Apple S3


The Apple S3 is the integrated computer in the Apple Watch Series 3, and is custom-designed "System in Package" by Apple Inc.
The 32-bit chipset was revealed on September 12, 2017. According to Apple, the S3's two cores are 70% faster than the Apple S2. It is able to launch apps faster and allowed smoother user interface in comparison with the S2 chip. The S3 also contains a barometric altimeter, the W2 wireless connectivity processor, and in some models UMTS and LTE cellular modems served by a built-in eSIM. The barometer was integrated to accurately track physical activities.
Tech Insights discovered that the S3 SiP contains 768 MB of DRAM and 16 GB flash memory, 1.5 and 2 times that of the S2.
After the Apple S4 chip was released in 2018, the S3-powered Apple Watch was retained but sold at a lower cost.

Components

Tech Insights identified the following components in the Apple S3 SiP.