In IC final testing process,it will lead to a big excursion of device mix,due to double device in testing socket.So,there are many kind of way to detect the double device,but all the ways are not so robust.Plant a mini LED under the testing socket will obviously improve the detecting rate,this solution is easy and low cost,suitable to all kind of thin thickness IC.
IC testingsocketresidual(double device)mini LEDcamera
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