The BCR 112F E6327: NPN pre-biased transistor with dual 4.7 kΩ resistors (R1 and R2) integrated. Switches loads up to 100 mA at 50 V, transition frequency 140 MHz, SOT-723 package.
Obsolete — sourcing reality
The BCR 112F E6327 carries an Obsolete lifecycle status. Sourcing is limited to surplus inventory, broker channels, and independent distribution.
Bias resistor ratio — the so-what
Both R1 (base) and R2 (base-emitter) are 4.7 kΩ, giving a 1:1 ratio. This sets the input voltage threshold at roughly half the supply when driven from a GPIO, and the 4.7 kΩ base resistor limits base current without an external part. The 100 nA collector cutoff (ICBO) means leakage is negligible at room temperature, so the output stays off when the input is low. The 300 mV saturation at 500 µA base, 10 mA collector gives a low on-state voltage drop for small-signal switching.
