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US 10,375,826 B2Granted
High temperature drilling electronics
AssigneeChina Petroleum & Chemical Corporation
InventorsSheng Zhan, Jinhai Zhao, Fengtao Hu, Herong Zheng
Life of this patent
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Abstract
A printed circuit board assembly (PCBA) for downhole applications has a printed circuit board (PCB) and a plurality of electronic components installed on the PCB. The PCB comprises a polyimide substrate, a lead-free surface finish, a plurality of traces, a plurality of surface mount pads, and a plurality of VIAs. The ratio between the width of one of the plurality of surface mount pads to the width of the trace connected thereto is 2 or less.
Claims13
A printed circuit board assembly (PCBA) for downhole applications, comprising:
- a printed circuit board (PCB) and a plurality of electronic components installed on the PCB;
- wherein the PCB comprises a polyimide substrate, a lead-free surface finish, a plurality of traces, a plurality of surface mount pads, and a plurality of VIAs, and
- wherein a ratio between a width of one of the plurality of surface mount pads to a width of the trace connected thereto is 2 or less,
- wherein X/Y ranges from 0.8 to about 0.86, wherein X is a minimum trace width of the plurality of traces and Y is the minimum spacing between the two adjacent traces amongst the plurality of traces.
1 more element
Dependencies are inferred from the claim text.