Semi E22

SEMI E22 defines Transport-Module End-Effector Exclusion Volume, the standard that specifies the three-dimensional swept space a cluster tool's wafer-handling robot arm and end-effector occupy while reaching into any attached process module — a volume every module designer must keep clear of fixed hardware so the standardized robot from SEMI E21 can actually move without colliding with something unique to that module's internal layout. E21 guarantees every module presents the same mounting flange and port geometry; E22 is the companion standard that guarantees the space behind that port — where the arm actually swings and extends — is also predictable, because a module could satisfy E21's interface dimensions at the opening and still crowd the robot's reach with an oddly placed sensor, bracket, or chamber wall just past it.

SEMI E21 defines the port/flange interface
Standard opening every module presents
SEMI E22 exclusion volumeThe swept space behind that opening must stay clear
Module hardware kept outside the envelope
No brackets, sensors, or walls inside the robot's reach
E22.1 defines the 300 mm version
Scaled envelope for 300 mm wafer handling
Robot extends/retracts without collision
Guaranteed across any vendor's module design

The reason exclusion volume needs its own standard separate from the mounting interface is that a collision-free swept volume is a dynamic, three-dimensional constraint — the arm's full range of extension, rotation, and wrist motion as it reaches in and pulls a wafer out — not a static opening dimension, and a module vendor designing only to E21's flange spec could still place internal hardware that technically fits through the opening but fouls the arm mid-reach. E22.1 scales this same exclusion-volume concept specifically for 300 mm wafer handling, where the larger wafer diameter and correspondingly larger end-effector geometry shift the swept envelope's dimensions relative to the 200 mm case E22 originally codified, which matters because a module built to the wrong size class's exclusion volume will either crowd a 300 mm arm or waste usable chamber space designed around an oversized 200 mm envelope.

SEMI E22 — End-Effector Exclusion Volume the swept space behind the port, not just the opening itself Process module interior (side view) E21 port E22 exclusion volume — must stay clear bracket violation wafer on end-effector E22.1 defines this same envelope scaled for 300 mm wafer handling a module that satisfies E21's opening can still violate E22's swept volume A static opening can be correct while the dynamic space behind it isn't

E21, E22, and E22.1 together form the complete mechanical guarantee a cluster-tool platform makes to every module vendor: E21 fixes the interface, E22/E22.1 fix the reachable space behind it, and only with both satisfied does SEMI E38's choice between a unified or subordinate communication model actually sit on solid physical ground.

Take SEMI E22 further

Ask the copilot about this term, or have our engineers assess it against your process.

Ask CFSGPT about this → Request a technical assessment → Open the CFS app