PCN – Product Change Notice PCN #: WE080710FE375 Date: July 11, 2008 RE: PFC FrontEnd To Our Valued Customers We appreciate your use of Westcor’s PFC FrontEnd. This notice is to inform you of a change in product performance PCN Type: Notice of a change in product performance Product(s) Affected: PFC FrontEnd Proposed Change: The nominal output voltage of the unit will change from 375V (+/- 3%) to 384V (+/-3%) . Reason(s) for the Change: This will align the output voltage to match up exactly with the 384V input BCM product line Customer impact: Better performance with the 384V series BCM. No impact with existing compatible VI/VE, V375 series modules, compatible MegaMods or ViPAC Arrays Product Traceability and Transition dates Model # FE375 will be discontinued and replaced with FE375-1. This will be effective for all new orders placed after July 15, 2008 Effective date of change: July 15, 2008 Company Contact: Jeff Lally Westcor Marketing Westcor Division of Vicor 560 Oakmead Parkway Sunnyvale, Ca. 94085-4022 [email protected] Vicor Corporation 25 Frontage Road, Andover Ma. 01810, Tel: (978) 470-2900, FAX: (978) 475-6715 Vicor Item No: FM-22054 Rev. A