Circuit Board Materials Selection

HarryN

Flashlight Enthusiast
Joined
Jan 22, 2004
Messages
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Location
Pleasanton (Bay Area), CA, USA
Hi - I would like some suggestions on the use of FR-4 vs other materials for a PCB for a light. The number one concern is toughness and reliable use over the temperature range of (-40 C) to 55 C in severe vibration use.

The frequency will be DC to less than 1 mhz. Normal Luxeon drive setups. The board will be bonded to an Al base.
 

operator_smooth

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Feb 13, 2005
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64
I do not think that frequency is an issue here. I would only consider mechanical/thermal characteristics in your case.
 

MikeLip

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Nov 27, 2004
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1,247
Location
Painesville, Ohio, USA
FR4 is fine for the temperature range you want. Vibration won't bother it. However, vibration is hell on solder joints. Solder is not intended to retain components - it will fatigue and fail. So don't rely on it. Glue them down. Yes, I have a LOT of experience keeping components on boards in difficult environments - for instance, circuit boards spinning at 15,000RPM for 10,000Gs at the edge! The FR-4 held up just fine though.

Mike
 
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