B3-17
DESCRIPTION
Interpoint specifically designed the FMH-461TM EMI filter to reduce
the input line reflected ripple current of the following high frequency
DC/DC converters: MHD, MHF, MHF+, MHV, MSA
1
, and MTR
series converters. It will also reduce EMI for several of Interpoint's
lower frequency converters: MHE/MLP, MHL, MTO, and MTW
series. The FMH-461 filter is ideal for use in applications which must
meet MIL-STD-461C levels of conducted and radiated emissions.
Throughput current is 1.5 amps. At 16 VDC input (low line), the filter
provides 24 watts of throughput power.
MIL-STD N
OISE
M
ANAGEMENT
When used in conjunction with Interpoint converters, the FMH-461
EMI filter reduces input ripple current by 35 dB or greater at 200 kHz
and by at least 50 dB at 500 kHz (see Figures 5 and 6 and electrical
characteristics table). This attenuation gives the converter/filter
combination performance which exceeds MIL-STD-461C's CE03
test.
F
ILTER
O
PERATION
FMH-461 filters are rated for full power operation from 55C to
+125C baseplate temperature. Operation is offered up to the
absolute maximum of +135C with derating as defined in
"Recommended Operating Conditions" on the following page. The
maximum DC insertion loss at full load and nominal input voltage
(28 VDC) represents a power loss of less than 2%.
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.
1. MSA models may require an inductor in series with the MSA's positive input.
2 H is the suggested value.
EMI I
NPUT
F
ILTER
28 V
OLT
I
NPUT
FMH EMI FILTER
1.5 AMP
F
EATURES
55C to +125C operation
50 dB minimum attenuation
at 500 kHz
Compliant to MIL-STD-461C, CE03
Compatible with MIL-STD-704E
DC power bus
Size (max.): Non-flanged, case E3
1.460 x 1.130 x 0.330 (37.08 x 28.70 x 8.38 mm)
Flanged, case G3
2.005 x 1.130 x 0.330 inches (50.93 x 28.70 x 8.38 mm)
See Section B8, cases E3 and G3, for dimensions.
Weight:
22 grams typical, 28 grams maximum
Screening: Standard, ES, or 883 (Class H). See Section C2 for screening
options, see Section A5 for ordering information.
MODEL
FMH-461
1.5 amp
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
TYPICAL CHARACTERISTICS
Input Voltage
0 to 40 VDC continuous
Lead Soldering Temperature (10 sec per lead)
300C
Storage Temperature Range (Case)
65C to +150C
B3-18
FMH EMI FILTER
1.5 AMP
Input Voltage Range
16 to 40 VDC continuous
Case Operating Temperature (Tc)
55C to +125C full power
Derating DC Input/Output current
Derate linearly from 100% at 125C to 0% at
135C case
Electrical Characteristics: 25C Tc, nominal Vin, unless otherwise specified.
EMI I
NPUT
F
ILTERS
Capacitance
0.024 F max, any pin to case
Isolation
100 megohm minimum at 500 V
Any pin to case, except case pin
FMH-461
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
INPUT VOLTAGE
CONTINUOUS
0
28
40
VDC
INPUT CURRENT
--
--
1.5
A
NOISE REJECTION
200 kHz
35
40
--
dB
500 kHz
50
60
--
DC RESISTANCE (R
DC
)
TC = 25C
--
0.20
0.35
OUTPUT VOLTAGE
1
STEADY STATE
V
OUT
= V
IN
- I
IN
(R
DC
)
VDC
OUTPUT CURRENT
RIPPLE
--
--
0.3
A rms
STEADY STATE
--
--
1.5
A
INTERNAL POWER
DISSIPATION
MAXIMUM CURRENT
--
0.5
0.8
W
Notes
1. Typical applications result in Vout within 2% of Vin.
2 F
6800 pF
500 V
Positive
Input
Input
Common
Positive
Output
Output
Common
FMH-461
590 H
30 H
3300 pF
500V
1 F
5.1
1 F
2 F
34
F
IGURE
1: S
CHEMATIC
PIN OUT
MODEL NUMBERING KEY
BOTTOM VIEW
FMH
NON-FLANGED
AND FLANGED
Dot on top of cover
indicates pin one.
Dotted line outlines flanged package option.
1
2
5
4
3
FMH - 461 F / 883
Base Model
MIL-STD-461 Reference
Screening
(Standard screening has no designator
in this position.)
Case Option
(Non-flanged case has no designator in
this position)
B3-19
EMI I
NPUT
F
ILTERS
See Section B8, cases E3 and G3 for dimensions.
Pin
Designation
1
Positive Input
2
Positive Output
3
Case Ground
4
Output Common
5
Input Common
F
IGURE
3: P
IN
O
UT
DSCC NUMBER
DSCC D
RAWING
(5915)
95003-01HXC
95003-01HZC
FMH
-461 F
ILTER
S
IMILAR
P
ART
FMH-461/883
FMH-461F/883
For exact specifications for a DSCC product, refer to the
DSCC drawing. See Section A3, "SMD/DSCC Lists", for
more information.
FMH EMI FILTER
1.5 AMP
+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
F
IGURE
2: C
ONNECTION
D
IAGRAM
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.
B3-20
Typical Performance Curves: 25C Tc , nominal Vin, unless otherwise specified.
EMI I
NPUT
F
ILTERS
FMH EMI FILTER
1.5 AMP
FREQUENCY (MHz)
0.1
1
10
50
.015
EMISSION LEVEL (dB A)
90
80
70
60
50
40
30
20
10
0
CE03 LIMIT
F
IGURE
4
FREQUENCY (MHz)
0.1
1
10
50
.015
EMISSION LEVEL (dB A)
90
80
70
60
50
40
30
20
10
0
CE03 LIMIT
F
IGURE
5
F
IGURE
6
-10
0
10
20
dB OHMS = 20 LOG Z
OUT
FREQUENCY (Hz)
1 K
10 K
100 K
1 M
-20
MHF+2805S Converter Without Filter
MHF+2805S Converter With FMH-461 Filter
Typical Output Impedance (Z)
With Input Shorted
FMH-461
26421-001-DTS Rev A
DQ# 4044
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. FMH-461 is a trademark of Interpoint.
Copyright 1992 - 1999 Interpoint. All rights reserved.
B8-15
CASE G
C
ASES
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover
MHF+ Series and FMH Filter
Kovar/Nickel
SMHF
Cold Rolled Steel/Nickel
Pins
#52 alloy (all cases)
compression glass seal
Case dimensions in inches (mm)
Tolerance
0.005 (0.13) for three decimal places
0.01 (0.2) for two decimal places
unless otherwise specified
CASE G
BOTTOM VIEW
Flanged package
See Figures 25 - 27
for pin configuration
2.005 max
(50.93)
1.130 max
(28.70)
Squared corner and dot on top
of case indicate pin one.
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.
Flange Thickness: 0.047 (1.19)
1.590 (40.39)
0.128 dia
(3.25)
0.030 dia.
(0.76)
Flanged cases: Designator "F" required in Case Option position of model number
MHF+ Series Single and Dual, LIM5050 Module: Screening Standard, ES, or 883
SMHF Series, SLIM5050 Module: Screening Space Standard, H, or K
BOTTOM VIEW CASE G1
0.000
0.205 (5.21)
0.505 (12.83)
0.705 (17.91)
0.905 (22.99)
1.105 (28.07)
0.000
0.160
(4.06)
0.960
(24.38)
1
2
3
4
5
8
7
6
0.140 (3.56)
0.560
(14.22)
0.330 max.
(8.38)
0.000
0.25 (6.35)
0.330 max.
(8.38)
0.000
0.25 (6.35)
Squared corner and dot on top
of case indicate pin one.
Projection Weld
Seam Seal
F
IGURE
25: C
ASE
G1
F
IGURE
24: C
ASE
G M
AXIMUM
D
IMENSIONS
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.
B8-16
CASE G
C
ASES
1.590 (40.39)
0.128 dia
(3.25)
0.030 dia.
(0.76)
Flanged case: Designator required in Case Option position of model number.
MHF+ Series Triple: Screening Standard, ES, or 883
BOTTOM VIEW CASE G2
0.000
0.205 (5.21)
0.505 (12.83)
0.705 (17.91)
0.905 (22.99)
1.105 (28.07)
0.000
0.160
(4.06)
0.960
(24.38)
1
2
3
4
5
9
8
6
7
0.140 (3.56)
0.560
(14.22)
0.330 max.
(8.38)
0.000
0.25 (6.35)
0.330 max.
(8.38)
0.000
0.25 (6.35)
Projection Weld
Seam Seal
Squared corner and dot on top
of case indicate pin one.
F
IGURE
26: C
ASE
G2
1.590 (40.39)
0.128 dia
(3.25)
0.030 dia.
(0.76)
Flanged case: Designator required in Case Option position of model number.
FMH EMI Filter: Screening Standard, ES, or 883
BOTTOM VIEW CASE G3
0.000
0.205 (5.21)
1.205 (30.61)
0.000
0.160
(4.06)
0.960
(24.38)
1
2
5
4
0.140 (3.56)
0.560
(14.22)
3
0.330 max.
(8.38)
0.000
0.25 (6.35)
0.330 max.
(8.38)
0.000
0.25 (6.35)
Projection Weld
Seam Seal
Squared corner and dot on top
of case indicate pin one.
F
IGURE
27: C
ASE
G3
B8-10
CASE E
C
ASES
CASE E
BOTTOM VIEW
See Figures 16 18
for pin configurations.
Squared corner and dot on top
of case indicate pin one.
1.460 max
(37.08)
1.130 max
(28.70)
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
(SMHF Series
Cold Rolled Steel/Nickel/Gold)
Pins #52
alloy/Gold
compression glass seal
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.
0.000
0.205
(5.21)
0.505
(12.83)
0.705
(17.91)
0.905
(22.99)
1.105
(28.07)
0.330 max
(8.38)
0.000
0.25 (6.35)
0.000
0.160
(4.06)
0.960
(24.38)
1
2
3
4
5
0.030 dia.
(0.76)
8
7
6
MHF+ Series Single and Dual: Screening Standard, ES, or 883
MHF Series and LIM5050 Module: Screening Standard or ES
SMHF Series Single and Dual and SLIM5050 Module:
Screening Space Standard, H, or K
HR120 Series: No screening options
BOTTOM VIEW CASE E1
0.330 max
(8.38)
0.000
0.25 (6.35)
Projection Weld
Seam Seal
Squared corner and dot on top
of case indicate pin one.
F
IGURE
16: C
ASE
E1
F
IGURE
15: C
ASE
E M
AXIMUM
D
IMENSIONS
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.
B8-11
CASE E
C
ASES
0.000
0.205
(5.21)
0.505
(12.83)
0.705
(17.91)
0.905
(22.99)
1.105
(28.07)
0.000
0.160
(4.06)
0.960
(24.38)
0.030 dia.
(0.76)
MHF+ Series Triple: Screening Standard, ES, or 883
1
2
3
4
5
8
7
6
9
BOTTOM VIEW CASE E2
0.330 max
(8.38)
0.000
0.25 (6.35)
0.330 max
(8.38)
0.000
0.25 (6.35)
Projection Weld
Seam Seal
Squared corner and dot on top
of case indicate pin one.
0.000
0.205
(5.21)
1.205
(30.61)
0.000
0.160
(4.06)
0.960
(24.38)
0.030 dia.
(0.76)
FMH EMI Filter: Screening Standard, ES, or 883
1
2
4
5
0.560
(14.22)
3
BOTTOM VIEW CASE E3
0.330 max
(8.38)
0.000
0.25 (6.35)
0.330 max
(8.38)
0.000
0.25 (6.35)
Projection Weld
Seam Seal
Squared corner and dot on
case top indicate pin one.
F
IGURE
17: C
ASE
E2
F
IGURE
18: C
ASE
E3
C2-10
TEST (125C Products)
STANDARD
/ES
/883 (Class H)*
PRE-CAP INSPECTION
Method 2017, 2032
yes
yes
yes
TEMPERATURE CYCLE (10 times)
Method 1010, Cond. C, -65C to 150C
no
no
yes
Method 1010, Cond. B, -55C to 125C
no
yes
no
CONSTANT ACCELERATION
Method 2001, 3000 g
no
no
yes
Method 2001, 500 g
no
yes
no
BURN-IN
Method 1015, 160 hours at 125C
no
no
yes
96 hours at 125C case (typical)
no
yes
no
FINAL ELECTRICAL TEST MIL-PRF-38534, Group A
Subgroups 1 through 6: -55C, +25C, +125C
no
no
yes
Subgroups 1 and 4: +25C case
yes
yes
no
HERMETICITY TESTING
Fine Leak, Method 1014, Cond. A
no
yes
yes
Gross Leak, Method 1014, Cond. C
no
yes
yes
Gross Leak, Dip (1 x 10
-3
)
yes
no
no
FINAL VISUAL INSPECTION
Method 2009
yes
yes
yes
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
*883 products are built with element evaluated components and are 100% tested and guaranteed over
the full military temperature range of 55C to +125C.
MOR Series
MFLHP Series
MFL Series
MHP Series
MTR Series
MQO Series**
MHD Series
MHV Series
MHF+ Series
MHF Series**
MGA Series
MSA Series
MGH Series
MCH Series
FM-704A EMI Filter
FMD**/FME EMI Filter
FMC EMI Filter
FMH EMI Filter
FMGA EMI Filter
FMSA EMI Filter
HUM Modules**
LCM Modules**
LIM Modules
QA SCREENING
125C PRODUCTS
125C P
RODUCTS
Applies to the following products
**MFLHP Series, MQO Series, MHF Series, FMD EMI Filters, Hum Modules, and LCM Modules do not offer
`883" screening.
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