What this driver is
SMH (VanEck Semiconductor ETF) is the engine's primary sensor for the semiconductor complex. When SMH posts a meaningful negative five-day return, the engine interprets this as near-term pressure on the sector. The driver does not necessarily mean the long-term AI capex cycle is broken. It means the market is, in the short run, reducing exposure to semiconductor names.
What activates it
The engine computes SMH five-day returns each cycle. When the return falls into the tactical weakness range (a meaningful decline that is not large enough to constitute a severe breakdown), this driver activates. The engine distinguishes between tactical weakness (a pause or consolidation) and a structural break.
What it connects to
Semiconductor weakness creates near-term headwinds for:
- AI infrastructure hardware — the physical supply chain depends on healthy semiconductor demand
- Data centre power — reduced semiconductor activity can reduce power demand expectations
- Memory and storage — interconnected with the logic chip cycle
The driver does NOT block the underlying AI capex story in the engine. It creates near-term caution within the theme without invalidating the structural driver.
The distinction from a breakdown
Tactical weakness means the sector is digesting gains, rotating, or responding to a specific negative catalyst that may not persist. A structural break would require SMH to fall more than eight percent over five days. The engine uses separate thresholds for these two scenarios.
How Decifer tracks it
SMH five-day returns are computed each cycle. The tactical weakness range is calibrated to the middle band of the return distribution. When SMH enters this range, the engine adds a caution note to AI supply chain themes without deactivating the core AI capex driver.