High Tg laminates

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What are the main advantages of moving from a 140 degree C ... - Nov 16, 1999 by

John: The 180 Tg point is a sweet spot for obtaining heat ... - Nov 17, 1999 by davef

John Holland

#8511

High Tg laminates | 16 November, 1999

What are the main advantages of moving from a 140 degree C FR4 laminate to a higher Tg laminate 180 degree C ?. Would the higher Tg laminate be less susceptable to bow and twist ?.

John Holland

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davef

#8512

Re: High Tg laminates | 17 November, 1999

John: The 180 Tg point is a sweet spot for obtaining heat resistance, cost effectivly. These high technology boards provide good thermal resistance for wire bonding, direct chip attach, and BGA mounting and rework. Since these boards are harder than 140 Tg boards, plated through holes receive less impact from solder during thermal cycling and less pad lifting and voiding.

Bismaleimide triazine (BT) are 180 Tg epoxy resins systems have a narrower process widow than "standard" 180 Tg epoxies and are used in semiconductor packaging of BGAs and MCMs.

Dave F

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