Electronics Forum: led and tombstoning (Page 1 of 12)

lead free and tombstoning

Electronics Forum | fredericksr |

Thu Feb 16 12:42:03 EST 2006

lead free and tombstoning

Electronics Forum | Thu Feb 16 12:41:50 EST 2006 | fredericksr

Hey folks, I was interested in any information that you might have on tombstone reduction when using a lead free solder and profile. Thanks for any input that you may have! -Russ #x

lead free and tombstoning

Electronics Forum | Fri Feb 17 09:02:21 EST 2006 | russ

proper pad geometries, accurate placement, and good reflow profile. Are you having problems right now?

lead free and tombstoning

Electronics Forum | Fri Feb 17 11:01:47 EST 2006 | amol_kane

with lead-free solders, one would expect to find less instances of tombstoning. this is because SAC alloys are not eutectic and melt over a range of temp (usually 217-220 deg C) instead of at a single temperature. therefore the forces due to solder s

difference between led and neon bulbs

Electronics Forum | Sat Aug 22 09:09:31 EDT 2015 | tvliquidator

what is the technical difference between led and neon bulbs

difference between led and neon bulbs

Electronics Forum | Fri Aug 28 12:11:10 EDT 2015 | davef

LED: [Light-emitting diode] https://en.wikipedia.org/wiki/Light-emitting_diode Neon lamp: https://en.wikipedia.org/wiki/Neon_lamp

0402 tombstoning and dewetting on QFP256 trade-off

Electronics Forum | Fri Mar 06 16:17:38 EST 2009 | aj

whats your board finish?

0402 tombstoning and dewetting on QFP256 trade-off

Electronics Forum | Thu Mar 05 11:53:09 EST 2009 | dcell_1t

Hello to all. for certain time, we have been struggling with some issues on a PCB where have tombstoning on 0402 components (due to pad design) and dewetting in qfp256 0.5 mil pitch (discussed on another threads on this forum) component, we have pro

0402 tombstoning and dewetting on QFP256 trade-off

Electronics Forum | Thu Mar 12 06:37:48 EDT 2009 | gregoryyork

I agree you are too cold for the profile get it up to 230C and possibly allow it to dwell a little longer in preheat as opposed to pushing up the reflow zone only. Sn90/Pb10 melts at 220C so 2C hotter than your profile so you are reliant on it alloyi

0402 tombstoning and dewetting on QFP256 trade-off

Electronics Forum | Fri Mar 06 02:47:15 EST 2009 | lococost

Have you tried higher peaktemp? I saw the QFP is sn90pb10, This has a liquidus of 268 - 302 C. A good paste should be able to handle 230C (or more), of course you would need to check your other components peak temp.

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