ATX12V Power Supply Design Guide - Version 2.01 - Revision History

Oct 12, 2026

ATX12V Power Supply Design Guide, Version 2.01, documents Intel’s guidance for designing ATX12V power supplies, including important disclaimers and limitations of liability. It provides revision history from versions 1.0 through 2.01, capturing changes to electrical performance and requirements such as efficiency targets, power and current guidance, connector definitions, acoustic levels, terminology updates, and adjustments to rails like removal of -5V reference and other rail-specific guidance. The guide notes that use is at the user’s own risk and information may change without notice.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages44

Reading Time1 h 51 min

AccessFree to download

Introduction

Scope

Key Changes for ATX12V Version 2.0 as Compared with ATX Power Supply

Increased +12 VDC output capability

Minimum Efficiency

Main Power Connector

Separate current limit for 12V2 on the 2x2 connector

Terminology

Applicable Documents

Electrical

AC Input

Input Over-current Protection

Inrush Current Limiting

Input Under-voltage

Regulatory

ATX12V Power Supply Design Guide Version 2.01 IMPORTANT INFORMATION AND DISCLAIMERS INTEL CORPORATION (AND ANY CONTRIBUTOR) IS PROVIDING THIS INFORMATION AS A CONVENIENCE AND ACCORDINGLY MAKES NO WARRANTIES WITH REGARD TO THIS DOCUMENT OR PRODUCTS MADE IN CONFORMANCE WITH THIS DOCUMENT. THIS DOCUMENT IS PROVIDED "AS IS" AND INTEL DISCLAIMS ALL EXPRESS AND IMPLIED WARRANTIES, INCLUDING THE WARRANTY OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE. IN ADDITION, INTEL (AND ANY CONTRIBUTOR) DOES NOT WARRANT OR REPRESENT THAT THIS DOCUMENT OR ANY PRODUCTS MADE IN CONFORMANCE WITH IT WILL OPERATE IN THE INTENDED MANNER, ARE FREE FROM ERRORS OR DEFECTS, OR ARE SAFE FOR USE FOR ITS INTENDED PURPOSE. ANY PERSON USING THIS DOCUMENT OR MAKING, USING, OR SELLING PRODUCTS IN CONFORMANCE WITH THIS DOCUMENT DOES SO AT HIS OR HER OWN RISK. INTEL DISCLAIMS ALL LIABILITY ARISING FROM OR RELATED TO USE OR IMPLEMENTATION OF THE INFORMATION PROVIDED IN THIS DOCUMENT, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHTS RELATING TO THE INFORMATION OR THE IMPLEMENTATION OF INFORMATION IN THIS DOCUMENT. INTEL DOES NOT WARRANT OR REPRESENT THAT SUCH DEVICES OR IMPLEMENTATION WILL NOT INFRINGE SUCH RIGHTS. INTEL IS NOT OBLIGATED TO PROVIDE ANY SUPPORT, INSTALLATION OR OTHER ASSISTANCE WITH REGARD TO THE INFORMATION OR PRODUCTS MADE IN ACCORDANCE WITH IT. THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE INFORMATION REFERRED TO IN THIS DOCUMENT IS INTENDED FOR STANDARD COMMERCIAL USE ONLY. CUSTOMERS ARE SOLELY RESPONSIBLE FOR ASSESSING THE SUITABILITY OF THE INFORMATION FOR USE IN PARTICULAR APPLICATIONS. THE INFORMATION IS NOT INTENDED FOR USE IN CRITICAL CONTROL OR SAFETY SYSTEMS, MEDICAL OR LIFE SAVING APPLICATIONS, OR IN NUCLEAR FACILITY APPLICATIONS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED HEREIN. Intel and Pentium are registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries. Other names and brands may be claimed as the property of others Copyright © 2004 Intel Corporation. 2 Revision History | Version | Release Date | Notes | | | | --- | --- | --- | --- | --- | | 1.0 | Feb, 2000 | • | Public release | | | 1.1 | Aug, 2000 | • | Increase 3.3 V current; add more explanation for power sharing; do minor edits and format fixes | | | 1.2 | Jan, 2002 | •
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• | Typical Power Distribution. Change +5V loading on all power supplies distribution tables defined in DG to 0.3A
PS_ON\# Add text “The power supply should not latch into a shutdown state when PS_ON\# is driven active by pulses between 10ms to 100ms during the decay of the power rails.”
Remove –5V from all power distribution tables. | | | 1.3 | April, 2003 | •
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• | Update Power and Current guidance
Added efficiency guidance at typical and light load Increased min efficiency at full load from 68% to 70% Serial ATA* connector definition added
Acoustic levels added for low noise power supply design Reformat and update revision table
Update Disclaimers
Remove guidelines for ATX
Remove guidance for –5V rail
Updated guidance for Energy Star and stand by efficiency | | | 2.0 | February, 2003 | •
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• | Added Terminology section
Updated power and current guidance
Includes 250W, 300W, 350W, and 400W guidance Updated cross regulation graphs
Updated load tables
Updated required efficiency targets. Added recommended efficiency targets.
Increased required minimum efficiency at typical and light load. Main Power Connector changes to 2x12 .
Aux power connector removed. Required Serial ATA Connector.
Isolated current limit on 2x2 connector for 12V2 rail. | | | 2.01 | June, 2004 | •
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• | Updated 3.3 V remote sense pin \# on the main power connector Updated 12V2 DC Output Noise/R

FAQs

What is the purpose of the ATX12V Power Supply Design Guide Version 2.01?

It provides Intel’s design guidance for ATX12V power supplies and specifies technical requirements and changes across revisions.

What types of updates are recorded in the revision history?

The revision history includes changes to power/current guidance, efficiency targets, connector definitions, noise/acoustic levels, terminology, and rail-related specifications such as removing -5V reference and updating current limits.

What legal and usage limitations are stated in the guide?

The guide provides information “as is,” disclaims warranties, limits liability, states the information may change without notice, and requires users to assess suitability for their specific applications at their own risk.

Oct 12, 2026

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