Datasheet

6
www.lairdtech.com
7
www.lairdtech.com
EMI ESSENTIALSEMI ESSENTIALS
BLS Design
Type / Features
Key Attributes &
Application Consideration
BOARD LEVEL SHIELDS
PRODUCT SELECTION GUIDE
Corner Feature Unique Product
Features
Mounting Features Size & Shape
Traditional
Folded
Rigid
Corner
Full Drawn
w/ Flange
Full Drawn
Zero Flange
ReMovl Pick &
Place Bridge
SMT
Castellations
Thru Hole
Loc Pins
Pins, Tabs,
Etc.
Interior
Walls
Typical
Material
Thickness
Low Height
(less than 2
mm)
Typical
Length
& Width
Flatness
(Size Dep)
Improves Flatness
by increasing
torsional rigidity
Most mechanically rigid,
but depth attainable is
material and conguration
dependent
Similar to Full
Drawn, Tooling
more complex.
Easy removal of pick
and place bridge for
post reow inspection
Through hole style
pin that engages
to underside of
PCB by mechanical
engagement.
Material Type Description / Specs Comments Cost Position Applications
CRS, Tin Plated
1010 / 1008 CRS High Permeability Material for low Freq Applications, Very Good Solderability,
Mitigation options for Tin Whisker Growth, Pre-plated, Bare stamped edges
Best Most common BLS solutions
Nickel Silver CA770, CA752 Environmental Performance & Aesthetic Quality, Good Mechanical /
Strength Properties, Good Solderability, Active Flux may be required
Good Hi Performance BLS solutions
(Mechanical & Environmental)
Stainless Steel Typical 301 and 316 Series Environmental Performance, Good option for the cover of 2 piece designs Better BLS Covers, Specialty Military
Copper Alloys Phosphor Bronze, Beryllium Copper, Brass Can be chosen for unique requirements that integrate spring contacts,
Typically Plated for Solderability and/or corrosion resistance
Good Specialty BLS applications
Integrated Spring Contacts
97-2000
Large BLS Applications. Can
accommodate internal walls for
EMI compartmentation.
Frame N/A N/A N/A N/A N/A Std Opt Opt Opt 0.4 No 50-300 mm 0.2
Cover Std N/A N/A N/A N/A N/A N/A N/A 0.25 0.25 No 50-300 mm 0.2
EZ Peel
Support for legacy products.
ReCovr can often be a more reliable
alternative. EZ Peel can utilize a
separate replacement cover if desired.
Std N/A Opt N/A Std N/A Opt No 0.12 Yes 10-30 mm 0.1
ReCovr
Lower total cost 2 piece solution.
Eaveless side wall for maximum
component access.
N/A Req'd N/A N/A N/A Std N/A Opt No 0.3 No 10-40 mm 0.1
Single Piece
Simple low cost BLS Solution Opt Std Opt (height/matl limits) Opt N/A Std Opt Opt No 0.2 Yes 10- 75 mm 0.08
Traditional
Post Reow Component Access for
inspect, test, cleaning, etc. Various
cover retention features available
to address rattling, EMI, and shock/
vibration concerns.
Optional pre-assembled deliverable
Frame Opt Std Opt (height/matl limits) Low Height
Option
Opt Std Opt Opt Opt 0.2 Yes 10- 75 mm 0.08
Cover Std Opt Opt (height/matl limits) N/A N/A N/A N/A N/A N/A 0.15 Yes 10- 75 mm 0.15
TWO PIECE
BLS MATERIALS
MATRIX
SINGLE PIECE