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SEMI F47-0706 (Reapproved 0812) - Specification for Semiconductor Processing Equipment Voltage Sag Immunity

Volume(s): Equipment Automation Hardware;Facilities
Language: English
Type: Single Standards Download (.pdf)
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CURRENT - Supported by the technical committee.


This Standard was technically approved by the global Facilities Technical Committee. This edition was approved for publication by the global Audits and Reviews Subcommittee on June 18, 2012. Available at www.semiviews.org and www.semi.org in August 2012; originally published September 1999; previously published July 2006.


Semiconductor factories require high levels of power quality due to the sensitivity of equipment and process controls. Semiconductor processing equipment is especially vulnerable to voltage sags. This Specification defines the voltage sag immunity required for semiconductor processing, metrology, and automated test equipment. This Specification strikes a balance between voltage sag immunity and increased equipment cost.


This Specification sets minimum voltage sag immunity requirements for equipment used in the semiconductor industry. Immunity is specified in terms of voltage sag depth (in percent of nominal voltage remaining during the sag) and voltage sag duration (in cycles or seconds). This Specification also sets procurement requirements, test methods, pass/fail criteria, and test report requirements.


The primary focus of this Specification is semiconductor processing equipment including but not limited to the following types:

  • Etch equipment (Dry & Wet)
  • Film deposition equipment (CVD & PVD)
  • Thermal equipment
  • Surface prep and clean equipment
  • Photolithography equipment (Scanner, Stepper & Tracks)
  • Ion implant equipment
  • Metrology equipment
  • Automated test equipment
  • Chemical mechanical polishing/planarization equipment


The secondary focus of this Specification is subsystems and components that are used in the construction of semiconductor processing equipment, including but not limited to:

  • Power supplies
  • Radio frequency generators and matching networks
  • Ultrasonic generators
  • Computers and communication systems
  • Robots and factory interfaces
  • AC contactor coils and AC relay coils
  • Chillers and cryo pumps
  • Pumps and blowers
  • Adjustable speed drives


This Specification applies to semiconductor processing equipment to include the equipment mainframe and all subsystems whose electrical power is directly affected by the operation of the equipment’s emergency off (EMO) system.


Grandfather Clause — Equipment, subsystems, and components that were tested or certified under the previous version of this Specification, prior to the publication date of this Specification, do not require re-testing or re-certification until hardware or software design changes that could affect voltage sag immunity are implemented.

Referenced SEMI Standards

SEMI E51 — Guide for Typical Facilities Services and Termination Matrix

SEMI S2 — Environmental, Health, and Safety Guideline for Semiconductor Manufacturing Equipment

Revision History

SEMI F47-0706 (Reapproved 0812)

SEMI F47-0706 (technical revision)

SEMI F47-0200 (technical revision)

SEMI F47-0999 (first published)

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