Datasheet

www.lairdtech.com
20
CUSTOM DESIGN SHIELDS AND CONTACTS
INTRODUCTION
The complexities of today's electronics pose several design challenges.
Resolving EMI needs to be balanced with space, weight and production
restraints. When designing a custom shielding solution, beginning in the
earliest stages of the application design allows effective elimination of EMI
while meeting all specifications.
Laird Technologies board level shielding experts work through all phases of
development. From design, rapid prototyping and pre-production through
production and automated packaging, Laird Technologies has the experience
to help speed a product to market and stay within budget.
To increase manufacturing throughout and reduce costs, Laird Technologies
has developed a proprietary in-line production process that includes part for-
mation, wash, assembly, inspection and automated packaging.
By integrating quality processes, board level shield quality and performance
is ensured from design stage through final packaging. One process is the
automated co-planarity inspection system. Laird Technologies replicates
the
customer application by measuring shields in the same plane as the printed
circuit board. This is accomplished without "securing" or "touching" shields,
which could throw off measurement and/or deform parts. Laird Technologies
measures shields immediately prior to placement into carrier tape at speeds
that match automation packing.
Shield base materials include our exclusive Shield-Lite
TM
, CRS 1008/1010,
beryllium copper alloys, nickel-silver alloys, copper-based alloys and spring
steels. All shields are fully solderable.
ONE-PIECE SHIELD DESIGN
Low Cost/Excellent Effectiveness
Custom surface mount shields are available in both one-piece and two-
piece designs. One-piece shields provide six sides of protection, with the
sixth side being the board itself. One-piece designs offer economical
shielding alternatives where access to covered components for repair is not
necessary.
TWO-PIECE SHIELD DESIGN
Quick, Easy Repair and Inspection of Covered Components
Two-piece board level shields offer users the flexibility to inspect or repair
shielded components without having to
risk board damage by removing
the entire shield. Covers snap on and off with ease, making repairs quicker
and easier, and reducing board re-work. Two-piece shields are available
pre-assembled or unassembled. Large locking dimples snap into slots on
covers to provide mechanical retention force. Smaller grounding
dimples
provide electrical grounding for proper shielding and to prevent rattle.
Two-piece shields survive drop, shock and no-rattle tests. Here are critical
test results:
• Able to withstand acceleration of 4g from 10 Hz to 2000 Hz for three
hours in each of three planes as per SAE J1455
• Pass EN 50 155 for railway electrical equipment including vibration test
of 30g from 5 Hz to 200 Hz
in 3 directions and a shock test with 500 m/s
for 11/ms
• Pass standard telecommunications drop tests [6 faces, dropped 1 meter
onto concrete floor]
*Other materials may be available, please consult sales.
SURFACE MOUNT SHIELDS MATERIAL VARIATIONS
RAW MATERIAL*
THICKNESS
in (mm)
HEAT TREATMENT PLATING COMMENTS
CRS base box steel
1008/1010
0.005 to 0.090
(0,127 to 2,286)
No heat treatment Tin Pre-plated
Beryllium-copper
alloys
0.004 to 0.008
(0,102 to 0,203)
Heat treatable in
all temperatures
Tin, palladium,
nickel, gold
Pre-tempered &
pre-plated
Nickel-silver alloys
0.004 to 0.016
(0,102 to 0,406)
Stress annealed
Fully solderable
(if used with LT
proprietary process)
No plating required
for SMT
solderability
Copper-based
alloys
0.004 to 0.012
(0,102 to 0,305)
No heat treatment
Tin, palladium,
nickel, gold
Pre-tempered &
pre-plated
Spring steel
0.006 to 0.060
(0,152 to 1,524)
Austemper
Tin, nickel, black
oxide
Spring properties
determined by
application
Phosphor Bronze
alloys
0.004 to 0.020
(0,100 to 0,510)
N/A
Tin, palladium,
nickel, gold
Pre-tempered &
Preplated
Material properties are for reference only. Product testing by purchaser is recommended to confirm. Laird Technologies assumes
no liability for product failure unless specifically stated in writing.