When semiconductor equipment reaches the evaluation stage, manufacturers can encounter issues that could have been addressed much earlier in the design process. Missing documentation, improperly selected components, incomplete risk assessments, and overlooked safety requirements can lead to redesigns, project delays, and additional engineering costs.
Many of these challenges can be reduced by considering SEMI S2 requirements from the beginning of equipment development. Instead of treating compliance as a final hurdle, manufacturers can integrate safety and conformity requirements directly into their engineering process.
In this blog, we’ll look at how designing with SEMI S2 in mind from day one can create a more efficient path to evaluation while supporting safer, better-documented equipment.
What You Can Expect From the Video and Blog
- Understand why SEMI S2 should influence equipment design from the earliest stages.
- The importance of performing an initial risk assessment.
- How documentation and component selection affect compliance.
- Why mechanical and electrical requirements should be addressed early.
- Practical design practices that can help reduce evaluation delays.
- How early collaboration with compliance experts can support the process.
Why SEMI S2 Compliance Should Start During Design
It can be tempting to view compliance as something that happens after the equipment has been designed and built. In practice, SEMI S2 requirements can influence numerous aspects of a semiconductor manufacturing system.
These considerations may include:
- Electrical design
- Mechanical design
- Process hazards
- Ergonomics
- Exhaust ventilation
- Fire risk
- Safety systems and interlocks
- Equipment documentation
Addressing these requirements while engineering decisions are still being made allows potential conformity issues to be identified before they become expensive changes.
When compliance is considered early, the eventual evaluation becomes less about discovering fundamental design problems and more about verifying that the equipment meets the applicable requirements.
Begin With an Initial Risk Assessment
An initial risk assessment should be one of the first steps in equipment development.
Rather than waiting until the system is complete to identify potential hazards, engineers can evaluate the proposed equipment and determine which areas of SEMI S2 apply to the design.
This changes the question from:
“How do we make this equipment compliant after it is built?”
to:
“What hazards does this equipment present, and how should we address them through the design?”
Identifying hazards and applicable requirements early gives engineering teams a clearer roadmap for development. Electrical, mechanical, process, ergonomic, ventilation, fire, and other relevant hazards can then be considered as part of the normal design process.
Identify the Applicable Standards Early
SEMI S2 covers a broad range of environmental, health, and safety considerations for semiconductor manufacturing equipment, but it does not exist in isolation.
Depending on the equipment and its hazards, engineers may also need to consider related standards and guidelines.
These can include:
- SEMI S6 for exhaust ventilation.
- SEMI S8 for ergonomics engineering.
- SEMI S14 for fire risk assessment and mitigation.
- NFPA 79 for industrial machinery electrical systems.
- IEC 60204 for electrical equipment of machines.
Determining which requirements apply early in development helps prevent engineering teams from discovering additional design obligations late in the project.
It also allows those requirements to become part of design reviews, component selection, documentation, and prototype development.
Select Components With Compliance in Mind
Component selection can have a significant impact on the evaluation process.
Critical electrical and mechanical components should be properly rated for their intended applications and supported by the necessary conformity information.
For mechanical systems, this can include verifying factors of safety for components involved in lifting, pressure, and structural applications.
For electrical systems, critical components should be evaluated for their ratings, approvals, and intended use. This includes components operating at line voltage, components at specified power levels, and components used within safety systems.
Maintaining a Critical Components List, or CCL, alongside the Bill of Materials helps ensure that important component information is organized and available when the equipment is evaluated.
Choosing proven or previously approved components when appropriate can also reduce unnecessary complications later in development.
Build Documentation as You Design
Documentation is an important part of demonstrating compliance.
Instead of trying to reconstruct technical information after engineering is complete, manufacturers should develop and organize documentation alongside the equipment itself.
Important documentation may include:
- Electrical schematics
- Interlock schematics
- Critical Components Lists
- Component data sheets
- Material property sheets
- Mechanical calculations
- Safety labeling information
- Installation documentation
Engineers should collect relevant data sheets and material information as components are selected. These files can then be incorporated into the equipment’s technical documentation as the project progresses.
This approach reduces the amount of information that must be tracked down immediately before an evaluation and helps ensure that design decisions can be supported with appropriate evidence.
Develop Complete Electrical Documentation
Electrical documentation deserves particular attention during the design process.
A complete schematic should identify the devices used throughout the system, including safety interlocks and protective devices. Schematics should also correspond with the Bill of Materials and Critical Components List.
Important electrical details can include:
- Device designators
- Load designators
- Overcurrent protection
- Neutral conductors
- Grounding
- Wire sizes
- Wire colors
- Source voltages
- Maximum source currents
- Load voltages
- Maximum load currents
Designators should also correspond with physical labels on the equipment where required.
Creating this level of documentation while the electrical system is being developed is significantly easier than reconstructing it after the machine has already been built.
Address Mechanical Safety During Engineering
SEMI S2 compliance extends well beyond the electrical cabinet.
Mechanical systems can introduce significant hazards and should be evaluated as part of the overall equipment design.
Lifting Systems
Lifting equipment should be designed with appropriate factors of safety and supported by engineering calculations.
Load testing can also be used to validate the design before implementation. Addressing these requirements before the equipment is manufactured helps prevent structural changes later.
Seismic Design
Equipment should also account for applicable seismic considerations.
When installed and anchored according to the manufacturer’s documentation, equipment should be capable of experiencing anticipated seismic forces without overturning or experiencing failures that could create unacceptable risks to personnel or the environment.
This means anchoring requirements and structural behavior should be considered during equipment development rather than after installation.
Piping and Pressure Systems
Rigid and flexible piping used to carry liquids or gases should be capable of withstanding anticipated internal and external stresses.
Pipes and tubing should also be appropriately secured or protected against external stresses and strains, with suitable factors of safety incorporated based on the application.
Pressure ratings, component selection, and supporting calculations therefore become important parts of the mechanical design process.
Standardize the Engineering Process
Manufacturers can make future SEMI S2 projects more efficient by developing repeatable engineering practices.
Rather than approaching every new system as a completely independent compliance project, organizations can establish internal resources such as:
- Approved component libraries
- Critical Components List templates
- Manual templates
- Nameplate templates
- Pre-audit test forms
- Standard electrical schematics
- Safety interlock design practices
- Internal design checklists
Standardization helps engineering teams incorporate known requirements into new projects from the beginning.
Over time, this can create a more predictable development process in which compliance becomes part of normal engineering rather than a separate activity performed at the end.
Conduct Design Reviews Before Formal Evaluation
Early design reviews provide an opportunity to identify conformity issues while changes are still relatively easy to make.
A design-phase conformity assessment can examine areas such as:
- Product requirements
- Hazard and risk analysis
- Applicable standards
- Design guidelines
- Prototype safety
- Alpha and beta systems
- Documentation requirements
- Testing requirements
Finding a problem on a schematic or during a design review is generally far more manageable than discovering the same issue after equipment has been assembled and prepared for formal evaluation.
This is also where working with experienced product safety and compliance professionals can provide significant value.
How HTDS Helps Manufacturers Design for SEMI S2 Compliance
High Tech Design Safety (HTDS) works with semiconductor and industrial equipment manufacturers throughout the design and conformity process.
Rather than waiting until a completed machine is ready for evaluation, HTDS can support manufacturers during development by helping identify applicable requirements and potential conformity issues earlier in the project.
Support can include:
- Risk assessment and hazard identification.
- Standards identification.
- Design reviews.
- Electrical and mechanical design guidance.
- Critical Components List development.
- Manual and nameplate templates.
- Electrical power and safety interlock schematics.
- Pre-audit testing.
- Evaluation and testing support.
- Technical documentation development.
This approach helps manufacturers establish a more direct path from equipment design to evaluation and eventual conformity.
Summary: Build Compliance Into the Equipment
Designing semiconductor equipment for SEMI S2 compliance should begin long before the final evaluation.
Manufacturers that consider applicable standards, hazards, documentation, components, and safety systems during development are better positioned to identify problems while they are still manageable.
The objective is not simply to prepare a machine to pass an evaluation. It is to create an engineering process in which safety and conformity requirements are considered alongside performance, reliability, and functionality from the beginning.
Key Takeaways
- SEMI S2 considerations should begin during the initial design phase.
- An early risk assessment helps identify applicable hazards and requirements.
- Related standards should be identified before the design becomes finalized.
- Critical electrical and mechanical components should be properly rated and documented.
- Technical documentation should be developed alongside the equipment.
- Electrical schematics should accurately reflect the physical system and its safety features.
- Lifting, seismic, piping, and pressure requirements should be addressed during mechanical design.
- Standardized templates and approved components can make future projects more efficient.
- Early design reviews can identify issues before they result in costly redesigns.
- Working with compliance specialists during development can create a more efficient path toward SEMI S2 conformity.
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What should you check out next? What is SEMI S2? A Practical Guide for Semiconductor Equipment Manufacturers, Semiconductor Laser Safety Beyond Compliance, A Guide to SEMI S2 Compliance for Semiconductor Equipment Design
