Page 1 of 9
FM/A/B Rev C 20100212
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • power@crane-eg.com
www.interpoint.com
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.
MIL-STD No I S e Ma N a g e M e N T
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.
FI L T e r op e r a T I o N
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.
La y o u T re q u I r e M e N T S
The case of the filter must be connected to the case of the
converter through a low impedance connection to minimize EMI.
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.
MODELS
IN p u T Vo L T a g e
a N D Cu r r e N T
IN p u T (V)
0 - 40
0 - 40
0 - 40
Cu r r e N T (a)
1.75
3.8
5.0
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
28 Vo L T IN p u T
NOT RECOMMENDED FOR NEW DESIGNS
FEATURES
Attenuation 40 dB from 110 kHz to 50 MHz
Operating temperature -55° to +85°C•
Nominal 28 V input, 0 V to 40 V operation•
1.75 to 5 A throughput current•
Transient suppression•
Compliant to MIL-STD-461C CE-03•
DERATINGABSOLUTE 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
Isolation
• 100 megohm minimum at 500 V
• Any pin to case (except case pin)
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 0 to 40 VDC continuous
Case Operating Temperature (Tc)
• –55°C to +85°C full power
• –55°C to +125°C absolute
Input Voltage
Derate linearly from 100% at 85°C case to
the 33 VDC at 125°C case
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
x2 0.1 F 0.01F 0.001F
4.7 F
150
47 pF
1000 pF
50
1000 pF
500 V
Positive
Input
Input
Common
Positive
Output
Output
Common
FM-461
469 H 2.4 H
FI g u r e 1: SC h e M a T I C
Electrical Characteristics: 25°C Tc, nominal Vin, unless otherwise specified.
Note
1. Typical applications result in Vout within 2% of Vin.
FM-461 FMA-461 FMB-461 uNITS
paraMeTer CoNDITIoNS MIN Typ MaX MIN Typ MaX MIN Typ MaX
I N p u T V o L T a g e C o N T I N u o u S 0 28 40 0 28 40 0 28 40 VDC
I N p u T C L a M p I N g V o L T a g e -55°C 38.9 43.2 47.5
42.3 47.0 51.7
44.9 49.9 54.8
38.9 43.2 47.5
42.3 47.0 51.7
44.9 49.9 54.8
38.9 43.2 47.5
42.3 47.0 51.7
44.9 49.9 54.8
VDC
+25°C
+125°C
I N p u T C u r r e N T DC — — 1.75
— — 0.67
— — 3.8
— — 1.0
— — 5.0
— — 1.2
A
A rms
r I p p L e
N o I S e r e j e C T I o N 15 kHz T o 50 MHz — 40 — — 40 — — 40 — dB
D C r e S I S T a N C e (rD C )S T e a D y S T a T e — 0.38 0.42 0.07 0.10 0.15 0.07 0.09 0.10 Ω
C a p a C I T a N C e a N y p I N To C a S e 1900 — 2200 3700 — 4400 6450 — 8000 pF
o u T p u T V o L T a g e 1S T e a D y S T a T e VOUT = VIN - IIN(RDC)VDC
o u T p u T C u r r e N T S T e a D y S T a T e — — 1.75 — — 3.8 — — 5.0 A
p o w e r D I S S I p a T I o N M a X C u r r e N T — — 1.3 — — 1.6 — — 2.5 W
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
Page 2 of 9
FM/A/B Rev C 20100212
www.interpoint.com
+Vin +Vout
Input
Common
Output
Common
Case R
L
R
L
EMI FILTER DC/DC CONVERTER
+Vin +Vout
Input
Common
Output
Common
Case
Chassis
ground
Multiple units
allowed up to
rated output
current of filter
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.
FI g u r e 4: Co N N e C T I o N DI a g r a M
x3
x2 0.1 F 0.01 F 0.001 F
x2
x2
4.7 F
150
47 pF
1000 pF
50
1000 pF
500 V
Positive
Input
Input
Common
Positive
Output
Output
Common
FMA-461
2.4 H
>150 H
FI g u r e 2: SC h e M a T I C
4.7 F
3300 pF
500 V
Positive
Input
Input
Common
Positive
Output
Output
Common
FMB-461
3.5 H
9.4 F
0.65 3.5 H
50
47 pF
500V
P6KE47
18.8 F
FI g u r e 3: SC h e M a T I C
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
Page 3 of 9
FM/A/B Rev C 20100212
www.interpoint.com
Typical Performance Curves: 25°C Tc , nominal Vin, unless otherwise specified.
90
70
50
30
.015 .1 11050
10
EMISSION LEVEL (dmA)
FREQUENCY (MHz)
CE03 Limit
FI g u r e 6
MHE Converter Without Filter
90
70
50
30
.015 .1 11050
10
EMISSION LEVEL (dmA)
FREQUENCY (MHz)
CE03 Limit
FI g u r e 7
MHE Converter With FM-461 EMI Filter
MODEL NUMBERING KEY
FMB - 461 F / ES
Base Model
MIL-STD-461 reference
Screening
FM, FMA, or FMB
(Standard screening has no designator
in this position)
Case Option
(Non-flanged case has no designator in
this position)
PIN OUT
1 2
3
4
5
Squared corner and dot on top
of package indicate pin one.
BOTTOM VIEW
FM-461, FMA-461, FMB-461
Dotted line outlines flanged package option.
See cases H3, H5, K4, and K6, for dimensions.
FI g u r e 5: pIN ou T
Pin Designation
1 Positive Input
2 Positive Output
3 Case Ground
4 Output Common
5 Input Common
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
Page 4 of 9
FM/A/B Rev C 20100212
www.interpoint.com
FI g u r e 8: Ca S e h3 - FM-461 No N -FL a N g e D
0.160 (4.06)
0.960 (24.38)
Solder Seal
Solder Tip-off
0.000
0.040 dia
(1.02)
0.000
0.000
0.25 +0.05/-0.00
(6.4 +1.3/-0.0)
0.560 (14.22)
0.255 (6.48)
1.855 (47.12)
2.110 (53.59)
1.120 (28.45)
1 2
45
BOTTOM VIEW CASE H3
Squared corner and dot on top
of case indicate pin one.
3
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)
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
Page 5 of 9
FM/A/B Rev C 20100212
www.interpoint.com
0.160 (4.06)
0.960 (24.38)
Solder Seal
Solder Tip-off
0.000
0.040 dia
(1.02)
0.000
0.000
0.25 +0.05/-0.00
(6.4 +1.3/-0.0)
0.560 (14.22)
0.255 (6.48)
1.855 (47.12)
2.110 (53.59)
1.120 (28.45)
1 2
45
BOTTOM VIEW CASE H5
0.495 max (12.57)
Squared corner and dot on top
of case indicate pin one.
3
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 H5, 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.
FI g u r e 9: Ca S e h5 - FMa/FMB-461 No N -FL a N g e D
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
Page 6 of 9
FM/A/B Rev C 20100212
www.interpoint.com
FI g u r e 10: Ca S e K4 - FM-461 FL a N g e D
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
Page 7 of 9
FM/A/B Rev C 20100212
www.interpoint.com
0.155 (3.94)
0.955 (24.26)
0.000
0.040 dia
(1.02)
0.000
0.000
0.25 ±0.03
(6.4 ±0.8)
0.555 (14.1)
0.245 (6.22)
1.845 (46.86)
1.115 (28.32)
1 2
45
*Flanged case: Designator “F” required in Case Option position of model number.
BOTTOM VIEW CASE K6
0.162 dia
(4.11)
0.230 (5.84)
2.320 (58.93)
Solder Seal
Solder Tip-off
Squared corner and dot on top
of case indicate pin one.
3
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.
Case K6, Rev E - 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.
Flange Thickness: 0.067 +0.005/-0.007 (1.70 +0.13/-0.8)
0.495 max (12.57)
2.910 max
(73.91)
FI g u r e 11: Ca S e K6 - FMa/FMB-461 FL a N g e D
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
Page 8 of 9
FM/A/B Rev C 20100212
www.interpoint.com
ST A N D A R D A N D /ES (N O N -QML) PR O D U C T S
EN V I R O N M E N T A L SC R E E N I N G 1
TEST PERFORMED STANDARD
NON-QML2
/ES
NON-QML2
Pre-cap Inspection
Method 2017, 2032 yes yes
Temperature Cycle (10 times)
Method 1010, Cond. B, -55°C to +125°C, ambient no yes
Constant Acceleration
Method 2001, 500 g no yes
Burn-in
Method 1015 3
96 hours no yes
Final Electrical Test MIL-PRF-38534, Group A
Subgroups 1 and 4: +25°C case yes yes
Hermeticity Test
Fine Leak, Method 1014, Cond. A
Gross Leak, Method 1014, Cond. C
Gross Leak, Dip (1 x 10-3)
no
no
yes
yes
yes
no
Final visual inspection
Method 2009 yes yes
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Notes:
1. Refers to products that do not offer QML screening.
2. Standard and /ES, non-QML products, do not meet all of the requirements of MIL-PRF-38534.
3. Burn-in designed to bring the case temperature to the maximum case temperature of the product. Refer to the specific product information
for the maximum case temperature.
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Notes:
1. Refers to products that do not offer QML screening.
2. Standard and /ES, non-QML products, do not meet all of the requirements of MIL-PRF-38534.
3. Burn-in designed to bring the case temperature to the maximum case temperature of 85°C.
FM-461, FMA-461
AND FMB-461
1.75 TO 5 AMP
eMI IN p u T FI L T e r S
Page 9 of 9
FM/FMA/FMB-461 EMI Filter, FM/A/B Rev C 20100212. This revision supersedes 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. FM/FMA/FMB-461 Series is a trademark of Interpoint. Copyright © 1999 - 2010 Interpoint Corporation. All rights reserved. www.interpoint.
com