Schweizer: Multilayer

Background

SCHWEIZER's rigid multilayer PCBs can contain plated and non-plated through hole and blind & buried vias. Multilayer PCBs are produced with FR4 or higher quality base materials. As standard, a maximum of 18 layers are used and PCB thicknesses in the range of 0.6 mm to 3.2 mm are realised.

Applications

Control devices in the automotive sector, aviation engineering, communications electronics, and industrial electronics

Benefits

For the miniaturisation of electrical devices, wiring can take place over multiple layers to save space and increase the packing density of the components. The layers can be electrically connected by means of mechanically drilled via holes and blind & buried vias.

Special features

To increase reliability for complex lay-ups with via holes, buried vias, and blind vias, the plugging process can be used if required. The plugged holes can also be plated over with copper if necessary.

Schematic layout of a multilayer PCB with buried vias, plugged buried vias, and plugged and over-plated buried vias

Parameter	Standard	High standard
Number of layers	1-18	>18
PCB thickness	0.6-3.2 mm	0.2-4.2 mm
Maximum PCB size	584*575 mm²	584*575 mm²
FR4 materials: Glass transition temperature	140°C, 150°C, 170°C	>170°C
Glass fabric	106, 1080, 2116, 7628	106, 1080, 2116, 7628
Copper foils	18 µm, 35 µm, 70 µm, 105 µm	210 µm, 400 µm
Inner layer thickness	75 µm, 100 µm, 150 µm, 200 µm, 360 µm, 510 µm, 710 µm, 1000 µm, 1200 µm, 1500 µm	50 µm
Min. track width and conductor spacing of outer layer*	70 µm / 70 µm	60 µm / 60 µm
Min. track width and conductor spacing of inner layer*	60 µm / 60 µm	50 µm / 50 µm
Smallest drill diameter	0.2 mm	0.15 mm
Aspect ratio	1:6	1:8
Outer layer annular ring	150 µm	100 µm
Inner layer annular ring	200 µm	150 µm
Min. solder mask dam*	80 µm	50 µm
Solder mask color	Green	Blue, red, white, black
Final finishes	Imm. tin, OSP, imm. NiAu (ENIG), ENEPIG/ENEPAG, Plated NiAu, HAL, Bond Gold, Hard Gold	Imm. silver
Legend print color	Yellow, white, black	Blue, red