NPN transistor BUL39D, 4A, TO-220, TO-220, 450V. Collector current: 4A. Housing: TO-220. Housing (according to data sheet): TO-220. Collector/emitter voltage Vceo: 450V. Assembly/installation: PCB through-hole mounting. Darlington transistor?: no. Function: Fast commutation for switching mode power supply. Ic(pulse): 8A. Max hFE gain: 10. Minimum hFE gain: 4. Number of terminals: 3. Pd (Power Dissipation, Max): 70W. Quantity per case: 1. RoHS: yes. Saturation voltage VCE(sat): 0.13V. Semiconductor material: silicon. Spec info: IFMS 8A, tp <5 ms. Temperature: +150°C. Tf(max): 100 ns. Tf(min): 50 ns. Type of transistor: NPN. Vcbo: 850V. Vebo: 9V. Original product from manufacturer: Stmicroelectronics. Quantity in stock updated on 11/07/2025, 22:43