Impact of VLSI technology scaling on HTOL

High Temperature Operating Life (HTOL) is a standard stress used in IC product qualification. With VLSI technology scaling, gate dielectric TDDB models have higher acceleration factors leading to an increase in predicted HTOL failure, particularly with the transition to high-k gate dielectrics. However, cumulative end-of-life field failures remain substantially unchanged from previous technologies. A calculator tool which comprehends both field and HTOL failure modeling illustrates the trend and guides product qualification expectations.