Electronics Forum: resistor crack (Page 1 of 4)

Chip crack at what stress.

Electronics Forum | Thu Mar 14 09:07:26 EST 2002 | cfraser

I can not tell you what the actual stress limits are. I can tell you that de-paneling PCB's by hand is a very poor choice. I have seen numerous accounts of cracked caps, resistors, and LED�s due to incorrect de-paneling procedures. I would recommend

2010&2512 cracking

Electronics Forum | Tue Feb 16 12:44:05 EST 2010 | esoderberg

95%+ of my boards are small and therefore are panelized using the V-score technique. Getting a lot of resistor cracking even though the resistor is layed out to be perpendicular to the long board edge. What dimension should be used from the board e

Cracks other than MLCC

Electronics Forum | Wed Nov 13 15:00:57 EST 2019 | stephendo

I have seen resistors cracked during placement. The part was programmed incorrectly and the nozzle pushed down on the part too hard. I do not remember seeing any cracked during depanelization. Nibblers can cause damage if they are on the bottom and

Cracks other than MLCC

Electronics Forum | Thu Nov 14 21:53:04 EST 2019 | sssamw

I've seen crack on resistor also.The crack on ICs mainly is on the solder joint due to very high strain.

2010&2512 cracking

Electronics Forum | Tue Feb 23 09:48:26 EST 2010 | dyoungquist

How are you sepatating your boards out of the panel? If you are flexing them to break the V-score, this could be what is causing the resistors to crack.

2010&2512 cracking

Electronics Forum | Tue Feb 23 11:05:46 EST 2010 | kjs123p

We had this same problem several years ago. The caps and resistors were cracking when we snapped the boards apart. We now use a pizza cutter style depanelizer. A couple of manufacturers that I know of are CAB and Fancort. I hope this helps.

Cracks other than MLCC

Electronics Forum | Wed Nov 13 02:28:27 EST 2019 | trino

Hello, I am a Japanese engineer. I am sorry for my unskillful English. Have you ever encountered cracks in chip resistors or IC components due to board mechanical stress? Especially, I'm looking for a case in the PCBs Depaneling process(pizza cutte

Conformal Coating Killing Circuits

Electronics Forum | Thu Aug 20 07:11:25 EDT 2020 | sssamw

What your said looks like a acrylic coating thermal expansion causes small solder joint crack. Do you cure coating with heating, or heating after curing? Solder joint crack while you see resistor and QFN trouble? Clear and detail description of your

Panelized boards

Electronics Forum | Wed Jan 23 12:13:38 EST 2002 | barryg

We have some pcb assy's that are panelized and very narrow brds. We feel that some of the smt resistors may be becoming cracked when breaking them apart. Though we are scoring them deeper here and have requested our brd house to score deeper, is ther

2512 Solder Crack

Electronics Forum | Wed Aug 24 12:37:38 EDT 2011 | hussman

Hello all, We just got some board back from thermal shock and we found that several of the 2512 resistors opened up. Actaully the solder joint cracked away from the board. All other coponents look great. Boards were good before test. 10 layer bo

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