Heat Sinks for Power Devices > Dense Design
- Designed for high airspeed environments (400-800 LFM)
- Highly suitable for the impingement cooling mode
- Dense pin fin heat sinks generate substantial cooling power in high airspeed environments
- Dense pin fins are highly-suitable for the impingement cooling mode, in which a fan is placed on top of the pins, blowing air directly into the pin array
- In the impingement cooling mode additional cooling power is generated due to additional turbulence created inside the pin array
- For the purpose of mounting fans in the impingement cooling mode, heat sinks are available with threaded stand offs inserted on top of the pin array(optional)
- Cool Innovations is committed to the provision of custom parts in a cost effective fashion, generally without any tooling or setup charges. Customizable parameters include length, width and height
- Cool innovations' heat sinks are lapped in order to reduce the contact resistance between the heat sink and the device
- Dense pin fin heat sinks range from a footprint of 2.50" x 2.50" to a footprint of 9.80" x 9.80" and from an height of 1.0" to a height of 1.7"
- Dense pin fin heat sinks for Power devices are manufactured via the Cold Forging process
- The cold forging process allows for the use of highly conductive aluminum alloys
- The process ensures that no air bubbles, cavities or any other impurities are trapped within the material
- Aluminum pin fin heat sinks are forged from pure aluminum (AL1100)
- The thermal conductivity of AL 1100 is 1510 btu/in ft2 hr of. (~50% higher than AL 380, a common cast alloy)
- Pin fin heat sinks for SM devices are lapped
- The lapping process significantly improves the flatness and the surface finish of the base of the heat sink, when compared to conventional base finishing processes
- The contact resistance between the heat sink and the device is reduced significantly following the completion of the lapping process
- Flatness: Better than 0.001 inch/inch
- Surface Finish: 16 RMS or better
- Anodize - black, hard black, clear, red
- Nickel (electroless or electrolytic)
Manufacturing Technology
Materials
Base Finish
Plating (optional)
All heat sinks are 6/6 RoHS compliant
- Densely configured pin fins provide additional cooling power when placed in the impingement cooling mode
- Impingement cooling consists of a fan being placed directly on top of the heat sink, in a perpendicular fashion
- Impingement cooling provides up to a 20 per cent performance premium when compared to traditional cooling from the side
- In the impingement cooling mode, the air is distributed evenly along the surface of the heat sink, thus eliminating the temperature gradient that is typical to horizontal cooling. The larger the heat sink, the more significant this effect is
- The additional cooling power stems from the increased air turbulence between the pins in the impingement cooling mode
