Semi E26

SEMI E26 defines Radial Cluster-Tool Footprint, the standard that specifies the overall floor-space envelope a cluster tool occupies — measured as a radius from the central handler robot out to the outermost edge of any attached process module — so fab facilities teams can plan clean-room layout, aisle spacing, and tool-to-tool clearance before a specific vendor's module configuration is even finalized. Where SEMI E21 and E22 guarantee a module is mechanically and dynamically compatible with the handler itself, E26 answers a completely different question that facilities engineering needs answered much earlier in a project: how much total floor area does this cluster tool, fully configured with whatever modules a process engineer eventually selects, actually need to reserve?

Facilities team plans clean-room floor layout
Before final module selection is locked in
SEMI E26 radial footprint envelopeWorst-case radius reserved regardless of which modules attach
Radius measured from handler center
To the outermost point of any compliant module
E26.1 defines the 300 mm version
Larger footprint class for 300 mm wafer tools
Floor space reserved matches actual installed footprint
No re-plan needed when module mix changes later

E26's value is that it decouples floor-space planning from module-selection timing: because every module compliant with E21/E22 is guaranteed to fit within E26's radial envelope, a fab can commit clean-room floor space for a cluster tool platform before deciding whether it will eventually carry four etch chambers, two etch and two deposition, or any other mix — the facilities plan doesn't have to be redrawn every time the process engineering team changes its module configuration. E26.1 scales this same radial-footprint concept for 300 mm tools, whose correspondingly larger handler and module envelopes (following from E21.1 and E22.1's larger mechanical and exclusion-volume dimensions) push the reserved floor radius outward compared to the 200 mm case E26 originally codified — getting the size class right matters because under-provisioning floor space for a 300 mm platform using 200 mm-era footprint assumptions is exactly the kind of planning error that only surfaces once equipment arrives and doesn't fit the bay.

SEMI E26 — Radial Cluster-Tool Footprint one reserved radius, independent of final module mix E26 footprint radius — reserved floor space Handler robot Etch module within radius Deposition module within radius Any future module still within radius E26.1 defines this same reserved-radius concept scaled for 300 mm tools The facilities plan never has to be redrawn when the module mix changes

E21, E22, and E26 together give a fab everything needed to plan a cluster-tool installation end to end: E21 fixes the mechanical interface, E22 fixes the reachable space behind it, and E26 fixes the total floor space the whole assembly needs — mechanical compatibility and facilities planning, covered by three standards that are designed to be read together.

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