NOT RECOMMENDED FOR NEW DESIGNS
Features
eMI I
NpuT
F
ILTerS
28 V
oLT
I
NpuT
FM-461, FMA-461
AND FMB-461
1.75 To 5 AMP
Attenuation 40 dB from 110 kHz to 50 MHz
• Operating temperature -55° to +85°C
• 1.75 to 5 A throughput current
• Transient suppression
• Nominal 28 V input, 0 V to 40 V operation
• Compliant to MIL-STD-461C CE-03
I
NpuT
(V)
0 - 40
0 - 40
0 - 40
I
NpuT
V
oLTage
aND
C
urreNT
MODELS
C
urreNT
(a)
1.75
3.8
5.0
Size (max.): Non-flanged case
H3 - FM-461 2.110 x 1.120 x 0.417 inches (53.59 x 28.45 x 10.59 mm)
H5 - FMA/FMB 2.110 x 1.120 x 0.495 inches (53.59 x 28.45 x 12.57* mm)
Flanged case
K4 - FM-461 2.910 x 1.115 x 0.417 inches (73.91 x 28.32 x 10.59* mm)
K6 - FMA/FMB 2.910 x 1.115 x 0.495 inches (73.91 x 28.32 x 12.57 mm)
Weight:
Maximum – FM-461 38 grams, FMA-461 42 grams, FMB-461 43 grams
Screening: Standard or ES. See screening table for more information.
Description
The FM-461, FMA-461, and FMB-461 EMI filter modules have
been specifically designed to reduce the input line reflected ripple
current of Interpoint’s MTO, MTW, MHE, MLP, and MFW Series
of DC/DC converters. They are intended for use in applications of
high frequency (100 kHz) switch-mode DC/DC converters which
must meet MIL-STD-461C levels of conducted power line noise.
These filters are built using thick-film hybrid technology and are
sealed in metal packages for military, aerospace, and other high-
reliability applications. See Section B8, cases H3, H5, K4, and
K6 for dimensions. See Section C2 for screening options.
F
ILTer
o
peraTIoN
A fast-reacting (1 picosecond) transient suppressor clamps
the input voltage at approximately 47 V, protecting the DC/DC
converter from line induced transients.
The filters are rated to operate, with no degradation of perfor-
mance, over the temperature range of –55°C to +85°C (as
measured at the baseplate). Above 85°C, input voltage and
current must be derated as specified in “Derating” on the
following page. The maximum power dissipation of the filters at
maximum input current represents a power loss of less than 3%
at typical input voltage.
MIL-STD N
oISe
M
aNageMeNT
When used in conjunction with Interpoint’s DC/DC converters
(see connection diagram, Figure 2), the input ripple current will
be reduced by 40 dB within the frequency band of 100 kHz to 50
MHz. This gives the filter/converter combination a performance
which exceeds the CE03 test limit of MIL-STD-461C. The CE03
performance of a model MHE2805S converter with and without
the FM-461 filter is shown in Figures 6 and 7.
L
ayouT
r
equIreMeNTS
The case of the filter must be connected to the case of the
converter through a low impedance connection to minimize EMI.
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • power@crane-eg.com
www.interpoint.com
Page 1 of 9
FM/A/B Rev C 20100212
eMI I
NpuT
F
ILTerS
absolute maximum ratings
input Voltage
• 0 to 40 VDC continuous
Lead soldering temperature (10 sec per lead)
• 300°C
storage temperature range (case)
• –55°C to +135°C
FM-461, FMA-461
AND FMB-461
1.75 To 5 AMP
derating
isolation
• 100 megohm minimum at 500 V
• Any pin to case (except case pin)
input Voltage range
• 0 to 40 VDC continuous
input ripple current
Derate linearly from 100% at 85°C case to
the following at 125°C case
270 mA rms FM-461
400 mA rms FMA-461
480 mA rms FMB-461
Dc input and output current
Derate linearly from 100% at 85°C case to
the following at 125°C case
750 mA FM-461
1.7 A FMA-461
1.7 A FMB-461
input Voltage
Derate linearly from 100% at 85°C case to
the 33 VDC at 125°C case
recommended operating conditions
case operating temperature (tc)
• –55°C to +85°C full power
• –55°C to +125°C absolute
Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified.
FM-461
28
FMA-461
28
FMB-461
28
paraMeTer
INpuT VoLTage
INpuT CLaMpINg VoLTage
CoNDITIoNS
CoNTINuouS
MIN Typ MaX
0
38.9 43.2 47.5
42.3 47.0 51.7
44.9 49.9 54.8
—
—
—
—
—
—
40
0.38
1.75
MIN Typ MaX MIN Typ MaX
40
0
40
38.9 43.2 47.5 38.9 43.2 47.5
42.3 47.0 51.7 42.3 47.0 51.7
44.9 49.9 54.8 44.9 49.9 54.8
—
—
—
40
3.8
1.0
—
—
—
—
—
—
40
5.0
1.2
—
uNITS
VDC
VDC
A
A rms
dB
Ω
pF
VDC
A
W
40 0
-55°C
+25°C
+125°C
INpuT CurreNT
DC
rIppLe
0.67 —
— —
NoISe rejeCTIoN
DC reSISTaNCe
(
r
DC
)
CapaCITaNCe
ouTpuT VoLTage1
ouTpuT CurreNT
power DISSIpaTIoN
15 kHz
To
50
MHz
STeaDy STaTe
aNy pIN To CaSe
STeaDy STaTe
STeaDy STaTe
MaX CurreNT
0.42 0.07 0.10 0.15 0.07 0.09 0.10
6450 — 8000
—
—
5.0
2.5
V
oUT
= V
IN
- I
IN
(R
DC
)
1.75 —
—
3.8 —
1.3
—
—
1.6
—
1900 — 2200 3700 — 4400
—
—
—
—
Note
1. Typical applications result in Vout within 2% of Vin.
469
H
1000 pF
x2
0.1
F
0.01F
0.001F
2.4
H
Positive
Input
Positive
Output
50
Input
Common
150
47 pF
Output
Common
4.7
F
FM-461
1000 pF
500 V
F
Igure
1: S
CheMaTIC
www.interpoint.com
Page 2 of 9
FM/A/B Rev C 20100212
eMI I
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F
ILTerS
FM-461, FMA-461
AND FMB-461
1.75 To 5 AMP
Positive
Input
1000 pF
>150
H
2.4
H
x2
x2
x3
0.1
F
0.01
F
0.001
F
Positive
Output
50
Input
Common
150
47 pF
x2
4.7
F
Output
Common
1000 pF
500 V
FMA-461
F
Igure
2: S
CheMaTIC
Positive
Input
P6KE47
0.65
3.5
H
3.5
H
Positive
Output
50
4.7
F
9.4
F
18.8
F
Input
Common
Output
Common
47 pF
500V
FMB-461
3300 pF
500 V
F
Igure
3: S
CheMaTIC
EMI FILTER
+Vin
+Vout
Case
Output
Input
Common Common
DC/DC CONVERTER
+Vin
+Vout
RL
Case
Output
Input
Common Common
Chassis
ground
Multiple units
allowed up to
rated output
current of filter
RL
The case ground connection should be as low an impedance as possible to minimize EMI.
Direct contact of baseplate to chassis ground provides the lowest impedance.
F
Igure
4: C
oNNeCTIoN
D
IagraM
www.interpoint.com
Page 3 of 9
FM/A/B Rev C 20100212
eMI I
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F
ILTerS
pin out
pin
1
2
3
4
5
designation
Positive Input
Positive output
Case Ground
Output Common
Input Common
Squared corner and dot on top
of package indicate pin one.
1
BOTTOM VIEW
FM-461, FMA-461, FMB-461
5
2
3
4
FM-461, FMA-461
AND FMB-461
1.75 To 5 AMP
Dotted line outlines flanged package option.
See cases H3, H5, K4, and K6, for dimensions.
F
Igure
5: p
IN
o
uT
model numbering key
Base Model
FM, FMA, or FMB
FMB - 461
F
/
ES
MIL-STD-461 reference
Case Option
(Non-flanged case has no designator in
this position)
Screening
(Standard screening has no designator
in this position)
Typical Performance Curves: 25°C Tc , nominal Vin, unless otherwise specified.
90
90
CE03 Limit
70
70
CE03 Limit
EMISSION LEVEL (dmA)
EMISSION LEVEL (dmA)
50
50
30
30
10
10
.015
.1
1
10
50
.015
.1
1
10
50
FREQUENCY (MHz)
FREQUENCY (MHz)
MHE Converter Without Filter
MHE Converter With FM-461 EMI Filter
F
Igure
6
www.interpoint.com
F
Igure
7
Page 4 of 9
FM/A/B Rev C 20100212
eMI I
NpuT
F
ILTerS
BOTTOM VIEW CASE H3
Squared corner and dot on top
of case indicate pin one.
FM-461, FMA-461
AND FMB-461
1.75 To 5 AMP
Solder Seal
1.120 (28.45)
0.960 (24.38)
1
2
0.040 dia
(1.02)
0.560 (14.22)
5
3
4
Solder Tip-off
0.160 (4.06)
0.000
0.000
0.25 +0.05/-0.00
(6.4 +1.3/-0.0)
0.000
0.255 (6.48)
1.855 (47.12)
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
Cold Rolled Steel/Nickel/Tin
Cover
Cold Rolled Steel/Nickel/Tin
Pins
#52 alloy, compression glass seal
Case H3, Rev C - 20100211
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 © 1999-2010 Interpoint Corp. All rights reserved.
0.417 max (10.59)
F
Igure
8: C
aSe
h3 - FM-461 N
oN
-F
LaNgeD
www.interpoint.com
Page 5 of 9
FM/A/B Rev C 20100212
2.110 (53.59)
