microATX Motherboard Interface Specification

Version 1.2

Page 15

Figure 5 specifies the I/O connector zone. Compliance with this recommendation is necessary to ensure

enough clearance between the chassis aperture and motherboard connectors for the I/O shield structure. If the

shield provided with the motherboard requires less than the recommended clearance, then the dimensions of

the I/O connector area can be waived (hatched area in Figure 5: 5.990 inches [152.15mm] by 1.470 inches

[37.34mm]). To retain maximum flexibility, the exact positioning of connectors within the I/O connector

zone is left to the discretion of the motherboard designer.

Figure 5: Motherboard I/O Connector Location Recommendation

Notes:

• Datum B 0,0 = mounting location hole B.

• The face of all I/O connectors should be placed 0.445 inches (11.30mm) from the reference datum and remain within

the zone defined in Figure 5.

• The I/O aperture should be a simple cutout of the chassis back panel. Recessing the I/O aperture will prevent the

case from accepting microATX- and ATX 2.1-compliant I/O shields.