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Capabilities & manufacturing rules

Every limit along the production chain — from base material to testing. Written as a reference to keep open while laying out, not as marketing copy.

Layer count 2 – 40+
Min. track 75 µm
Microvia ≥ 0.10 mm
Class IPC-A-600 Cl. 2 / 3

Capability matrix

[ Core overview ]

Standard runs without a query. Advanced is feasible but affects price or lead time. On request means technically possible but project-dependent — let us talk it through.

Parameter Standard Advanced On request
Layer count 2 – 16 18 – 40 > 40
Track / gap 100 / 100 µm 75 / 75 µm —
Outer copper 35 µm 70 – 105 µm > 105 µm
Inner copper 17 µm 35 – 70 µm > 70 µm
Board thickness 0.8 – 2.4 mm 0.4 – 3.2 mm < 0.4 / > 3.2 mm
Mech. drill Ø ≥ 0.20 mm ≥ 0.10 mm —
Microvia Ø ≥ 0.10 mm stacked / staggered —
Aspect ratio, rigid 8 : 1 14 : 1 at Ø 0.20 mm · 16 : 1 at Ø 0.25 mm —
Aspect ratio, rigid-flex 10 : 1 12 : 1 —
Annular ring ≥ 125 µm ≥ 75 µm —
Solder mask dam 70 – 150 µm by colour — —
Impedance tolerance ± 10 % — tighter after technical review
Material FR-4 Tg 150 High-Tg, halogen-free Polyimide, ceramic
Surface finish ENIG, imm. tin Hard gold, OSP, HASL Combinations
Class IPC-A-600 Cl. 2 Class 3 Cl. 3 with docs

Values apply to standard rigid FR-4 build-ups; the track, gap and annular ring minimums to 18 and 35 µm copper. Advanced values are verified minimums and are confirmed against your data. Rigid-flex and ceramic have their own limits — see the chapters below and the product pages.

01 Base material FR-4, High-Tg, halogen-free, polyimide, ceramic — including IPC slash sheet.

Material choice sets temperature resistance, signal behaviour and price. FR-4 at Tg 150 covers most applications; High-Tg from Tg 170 is recommended for multiple solder cycles and high layer counts.

Standard
FR-4, Tg 150 °C, IPC-4101/24
High-Tg
Tg 170–180 °C, recommended from 8 layers
Halogen-free
to IEC 61249-2-21
Special
Polyimide, ceramic, PTFE on request
Design note Above eight layers or with multiple lead-free solder cycles, choose High-Tg — the extra cost is small against the delamination risk.
02 Stackups Standard build-ups as a starting point, custom after feasibility review.

Approved standard build-ups are held in stock and noticeably shorten lead time. Custom build-ups are possible but need a feasibility review before ordering.

Standard stackups
4, 6, 8, 10, 12, 16 layers
Symmetry
symmetrical build mandatory
Prepreg
1080, 2116, 7628
Custom
after review, +2 working days
Design note An asymmetric build almost always causes warpage. If asymmetry cannot be avoided, please discuss it in advance. Currently: prepreg types 1080, 2116 and 7628 are in short supply — see the electronic glass fabric market update.
03 Structures Track width and isolation gap per final copper weight.

The minimum manufacturable structure depends directly on final copper weight — the thicker the copper, the wider track and gap must be. Values apply to outer layers.

18 µm
75 / 75 µm
35 µm
75 / 75 µm
70 µm
150 / 200 µm
105 µm
180 / 300 µm
Design note For even copper deposition the layout should have an even copper distribution. Please hatch large copper areas.
04 Signal integrity Impedance definition, material choice, hybrid build-ups, TDR measurement.

Controlled impedance requires a complete statement in the data set: layer, structure, target value and tolerance. Without a reference layer no value can be calculated.

Single-ended
50 Ω standard
Differential
90 / 100 Ω
Tolerance
± 10 %, tighter after technical review
Evidence
TDR measurement with coupon
Design note Impedance-controlled layers need a test coupon in the panel. It costs area but is the only evidence in a complaint.
05 Drilling & plating PTH / NPTH, microvia, aspect ratio, via pads, press-fit tolerances.

The ratio of board thickness to drill diameter limits platability. Rigid builds are verified up to 14:1 on a 0.20 mm hole and 16:1 on a 0.25 mm hole; rigid-flex runs 10:1 as standard and 12:1 after a special check.

Mech. drill
≥ 0.20 mm preferred, 0.10 mm minimum (± 0.05 mm)
Laser drill
≥ 0.10 mm
Aspect ratio
8:1 preferred, up to 14:1 (Ø 0.20 mm) / 16:1 (Ø 0.25 mm)
Press-fit zone
tolerance ± 0.05 mm
Design note Pad Ø = final diameter + 0.35 mm. Smaller pads are possible but reduce the annular ring below the standard value.
06 Plugging & filling Tenting, plugging, filling — effect on assembly and heat dissipation.

Vias in pad must be filled and capped, otherwise solder paste wicks into the hole. Tenting is sufficient for vias outside the solder area.

Tenting
one or both sides
Plugging
solder resist, non-conductive
Filling + capping
via-in-pad, plated flat
Heat dissipation
filled thermal vias
Design note Vias should not be closed from one side only — trapped chemistry causes outgassing during soldering.
07 Resists & inks Solder resist to IPC-SM-840, colour options, legend print.

The solder resist protects and defines the solderable areas. The dam between two pads determines how fine assembly can go.

Standard
IPC-SM-840 class T
Colours
green, black, white, blue, red
Dam
by colour: green 70 µm · red 100 µm · blue / black 135 µm · white 150 µm
Legend
character height ≥ 0.8 mm
Design note With ENIG and immersion tin a wider solder mask dam is recommended — both processes attack the resist more aggressively.
08 Surface finishes ENIG, imm. tin, HASL, OSP, hard gold — thickness, shelf life, suitability.

The finish follows component pitch, soldering process and storage time. For fine pitch and BGA, flat immersion finishes are first choice.

ENIG
Ni 3–5 µm / Au 0.025–0.075 µm · 12 months
Imm. tin
0.8–1.2 µm · 6 months
Lead-free HASL
1–40 µm · 12 months
Hard gold
Ni 3–6 µm / Au 0.8–1.2 µm · 12 months
Design note HASL is unsuitable below 0.5 mm pitch and for HDI — the uneven topography causes bridging.
09 Routing & bevelling Scoring, routing, laser cutting, edge connector bevels, edge plating.

The outline is produced by routing or scoring. Scoring is cheaper but requires rectangular boards in the panel.

Cutter Ø
0.60 – 2.40 mm standard, 0.50 mm possible
Dimensional tolerance
± 0.1 mm routed
Scoring
rectangular outlines only
Bevel
15 – 60° (± 5°), 30° / 45° preferred
Design note Internal cut-outs with sharp corners cannot be routed — a radius equal to the cutter radius always remains.
10 Delivery panel Panelisation and panel utilisation — a direct lever on unit price.

Utilisation of the production panel often sets the unit price more than the technology does. Adjusting outer dimensions by a few millimetres can lower price noticeably.

Panel border
8 – 12 mm
Web
0.4 mm on routed panels
Fiducials
3 per panel
Max. panel size
610 × 508 mm
Design note Before fixing outer dimensions, a short query pays off — we check panel utilisation and report optimisation potential.
11 Tests E-test, AOI, microsection, impedance measurement, X-ray, reliability testing.

Every board is electrically tested. Optical inspection and microsection run alongside production, additional tests on request.

Electrical test
100 %, flying probe or fixture
AOI
all inner and outer layers
Microsection
per production lot
Additional
X-ray, solderability, thermal shock
Design note For first articles we recommend a microsection report as part of sampling — it documents the build-up verifiably.
12 Specifications IPC-A-600 Class 2 as standard, Class 3 on request, UL, EN 45545-2.

Acceptance criteria follow IPC-A-600. Class 3 applies to safety-critical applications and requires tighter tolerances plus additional documentation.

Standard
IPC-A-600 Class 2
Elevated
Class 3, with test documentation
UL
UL 94 V-0, factory marking
Railway
EN 45545-2 with halogen-free material
Design note Please state Class 3 in the enquiry — it affects build-up, annular rings and test scope, not just acceptance.
13 Coverlay Coverlay for flexible zones, dielectric strength, design rules.

In flexible zones coverlay replaces solder resist. It is mechanically more robust but cannot be structured as finely.

Material
polyimide with adhesive
Thickness
25 / 50 µm
Opening tolerance
± 0.2 mm
Bend radius
≥ 6 × thickness, dynamic ≥ 20 ×
Design note The transition between rigid and flexible zone must not contain a plated hole — bending stress peaks there.

Borderline design?

This page covers the standard. If your layout goes beyond it, we check feasibility against your data — before you freeze the design.