PNP pre-biased in a tiny SC-75 package
The BCR 162T E6327: The Infineon BCR 162T is a PNP pre-biased transistor — it integrates the bias resistors (R1 and R2, both 4.7 kOhms) inside the same SC-75 SOT-416 package. That means you drop one component from the BOM and save board area: no external resistor pair needed for the base divider. Rated for 100 mA continuous collector current and 50 V collector-emitter breakdown, with a transition frequency of 200 MHz. The 250 mW power limit is the thermal ceiling in that tiny package — keep the ambient derating in mind if you are pushing near the limit.
What the 4.7 kOhm resistors mean on your bench
With R1 = R2 = 4.7 kOhms, the transistor turns on when the base input exceeds roughly two diode drops through the base-emitter junction plus the resistor divider. The saturation voltage is 300 mV at 500 µA base current and 10 mA collector current. Minimum DC current gain (hFE) is 20 at 5 mA collector current and 5 Vce. That is modest — the part is designed for switched operation, not linear amplification. The collector cutoff current is 100 nA max, so leakage is negligible in most low-power circuits.
SC-75 footprint: can you swap it in the field?
The SC-75 (SOT-416) package is about 1.6 x 0.8 mm — roughly half the size of an SOT-23. That is a deliberate trade-off: it saves board space but makes hand rework harder. With a fine-tip iron and tweezers, it is doable on a bench; in a parking lot with a field kit, you will want a hot-air station and some patience. The marking on the package is small — check the orientation with a loupe before soldering.