Intel Pentium 4 Processor 478-Pin Socket (mPGA478) Design Guidelines

Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478)
R
15
Dimension Minimum Nominal Maximum
Cam Height Above Substrate Shelf
(from contact surface to top surface of socket)
1.5 mm
Socket overall width (X without lever) 36.8mm 37mm 37.2 mm
Socket overall length (Y without lever) 45 mm
Post actuated pin to motherboard pad distance (Y) 0.30 mm 0.71 mm
Assembled Cover Flatness 0.20 mm
Cover Standoff height 0.25mm
1
0.30mm
1
0.35mm
1
Co-planarity
 Lead / Surface Mount Feature
 Solder Ball
0.15 mm
0.20 mm
Solder Ball/lead Diametrical True Position
 Pattern Locating
 Feature Relating
0.406 mm
0.25 mm
Gold plating thickness 0.762µm (30µin)
Nickel plating thickness 1.27µm (50µin)
Cover Hole Diameter Design Specific Design Specific
Cover Hole Virtual Condition (Pattern Locating) Guarantee ZIF
condition
Design Specific
1
Cover Hole Virtual Condition (Feature Relating)
Guarantee ZIF condition
Design Specific
1
Cover Hole Lead in Diameter Design Specific
1
Design Specific
1
Design Specific
1
Cover Hole Lead in Depth Design Specific
1
Design Specific
1
Design Specific
1
Contact Gap Design Specific Design Specific Design Specific
Contact True Position Design Specific Design Specific Design Specific
Contact Inner Loop TP Design Specific Design Specific Design Specific
Contact Pin Acceptance Inscribed Circle Design Specific Design Specific Design Specific
Contact Angle Design Specific Design Specific Design Specific
Base Flatness Design Specific Design Specific Design Specific
Through Cavity Y (in open and closed position) 15.05 mm Design Specific
Through Cavity X (in open and closed position) 15.05 mm Design Specific
Socket overall width, including lever 41 mm
NOTES:
1. See 3.2.4 – Socket Standoff Height
Manufacturer is required to monitor these critical to function (CTF) parameters as a part of on-going Quality
Control.