JEDEC Standard No. 51-10 Page 85 Trace design (cont’d)5.7 PCB metalization characteristics for 1s and 2s2p PCBsTop and bottom trace metalization on the PCB should be 70m (2 oz) +/-20% finished thickness. This is achieved by starting with a 1 oz copper material and plating to 2 oz during PCB through hole plating process. This process specification should be printed on all drawings to insure proper processing. The thickness of the copper traces should be verified to +/- 20% after PCB fabrication because thickness variations greater than this can have an excessive influence on the performance of the PCB.5.8 Solder masks for 1s and 2s2p PCBsSolder masking is required and must follow the constraints described for the pads in 5.3.6 Hand wiring Connection to edge connector: Connection from the through-holes to the edge connector shall be made with 22AWG copper wire or smaller if the connections are not designed as part of the trace pattern.When the board is intended for use in forced air measurement environments, interconnect wiring to the edge connector shall be on the trailing edge of the board with respect to air flow direction and back side of the board with respect to the component placement. Interconnect wiring shall be outside the fan-out area. Figure 6 shows a suggestion for wiring from the leading edge of the test board to the trailing edge before being routed to the edge connector. Connection from the edge connector to the fan-out perimeter and from the fan-out perimeter to the power dissipation structures must be made in a four-point method for force (power) and sense (measure) purposes. Wire diameters for heating force currents may need to be larger to accommodate high power tests and may require more than one edge connector pin. Use table 3 as a guide to determine the required wire diameter [5,6].Table 3 — Wire size current limitsAWG Wire Size UL Current Capacity, (80 ºC), Amperes MIL-W-5088BAmperes30 0.4 N/A28 0.6 N/A26 1.0 N/A24 1.6 N/A22 2.5 5.020 4.0 8.318 6.0 15.416 10.0 19.414 16.0 31.212 26.0 40.0 JEDEC Standard No. 51-10Page 96 Hand wiring (cont’d)Air Flow DirectionFigure 6 — Dashed lines show hand wiring across back of test board to avoid interrupting air flow on leading edge of board for air flow measurement environments. JEDEC Standard No. 51-10 Page 107 Data presentation Table 4 lists parameters specified by this document. The “user” column allows the user to input actual measured values from the test boards.Table 4 — Specified parameters and values used Dimension Specification User1 Board Finish Thickness 1.60 mm +/- 10% 2 Board Dimension (+/- 0.25 mm) 101.5 mm x 114.5 mm [PKG 40 mm]127.0 mm x 139.5 mm [40 < PKG 65 mm]152.5 mm x 165.0 mm [65 < PKG 90 mm] 3 Board Material FR-4 4 Dielectric Layer Thickness 0.25 mm thickness 0.5 mm 5 Fan-out Trace Length from package body (minimum) 25 mm 6 Fan-out Trace Position centered in 101.5 mm x 101.5 mm section [PKG 40 mm]centered in 127.0 mm x 127.0 mm section [40 < PKG 65 mm]centered in 152.5 mm x 152.5 mm section[65 < PKG 90 mm] 7 Copper Trace Thickness 70 m +/-20% 8 Finished Trace Width 0.25 mm +/-10% 9 Trace Coverage Area (total) 10 Package Mount Via Finished Diameter Minimum = maximum pin diameter + 0.15 mm Maximum = minimum pin diameter + 0.60 mm 11 Package Mount Via Pad Diameter Nominal as specified by reference [8] 12 Package Mount Via Isolation Clearance Drill diameter + 0.2 mm minimum 13 Nested? Yes/no: package body sizes nested 14 Backside Interconnect? Yes/no 15 Multi-layer (buried pwr/gnd) Yes/no 16 Power/Ground Thickness 35 m (1oz) copper +0/-20 % 17 Power/Ground space to PCB edge 1 mm 18 Power/Ground connected to fan-out vias? Yes/no: number of connections 19 Solder Mask (required) Type 20 Number of Thermal Pins 21 Fan-out Trace Via Land 1.25 mm 22 Fan-out Trace Via Drill Hole 0.85 mm 23 Fan-out Trace Via Isolation Clearance 0.70 mm oversize of via hole; buried plane continuity assured through via regions 24 Wire Gauge (Sense) 22 AWG 25 Wire Gauge (Heater Force) See Table 3 26 Heater sense lines merged with force lines? on diein package on PWB 27 TSE sense lines merged with force lines? on diein package on PWB 28 Drawings Available? Yes/no