Register as an employee of a SMIF member company

If your company is a SMIF member listed at, apply here for access to the members area. If your company is also a PMBus® adopter, you get access to the PMBus adopters area as well

All fields are required. Email given must belong to a recognized email domain of the SMIF member company.

Full name:
Job Title:
Phone (with country code):
Location (city,state/province,country):

(Please provide a unique user ID for yourself for log-in purposes)


PMBus® Specifications

Revision 1.3 of the PMBus specification introduced the enhanced version of PMBus with AVS.

PMBus 1.3 includes:

  • Higher speed communication to reduce latencies
  • A dedicated Adaptive Voltage Scaling (AVS) bus to statically and dynamically control processor voltages
  • General enhancements and improvements from 1.2

PMBus 1.3.1 includes:

  • clarifications to streamline implementation

PMBus adopters in good standing can download the latest released PMBus 1.3.1 specification by logging in and going to the home page.

All others can get the specification by emailing

  • Be sure to include your request, your full name, and your company name in text in English in the body of your email.
  • Normally, the current PMBus specification will be delivered to you by email before the end of the next business day.
  • Note: We may use the email address you supply to contact you regarding PMBus.

Older PMBus specifications are publicly available for download on the Older Specifications page.

Additional information on PMBus 1.3:

SMBus 3.1 Specification

Older versions of the SMBus specification can be found on the SMBus Specifications page on the SMBus web site.

Specification questions

Technical questions about specifications should be sent to

Applied Power Electronics Conference and Exposition (APEC)
Phoenix Convention Center
Phoenix AZ
21–25 March 2021

Membership has new web-based
advantages for adopters.

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