Aluminium board

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Hello, On customer want to make a aluminium board. It... - Jul 31, 2007 by karkanov

Hi Karkanov, Depending on how many devices they have, you... - Jul 31, 2007 by Real Chunks

We had no problems reflowing an assembly on Bergquist Therma... - Jul 31, 2007 by davef

It's common the heat sink LED. Here's why: ... - Aug 01, 2007 by davef

karkanov

#51254

Aluminium board | 31 July, 2007

Hello,

On customer want to make a aluminium board. It will have SMD Led on it. Like I never "played" with this before can someone tell me what I know to know on that new thing. What kind of reflow profile we need. What just I be aware of, is there is some difficulties with this process.

Thank You

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Real Chunks

#51257

Aluminium board | 31 July, 2007

Hi Karkanov,

Depending on how many devices they have, you may want to go spot solder with a laser system or light beam system. This worked well on some aluminum boards we did in the past.

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davef

#51264

Aluminium board | 31 July, 2007

We had no problems reflowing an assembly on Bergquist Thermal Clad. The assembly was small. So, we built it on a 8-up fixture. It stayed in the fixture from screen print, through pick and place, and into reflow. When the fixture came out of the reflow oven, it was hotter than a bull moose in mid-October. So, the assemblies would stay liquidous for a few minutes after exiting the oven. So, during that time, we had to be careful not to disturb the fixture until the solder set.

Some suppliers have peculiarities. Like IRC Anotherm� substrates suggest "use of solder alloys containing silver is necessary, such as 62Sn36Pb2Ag or Sn96Ag4." Maybe your supplier can offer helpful guidance.

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davef

#51277

Aluminium board | 1 August, 2007

It's common the heat sink LED. Here's why: http://www.lunaraccents.com/educational-LED-thermal-management.html

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