Product Change Notice

1233Product Change NoticePCN #: BE100315 Date: March 15, 2010Re: V375A54 Maxi ModulesTo Our Valued Customers:We appreciate your use of Vicor DC-DC converters. The purpose of this notice is to inform youof a change in product performance.PCN Type:Notice of a product performance parameter change.Product(s) Affected:All DC-DC converter model numbers beginning with V375A54 (e.g. V375A54C600BL).Proposed Change:Operating frequencies of the converter will be reduced from 630kHz to 537kHz at nominal line,full load. Other line and load conditions will also see reductions in operating frequency.Reason(s) for the Change:Long term component availability and improved reliability.Customer Impact:Customers using the module in single module applications will see no material difference in theperformance of the newer design. All published specs, such as efficiency and ripple will bewithin normal specification limits.Applications requiring paralleling of modules for increased power or N+M redundancy will beaffected. The newer design will NOT current share with older versions. The different designsmust not be mixed in a parallel array. When replacing a failed module in an array, the modulesmust all be of the same design.Product traceability and transitionTo determine the design version of a module, please refer to the serial number just below thepart number. Modules with serial numbers greater than 01100321000000 are the new versionsand will not be compatible with modules that have a lower serial number.Effective date of change: Modules manufactured after March 21, 2010.Reliability/qualification summaryThe new design has been subjected to and passed an exhaustive series of electrical andreliability tests that are standard for the Maxi product series. Reliability is projected to equal orexceed that of the previous design.Company Contact:Applications EngineeringVicor Corporation25 Frontage Road

1233Andover, MA 01810apps@vicorpower.com