NPN pre-biased transistor with integrated 4.7 kOhm base resistor
The Infineon BCR 119 E6433 is an NPN pre-biased transistor in a SOT-23-3 surface-mount package. The integrated 4.7 kOhm base resistor (R1) eliminates one external component per switching node, simplifying board layout and reducing pick-and-place cost. It is designed for low-current switching and interface applications where a single transistor with a defined base drive is needed — common in relay drivers, logic-level translators, and small-signal amplification stages in industrial and consumer electronics.
The 50 V collector-emitter breakdown voltage (VCEO) comfortably handles 24 V and 48 V industrial supply rails with margin. The 100 mA maximum collector current (IC) suits driving small relays, LEDs, or logic inputs — not power loads. The 150 MHz transition frequency (fT) is adequate for switching up to several megahertz, though the pre-biased nature limits the switching speed compared to a discrete transistor with a tailored base drive.
The BCR 119 E6433 is listed as obsolete by Infineon. No official successor order code appears in the available records.