Report: Low yields force TSMC to revert to 8 inch wafers for Apple iPhone 6 fingerprint sensors

Report: Low yields force TSMC to revert to 8 inch wafers for Apple iPhone 6 fingerprint sensors
According to a published report on Tuesday citing industry sources, Apple wanted TSMC to produce fingerprint sensors for its next-gen Apple iPhone using the silicon slinger's 12 inch facilities and 65nm process. But the low yields associated with this technology has forced a change. Apple has decided to go with TSMC's 8 inch processing in order to get the kind of yields it needs to produce a large number of handsets.

Had TSMC and Apple gone with the 12 inch WLPs, TSMC would have produced the entire chip, including the back-end testing and packaging, in-house. With the move back to 8 inches, TSMC will work on the front-end while back end packaging will be subcontracted to firms like Xintec and China WLCSP.

Yield rates for 8 inch wafers exceed 95% while they drop down to between 70% to 80% for the 12 inch wafers at TSMC's Southern Taiwan Science Park. While the Apple iPhone 5s was in its early days of production, yields on the 8 inch wafers were low enough to hinder production. Eventually, TSMC should be able to pick up yield rates on the larger wafers which will save money for Apple.

source: DigiTimes

Related phones

iPhone 6
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  • Camera 8 MP / 1.2 MP front
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  • Storage 128 GB
  • Battery 1810 mAh(14h 3G talk time)



1. markhsu

Posts: 15; Member since: Mar 17, 2012

TSM having yield issues? The hell you say. If they are already having yield issues with the fingerprint sensor imagine what will happen with the A8. I hear a call to their old pal Sammie coming.

2. Finalflash

Posts: 4063; Member since: Jul 23, 2013

Classic TSMC, a lot of people called it out when the switch to TSMC was announced. This is just them dropping the ball again as they did almost every time with Nvidia and ATI. This is on the 65 nm node too, how the hell are they going to produce anything on their 20 nm node with something like an A8?

3. roscuthiii

Posts: 2383; Member since: Jul 18, 2010

TSMC? They Sorta Misconstrue Competency?

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