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FEATURES
* -55C to +85C operation * 50 dB minimum attenuation at 500 kHz * Compliant to MIL-STD-461C, CE03 * Overvoltage protection
EMI INPUT FILTER 28 VOLT INPUT
MSF EMI FILTER 0.8 AMP
MODEL
MSF-461 0.8 amp
Size (max.): 1.075 x 1.075 x 0.370 (27.31 x 27.31 x 9.40 mm) See Section B8, cases C3, for dimensions. Weight: 15 grams typical, 16 grams maximum Screening: Standard or ES. See Section C2 for screening options, see Section A5 for ordering information.
DESCRIPTION
The MSF-461 EMI filter module has been specifically designed to reduce the input line reflected ripple current of Interpoint's MSR and DCH Series of DC/DC converters. They are intended for use in applications where switch-mode DC/DC converters, operating at a frequency of higher than 50 kHz, must meet MIL-STD-461C levels of conducted power line noise. MSF-461 EMI 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, case C3, for dimensions. See Section C2 for screening options. This gives the filter/converter combination a performance which exceeds the CE03 test limit of MIL-STD-461C. The CE03 performance of a model MSR2812D converter with and without the MSF461 filter is shown in Figures 4 and 5.
FILTER OPERATION
The MSF-461 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 0.62 watts (at maximum input current) represents a power loss of less than 10% 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 50 dB within the frequency band of 50 kHz to 50 MHz.
LAYOUT REQUIREMENTS
The case of the filter must be connected to the case of the converter through a low impedance connection to minimize EMI.
B5-7
MSF EMI FILTER 0.8 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 +125C
EMI INPUT FILTERS
DERATING
Input Voltage Derate linearly from 100% at 85C case to the 33 VDC at 125C case DC Input and Output Current Derate linearly from 100% at 85C case to 150 mA at 125C case.
TYPICAL CHARACTERISTICS
Capacitance * 6600 pF max, any pin to case 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) * -55C to +85C full power
Electrical Characteristics: 25C Tc, nominal Vin, unless otherwise specified.
PARAMETER INPUT VOLTAGE INPUT CLAMPING VOLTAGE INPUT CURRENT NOISE REJECTION DC RESISTANCE1 (RDC) OUTPUT VOLTAGE2 OUTPUT CURRENT INTERNAL POWER DISSIPATION CONDITIONS CONTINUOUS -55C 25C 85C MIN 0 38.9 42.3 44.9 -- 50 3.00 MSF-461 TYP 28 43.2 47.0 49.9 -- -- 3.20 VOUT = VIN - IIN (RDC) -- -- -- -- 420 0.62 MAX 40 47.5 51.7 54.8 420 -- 3.50 UNITS VDC VDC mA DC dB VDC mA W
TC = 25C STEADY STATE STEADY STATE, 28 Vin MAXIMUM CURRENT
Notes 1. DC resistance measured using four wire technique. 2. Typical applications result in Vout within 5% of Vin.
Positive Input
1000 pF 500 V x2
570 H Positive Output x2 x4 0.01 F 0.001 F
50
100 x2
Input Common
Output Common 4.7 F
MSF-461
1000 pF 500 V
FIGURE 1: SCHEMATIC
B5-8
EMI INPUT FILTERS
MSF-461 3, 4 +Vin +Vout 5, 6 7 8, 9 1, 2 Case Output 1, 2 Input Common Common MSR CONVERTER
MSF EMI FILTER 0.8 AMP
12, 13 +Vout +Vin + 4 Case RL Output 8, 9 17, 18 Input Common Common
FIGURE 2: CONNECTION DIAGRAM
PIN OUT
Dot on top of cover indicates pin one.
Pin 1, 21 3, 41 5, 61 7 8, 91 Designation Input Common Positive Input Positive Output Case Ground Output Common
12 34
BOTTOM VIEW MSF
98 7 65
Note 1. Make external connections to both pins. See Section B8, case C3, for dimensions.
FIGURE 3: PIN OUT
MODEL NUMBERING KEY
MSF Base Model MIL-STD-461 reference Screening (Standard screening has no designator in this position.) 461 / ES
B5-9
MSF EMI FILTER 0.8 AMP
EMI INPUT FILTERS
Typical Performance Curves: 25C Tc , nominal Vin, unless otherwise specified.
90
CE03 Limit
70
EMISSION LEVEL (dmA)
50
30
10
.015
.1
1
10
50
FREQUENCY (MHz)
Narrowband spectrum of an MSR2812D converter without an EMI filter. FIGURE 4
90
CE03 Limit
70
EMISSION LEVEL (dmA)
50
30
10
.015
.1
1
10
50
FREQUENCY (MHz)
Narrowband spectrum of an MSR2812D converter with an MSF-461 filter on the input line. FIGURE 5
B5-10
MSF Rev B 20060307 (output current correction). 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) 1994 - 2006 Interpoint. All rights reserved.
CASE C
Dot on top of case indicates pin one
CASES
BOTTOM VIEW CASE C1 MSA Series: Screening - Standard, ES, or 883 SMSA Series: Screening - Space Standard, H, or K
Seam Seal Projection Weld
0.932 (23.67) 0.025 (0.64) dia.
CASE C BOTTOM VIEW See Figures 9 - 11 for pin configurations.
Squared corner and dot on top of case indicate pin one.
1 2 3 4 5
1.075 max (27.31)
1.075 max (27.31) Materials Header Case C1 Cold Rolled Steel/Nickel/Gold Cases C2 and C3 Kovar/Nickel/Tin Cover Case C1 Cold Rolled Steel/Nickel Cases C2 and C3 Kovar/Nickel/Tin Pins Case C1 Copper/Nickel/Gold Cases C2 and C3 Kovar/Nickel/Gold, matched 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 300C for 10 seconds per pin.
0.205 0.010 (5.21 0.25) 0.270 max. (6.86) 0.000 0.205 0.010 (5.21 0.25) 0.270 max. (6.86) 0.000
0.132 (3.35) 0.000 0.000
8
7
6
0.132 (3.35)
0.332 (8.43)
0.532 (13.51)
0.732 (18.59)
FIGURE 9: CASE C1
BOTTOM VIEW CASE C2 MSR Series: Screening - Standard or ES HR40 Series: No screening options
0.018 0.002 dia. (0.46 0.05)
Dot on top of case indicates pin one
12 0.800 (20.32 9
18 17
0.932 (23.67) 10 34 65
0.205 0.010 (5.21 0.25)
0.370 max. (9.40) 0.350 (8.89)
Marker bead on pin 18
0.100 (2.54) Pins equally spaced 0.800 (20.32)
FIGURE 10: CASE C2
FIGURE 8: CASE C MAXIMUM DIMENSIONS
Seam Seal
BOTTOM VIEW CASE C3 MSF EMI Filter: Screening - Standard or ES
0.018 0.002 dia. (0.46 0.05)
0.000
Dot on top of case indicates pin one
12 0.800 (20.32
98 0.100 (2.54)
7
FIGURE 11: CASE C3
B8-8
0.800 0.600 (20.32) (15.24)
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.
0.205 0.010 (5.21 0.25)
0.205 0.010 (5.21 0.25)
0.370 max. (9.40) 0.350 (8.89)
0.365 max. (9.27)
0.000
0.000
0.300 (7.62)
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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