gore-shield supersoft smt emi gaskets and grounding pads ? technical summary gore-shield ? supersoft smt emi gaskets and grounding pads are highly compressible and resi lient 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 re? ow soldering using standard smt processes. parts ar e 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 ef? cient emi seal can be formed between the pcb and corresponding shield housing. this enables users to create a low cost, cust om 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 circ uit board for grounding purposes. bene? ts highly compressible and resilient extremely cost effective highly conductive at low pressures no curing required repairable survives multiple solder re? ow operations compatible with standard and lead-free solder re? ow design suggestions replacements for die-cut, form-in-place or stamped metal spring-? nger gaskets rf and dc grounding pads conductive walls for cav ity-to-cavity shielding board-to-boar d interconnects use as primary shielding method or to supplement existing shielding methods flex circuit grounding applications mobile phones, pdas, pcmcias, wlan, base-stations, power ampli? ers, 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 C01 C03 C04 length (mm) 3.6 3.6 8.0 width (mm) 1.7 2.5 thickness (mm) 1.6 2.4 recommended compression stop, rcs (mm) 1.2 1.9 force required to compress to rcs (n) 2.0 3.2 8.9 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 unique surface- mountable solution
gore-shield supersoft smt emi gaskets and grounding pads ? jk051220-03 rev. 8-21-07 w. l. gore & associates, inc. gore and designs are trademarks of w. l. gore & associates, inc. ?2006 w. l. gore & associates, inc. north america 1 (800) 445-gore (4673) europe +49 9144 6010 +44 1382 561511 international 1 (302) 292-5100 china: beijing +86 10 6510 2980 china: shanghai +86 21 6247 1999 china: shenzhen +86 755 8359 8262 gore.com/emi more international phone numbers can be found at gore.com/phone japan +81 3 3570 8712 korea +82 2 393-3411 taiwan +886 2 8771 7799 singapore +65 6 733 2882 compression/dc resistance performance 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 0.20 0.18 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 compressed height (mm) compression force (n) dc resistance (ohms) 25smt-4442-01 force (n) dc resistance (ohms) rcs 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 0.20 0.18 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 compressed height (mm) compression force (n) dc resistance (ohms) 25SMT-4442-03 force (n) dc resistance (ohms) rcs 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0.0 0.20 0.18 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 compressed height (mm) compression force (n) dc resistance (ohms) 25smt-4442-04 force (n) dc resistance (ohms) rcs rohs status rohs material* pass/fail lead (pb) cont ent pass cadmium (cd) cont ent pass hexavalent chr omium (cr6) c ontent pass mercury (hg) cont ent pass bromine compou nds pass *w. l. gore & associates declares that we do not intentionally add substances listed in directive 2002/95/eu to gore-shield ? supersoft smt emi gasket material. independent lab tests have been performed and r esults are available upon request.
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