sche Stromsteilheit critical rate of rise of on-state current DIN IEC 747-6 (di/dt)cr f = 50Hz, iGM = 0,6A, diG/dt = 0,6A/µs Kritische Spannungssteilheit critical rate of rise of off-state voltage Tvj = Tvj max, vD = 0,67 VDRM 8. Kennbuchstabe / 8th letter F (dv/dt)cr Charakteristische Werte .