SK Hynix HBM4 16-Hi volume shipping; CoWoS lead times stretch to 78 weeks
Silicon Analysts Weekly for the week of 2026-09-07 to 2026-09-14: SK Hynix HBM4 16-Hi volume shipping; CoWoS lead times stretch to 78 weeks. A sourced, provenance-marked briefing on AI-chip supply-chain and pricing movements — HBM spot prices, wafer pricing, foundry and CoWoS capacity, per-chip bill-of-materials cost, and HBM qualification status — derived from public data and human-reviewed. Part of the Silicon Analysts semiconductor data layer.
The take
SK Hynix moving HBM4 16-Hi to volume shipping for Vera Rubin is the sharpest supply-chain signal this week — it cements first-mover advantage before Samsung clears HBM4 qualification with NVIDIA. CoWoS lead times stretching to 78 weeks mean packaging, not silicon, remains the binding constraint for anyone building AI systems today.
What moved this week
Samsung × NVIDIA (HBM3E 12-Hi) — now Qualified (source)
TSMC CoWoS lead time — ▲ now 52 to 78 weeks (was 2026 52-78 weeks) (source)
Broadcom CoWoS customer allocation — now 2026 ~150,000–240,000 CoWoS wafers (~15% of total allocation) (was 120K to 130K wafers) (source)
Samsung HBM bit share — ▼ now ~17%–33% across periods (Q1 2026 ~21–22%, Q2 2026 ~33%, with one estimate at ~17–20%) (was ~25-40%) (source)
SK Hynix HBM bit share — now ~50%–62% depending on period (Q1 2026: ~56–58%; Q2 2026: ~50%; one estimate ~60–62%) (was ~50–70% (Goldman Sachs/analyst estimates ~50%+; Counterpoint reports ~70%)) (source)
TSMC CoWoS capacity — ▲ now ~120,000–130,000 wafers per month by 2026 (was Q4 2026 120,000–130,000 wafers/month) (source)
TSMC CoWoS capacity — ~141,000–170,000 wafers per month in 2027 (with some plans citing up to 200,000 by… (source)
Supply-chain & pricing signals
TSMC August Revenue Surges 53.3% YoY on AI Chip Demand Momentum — TSMC's NT$514.81B August revenue (10.1% MoM growth) confirms sustained foundry demand acceleration well above H1 baseline, validating AI capex cycle persistence through 2H2026. 50.31% net margin demonstrates foundry pricing power despite competitive intensity. (MarketBeat) · _In our data:_ TSMC — 7 developments tracked this quarter · TSMC storyline
US Tightens AI Chip Export Controls to China; Huawei Capability Gap Extends to 2027 — Trump administration rejecting advanced AI chip sales to China and locking down export controls creates structural supply bifurcation. Huawei's inability to match US/Allied chip quality until end-2027 reshapes semiconductor value chains, forcing China-centric design ecosystems and potentially accelerating domestic fab investments. (Hudson Institute) · _In our data:_ foundry economics storyline
ASML High-NA Adoption Accelerates: TSMC, Samsung, SK Hynix Set Production Timelines — Major chipmakers committing to High-NA lithography signals sustained capital intensity in advanced nodes. ASML's expanded Eindhoven facility positions equipment suppliers to benefit from multi-year AI-driven capex cycle through 2030. (Reuters) · _In our data:_ SK Hynix — 16 developments tracked this quarter · SK Hynix storyline
HBM watch
Samsung × NVIDIA (HBM4): now In qualification — entered final qualification phase after supplying initial samples in September. (source · timeline)
Samsung × NVIDIA (HBM4 12-Hi): now In qualification — Bloomberg reporting confirms Samsung in final qualification stage for the 12-Hi stack configuration. (source · timeline)
SK Hynix × NVIDIA Vera Rubin (HBM4 16-Hi): Not started →Volume shipping — SK Hynix began mass production of its 48 GB 16-layer HBM4 device in Q3 2026. (source · timeline)
HBM4 capacity — was 48 GB → now 36 GB (The HBM4 reference row carried the 16-Hi stack capacity (48 GB, a 2027 part) while every HBM4 figure published alongside it — Rubin at 8 sta)
tsmc-12 tech_node_class — was 5nm Class (7nm + 5nm, 75/25) → now Mature (>=40nm) (TSMC's FY2025 Form 20-F lists Fab 12's most advanced technology for volume production as 40 nm at 2025 year-end, and the column is maintaine)
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