Device identity and key parametrics
The BC 846B B5003 is a general-purpose NPN bipolar junction transistor in a surface-mount SOT-23-3 package (TO-236-3 / SC-59). It is part of the BC 846 series, with the B suffix denoting a tighter DC current gain bin. Key ratings include a collector-emitter breakdown voltage of 65 V, a maximum collector current of 100 mA, and a power dissipation limit of 330 mW. The minimum DC current gain (hFE) is 200 at 2 mA collector current and 5 V VCE, and the transition frequency (fT) is 250 MHz.
Lifecycle status and sourcing reality
The BC 846B B5003 is listed as obsolete by the manufacturer. No official replacement or successor order code is provided in the manufacturer's lifecycle data.
The 65 V V(BR)CEO provides margin for supply rails. The 100 mA continuous collector current suits low-power switching. The minimum hFE of 200 at 2 mA means the base drive requirement is relatively low for a given collector current, simplifying the drive circuit design. The 250 MHz fT supports analog amplification up to VHF frequencies and fast switching in low-power converters. The SOT-23-3 footprint is a standard small-signal package. The 330 mW power limit must be derated for ambient temperature.