Summary

  • Mitsubishi Electric said on 3 August that two semiconductor factories had temporarily stopped after the 28 July Kumamoto earthquake.
  • The company aims to move both factories to normal operating conditions during August.
  • The public update does not identify the two plants, give separate restart dates or say how much production is running now.
  • No lost output, scrapped work in progress, customer delay, insurance recovery or financial effect has been disclosed.
  • The new timetable is a material recovery signal, but normal operation still has to be proved through output, yield and shipments.

A recovery month is not a production number

The change is a company timetable. Mitsubishi Electric has moved from an unbounded factory stoppage to an August objective for normal operations at two semiconductor sites affected by the Kumamoto earthquake. The wire report carrying that statement was published at 09:37 UTC on 3 August, inside this briefing's fixed window.

That is useful information for customers planning inventory and alternative supply, but it leaves the economic size of the disruption open. The accessible update does not name the two plants, distinguish their operating states or quantify the share of normal capacity already available. Mitsubishi lists semiconductor locations at Kōshi and Shisui in Kumamoto, but that background cannot be used to assign the announcement to specific facilities.

The safest reading is therefore narrow: two factories stopped, and management now expects a transition to normal operation within the month. It is not evidence that either factory is already at normal output.

Restart has several gates

Semiconductor production does not return in one step. Buildings and utilities can be cleared before sensitive tools are inspected, calibrated and qualified. Machines can restart before process yield stabilises. Wafers can move again before finished devices pass testing and reach customers.

Each gate moves cost to a different party. Mitsubishi bears inspection, restart, scrap and overtime costs. Customers bear lead-time risk and may use inventories or qualify alternatives. Suppliers and logistics providers bear schedule volatility. Insurers may absorb part of physical loss, but no claim or coverage has been disclosed.

The August objective describes the operating gate, not the commercial outcome. Without product mix or allocation data, it is not possible to say whether power devices, radio-frequency components, optical devices or another line carries the largest exposure. Nor is there evidence of a customer shortage or a price response.

The missing bridge is output

Mitsubishi's own materials describe automated semiconductor operations in Kumamoto and business-continuity measures at its Shisui SiC wafer facility. Those design claims explain why recovery speed matters, but they do not establish the condition of either plant covered by the new announcement.

The next evidence should be plant-specific: the date each site resumes, the percentage of normal wafer starts, whether work in progress was discarded, when normal yield returns and whether shipments are delayed. A financial estimate would show whether the interruption is being absorbed inside routine operating costs or passed into revenue, margin, customers or insurance.

Until then, the August target reduces uncertainty without closing it. The company has supplied a deadline for normalisation, not the production bridge needed to measure recovery.

Sources