Mini-ITX Addendum Version 1.1 To the microATX Motherboard Interface Specification Version 1.
1. INTEL CORPORATION (“INTEL”) MAKES NO WARRANTIES WITH REGARD TO THIS SPECIFICATION (“SPECIFICATION”), AND IN PARTICULAR DOES NOT WARRANT OR REPRESENT THAT THIS SPECIFICATION OR ANY PRODUCTS MADE IN CONFORMANCE WITH IT WILL WORK IN THE INTENDED MANNER.
Contents 1 Executive Summary ........................................................................................... 5 1.1 1.2 1.3 1.4 2 6 6 6 6 Layout .............................................................................................................. 7 2.1 2.2 2.3 2.4 3 Terminology ........................................................................................... Reference Documents..............................................................................
Revision History Revision Number 1.1 Description Minor sentence structure corrections made. Title changed to: Revision Date Feb, 2009 ‘Mini-ITX Addendum Version 1.1 To the microATX Motherboard Interface Specification Version 1.2’ to reflect full name of mATX document name. 1.0 Initial release.
1 Executive Summary The Mini-ITX addendum to the microATX Motherboard Interface Specification details the use of the Mini-ITX form factor standard, developed by Via Technologies Inc, for compatibility with Intel based platforms. This document defines only the specific features in Intel’s Mini-ITX based platforms that differ from those of microATX and should be used in conjunction with the governing microATX specification.
1.1 Terminology Term 1.2 Description SFF (Small form factor) 8-19 liter chassis (IDC* definition) Ultra SFF (uSFF) 4-8 liter chassis (IDC* definition) Tiny PC Less than 4 liter chassis (IDC* definition) Reference Documents The following reference documents are posted on the public web site at http://www.formfactors.org Document microATX Motherboard Interface Specification Version 1.
2 Layout This section describes the mechanical specification of the Mini-ITX form-factor motherboard. Size, mounting hole placement, connector placement, and component height constraints are specified. System components such as hard drives, disk drives, and power supplies are not specified, however it is generally recommended to consider what would facilitate assembly, as well as not place components such that they block fan inlets. An example layout is depicted in Figure 1. Figure 1.
2.1 Board dimensions Table 2. Compares ATX, microATX, and Mini-ITX board dimensions 2.2 Dimension ATX microATX Mini-ITX Maximum width Allowable 305mm 244mm 170mm Maximum depth Allowable 244mm 244mm 170mm Mounting Hole Placement Mini-ITX utilizes a subset of ATX mounting holes. To avoid damage to traces on motherboards, chassis standoffs in any locations not specified should be removable or not implemented at all.
Table 3. Motherboard Mounting Hole Locations Form Factor Mounting Hole Locations Mini-ITX C,F,H,J microATX B,C,F,H,J,L,M,R,S ATX A,C,F,G,H,J,K,L,M Figure 3.
2.3 Connector placement All connector locations as well as allowable placement area for I/O connectors on the back panel are described and can be found in the microATX interface specification. 2.4 Height Constraints 2.4.1 Primary (Component) Side Height Constraints One major advantages of the Mini-ITX form factor is its backward-compatibility with the ATX specification. The Mini-ITX motherboard can be installed in any ATX chassis.
Notes: 2.4.2 • All dimensions in the above figure are in millimeters (mm). • The 57mm height restriction in Area A applies to the PC board component height. The actual height of the chassis should include any dynamic excursion considerations for shipping as well as needs to facilitate alternative cooling solutions or airflow considerations.
3 Power Supply Information Provided the very different needs of the platforms that fit in the small desktop form category, this specification does not attempt to define a standard for the power supply to match with the Mini-ITX motherboard specification.
