A global DRAM shortage has left $1 billion worth of Apple A20 Pro processors – built on TSMC’s 2nm process for the iPhone 18 Pro – sitting idle in TSMC’s fab. The wafers are fully manufactured with good yields, but without companion DRAM, advanced stacking packaging cannot begin.

Analyst Liu Peizhen (Taiwan Institute of Economic Research) notes that while TSMC’s revenue base remains solid with AI and flagship mobile orders, DRAM tightness directly disrupts the delivery cadence of advanced-node wafers and packaging services.

Modern high-end processors use die‑stacking packaging – logic chips are incomplete until paired with high‑frequency memory and DRAM. Even with perfect wafer output, missing memory components block final assembly and test, leaving large inventories of high‑value dies on hold. This delays iPhone flagship builds and strains supply chain working capital.

TSMC cannot directly control DRAM suppliers’ capacity allocation. Its levers include flexible line scheduling and supply chain coordination – shifting some capacity to AI/HPC orders less affected by memory shortages, to balance customer mix and mitigate consumer‑side disruptions.

ICgoodFind Take:
DRAM is the new packaging bottleneck. AI’s appetite for memory now chokes consumer flagship schedules. For procurement, this means dual sourcing for DRAM + foundry is no longer optional – and iPhone 18 Pro ramp visibility just got murkier.