B1-16

STF28-461

EMI FILTER

0.8 AMP

DESCRIPTION

The STF28-461™ EMI filter module has been designed as a

companion for Interpoint SMSA flyback power converters. Multiple

SMSA power converters can be operated from a single filter

provided the total power line current does not exceed the filter

maximum rating. The STF filter will reduce the SMSA’s power line

reflected ripple current to within the limit of MIL-STD-461C, Method

CE03, as shown in the example of Figures 4 and 5.

The STF filter is fabricated using thick film hybrid technology and is

sealed in a metal package for space, military, aerospace and other

applications requiring EMI suppression.

The STF28-461 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.

The SMSA power converter has an internal capacitor across its

input power terminals. When the SMSA and STF filters are used

together, this capacitor becomes part of the filter and forms its final

LC output section.

The STF filter provides both differential and common mode rejection

bringing DC/DC converters into compliance with MIL-STD-461C

CE03. It is designed to be used with the SMSA, SMHF, and MCH

Series of converters. The STF filter can be used with multiple

converters up to the rated current of the filter.

For more information, contact your Interpoint representative

listed in Section A5.

• 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 0.8 amps throughput current

• 50 dB minimum attenuation

at 500 kHz

• Compliant to MIL-STD-461C, CE03

• Compatible with MIL-STD-704E

DC power bus

Size (max.): 0.975 x 0.800 x 0.270 (24.77 x 20.32 x 6.86 mm)

See Section B8, cases A1, for dimensions.

Weight:

10.3 grams typical, 11.5 grams maximum

Screening:

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

See Section C2 for screening options, see

Section A5 for ordering information.

MODEL

STF28-461

0.8 amp

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. STF28-461 is a trademark of Interpoint.

Copyright © 1999 Interpoint. All rights reserved.