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The Rating of Power Transistor VCBO VCEO VCES VCER • Typically VCBO ~ VCES > VCER > VCEO (VCER resister value less than 1K), After test, VCES is close to VCBO. • If VCER resister value less than 1K, VCES ~ VCER VCER is close to VCES, After test, VCER is close to VCES. • The voltage rating is tested according to the leakage current – No IC current in this moment – VCBO can only be used in normal mode condition The Rating of Power Transistor • If customer is doubt with the rating voltage of power transistor, customer can simulation test with VCBO ,VCES , VCER , VCEO • Inside chip VCER driver sink resistor is less than 10ohm, the VCER is close to VCBO. • More and more big semi-conductor company use Vces instead of Vcbo to avoid mis-understanding. For example, above is the ST datasheet, it change the spec Vcbo to Vces.