Flex PCB and Rigid-Flex Circuits
Flex Circuits, usually known as Flex PCB, are changing the way that electronics
industry is creating new products, initially developed to replace wire harnesses,
the Flexible Circuit technology is now breaking the old fabrication paradigms where
the size of the PCB was a determining factor in electronics designing.
Through the years PCB Unlimited has built a network of manufacturing partners that
include the most Flex PCB savvy factories offshore and in the US. Offering a wide
range of high quality solutions, from single sided Flexible Circuits to Rigid-Flex
boards, at the best prices.
Flex PCB technology applications
At today's world Flex Circuits can be found almost anywhere from gadgets as laptops,
tablets, cell phones and smartwatches to airplanes and unmanned vehicles. The list
of applications for Flexible Circuits keeps growing and growing.
We provide Flex PCB solutions to companies from the following industries:
- Automobile industry
- Consumer electronics
- Medical instruments
Flex PCB Technology Benefits
There is a large list of benefits offered by the Flexible Circuit Technology,
it can considerably improve the physical characteristics of a design by reducing
both weight and size. The cost and performance advantages of using Flexible
Circuits are also points that engineers and designers keep in mind, since this
technology is able to offer the following benefits:
PERFORMANCE VS RIGID PCB
- Superior heat dissipation.
- Dynamic Flexing.
- Lower inductance (vs traditional wiring systems).
- Superior package density.
COST VS RIGID PCB
- Wiring harnesses substitution that lead to wiring errors elimination.
- Improved reliability.
- Assembly time and effort reductions that lead to drops in the final assembly costs.
Flex Circuits Stack-ups
SINGLE SIDED FLEX CIRCUITS
Consisting of a single thin conductive layer, hot-pressed and glued together
with a flexible dielectric film to provide electrical insulation and protection
from the elements, a single sided Flex PCB is the most basic and
most common type of Flex Circuits.
DOUBLE SIDED FLEX CIRCUITS
Starting with a Polyimide film as a base layer, two separate conductive layers
are then glued and hot-pressed together to both sides of the film. Plated
Through Holes (PTH) are used to interconnect the copper layers, and additional
layers of polyimide on both sides of the panel brings insulation to the double
sided Flex Circuits.
Containing three or more conductive layers, Multilayer Flex circuits
manufacturing is performed combining double and single sided
Flexible constructions, using adhesive layers to bond
them together and interconnecting them by means of plated Vias. Circuit
protection and electrical insulation is provided by a Coverlay (usually Polyimide).
Rigid-Flex Circuits are obtained by laminating together flexible
and rigid substrates, providing the design not only with strength but with dynamic
adaptability as well. The rigid parts are often used to carry components and the
flex substrates serve as interconnection paths.
||0.5 mil (.0005"), 1 mil (.001"), 2 mils (.002"), 3 mils (.003"), 5 mils (.005")
||2 mils (.002")
||Polyimide: 0.5 mil (.0005") – 5 mils (.005") Copper: 0.5 oz. (.0007") – 2oz. (.0028")
||0.5 oz. (.0007"), 1 oz. (.0014"), 2 oz. (.0028")
||Acrylic/Modified Acrylic, Phenolic Butyral, Modified Epoxy
||Solder (hot air leveling or electrolytic plating), Electroless Au and Ni
||FR-4, polyimide, metal, or customer supplied
|Other Materials or Finishes
||Contact us at: firstname.lastname@example.org
|Max. Panel Size
||250mm * 450mm
|Minimum Trace Width/Spacing
||.003"/.003" (0.5 oz.)
.004"/.004" (1 oz.)
|Minimum Trace to Route Edge Dimension
|Minimum Route Dimensional Tolerance
|Minimum Tolerance of ZIF Connector to Edge of Flex
|Minimum Feature to Feature Dimensional Tolerance
|Minimum Corner Route Radius
|Minimum Inside Radius
|Minimum Hole size
|Minimum Slot Width
|Minimum Annular Ring Size
|Minimum Space Between Coverlay Openings
|Minimum Legend Line Width
|Edge of Coverlay Opening to Trace
|Minimum Inner Diameter or Thermal Reliefs
||0.010" (drill size)
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