Heat Sink

Laminated to the outside of the PCB

Quality Manufacturing

We have many years' experience of producing PCBs with heat sinks/thermal planes, giving us the specialist knowledge to manufacture PCBs with 2D and 3D- HS designs to the highest quality. All heat sinks are CNC machined, using high speed routers. Chemical and mechanical deburring processes ensure components are burr free. Additional processes such as milling of three dimensional pockets, countersinking, engraving, etching of component ident, screenprinting etc. can be incorporated. Copper acc. to DIN 1751 or BS 2870 and aluminium acc. to DIN 1712 or

Standard bonding medium for heat sinks is no flow prepreg, and this is CNC machined to your specification, whether this be size for size, under flush or proud of the heat sink. GPV Printca A/S will advise about prepreg lay-out depending on bonding thickness etc.. When bonding on bare base laminate, 1 sheet of prepreg is enough, but when copper pattern is designed on the top layer under the HS, it is necessary to have 2 or 3 sheets of prepreg, depending on isolation demand and copper thickness. The tin/lead shall be stripped off the pattern, designed under the HS. Depending on soft / hard style material and the HS design, it is a risk that the PCB would get warp and twist higher than boards without HS. Typical demand can be 2%. To minimize warp we recommend to use soft style material. For Aluminium L17 and 1050 style is recommended.

To heat sinks in aluminium and copper we can offer a complete finishing process including; chromic, decorative, and hard anodising, in either natural or black; Nickel plating; tin plating and alocroming are also available.

Documentation needed

The drawing should specify type and thickness of material, surface coating, thickness of total construction (HS + Prepreg + PCB), placement options for registration holes.

The outline of the HS shall be a gerber file where the centre of the outline track should represent the edge of the HS.

• Minimum rib between round holes in HS/Prepreg: 0.35 mm
• Minimum rib: single between two rectangle openings: 2.0 mm
• Maximum unsupported rib length: 10 x rib width (1.0 mm support hole, if rib exceeds length demand)
• Registration tolerance, pad on top layer to HS +/- 0.1 mm
• Registration pins for press reg. 3.0 mm holes in two opposite corners of PCB and HS/Prepreg.
• Bonding thickness, 90 microns per prepreg sheet. (See bonding)

Our inspection systems ensure that all quality related functions are controlled methodically throughout all processes to final inspection. Princa AS is committed to an ongoing policy of continuous improvement through quality systems based on ISO 9002. All products are released with a certificate of conformance with full traceability.