BSENIEC63378-3:2025 BSl Standards Publication Thermal standardization on semiconductor packages Part 3: Thermal circuit simulation models of discrete semiconductorpackagesfortransientanalysis bsi. BSENIEC63378-3:2025 BRITISH STANDARD National foreword ThisBritish StandardistheUK implementation of ENIEC63378-3:2025. Itis identicaltoIEC63378-3:2025. The UK participation in its preparation was entrusted to Technical Committee EPL/47, Semiconductors. request to its committee manager. Contractualand legalconsiderations This publication has been prepared in goodfaith, however no representation,warranty,assuranceorundertaking (express or implied) is or will be made, and no responsibility or liability is or will be liability is expresslydisclaimedtothefull extentpermittedbythelaw Thispublication is provided as is,and is to be used at the recipient's own risk. The recipient is advised to consider seeking professional guidance with respect to its use of this publication. This publication is not intended to constitute a contract. Users are responsibleforitscorrectapplication. @TheBritishStandardsInstitution2025 PublishedbyBSIStandards Limited2025 ISBN9780539191639 ICS31.080.01 Compliance witha British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the StandardsPolicyandStrategyCommitteeon30June2025. Amendments/corrigendaissued sincepublication Date Text affected BSENIEC63378-3:2025 EN IEC 63378-3 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM June2025 ICS 31.080.01 English Version Thermal standardization on semiconductor packages - Part 3: Thermal circuitsimulation models of discretesemiconductor packagesfortransientanalysis (IEC63378-3:2025) Normalisation thermique des boitiers de semiconducteurs - Thermische Standardisierung von Halbleitergehausen-Teil Partie 3: Modeles de simulation de circuits thermiques de 3: Thermische Schaltungssimulationsmodelle von diskreten boitiers de semiconducteurs discrets pour analyse Halbleitergehausen fur die Transientenanalyse transitoire (IEC 63378-3:2025) (IEC 63378-3:2025) This European Standard was approved by CENELEC on 2025-06-10. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland Turkiye and the United Kingdom. CENELEC European Committeefor Electrotechnical Standardization ComiteEuropeendeNormalisationElectrotechnique Europaisches Komitee fur Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN IEC 63378-3:2025 E BSENIEC63378-3:2025 ENIEC63378-3:2025(E) European foreword CENELECparallelvoteandapprovedbyCENELECasENIEC63378-3:2025. The following dates are fixed: latest date by which the document has to be implemented at national (dop) 2026-06-30 level by publication of an identical national standard or by endorsement latest date by which the national standards conflicting