The following are examples of some of the more commonly used constructions for Flex
and Rigid+Flex PCBS found in common applications.
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Flex circuit layer counts typically vary from 1-6 layers. Constructions can accommodate
plated through holes (PTH) and surface mount technology (SMT) components. Polyimide
or FR4 stiffeners are commonly added to meet application mechanical requirements.
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- Common Applications: Zero Insertion Force (ZIF) to ZIF interconnect systems.
- Allows access to one layer of copper from both sides of the design.
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- Common Applications: Connector to connector requirements.
- Flex core can be Adhesive based or not, depending upon finished thickness required
to meet bend requirements.
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- Common applications: Surface micro-strip controlled impedance, ZIF to ZIF interconnect,
PTH or SMT Connector interconnects,
- Flex core can be Adhesive based, or not depending upon finished thickness required
to meet bend requirements.
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- Common applications: Controlled impedance, radio frequency (RF)/electromagnetic
interference (EMI) shielding.
- Flex cores are typically with-out adhesive to minimize flex thickness and allow
for bend requirements.
- Higher layer counts available. Review of bend requirements recommended.
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A combination of rigid Printed Circuit Board technology and flex circuit technology allows for a very
wide variety of rigid and flex layer counts and combinations. Rigid areas can utilize
blind and buried vias, with some limitations, and via in pad technology. Rigid area
layer counts range from 2–20+ and flex area layer counts from 1–6+.
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- Common application(s): Simple designs with limited space and performance requirements.
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The above illustrates a small sample of available flex and rigid-flex PCB constructions.
When designing your flex circuit, refer to IPC specifications for specific flexible
materials, circuit design, performance, and assembly of flexible circuits.
(Source: epectec.com)