Introduction to the SEMI E120 Standard
SEMI E120 defines a standardized object model for representing semiconductor equipment structure and related elements. As part of the Equipment Data Acquisition (EDA)/Interface A standards suite, E120 provides the foundational architecture for how equipment suppliers model and expose their equipment’s external view to factory automation systems.
Purpose of the SEMI E120 Standard
The SEMI E120 Standard serves three critical functions in semiconductor manufacturing environments. First, it provides equipment suppliers with a structured methodology for representing their equipment to factory hosts, ensuring consistency across different equipment types and manufacturers. Second, it functions as a base model that other SEMI Equipment Communication Standards can extend and build upon, promoting interoperability and reducing integration complexity. Third, it serves as the reference architecture for creating technology-specific implementations, such as XML schemas (E120.1) and Protocol Buffers (E120.2), enabling flexible deployment across diverse manufacturing environments.
Key Concepts and Features of SEMI E120
The Common Equipment Model is structured around a hierarchical class system that comprehensively represents equipment components.
- The Equipment class models the tool as a whole, containing MaterialLocations, Modules, Subsystems, and IODevices.
- Modules represent major subsystems which are capable of executing a recipe and processing material, such as process and inspection chambers.
- Subsystems model components that cannot process material independently but do perform some important, complex function, such as load ports and prealigners.
- IODevices capture the values of sensors, actuators, and intelligent sensor/actuator devices.
- MaterialLocations specify where equipment components can hold material, which falls into the categories of Carrier, Substrate, or ProcessDurable.
Additionally, the model includes SoftwareModule classes to document software versions and suppliers, and an Extension mechanism that allows other standards and implementations to expand the base model.
Finally, the model uses LogicalElement classes to represent items that do not directly correspond to some physical aspect of the equipment, such as JobManager, MaterialManager, and EPTTRacker.
The specification also defines attributes, relationships, and inheritance hierarchies that enable factory host applications to understand equipment structure through the available communication interfaces defined by other standards in the EDA suite (notably SEMI E125).
Why SEMI E120 Is Important to the Industry
SEMI E120 delivers substantial value across the semiconductor manufacturing ecosystem.
For Equipment Suppliers:
- The standard provides clear guidance on structuring equipment models, reducing development time and ensuring compatibility with factory systems.
For Semiconductor Manufacturers (IDMs and Foundries):
- These companies benefit from simplified integration processes, as equipment from different suppliers adhere to a common structural framework, enabling faster deployment and reducing customization requirements.
For Software and Automation Suppliers:
- These companies (and in-house developers) can develop applications that work seamlessly across equipment from multiple suppliers, leveraging the standardized model to implement advanced analytics, fault detection and classification (FDC), predictive maintenance, virtual metrology and others.
The standard eliminates data silos by providing a consistent representation of equipment structure, enabling engineers to uncover critical relationships across manufacturing operations. This standardization reduces integration costs, accelerates time-to-production for new equipment, and supports the implementation of Smart Manufacturing initiatives by providing the structural foundation necessary for digital twins and advanced data analytics in semiconductor manufacturing.
What PDF Solutions Products that Support SEMI E120
PDF Solutions offers comprehensive equipment solutions for implementing SEMI E120 compliance.
- Cimetrix® CIMPortal Plus Software Development Kit (SDK) – this toolkit provides equipment manufacturers with tools for designing, developing, testing, optimizing, and deploying EDA communications that fully comply with SEMI E120 and related standards. CIMPortal Plus features an intuitive GUI for configuration of all the capabilities and options specified in the standard. CIMPortal Plus supports both Freeze Version 1 (1105) and Freeze Version 2 (0710) of the EDA/Interface A standards and directly implements SEMI E164 requirements for EDA Common Metadata. CIMPortal Plus also comes with easy-to-use drag-and-drop functionality for efficient equipment model development and many other useful features.
- Cimetrix® ECCE Plus (Equipment Client Connection Emulator) – this product is the globally acknowledged EDA reference client with a graphical interface for testing connections and verifying messages during implementation.
- Cimetrix® EDATester – a test client that includes E134 testing and validation functionality to ensure standards compliant implementations in any supplier’s equipment that implements the EDA standards. Also supports comprehensive performance testing for an EDA interface implementation.
- Cimetrix® EDAConnect – this software library is used forthe factory-side implementation of EDA-enabled client applications. It enables semiconductor manufacturers to gather equipment data for process control, cost reduction, quality improvement, and productivity enhancement initiatives.