What this NPN pre-biased transistor does
The Infineon BCR108WH6327XTSA1 is an NPN pre-biased transistor in a SC-70 SOT-323 surface-mount package. It integrates a 2.2 kΩ base resistor (R1) and a 47 kΩ emitter-base resistor (R2), eliminating two external passives per channel in switching and driver applications. Collector-emitter breakdown is rated 50 V, continuous collector current 100 mA, and the transition frequency reaches 170 MHz. Maximum power dissipation is 250 mW. This part is commonly used in low-side switching, relay drivers, and logic-level interface circuits where board space is tight.
Last Buy — what it means for procurement
Infineon lists the BCR108WH6327XTSA1 with a Last Buy lifecycle status. This is the final procurement window before the part is discontinued. Buyers filling a BOM line should secure stock now or qualify a replacement before the last-time-buy expires.
Integrated bias resistors simplify the bill of materials
The on-die R1 (2.2 kΩ) and R2 (47 kΩ) set the base drive and turn-off path without external resistors. This saves board area and reduces component count in high-density designs. The pre-biased configuration also tightens the input threshold spread compared to a discrete transistor plus two resistors, which matters when driving loads from a logic output with limited voltage swing.