Ming-Chi Kuo: iPhone 15 Pro overheating issues likely due to thermal system design compromises to achieve a lighter weight, and are unrelated to TSMC's 3nm node
My survey indicates that the iPhone 15 Pro series overheating issues are unrelated to TSMC's advanced 3nm node.
Context & Ripple Effects
Reports of iPhone 15-series heat complaints had already made the issue visible to buyers, including accounts that devices became hot during charging or prolonged use early user reports of iPhone 15 heat. Kuo’s assessment narrows one possible source of blame: the manufacturing node is not, in his view, the relevant fault line.
The diagnosis also sits against prior coverage that Apple had explored vapor-chamber cooling for future iPhones. Subsequent company comments cited iOS and third-party-app factors alongside the warmer-than-expected reports, leaving a hardware-software interaction rather than a single component explanation.
First-order effects
- Scrutiny shifts from TSMC’s 3nm process toward Apple’s thermal design trade-offs in the iPhone 15 Pro models, if Kuo’s assessment is correct.
- Affected users may still depend on software and app updates for near-term relief, while the reported hardware constraint is not something a patch can fully change.
Second-order effects
- Apple’s component and industrial-design teams face a tighter trade-off between device weight and heat dissipation in subsequent Pro designs; cooling architecture becomes a more consequential specification.
- TSMC avoids having this episode directly framed as evidence of a 3nm-node defect, preserving the distinction between chip fabrication and handset-level thermal integration.
Third-order effects
- If thin-and-light flagship designs continue to raise thermal limits, thermal management will increasingly act as a product-performance constraint alongside chip process advances.
- The episode points to a broader need for clearer attribution of device problems across silicon, hardware design, operating systems, and apps; that division will remain uncertain when multiple layers can contribute.
The trend: As mobile silicon advances, handset makers are increasingly managing performance through whole-device thermal design rather than treating the chip node as the sole determinant of real-world behavior.