Component Trace, 2 oz *1.60 mm* = finish thickness: 2 oz/ft2 = 70 mFigure 1a — Cross section of 1s PCB showing trace and dielectric thicknesses in package placement and trace fan-out regions A1.60 mmA Component Trace, 2 oz *Plane 1, 1 oz, solidPlane 2, 1 oz, solidBackside Trace, 2 oz * 0.25 mm A 0.5 mm * = finish thickness: 1 oz/ft2 = 35 m 2 oz/ft2 = 70 mFigure 1b — Cross section of 2s2p PCB showing trace and dielectric thicknesses JEDEC Standard No. 51-9Page 34 Board outline The board shall be 101.5 mm x 114.5 mm +/- 0.25 mm in size for packages less than or equal to 40 mm on a side (see figure 2). A typical edge connector is depicted in figure 2. The edge connector can be pin- out and pitch modified for specific needs. Modification of the width dimension of the edge connector is allowed. Multiple rows of vias along the edge connector are allowed.For various package sizes, refer to table 1 for the appropriate PCB size.Table 1 — PCB sizes for packagesPackage Length PCB Size (+/- 0.25 mm)Pkg. Length 40 mm 101.5 mm x 114.5 mm (4.0 in x 4.5in)40 mm < Pkg. Length 65 mm 127.0 mm x 139.5 mm (5.0 in x 5.5 in)65 mm < Pkg. Length 90 mm 152.5 mm x 165.0 mm (6.0 in x 6.5 in)Figure 2 — BGA test board outer dimensions and edge connector design. JEDEC Standard No. 51-9 Page 45 Trace design 5.1 Top trace layer layout (both 1s and 2s2p PCBs)Traces shall be laid out such that the test device will be centered relative to a 101.5 mm x 101.5 mm section towards the top of the board (away from the edge connector) for the smallest board. For larger board sizes, locate the package at the top of the board in the center of a square whose length is the width dimension of the board. The traces connecting to the package must extend at least 25 mm out from the edge of the device body. Trace lengths longer than this amount are allowed. Traces must be routed in a radial fashion (flared) to meet the edges of a square such that the terminal via locations are equally spaced over 90% of the perimeter of the sides of this square. Lands must be flared out to the 25 mm perimeter adjacent to the side of the package they are on. Corner-most lands flare to the perimeter clockwise of the corner (see figures 3 & 4). Staggering of trace terminal soldering positions inward from the trace termination square is allowed to 2.5 mm off the perimeter of the square.Figure 3 — Traces to outer ball row flared to perimeter 25 mm from package body.