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SOLDER MASK PER ANSI/IPC-SM-840

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SMTA-64387182

#88013

SOLDER MASK PER ANSI/IPC-SM-840 | 27 May, 2022

On my PCB fab drawings, I specify SOLDER MASK PER ANSI/IPC-SM-840, should I specify a CLASS rating?

It appears at one time the CLASSES were 1, 2, or, 3. I believe, they are now T or H. Correct?

Thanks, Joe

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#88015

SOLDER MASK PER ANSI/IPC-SM-840 | 27 May, 2022

Correct. Older IPC documents refer to Class 1, Class 2, and Class 3. Class 1 => No solder mask; Class 2 => Class T; Class 3 => Class H.

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SMTA-64387182

#88021

SOLDER MASK PER ANSI/IPC-SM-840 | 27 May, 2022

Thanks for confirming.

Joe

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