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
• Compatible with
MIL-STD-704E
DC power bus
EMI I
NPUT
F
ILTER
28 V
OLT
I
NPUT
FMC EMI FILTER
2.7 AMP
MODEL
FMC-461
FMC-461NT
2.7 Amp
2.7 Amp
Size (max): Non-flanged, case H1
2.125 x 1.125 x 0.400 (53.98 x 28.58 x 10.16 mm)
Flanged, case K2
2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm)
See Section B8, cases H1 and K2, for dimensions.
Weight:
48 grams maximum
Screening: Standard, ES, or 883 (Class H). See Section C2 for
screening options, see Section A5 for ordering information.
DESCRIPTION
The FMC-461™ EMI filter has 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. It is intended for use in applications which have high
frequency switch-mode DC/DC converters and which must meet
MIL-STD-461C levels of conducted and radiated noise.
The FMC filter is built using thick-film hybrid technology and is
hermetically sealed in metal packages for military, aerospace, and
other high-reliability applications. The filter uses only ceramic
capacitors for reliable high temperature operation.
T
RANSIENT
S
UPPRESSION
The FMC-461 filter also features a fast-reacting (1 pico second)
transient suppressor which begins clamping the input voltage at
approximately 47 VDC, protecting the DC/DC converter from
damage from induced line transients.
O
PERATING
T
EMPERATURE
The filter is 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.
MIL-STD N
OISE
M
ANAGEMENT
When used in conjunction with Interpoint converters, the FMC-461
filter reduces input ripple current by 40 dB within the frequency band
of 200 kHz to 50 MHz. This gives the filter/converter combination a
performance which exceeds the CEO3 test of MIL-STD-461C.
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.
I
NSERTION
L
OSS
The maximum DC insertion loss for the FMC-461 filter (at a load of
22 watts) represents a power loss of less than 2% at typical input
voltage.
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.
B3-13
FMC EMI FILTER
2.7 AMP
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 0 to 40 VDC continuous
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
EMI I
NPUT
F
ILTERS
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous for 40 W load
Case Operating Temperature (Tc)
• –55°C to +125°C full power
Derating
• DC input and output current
Derate linearly from 100% at 125°C to 0%
at 135°C case
TYPICAL CHARACTERISTICS
Capacitance
• 0.038 µF max, any pin to case
Isolation
• 100 megohm minimum at 500 V
• Any pin to case, except case pin
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
—
—
—
—
—
V
OUT
= V
IN
- I
IN
(R
DC
)
—
—
MAX
40
49.4
49.4
54.2
2.7
—
—
—
0.20
MIN
0
—
—
—
—
40
50
40
—
FMC-461NT
1
TYP
28
—
—
—
—
—
—
—
—
V
OUT
= V
IN
- I
IN
(R
DC
)
MAX
40
—
—
—
2.7
—
—
—
0.20
UNITS
VDC
VDC
A
dB
dB
Ω
VDC
A rms
A
W
1.0
2.7
1.6
—
—
—
—
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.
B3-14
EMI I
NPUT
F
ILTERS
IN5649A
Positive
Input
1
6
F
1
F
6
F
277
H
35.6
H
FMC EMI FILTER
2.7 AMP
Positive
Output
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
PIN OUT
Dot on top of package indicates pin one
Pin
1
2
3
4
5
Designation
Positive Input
Positive Output
Case Ground
Output Common
Input Common
1
BOTTOM VIEW
FMC
NON-FLANGED AND FLANGED
5
2
3
4
Dotted line outlines flanged package option.
See Section B8, cases H1 and K2 for dimensions.
F
IGURE
2: P
IN
O
UT
DSCC NUMBER
DSCC D
RAWING
(5915)
FMC-461 F
ILTER
S
IMILAR
P
ART
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
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. See Section A3, “SMD/DSCC Lists”, for
more information.
B3-15
FMC EMI FILTER
2.7 AMP
EMI I
NPUT
F
ILTERS
90
Typical Performance Curves: 25°C Tc , nominal Vin, unless otherwise specified.
EMISSION LEVEL (dmA)
70
50
30
10
.015
0.1
1
10
50
FREQUENCY (MHz)
DC/DC Converter Typical Worst Case
EMI With FMC-461 Filter
F
IGURE
3
5
-15
Attenuation (dB)
-35
-55
-75
-95
1K
10 K
100 K
1M
FREQUENCY (Hz)
FMC-461 Typical Amplitude
Response vs. Frequency
F
IGURE
4
10
dB Ohms = 20 log Zout
0
-10
-20
1K
10 K
100 K
1M
FREQUENCY (Hz)
Typical Output Impedance (Z)
With Input Shorted
F
IGURE
5
B3-16
25621-001-DTS Rev A
DQ# 4003
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. FMC-461 is a trademark of Interpoint.
Copyright © 1991 - 1999 Interpoint. All rights reserved.
C
ASES
Dot on top of case indicates pin one
CASE H
CASE H
BOTTOM VIEW
See Figures 29 – 34
for pin configurations.
1.125 max
(28.58)
2.125 max
(53.98)
Materials
Header Cold Rolled Steel/Nickel/Gold
cases H1 and H2
Cold Rolled Steel/Nickel/Tin
cases H3, H4, and H5
Cover Kovar/Nickel
cases H1 and H2
Cold Rolled Steel/Nickel/Tin
cases H3, H4, and H5
Pins
#52 alloy
ceramic seal
case H1
case H2 (except MHV Series Single and Dual)
compression glass seal
MHV Series Single and Dual
case H3, H4, H5
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.
F
IGURE
28: C
ASE
H M
AXIMUM
D
IMENSIONS
BOTTOM VIEW CASE H1
FMC EMI Filter: Screening – Standard, ES, or 883
SFMC EMI Filter: Screening – Space Standard, H, or K
Seam Seal
0.040 dia
(1.02)
1.110 (28.19)
0.955 (24.26)
1
0.555 (14.1)
5
0.155 (3.94)
0.000
0.400 max.
(10.16)
0.000
0.25
±0.03
(6.4
±0.8)
0.000
0.245
(6.22)
1.845
(46.86)
2.090
(53.01)
4
2
3
Squared corner and dot on top
of case indicate pin one.
F
IGURE
29: C
ASE
H1
Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer
to the numerical dimensions for accuracy.
B8-17
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