Pre-biased NPN — what it replaces
The Infineon BCR 139F E6327 is an NPN pre-biased transistor in a SOT-723 surface-mount package. The 22 kOhms base resistor (R1) is integrated, so it switches on with about 5 V on the base pin — no external bias network needed. Collector current is rated 100 mA max, Vce breakdown at 50 V, and transition frequency hits 150 MHz.
Obsolete — sourcing the line
Infineon lists the BCR 139F as Obsolete.
Package and footprint fit
Supplied in Tape & Reel (TR), surface-mount to a SOT-723 footprint. The supplier device package is PG-TSFP-3 — three leads, no exposed pad. At 250 mW max power, thermal management is straightforward for low-current switching up to 100 mA.
