Flex PCBs

Flex PCBs

Flex PCBs, also known as flexible printed circuits or flexible electronics, provide greater options for designers and engineers when assembling electronic circuits.

They are constructed from flexible, high-performance plastic material, usually polyimide, which enables the board to bend or "flex" during use. This flexibility opens them up to use in a wide range of applications.

Here are the most common types of flex circuit construction:

  • Single-sided flex PCB
  • Back-bared flex circuits
  • Double-sided flex PCBs
  • Multi-layer flex circuits
  • Rigid flex PCB
  • Sculptured flex circuit board

Flexible PCB Capabilities & Tolerances

MULTI-LAYER FLEX CIRCUITS ENGLISH METRIC
Maximum Board Size
19.68" x 13.38"
500 x 340 mm
Maximum Board Thickness 1 (copper) layer
8.5 mil
0.22 mm
  2 layers
12.6 mil
0.32 mm
  4 layers
16.5 mil
0.42 mm
Minimum Board Thickness 1 (copper) layer
2.5 mil
0.065 mm
  2 layers
4.7 mil
0.12 mm
  4 layers
11.8 mil
0.30 mm
Maximum Number of Layers
16 layers
Minimum PTH (Plated Thru Hole) diameter
0.0079"
0.2 mm
Maximum aspect ratio
10:1 (max. thickness 0.0066", min. PTH 0.0079")
10:1 (max. thickness 2mm, min. PTH 0.2 mm)
Minimum Traces/Spaces
0.002" / 0.002"
0.05 mm / 0.05 mm
SURFACE FINISHES TYPES
Lead Solder (HASL)
OSP (Entek)
Lead Free Solder (HASL)
Electrolysis gold plating
Immersion Gold (Electroless Nickel Gold - ENIG)
Immersion Tin (White Tin)
Immersion Silver
 
MATERIAL
FR-4
Teflon
FR-5
Polyimide
Aluminum
BT
Other material available upon request