
CEO3 test of MIL-STD-461C and the CE102 test of MIL-STD-461D.
Typical FMC-461 filter frequency response and output impedance
behavior are shown in Figures 4 and 5. CEO3 performance of a
typical converter with the FMC-461 filter connected is shown in
Figure 3.
L
AYOUT
R
EQUIREMENT
The case pin, and ideally the case, should be tied to the case of the
converter through a low-inductance connection.
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 C - 20060508
Crane Aerospace & Electronics Power Solutions
FMC EMI Input Filters
28 VOLT INPUT – 2.7 AMP
OPERATING CONDITIONS AND CHARACTERISTICS
Input Voltage Range
• 0 to 50 VDC continuous
• 16 to 40 VDC continuous for 40 W load
Lead Soldering Temperature (10 sec per pin)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
Case Operating Temperature (Tc)
• –55°C to +125°C full power
Derating Output Power/Current
• DC input and output current
Derate linearly from 100% at 125°C to 0%
at 135°C case
Input to Output Capacitance
• 0.038 μF max, any pin to case
Isolation
• 100 megohm minimum at 500 V
• Any pin to case, except case pin
MECHANICAL AND ENVIRONMENTAL
Size (maximum)
Non-flanged
2.125 x 1.125 x 0.400 inches (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
Standard, ES, or 883 (Class H). See “883, Class H, QML Products – Element
Evaluation” and “883, Class H, QML Products – Environmental
Screening” for more information.
IN5649A
Positive
Input
1
277
H
35.6
H
Positive
Output
6
F
6
F
1
F
68
Input
Common
1
4.7
Output
Common
1
3300 pF / 500 V
FMC-461
FMC-461/883
6800 pF / 500 V
(4 times)
The case ground connection between the filter and the converter should be as low an impedance as possible
to minimize EMI. Direct contact of baseplate to chassis ground provides the lowest impedance.
F
IGURE
1: S
CHEMATIC
– T
YPICAL
V
ALUES
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Page 2 of 10
Rev C - 20060508
Crane Aerospace & Electronics Power Solutions
FMC 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
Case ground (pin 3)
PINS NOT IN USE
Connect to case ground for
optimum filtering
Dot on top of package indicates pin one
1
BOTTOM VIEW
FMC
NON-FLANGED AND FLANGED
5
2
3
4
Dotted line outlines flanged package option.
See case H1 and case K2 for dimensions.
F
IGURE
2: P
IN
O
UT
www.craneae.com
Page 3 of 10
Rev C - 20060508
Crane Aerospace & Electronics Power Solutions
FMC EMI Input Filters
28 VOLT INPUT – 2.7 AMP
MODEL NUMBERING KEY
FMC - 461
Base Model
MIL-STD-461 Reference
No Transorb Option
(Standard FMC-461 has no designator
in this position)
Case Option
(Non-flanged case has no designator in
this position)
Screening
(Standard screening has no designator
in this position.)
NT
F
/ 883
DSCC NUMBER
DSCC D
RAWING
(5915)
FMC-461 F
ILTER
S
IMILAR
P
ART
94010-01HXC
FMC-461/883
94010-01HZC
FMC-461F/883
94010-02HXC
1
FMC-461NT/883
1
1
94010-02HZC
FMC-461NTF/883
1
1. No transorb (NT)
Flanged SMDs have the suffix HZC instead of HXC.
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
Model Selection
FMC
Base model
461
MIL-STD-461 ref.
No Transorb option
case option
Screening
Choose one from each of the following rows
No Transorb option
Case option
Screening
NT or leave blank
non-flanged (case H1, leave blank)
standard screening, leave blank
or F (flanged, case K2)
/ES (ES screening), /883 (Class H, QML)
www.craneae.com
Page 4 of 10
Rev C - 20060508
Crane Aerospace & Electronics Power Solutions
FMC EMI Input Filters
28 VOLT INPUT – 2.7 AMP
Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified.
PARAMETER
INPUT VOLTAGE
INPUT CLAMPING
VOLTAGE
INPUT CURRENT
DIFFERENTIAL MODE
NOISE REJECTION
COMMON MODE
NOISE REJECTION
DC RESISTANCE (R
DC
)
OUTPUT VOLTAGE
2
OUTPUT CURRENT
INTERNAL POWER
DISSIPATION
CONDITIONS
CONTINUOUS
–55°C
25°C
125°C
200 kHz
400 kHz - 50 MHz
2 MHz - 50 MHz
TC = 25°C
STEADY STATE
RIPPLE
STEADY STATE
MAXIMUM CURRENT
MIN
0
40.8
44.7
44.7
—
40
50
40
—
FMC-461
TYP
28
45.1
47.0
49.5
—
—
—
—
—
MAX
40
49.4
49.4
54.2
2.7
—
—
—
0.20
MIN
0
—
—
—
—
40
50
40
—
FMC-461NT
1
TYP
28
—
—
—
—
—
—
—
—
MAX
40
—
—
—
2.7
—
—
—
0.20
UNITS
VDC
VDC
A
dB
dB
Ω
VDC
A rms
A
W
V
OUT
= V
IN
- I
IN
(R
DC
)
—
—
—
—
1.0
2.7
1.6
—
—
V
OUT
= V
IN
- I
IN
(R
DC
)
—
1.0
—
2.7
1.6
—
—
—
—
Notes
1. The FMC-461NT does not have a transorb and does not clamp the input voltage
2. Typical applications result in Vout within 2% of Vin.
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Page 5 of 10
Rev C - 20060508
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