microATX Motherboard Interface Specification

Version 1.2

Page 18

(9.600)

[243.84]

(9.600)

[243.84]

AREA B

AREA A

AREA C

REF (BOARD MTG HOLE)1.350

[34.29]

REF

(BOARD MTG HOLE)

.400

[10.16]

2.050

[52.07]

3.750

[95.25]

8.250

[209.55]

6.100

[154.94]

7.100

[180.34]

9.200

[233.68]

Area Maximum component height (in inches)

A Motherboard component height, 2.80 inches [71.12mm] maximum

Chassis clearance over motherboard, 3.0 inches [76.20mm] required

Chassis clearance over motherboard, 3.5 inches [88.90mm] recommended

B 0.60 inches [15.24mm] (expansion slot area)

C 1.50 inches [38.10mm] (see Notes)

Figure 7: microATX Motherboard Maximum Component Height Restrictions

Notes:

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

• The component height requirement assumes a motherboard thickness of 0.062” (1.57 mm). The maximum height

specified for Area C is intended to avoid interference between motherboard components and the chassis structure

and to provide backward-compatibility with microATX 1.0 or higher.

• When designing a microATX motherboard, attention should also be paid to keepouts specific to the specifications

for the type of add-in card slots being integrated into the motherboard, which may have additional requirements for

motherboard component heights. Examples of this are the PCI and AGP add-in card specifications which require a

maximum component height in the area between the card connector and the rear panel that is less than the Area B

component heights.