WLCSP-25(2.59x2.59) routing (WLCSP-25(2.59x2.59) C1851939

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35*******8A

2023-02-23 00:36 AM

I'm trying to route WLCSP-25(2.59x2.59) routing (WLCSP-25(2.59x2.59) C1851939 in a four layer board. Capabilities pages say I could use a 0.09mm trace width but must maintain a .127 clearance for PCBA. How should I measure the .127 clearance? From the edge of the pad, the solder mask expansion or from the center of the pad?

JLCPCB

2023-03-21 20:03 PM

The .127 clearance is from the solder mask expansion to the trace.