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

Intel® Pentium® 4 Processor 478-Pin Socket (mPGA478)

3.14. Assembly Requirements to the Motherboard

3.14.1. Surface Mountable

The socket must be a surface mount socket design.

3.14.2. Reflow Characteristics

Max Temperature: 240°C

Figure 3-1. Typical Reflow Profile for 63Sn/37Pb solder

3.14.3. Shipping/Handling:

Shipping/Handling media needs to support high volume manufacturing.

3.15. Critical To Function Dimensions:

The socket shall accept a 478-pin package pin field. All dimensions are metric; English units are shown for

reference only. mPGA478 Socket dimensions are shown in Section 8 – Appendix Z.2.

Each of the dimensions must meet the requirements given in Table 3-1 – Socket Critical to Function

Dimensions. These dimensions will be verified as part of the validation process. Also, supplier will provide

and maintain Critical Process Parameters controlling these CTFs or will provide direct measurements to meet

ongoing quality requirements.

Note: If for any reason there is a conflict between this table and the drawing, the drawing is correct.

Table 3-1. Socket Critical to Function Dimensions

Dimension Minimum Nominal Maximum

Socket height beneath package

(post reflow, from contact surface to motherboard )

3.8 mm 4.0 mm 4.2 mm