Printed circuit board surfaces

The circuit board surface is responsible for raising the wetting ability of the contact areas for soldering; non-chemical surfaces serve simultaneously as protection against oxidation of the covered copper and improve shelf life characteristics. 

The circuit board surfaces vary in shelf life, typical application field and price, but are normally specified by the process, product or desired location for the application.

Available surfaces

Surface
HAL SnPB > 5µm approx. 12 months 5
HAL lead-free > 5µm approx. 12 months 5
Immersion tin > 1µm approx. 6 months 2
Immersion silver 0,2 - 0,3µm approx. 12 months 5
Immersion gold (ENIG) 3-6µm Ni
0,025-0,1µm Au
approx. 12 months 5
ENEPIG (Ni/Pd/Au) 3-8µm Ni
0,05-0,15µm Pd
0,05-0,1µm Au
approx. 12 months
-
Electroplated soft gold 4-6µm Ni
> 1µm Au
approx. 12 months -
Electroplated hard gold 4-6µm Ni
0,1µm Au -
2µm Au*
approx. 12 months
< * on request
-
Values for shelf life and reflow cycles are guidelines from the process supplier!

HAL lead-free

Printed circuit board surface HAL leadfree.

HAL (Hot Air Levelling) is a well-proven method to apply tin as circuit board surface. Every assembler should be able to process circuit boards with HAL surfaces without any problem. HAL is suitable for standard SMD, but exhibits some weaknesses for fine-pitch applications, for which a chemical surface should be preferred (see also HAL vs.  immersion gold).

Advantages:

  • Good solderability
  • Good reflow properties

Disadvantages:

  • pads are non-planar

Immersion tin

Printed circuit board surface immersion tin

This is a very popular circuit board surface, which competent assembly companies have no trouble in processing, because its properties are very close to those of HAL. Due to the  quick oxidation of the copper, the storability depends on temperature and packaging. It is imperative to avoid fingerprints on the surface.

Advantages:

  • Absolutely flat
  • Good for fine pitch
  • Good for SMD
  • Good for press-fit

Disadvantages:

  • Extra charge
  • Critical manufacturing process
  • Faster oxidation, thus limited storability

Immersion silver

Printed circuit board surface immersion silver

This circuit board surface is very similar to immersion tin, with better properties for oxidation and contact applications.

Advantages:

  • Absolutely flat
  • Good for fine pitch
  • Good for SMD
  • Good for press-fit
  • Better storability than immersion tin

Disadvantages:

  • Extra charge

Immersion gold

Printed circuit board surface immersion gold

Just as with immersion tin and immersion silver, immersion gold is an extremely flat circuit board surface, and has very good oxidation properties. It is perfectly suited for fine pitch and bonding (aluminium wire) applications.

Advantages:

  • Absolutely flat
  • Very good for fine pitch
  • Very good for SMD
  • Very good wetting characteristics
  • Good for press-fit
  • Good storability

Disadvantages:

  • Extra charge

ENEPIG

Printed circuit board surface ENEPIG

ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold) is an extremely flat circuit board surface, and has very good oxidation properties. It is perfectly suited for soldering applications and aluminium-wire- / gold-wire-bonding.

Advantages:

  • Absolutely flat
  • Very good for alu-wire-bonding
  • Very good for gold-wire-bonding
  • Very good for fine pitch, SMD
  • Very good wetting characteristics
  • Good storability

Disadvantages:

  • Extra charge

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SMD Stencils

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SMD Stencils

 

Pricing Examples

Printed Circuit Boards always include:

- E-Test
- Solder-stop 2x
- Marking print 1x
- Gerber-Import
- Scoring (series)
- Design-Rule-Check

- Tooling costs
- Photoplot
- Conductors 150μm
- Drill holes 0,3mm
- Unlimited drilling
- HAL, FR4 1,6, 35μm Cu

Prototypes
2 layers - 5 WD
41,- €
1 Printed circuit board 100x100mm
4 layers - 5 WD
98,74 €
1 Printed circuit board 160x100mm
6 layers - 6 WD
158,20 €
1 Printed circuit board 160x100mm
Series
e.g. 100 pcs. PCB 100x100mm
2 layers - each
3,74 €
 
4 layers - each
5,64 €
 
6 layers - each
7,30 €
 
8 layers - each
14,25 €
 
SMD Stencils
max. 200x300mm - 3WD
47,50 €
1 Stencil, including 1000 pads
max. 600x600mm - 3WD
90,44 €
1 Stencil, including 2500 pads

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