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FEATURES
* -55C to +85C operation * 0 to 40 VDC volt input * Up to 40 dB attenuation 110 kHz to 50 MHz * Transient suppression * Compliant to MIL-STD-461C, CE03
EMI INPUT FILTERS 28 VOLT INPUT
FM-461, FMA-461 AND FMB-461 EMI FILTERS 1.75 TO 5 AMP
MODELS
INPUT VOLTAGE AND CURRENT Input (V) 0 - 40 0 - 40 0 - 40 Current ( A) 1.75 3.8 5.0
Size (max.): Non-flanged case H3 or H5 2.125 x 1.125 x 0.495* inches (53.98 x 28.58 x 12.57* mm) Flanged case K4 or K6 2.910 x 1.125 x 0.495* inches (73.91 x 28.58 x 12.57* mm) See Section B8, cases H3, H5, K4, and K6, for dimensions. *Height varies depending on model. Weight: Maximum - FM-461 38 grams, FMA-461 42 grams, FMB-461 43 grams Screening: Standard or ES. See Section C2 for screening options, see Section A5 for ordering 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 highreliability applications. See Section B8, cases H3, H5, K4, and K6 for dimensions. See Section C2 for screening options.
FILTER OPERATION
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 performance, over the temperature range of -55C to +85C (as measured at the baseplate). Above 85C, 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 NOISE MANAGEMENT
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.
LAYOUT REQUIREMENTS
The case of the filter must be connected to the case of the converter through a low impedance connection to minimize EMI.
B5-3
FM-461 EMI FILTER 1.75 TO 5 AMP
ABSOLUTE MAXIMUM RATINGS
Input Voltage * 0 to 40 VDC continuous Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -55C to +135C Isolation * 100 megohm minimum at 500 V * Any pin to case (except case pin)
EMI INPUT FILTERS
DERATING
Input Voltage Derate linearly from 100% at 85C case to the 33 VDC at 125C case Input Ripple Current Derate linearly from 100% at 85C case to the following at 125C 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 85C case to the following at 125C case 750 mA FM-461 1.7 A FMA-461 1.7 A FMB-461
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range * 0 to 40 VDC continuous Case Operating Temperature (Tc) * -55C to +85C full power * -55C to +125C absolute
Electrical Characteristics: 25C Tc, nominal Vin, unless otherwise specified.
FM-461 PARAMETER INPUT VOLTAGE INPUT CLAMPING VOLTAGE INPUT CURRENT NOISE REJECTION DC RESISTANCE (RDC) CAPACITANCE OUTPUT VOLTAGE 1 OUTPUT CURRENT POWER DISSIPATION 15 kHz - 50 MHz STEADY STATE ANY PIN TO CASE STEADY STATE STEADY STATE MAX. CURRENT -- -- -- -- 1.75 1.3 -- -- 1900 40 0.38 -- -- 0.42 2200 -- 0.07 3700 40 0.10 -- -- 0.15 4400 -- 0.07 6450 40 0.09 -- -- 0.10 8000 dB pF VDC -- -- -- -- 5.0 2.5 A W CONDITION CONTINUOUS -55C +25C +125C DC RIPPLE MIN 0 38.9 42.3 44.9 -- -- TYP 28 43.2 47.0 49.9 -- -- MAX 40 47.5 51.7 54.8 1.75 0.67 MIN 0 38.9 42.3 44.9 -- -- FMA-461 TYP 28 43.2 47.0 49.9 -- -- MAX 40 47.5 51.7 54.8 3.8 1.0 MIN 0 38.9 42.3 44.9 -- -- FMB-461 TYP 28 43.2 47.0 49.9 -- -- MAX 40 47.5 51.7 54.8 5.0 1.2 A A rms VDC UNITS VDC
VOUT = VIN - IIN(RDC) -- -- -- -- 3.8 1.6
Note 1. Typical applications result in Vout within 2% of Vin.
469 H Positive Input 1000 pF
2.4 H Positive Output
x2
0.1 F
0.01 F
0.001 F
50 Input Common 150 47 pF Output Common
4.7 F
FM-461
1000 pF 500 V
FIGURE 1: SCHEMATIC
B5-4
EMI INPUT FILTERS
>150 H Positive Input 1000 pF x2 x3 0.1 F 0.01 F 2.4 H
FM-461 EMI FILTER 1.75 TO 5 AMP
x2 0.001 F Positive Output
50 Input Common 150 47 pF
x2 4.7 F Output Common
FMA-461
1000 pF 500 V
FIGURE 2: SCHEMATIC
P6KE47 Positive Input
0.65
3.5 H
3.5 H Positive Output
50
4.7 F
9.4 F
18.8 F
Input Common 47 pF 500V
Output Common
FMB-461
3300 pF 500 V
FIGURE 3: SCHEMATIC
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.
FIGURE 4: CONNECTION DIAGRAM
B5-5
FM-461 EMI FILTER 1.75 YO 5 AMP
EMI INPUT FILTERS
PIN OUT Squared corner and dot on top of package indicate pin one.
1 Pin 1 2 3 4 5 Designation Positive Input Positive Output Case Ground Output Common Input Common BOTTOM VIEW FM-461, FMA-461, FMB-461 5
2 3
4
Dotted line outlines flanged package option.
See Section B8, cases H3, H5, K4, and K6, for dimensions.
FIGURE 5: PIN OUT
MODEL NUMBERING KEY
FMB - 461 Base Model FM, FMA, or FMB MIL-STD-461 reference Case Option (Non-flanged case has no designator in this position) Screening (Standard screening has no designator in this position) F / ES
Typical Performance Curves: 25C Tc , nominal Vin, unless otherwise specified.
90 90
CE03 Limit
70 70
CE03 Limit
EMISSION LEVEL (dmA)
50
EMISSION LEVEL (dmA)
.1 1 10 50
50
30
30
10
10
.015
.015
.1
1
10
50
FREQUENCY (MHz)
FREQUENCY (MHz)
MHE Converter Without Filter FIGURE 6
MHE Converter With FM-461 EMI Filter FIGURE 7
B5-6
26221-001-DTS Rev A DQ# 14006 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. Copyright (c) 1990 - 1999 Interpoint. All rights reserved.
CASES
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 300C for 10 seconds per pin.
FIGURE 28: CASE H MAXIMUM DIMENSIONS
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.
FIGURE 29: CASE 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
CASES
BOTTOM VIEW CASE H3 FM-461 EMI Filter: Screening - Standard of ES
Solder Seal
1.120 (28.45) 0.960 (24.38) 0.040 dia (1.02) 0.560 (14.22) 1 2 3
CASE H
Squared corner and dot on top of case indicate pin one.
Solder Tip-off
5 0.160 (4.06) 0.000 0.417 max (10.59) 0.25 +0.05/-0.00 (6.4 +1.3/-0.0) 0.000 0.000 0.255 (6.48) 1.855 (47.12) 2.110 (53.59) 4
FIGURE 31: CASE H3
B8-19
CASES
BOTTOM VIEW CASE H5 FMA-461and FMB-461 EMI Filter: Screening - Standard of ES
Solder Seal
1.120 (28.45) 0.960 (24.38) 0.040 dia (1.02) 0.560 (14.22) 1 2
CASE H
Squared corner and dot on top of case indicate pin one.
3
Solder Tip-off
5 0.160 (4.06) 0.000 0.25 +0.05/-0.00 (6.4 +1.3/-0.0) 1.855 (47.12) 2 3 4 5 9 8 7 6 0.655 (16.64) 1.055 (26.80) 1.455 (36.96) 0.495 max (12.57) 2.110 (53.59) 2.110 (53.59) 0.000 0.000 0.255 (6.48) 4
FIGURE 33: CASE H5
BOTTOM VIEW CASE H6 MHE Series: Screening - Standard or ES HR151 Series and HR152 Series: no screening options
Solder Seal
1.120 (28.45) 0.960 (24.38) 0.040 dia (1.02) 1
Dot on top of case indicates pin one
Solder Tip-off
10 0.160 (4.06) 0.000 0.000 0.255 (6.48) 0.495 max (12.57) 0.25 +0.05/-0.00 (6.4 +1.3/-0.0) 1.855 (47.12) 0.000
FIGURE 34: CASE H6
B8-21
CASE K
CASES
Dot on top of case indicates pin one
CASE K BOTTOM VIEW See Figures 42 - 48 for pin configuration
1.125 max (28.58)
2.910 max (73.91)
Flange Thickness: Cases K1, K2, K3 and MLP Series (K5) 0.060 (1.52) Cases K4, K5 (except MLP Series), K6, K7, and K8 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) Materials Header Case K1 - K3 Cold Rolled Steel/Nickel/Gold Cases K4 - K8 Cold Rolled Steel/Nickel/Tin Cover Case K1 - K3 Kovar/Nickel Case K4 - K8 Cold Rolled Steel/Nickel/Tin Pins #52 alloy (all cases) Case K1, K2, and K3 (except MHV Series Single and Dual) ceramic seal Cases K4 - K8 and MHV Series Single and Dual (K3) 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
CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300C for 10 seconds per pin.
FIGURE 41: CASE K MAXIMUM DIMENSIONS
B8-26
CASES
BOTTOM VIEW CASE K4 Flanged case: Designator required in Case Option position of model number. FM-461 EMI Filter: Screening - Standard or ES
Solder Seal
1.115 (28.32) 0.955 (24.26) 0.040 dia (1.02) 0.555 (14.1) 1 2 3
CASE K
Squared corner and dot on top of case indicate pin one.
0.162 dia (4.11)
Solder Tip-off
5 0.155 (3.94) 0.000 0.230 (5.84) 0.417 max (10.59) 0.25 0.03 (6.4 0.8) 1.845 (46.86) 2.320 (58.93) 5 6 1.845 (46.86) 5 6 1.845 (46.86) 2.320 (58.93) 2.320 (58.93) 0.000 0.000 0.245 (6.22) 4
FIGURE 45: CASE K4
BOTTOM VIEW CASE K5 Flanged cases: Designator required in Case Option position of model number. MTR Series Dual and MLP Series: Screening - Standard or ES
Solder Seal
1.115 (28.32) 0.955 (24.26)
Squared corner and dot on top of case indicate pin one.
All K5 cases
Solder Tip-off
0.040 dia (1.02) 0.555 (14.1)
1
2
3 MTR Series Dual (Standard and ES)
4
10 0.155 (3.94) 0.000 - 0.230 (5.84) 0.000 0.245 (6.22)
9
8
7
0.645 (16.38)
1.045 (26.54)
0.417 max (10.59)
0.25 0.03 (6.4 0.8)
Squared corner and dot on top of case indicate pin one.
1.115 (28.32) 0.955 (24.26) 1 0.555 (14.1) 10 0.155 (3.94) 0.000 0.645 (16.38) 1.045 (26.54) 1.445 (36.70) 0.000 0.230 (5.84) 0.245 (6.22) 9 2 3 MLP Series 8 7 4
FIGURE 46: CASE K5
1.445 (36.70)
0.000
B8-29
CASE K
CASES
BOTTOM VIEW CASE K6 Flanged cases: Designator required in Case Option position of model number. FMA-461 and FMB-461 EMI Filters: Screening - Standard or ES
Solder Seal
1.115 (28.32) 0.955 (24.26) 0.040 dia (1.02) 0.555 (14.1) 1 2 3 0.162 dia (4.11)
Squared corner and dot on top of case indicate pin one.
Solder Tip-off
5 0.155 (3.94) 0.000 0.230 (5.84) 0.25 0.03 (6.4 0.8) 1.845 (46.86) 0.495 max (12.57) 2.090 (53.01) 5 6 1.845 (46.86) 2.320 (58.93) 2.320 (58.93) 0.000 0.000 0.245 (6.22) 4
FIGURE 47: CASE K6
BOTTOM VIEW CASE K7 Flanged case: Designator required in Case Option position of model number. MHE Series: Screening - Standard or ES
Solder Seal
1.115 (28.32) 0.955 (24.26) 0.040 dia (1.02) 0.555 (14.1) 1 2 3 4
Squared corner and dot on top of case indicate pin one.
Solder Tip-off
10 0.155 (3.94) 0.000 - 0.230 (5.84) 0.000 0.245 (6.22) 0.645 (16.38) 1.045 (26.54) 0.495 max (12.57) 0.25 0.03 (6.4 0.8) 1.445 (36.70) 0.000 9 8 7
FIGURE 48: CASE K7
B8-30
QA SCREENING 85C PRODUCTS
85C PRODUCTS
TEST (85C Products excluding HR products) PRE-CAP INSPECTION Method 2017 TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 500 g BURN-IN 96 hours at 70C ambient (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25C case HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) FINAL VISUAL INSPECTION Method 2009 yes yes no no yes yes yes no yes yes no yes no yes no yes yes yes STANDARD /ES
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Applies to the following products: MFW Series MTW Series MHE/MLP Series MHL Series MRH Series MTO Series MSR Series DCH Series FM/FMA/FMB EMI Filters MSF EMI Filter
C2-12

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