There are always plenty of fake IC on the Shenzhen local Market, to ensure customer project quality, in PCB assembly works, Makerfabs always purchase IC from IC retailers such as Mouser/Digikey/Farnell, or at least validated trustable local vendors because. But if the IC producer is from Taiwan, it's a bit to deal with, they are not been sold on Mouser/Digikey, and the local channel is confusing.
There one project recently the Taiwan Audio Codex ALC5631Q was used, the official datasheet at http://www.haoyuelectronics.com/service/RK3066/Datasheet/ALC5631Q(RTL5631)%20DataSheet_0.9.pdf
Our currently validated vendor also does not support this IC, so we have to source them on the market, but unfortunately, the PCBA VCC and GND are totally short! Crazy~
Take off the ALC5631Q and detailed checked, we found that the GND is totally short with the Pin16, AVDD. This IC is completely a joke, the only thing it did is shorten the VCC to GND...
And more serious, before we got a working IC, we have tried 3 different sellers, all the same, SHORT, which makes me worried if I misunderstand the datasheet…...
And lucky finally I got working IC:
For the NG ICs, the center pad(GND) is short with the Pin16, while actually, it should be the Pin18 short with GND, but not Pin16
Suggestions to
Makers:
Avoid purchasing IC
from Huaqiang bei or Taobao, unless you become an expert, purchase from Digikey/Mouser,
or seek Makerfabs' helps, especially in PCBA prototyping& small batch production.
We finally got some message for this serious problem. the producer feedback there they have stopped the ALC5631Q production for same reason.. but after that a big company (they do not tell me which company) get the producer and ordered a big batch, but asked a totally different Pin arrangements... these IC get on the market and leads to serious problem...
ReplyDeleteCan not believe such a big Taiwan company Realtek made such a Irresponsible mistake.... there 2 kinds of "ALC5631Q " on the market, with the same name/package and even the customized IC without datasheet. the 2 IC totally Incompatible...
Final Suggestion: AVOID to use IC from Realtek ~~