23 bga crack parallel to pad results

The Last Will And Testament of the BGA Void

Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2022/04/last-will-of-bga-void-1.pdf

 Solder crack path typically found at the solder joint / BGA package interface  Void size alone was insufficient to define acceptance for solder joint reliability

Heller Industries Inc.

•  Head-on-Pillow phenomenon •  Standards and their adoption •  Reliability concerns 13 Limitations and Issues 3.5.8 Pad Cratering – defined as a separation of the pad from the PCB resin/weave composite or within the composite immediately adjacent to the pad, also know as “laminate crack

| https://www.eptac.com/wp-content/uploads/2013/08/eptac_08_21_13-1.pdf

” 11 Put the Macro Void to Rest •  Based upon a research of papers on the voiding subject of BGA Voids, The location of the void relative to the solder joint failure crack path had a much larger impact than the presence of the void alone

| https://www.eptac.com/wp-content/uploads/2012/06/eptac_07_18_12.pdf

IPC-7351C Pin 1 Polarity Marking - PCB Libraries Forum - Page 2

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351c-pin-1-polarity-marking_topic1530&OB=DESC_page2.html

(BGA, LGA, CGA, PQFN, PSON, DFN, etc.) the silkscreen polarity is removal of silkscreen. This is because the placement courtyard on "Bottom Only" terminals hugs the component package and there is no room to place a visible silkscreen polarity marker that is located inside the placement courtyard (not enough room). Note

PCB Libraries, Inc.

IPC-7351C Pin 1 Polarity Marking - PCB Libraries Forum - Page 2

PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351c-pin-1-polarity-marking_topic1530&OB=DESC_page2.html

(BGA, LGA, CGA, PQFN, PSON, DFN, etc.) the silkscreen polarity is removal of silkscreen. This is because the placement courtyard on "Bottom Only" terminals hugs the component package and there is no room to place a visible silkscreen polarity marker that is located inside the placement courtyard (not enough room). Note

PCB Libraries, Inc.

IPC-7351C Pin 1 Polarity Marking - PCB Libraries Forum - Page 2

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351c-pin-1-polarity-marking_topic1530_post6265.html

(BGA, LGA, CGA, PQFN, PSON, DFN, etc.) the silkscreen polarity is removal of silkscreen. This is because the placement courtyard on "Bottom Only" terminals hugs the component package and there is no room to place a visible silkscreen polarity marker that is located inside the placement courtyard (not enough room). Note

PCB Libraries, Inc.

SMT Reflow Oven Reflow soldering process-SMT Technical-Reflow oven,SMT Reflow Soldering Oven-cmsadmi

| http://etasmt.com/cc?ID=te_news_industry,24361&url=_print

.  It is recommended to have at least one thermocouple located on a pad towards the edge of the PCB and one thermocouple located on a pad towards the middle of the PCB

IPC-7351C Pin 1 Polarity Marking - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351c-pin-1-polarity-marking_topic1530.html

(BGA, LGA, CGA, PQFN, PSON, DFN, etc.) the silkscreen polarity is removal of silkscreen. This is because the placement courtyard on "Bottom Only" terminals hugs the component package and there is no room to place a visible silkscreen polarity marker that is located inside the placement courtyard (not enough room). Note

PCB Libraries, Inc.

IPC-7351C Pin 1 Polarity Marking - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351c-pin-1-polarity-marking_topic1530_page1.html

(BGA, LGA, CGA, PQFN, PSON, DFN, etc.) the silkscreen polarity is removal of silkscreen. This is because the placement courtyard on "Bottom Only" terminals hugs the component package and there is no room to place a visible silkscreen polarity marker that is located inside the placement courtyard (not enough room). Note

PCB Libraries, Inc.

IPC-7351C Pin 1 Polarity Marking - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351c-pin-1-polarity-marking_topic1530.html

(BGA, LGA, CGA, PQFN, PSON, DFN, etc.) the silkscreen polarity is removal of silkscreen. This is because the placement courtyard on "Bottom Only" terminals hugs the component package and there is no room to place a visible silkscreen polarity marker that is located inside the placement courtyard (not enough room). Note

PCB Libraries, Inc.