25SMT-4442-03 Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – supersoft smt emi gaskets and grounding pads

Gore-Shield®
supersoft smt emi gaskets
and grounding pads
Unique Surface-
Mountable Solution
Technical Summary
GORE-SHIELD® Supersoft SMT EMI Gaskets and Grounding Pads
are highly compressible and resilient electrically conductive pads
that are compatible with standard surface mount technology
(SMT) installation processes.
GORE-SHIELD® Supersoft SMT EMI Gaskets and Grounding Pads
are comprised of a conductive silver-coated hollow silicone
extrusion bonded to a solderable silver-plated metal support
layer. Parts are packaged in EIA 481 standard tape-and-reel
format for automated placement and reflow soldering using
standard SMT processes. Parts are soldered to the ground trace
on the PCB like any other SMT-compatible component.
By piecing a series of parts of identical or varying lengths on a
PCB ground trace, a simple and efficient EMI seal can be formed
between the PCB and corresponding shield housing. This enables
users to create a low cost, custom EMI gasket at the board level
without special tooling or custom installation equipment.
Individual parts can be used to create reliable discrete electrical
contact points on the printed circuit board for grounding
purposes.
Benefits
• Highly compressible and resilient
• Extremely cost effective
• Highly conductive at low pressures
• No curing required
• Repairable
• Survives multiple solder reflow operations
• Compatible with standard and lead-free solder reflow
Design Suggestions
• Replacements for die-cut, form-in-place or stamped metal
spring-finger gaskets
• RF and DC grounding pads
• Conductive walls for cavity-to-cavity shielding
• Board-to-board interconnects
• Use as primary shielding method or to supplement existing
shielding methods
• Flex circuit grounding
Applications
• Mobile phones, PDAs, PCMCIAs, WLAN, base-stations,
power amplifiers, laptop computers
• Anywhere high electrical conductivity is needed in a
compressible, resilient form
GORE-SHIELD^® Supersoft SMT EMI Gasket
Nominal Properties
Part# 25SMT-4442
Property
–01
–03
–04
Length (mm)
3.6
3.6
8.0
Width (mm)
1.7
2.5
Thickness (mm)
1.6
2.4
Recommended
Compression
1.2
1.9
Stop, RCS (mm)
Force Required
to Compress to
2.0
3.2
8.9
RCS (N)
DC Resistance at
RCS (Ohms)
0.018
0.030
0.009
Compression
Set {ambient}
(percent of
original height)
4%
1,000 hours @ 20C
Compression
Set {dry heat}
(percent of
original height)
5%
1,000 hours @ 85C
Compression
Set {moist heat}
(percent of
original height)
14%
1,000 hours @ 85C
and 85% RH
Covered by Patent No.: US 6,255,581 B1
US 7,129,421 B2
Corresponding Foreign Patents issued and pending