BFX34

The BFX34 is a silicon NPN epitaxial planar transistor manufactured by STMicroelectronics, housed in a Jedec TO-39 metal case. It is designed for high current applications requiring low saturation voltage and high speed. Key electrical specifications include a maximum collector-emitter voltage (VCEO) of 60V, collector-base voltage (VCBO) of 120V, and emitter-base voltage (VEBO) of 6V. The continuous collector current is rated at 5A, with a total power dissipation of 5W at case temperature ≤25°C and 870mW at ambient temperature ≤25°C. The DC current gain (hFE) is typically 100 at IC=1.5A and VCE=0.6V, with a minimum of 40 at IC=2A and VCE=2V. The collector-emitter saturation voltage is typically 0.4V and maximum 1V at IC=5A and IB=0.5A. The transition frequency (fT) is typically 100MHz at IC=0.5A and VCE=5V. The device also features low collector-base capacitance (100pF max) and fast switching times (turn-on and turn-off times typically 0.25µs and 0.6µs respectively). The BFX34 is suitable for power drivers, power amplifiers, switching power supplies, and relay drivers. It operates over a storage temperature range of -65°C to 200°C with a maximum junction temperature of 200°C.