PCB – Specifications
Technology
Material
We use FR4 Material with a TG of 135.
Printed circuit boards consist of a non electrical substrate where one or two copper foils are
laminated on. The substrate of FR4 consists of a glass fiber fabric which is soaked with epoxy
resin.
Number of layers
We deliver PCBs from 2 till 8 layers.
PCBs with two layers are called double sided boards. PCBs with more than two layers are
called multilayer.
Hereby several innerlayer cores and copper foils (for the outer layers) are pressed together
with prepregs (glass fiber fabric soaked with epoxy resin).
PCB thickness
PCBs are available with following thicknesses
1.00 mm
1.55 mm
2.40 mm
Please don’t hesitate to contact us if you have other requests.
Available PCB sizes
The maximal producible PCB size is 426 x 271 mm.
Copper thickness
You can choose between 35 µm and 70 µm final copper thicknesses. Respectively on inner or
outer layers.
The end copper thickness is made up of the base copper thickness and the electro-plated
copper thickness. The electro-plated copper thickness is nominal 25µm.
Design tip
To ensure an even deposition of the metal, the layout should have an even distribution
of copper. We recommend filling open surfaces with grid copper.
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Technology
Layout
Outer Layers
100µm structures
35µm end copper
125µm structures
35µm end copper
150µm structures
35µm end copper
192µm structures
70µm end copper
Track width / track spacing
≥ 100µm / 100µm
≥ 125µm / 125µm
≥ 150µm / 150µm
≥ 150µm / 192µm
Spacing pad / pad
≥ 100µm
≥ 125µm
≥ 150µm
≥ 192µm
Spacing track / track
≥ 100µm
≥ 125µm
≥ 150µm
≥ 192µm
Inner layers
100µm structures
35µm end copper
100µm structures
35µm end copper
100µm structures
35µm end copper
100µm structures
35µm end copper
Isolation spacing
≥ 100µm
≥ 125µm
≥ 150µm
≥ 192µm
Annular ring
To plan the layout data correctly, the pad- or final-Ø should be dimensioned according to the
following standard.
Pad-Ø = Final-Ø + 0.40 mm
This is based on our standard hole-Ø tolerance of +0.10 / -0.05 mm for plated-through holes.
Glossary
Due to frequent demand, some terms related to annular ring are defined here
Pad-Ø
Ø of pad area
Final-Ø
nominal-Ø of the hole, sometimes also called hole-Ø
Tool-Ø
drill tool-Ø; is defined by us
Annular ring
solderable ring on finished circuit board
Hole-Ø tolerance
min. and max. deviation from final-Ø
UL-marking
Generally, all PCBs will be marked with an UL-marking and manufacturer date (WW/YY), if
there is no spacing problem. The positioning will be in the silk screen and the soldermask. If
you wish an explicit position, the marking will be placed there.
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Technology
Solder mask
The solder mask fulfils different functions on the PCB. It serves as protection of the PCB from
corrosion, mechanical damage and prevents short circuits and a moistening of certain areas
when soldering the PCB.
Moreover the solder mask improves electrical characteristics like the dielectric strength.
To keep the soldering surfaces free of lacquer, the pads in the solder mask have to be larger
than the conductive pattern. We will perform this optimization for you if your layout is not
conform with the following standard.
Pad-Ø solder mask = Pad-Ø of conductive pattern + 0.15 mm
We use a green photosensitive solder mask; tabs can be imaged reliably starting at 70 µm.
Finish surface
To prevent oxidation of the open copper on the PCB surface and allow perfect soldering, the
surface can be protected with several materials.
We offer you the following finish surfaces:
HAL leadfree
with the HotAirLeveling the PCB is dipped in liquid tin. The tin
adheres on the copper surface. The redundant tin is blown off
by air.
Tin (Sn)
Silver (Ag)
ENIG (Ni/Au)
on the surfaces tin, silver and ENIG a thin layer of metal
is applied to the PCB surface by an electrochemical process.
The advantages are: less thermal load of the PCB compared
to HAL, defined thickness of the metal layer and denser
structures on the PCB can be processed.
leadfree
We offer the surface “leadfree” as our cheapest one. In this
case we choose the surface HAL leadfree, tin, silver or ENIG
by our own.
All offered surfaces have a solderability of minimum 12 months.
Silk screen
The silk screen marks the locations to place the components on the board. The silk screen is
also called placement print, legend print, item print or annotation print.
Colour:
Character height:
white
≥125 µm
Design tip
The character height has to be minimum 125µm to be regularly readable. The distance
between the characters has to be minimum 100µm to avoid the coalescence of the
colour.
The front size has to be 6,5 x character height; the front width has to be 3,5 x character
height.
To read the print easily the silk screen may not be placed over the soldering surface.
If we found such locations we will delete them for you.
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Technology
E-test
With the e-test the PCBs are checked for electrical defects. Hereby, there is a measuring
clamping between endpoints of the power grids to obviate breaks and short circuits.
For double sided boards we offer e-test optionally
For multilayers (<2 layers) the e-test is inclusive
Mechanical treatment
A distinction is made between plated-through (PTH) and non-plated-through (NPTH) drills.
Plated-through holes as a component drill have the function to solder wired components on
the PCB. As a via-hole those drills connect the several layers of a PCB together.
Non-plated-through holes do not assume tin solder at the soldering process therefore they
stay solder-less and open. Those are used to fix the PCB or will be used for registration holes
in the production process.
Breakthroughs or slots are routed or nibbled regardless of their state of metallization. If they
are not plated-through, they are generally implemented with the outline. If they are platedthrough, they will be implemented either by extra work performed during the first run or by
adding another process step.
The mechanical processes of routing and scoring are available for processing the circuit board
contour. Standard routing tools of 1.60 mm, 2.00 mm and 2.40 mm are used.
With scoring, the surface of the PCB is grooved to a defined score-web. The scoring angle is
30°, the standard score-web is 0.30 mm with a tolerance of ±0.10 mm.
To avoid forming burrs the spacing between copper and scoring should be at least 0.40 mm
(PCB thickness 1.00 mm), 0.50 mm (PCB thickness 1.55 mm) or 0.70 mm (PCB thickness
2.40 mm).
This makes it easier to break out the PCBs. Scoring is only possible in horizontal and
vertical way. Scoring in diagonal and round way is not possible.
After break out the PCB will be extend about 0.30mm (0.15mm per side).
The distance between copper and PCB contour has to be at least 0.50mm for scoring and
0.25mm for routing. If this is not considered in your layout we will correct such locations for
you.
Multiple panel
If different circuit boards are already placed in a panel, please use the "panel from file“ option
in the configurator. You only need to indicate the dimensions of the delivery panel.
If you have the data for a single circuit board which you want in a delivery panel, you can
select the "panel with online configuration" option and create the delivery panel.
The mechanical process can be realized through scoring or routing, or a combination of both.
By routing the PCBs will be hold through a tab. There are standard routing tools with diameter
1.60mm, 2.00mm and 2.40mm available.
By scoring the PCBs will be placed edge to edge in the panel.
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Technology
General
In our specifications we've put together a package for you which offers the best possible value
for you. We will be glad to fulfill any additional requirements you might have; we will bill the
resulting extra expense accordingly.
To avoid further inquiries and additional costs, we especially recommend to create radiuses
less than 0.80mm when working on the contours.
If you would like to have your layout optimized, we would be glad to do this for you. The hourly
rate for this work is € 75.00.
We will archive your data. You can place a repeat order in your personal account at any time.
You can also order an SMD stencil at any time. We will need to charge € 25.00 for generating
and shipping soldering paste data.
For technical reasons it is not possible to provide you certificates or documents for delivery. If
you need such documents, we will be glad to submit you an offer outside of our pool service.
Please ask us about it.
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