SeekingAlpha quotes BlueFin Research analyst John Donovan saying a small basement fire in a cleanroom at ST fab in Crolles, France, halted SPAD chips production for Apple and other companies:
"This fab is the sole manufacturing facility for STM’s 3D sensors. This incident has currently shutdown the facility and our research indicates it could take several weeks to requalify the fab and resume production. Our understanding is that several AAPL employees are on site in Crolles presently. These 3D sensors have a long production cycle time and relatively low yield rates, which will make it difficult for STM to get back on their production schedule target with each day that the fab is incapacitated."