Nothing shows Apple's chips are what pushed TSMC to 87 days of inventory
In other words, tight memory supply is real.
But my understanding is that there has been no dramatic scenario in which TSMC first built up US$1 billion of WIP and then had to wait for memory to arrive before packaging could proceed.
A story went around last week that $1 billion of Apple 2nm processors were sitting unpackaged because the memory to finish them could not be found. Ming-Chi Kuo, the Taiwan-based semiconductor analyst, has effectively denied it.
Apple scrambles to secure DRAM as $1 billion of iPhone 18 chips reportedly await packaging (DigiTimes, 2026-08-06)The claim began in the newsletter of Tim Culpan, a journalist based in Taiwan, and spread when DigiTimes carried the same account the same day. The evidence offered for it was TSMC's inventory.
The inventory really did rise
A chipmaker's days of inventory expresses how many days of sales the stock on hand corresponds to. When that number grows, the usual reading is that more has been built than sold.
The rise is real. But TSMC's chief financial officer attributed it to the N2 ramp, and the measure also counts finished goods, raw materials and spare parts, so Apple's chips cannot be separated out of it.
TSMC Q2 2026 earnings call (2026-07-16) · retrieved 2026-08-10
This is the point Kuo presses. Inventory days usually rise when an advanced node first ramps, which is not unique to this year, and Apple is not the only customer on 2nm in 2026: AMD and MediaTek are there too.
Why packaging would need the memory
For the report to hold, one condition has to be true. The memory has to be present at the moment the processor is packaged. Phone processors have long been built with DRAM sitting on top of the chip as a single block. Apple's next-generation processor is said to move that pairing further upstream, binding processor and memory into the same module. If so, the picture of packaging halting and wafers piling up for want of memory does hold together. That detail, though, also comes from Culpan's reporting, and neither Apple nor TSMC has confirmed it.
Processor and memory are bound into one package. Without memory, packaging stops and wafers pile up.
Apple orders three months ahead against the memory it expects. There is no reason to stockpile at TSMC.
The same rise in inventory splits on whether the bottleneck sits at the packaging step or at the moment the order is placed.
What both sides say
On one point the two do not disagree. Kuo says his own checks confirm that Apple has cut its hardware shipment plans this year because of the memory shortage.
Apple Cutting Back 2026 Hardware Shipments Due to Memory Shortage (MacRumors, 2026-08-10)The same report names the Mac Studio, the Mac mini and the MacBook Air, and says the iPhone 18 Pro line due in September will not be plentiful either. The explanation offered is that memory makers are filling higher-margin data-centre orders first, pushing consumer devices back in the queue. So what is actually in dispute is not whether memory is short but where that shortage has come to a stop. If it is stuck at the packaging step, September's launch volumes are directly at risk; if it was absorbed at the ordering stage, the volumes were planned smaller from the start and the launch itself proceeds. If the Q3 inventory days TSMC reports in October come back below 87, this build was the mark of a node ramping; if they hold or climb, another reason is still there.
- Ming-Chi Kuo published a piece pushing back on the backlog story that spread last week.
- The story rested on a real fact, that TSMC's inventory had grown, which made it read as coherent.
- But the reason TSMC gave for the build was the N2 ramp, and the measure also counts finished goods and raw materials.
Scheduled for gradingAwaiting grading
Sources
- Original Ming-Chi Kuo on Medium · 2026-08-10
- Culpium Tim Culpan's newsletter, where the $1 billion claim originated; only the public summary was visible · 2026-08-05
- DigiTimes The Taiwanese outlet that carried the same claim the same day · 2026-08-06
- TSMC earnings call Q2 2026 inventory days of 87, up 7 from the prior quarter, attributed by the CFO to the N2 ramp · 2026-07-16
- MacRumors Reporting that Apple is cutting 2026 hardware shipments over the memory shortage, naming the Mac Studio, Mac mini, MacBook Air and the iPhone 18 Pro line · 2026-08-10
- TechSpot Reporting that Apple's A20 Pro packages the processor together with DRAM; this detail comes from the same reporting chain and is not confirmed by a primary source · 2026-08-06
Retrieved 2026-08-10 · the 87 and 80 inventory-day figures are from TSMC's Q2 2026 earnings call (2026-07-16). The $1 billion claim and the packaging description originate with Culpium and were relayed by other outlets; neither is confirmed by a primary source