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Technology Stocks : General Lithography
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To: Ian@SI who wrote (1080)7/20/1998 12:11:00 AM
From: Katherine Derbyshire  Read Replies (2) of 1305
 
The mask lifetime question has actually come up before, either here or in one of the mask house threads. This time, I have an answer. (From SVG's John Shamaly)

DRAM houses get ~5-10,000 wafers/reticle
logic houses get ~3-4,000 wafers/reticle
ASIC houses get ~25 wafers/reticle.

So this probably puts the physical lifetime of the mask at in the neighborhood of 10,000 wafers+. 30,000 wafer starts/month is a large fab.

Non-optical lithography techniques may have different numbers. Mask lifetime is a particular concern with x-ray lithography.

Katherine
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