00003H02KXC - Interpoint Corporation

B1-15

SFCS28-461

EMI FILTER

5 AMP

EMI I

NPUT

ILTER

28 V

OLT

NPUT

MODEL

SFCS28-461 5 amp

FEATURES

• Fully qualified to Class H or K

• Passive components for

maximum tolerance in space

environments

• –55° to +125°C operation

• 28 volt input

• Up to 5 amps

throughput current

• Up to 55 dB attenuation

at 500 kHz

• Up to 60 dB attenuation

at 1 MHz and 5 MHz

• Compliant to

MIL-STD-461C, CE03

• Compatible with

MIL-STD-704E

DC power bus

DESCRIPTION

The SFCS-461™ Series EMI filter modules are specifically

designed to reduce the reflected input ripple current of high

frequency DC/DC converters. SFCS28-461 filters minimize electro-

magnetic interference (EMI) for Interpoint’s space application

converters. These filters are intended for use in 28 volt applications

which must meet MIL-STD-461 levels of conducted emissions. One

filter can be used with multiple converters up to the rated throughput

current of the filter.

SCREENING AND REPORTS

The SFCS28-461 filter offers three screening options – Standard,

Class H, or Class K. See Section C2, Quality Assurance, pages C2-

7 through C2-9, for descriptions. Detailed reports on product

performance are also available and are listed on page C2-9.

INPUT RIPPLE AND EMI

Switching DC/DC converters naturally generate two noise compo-

nents on the power input line: differential noise and common mode

noise. Input ripple current refers to both of these components.

Differential noise occurs between the positive input and input

common. Most Interpoint converters have an input filter that reduces

differential noise which is sufficient for most applications.

Common mode noise occurs across stray capacitances between

the converter ’s power train components and the baseplate (bottom

of the package) of the converter.

Where low noise currents are required to meet CE03 of MIL-STD-

461, a power line filter is needed. The SFCS28-461 Series of EMI

power line filters reduces the common mode and differential noise

generated by the converters. SFCS28-461 filters reduce input ripple

current by as much as 60 dB at 500 kHz and 55 dB at 1 MHz when

used in conjunction with Interpoint’s DC/DC converters.

The filter must be placed as close as possible to the converter for

optimum performance. The baseplates of the filter and the converter

should be connected with the shortest and widest possible conduc-

tors. For the best connection, mount the filter’s and converter’s

baseplates on or above a small ground plane.

OPERATION OVER TEMPERATURE

All SFCS28-461 Series filters are rated for full power operation from

–55°C to +125°C case temperature. Current is derated linearly to

zero at +135°C case temperature.

INSERTION LOSS

The maximum dc insertion loss at full load and nominal input voltage

represents a power loss of less than 4%.

PACKAGING

SFCS28-461filters are sealed in metal hermetic side-leaded pack-

ages.

For more information, contact your Interpoint representative

listed in Section A5.

Size (max.): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16mm)

See Section B8, case U1, for dimensions.

Weight: 110 grams maximum

Screening: Standard, Class H, or Class K (MIL-PRF-38534)

See Section C2 for screening options, see Section A5

for ordering information.

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. SFCS28-461 is a trademark of Interpoint.

B8-36

CASE CASE U C

ASES

Materials

Header Cold Rolled Steel/Nickel/Gold

Cover Kovar/Nickel

Pins #52 alloy/Gold

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 300°C for 10 seconds

per pin.

CASE U

TOP VIEW

(PIN SIDE)

See Figures 55 and 56 for dimensions

1.505 max (38.23)

3.005 (76.33) max.

Note: Pins are shown for Case U1.

Angled corner indicates pin one

FIGURE 54: CASE U MAXIMUM DIMENSIONS

B8-37

CASE U

ASES

Angled corner

indicates pin one.

0.000

0.050 (1.27)

0.000

0.120 (3.05)

0.250 (6.35)

0.450 (11.43)

0.650 (16.51)

0.850 (21.59)

1.050 (26.67)

1.250 (31.75)

1.380 (35.05)

1.505 (38.23) max.

0.000

0.120 (3.05)

0.250 (6.35)

2.750 (69.85)

2.880 (73.15)

3.005 (76.33) max.

0.128 dia

(3.25).

0.040 dia

(1.02)

0.23 (5.8) Lead Length

0.400 (10.16) max.

0.220 (5.59

TOP VIEW CASE U1

MFL Series and MHP Series: Screening – Standard, ES or 883

MFLHP Series, FMD270 EMI Filter, and FMD28-461SL EMI Filters:

Screening – Standard or ES

SMFL, SMFLHP, SMHP, and SSP Series; SFCS, and SFME EMI Filters:

Screening – Standard, Class H or K

HUM70 Module and LCM Module: Screening – Standard or ES

Seam Seal

FIGURE 55: CASE U1

C2-7

QA SCREENING

SPACE PRODUCTS

PACE

RODUCTS

ELEMENT EVALUATION STANDARD CLASS CLASS

TEST PERFORMED (O) H K

(COMPONENT LEVEL) M/S P M/S P M/S P

Element Electrical yes no yes yes yes yes

Element Visual no no yes yes yes yes

Internal Visual no no yes no yes no

Temperature Cycling no no no no yes yes

Constant Acceleration no no no no yes yes

Interim Electrical no no no no yes no

Burn-in no no no no yes no

Post Burn-in Electrical no no no no yes no

Steady State Life no no no no yes no

Voltage Conditioning /Aging no no no no no yes

Visual Inspection no no no no no yes

Final Electrical no no yes yes yes yes

Wire Bond Evaluation*no no yes yes yes yes

SEM no no no no yes no

SLAM™/C-SAM:

Input capacitors only no no no yes no yes

(Add’l test, not req. by H or K)

Definitions

Element Evaluation: Component testing/screening per MIL-STD-883 as determined by MIL-PRF-38534

SEM: Scanning Electron Microscopy

SLAM™: Scanning Laser Acoustic Microscopy

C-SAM: C - Mode Scanning Acoustic Microscopy

Notes

M/S Active components (Microcircuit and Semiconductor Die)

P Passive components

* Not applicable to EMI filters that have no wirebonds

SMFLHP Series

SMFL Series

SMHP Series (O&H only)

SMTR Series

SSP Series

SMHF Series

SMSA Series

SLH Series

SLIM Module

SFME120 EMI Filter

SFME28 EMI Filter

SFCS EMI Filter

SFMC EMI Filter

STF EMI Filter

Applies to the following products:

C2-8

QA SCREENING

SPACE PRODUCTS

ENVIRONMENTAL SCREENING

TEST PERFORMED STANDARD CLASS CLASS

(END ITEM LEVEL) (O) H K

Non-destruct bond pull*

Method 2023 no no yes

Pre-cap inspection

Method 2017, 2032 yes yes yes

Temperature cycle

Method 1010, Cond. C yes yes yes

Constant acceleration

Method 2001, 3000 g yes yes yes

PIND Test

Method 2020, Cond. B no no yes

Radiography

Method 2012 no no yes

Pre burn-in test yes yes yes

Burn-in, Method 1015, 125°C

96 hours yes no no

160 hours no yes no

2 x 160 hour (includes mid BI test) no no yes

Final electrical test

MIL-PRF-38534, Group A yes yes yes

Hermeticity test

Fine Leak,

Method 1014, Cond. A yes yes yes

Gross Leak,

Method 1014, Cond. C yes yes yes

Final visual inspection

Method 2009 yes yes yes

Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.

Note

* Not applicable to EMI filters that have no wirebonds.

SMFLHP Series

SMFL Series

SMHP Series (O&H only)

SMTR Series

SSP Series

SMHF Series

SMSA Series

SLH Series

SLIM Module

SFME120 EMI Filter

SFME28 EMI Filter

SFCS EMI Filter

SFMC EMI Filter

STF EMI Filter

Applies to the following products: