Current Specifications
The current published revision of the Power Management Bus (PMBus®) specification is revision 1.4, available upon request.
The current published revision of the Adaptive Voltage Scaling Bus (AVSBus™) specification is revision 2.0, available upon request.
The latest published version of the System Management Bus (SMBus) specification (on which PMBus is based) is revision 3.3, which is freely available for download below from this page.
Older revisions of the PMBus specification are freely available for download on the Specification Archives page.
Request Current PMBus & AVSBus Specs
Anyone can get the current PMBus & AVSBus specs by emailing getpmbusspec@smiforum.org
- Be sure to include your request, your full name, and your company name in text in English in the body of your email.
- We will email the current PMBus & AVSBus specifications to you, normally before the end of the next business day.
- We will put you on the email list for the PMBus quarterly newsletter and occasional emails, unless you request otherwise; you can unsubscribe at any time.
Download Current Specs
PMBus adopters in good standing who have registered for access can download the latest PMBus & AVSBus specifications by logging in and going to the Adopters Area (link near the top right corner of the web page).
PMBus adopters in good standing who have not yet registered for access can apply to register on the registration page.
Download Related PMBus Documents
To download PMBus application profiles and PMBus application notes, got to the Application Profiles & Notes page.
Presentations and articles:
- 2013-09-12 PMBus 1.3 with AVS presentation at Darnell’s Power Forum (DPF) 2013 (22 slides) (.pptx, .pdf)
- 2013-09-04 New PMBus Spec Includes Dedicated AVS Bus by Rich Pell EE Times
- 2014-03-11 PMBus 1.3 with AVS One Pager (.pdf)
Download Current SMBus Spec
The latest published version of the System Management Bus (SMBus) specification (on which PMBus is based) is revision 3.3.1.
- System Management Bus (SMBus) Specification Version 3.3.1 2024-10-20 (.pdf, 775 KB, 83 pages)
Older versions of the SMBus specification, and other SMBus documents, can be found on the SMBus Specifications page on the SMBus website.
Specification Questions
Technical questions about specifications should be addressed to techquestions@smiforum.org.