BC856B-QR

BC856B-QR is a small-signal PNP transistor in a surface-mount SOT-23 package. It’s the PNP counterpart of BC846 and part of the BC856 family, used for low-power amplification and switching. The B suffix indicates the gain group (mid-high hFE) and QR denotes RoHS-compliant, tape-and-reel packaging for automated assembly. Typical electrical: Vceo in the tens of volts (vendor variants around 65 V), Ic up to ~100 mA, and relatively high gain at small collector currents. The device is suitable for signal amplification, high-side switching, and level shifting in consumer electronics and instrumentation. Pinout for SOT-23: pin 1 emitter, pin 2 base, pin 3 collector. When using, observe reverse polarity (emitter toward the positive rail for PNP), and bias with an appropriate base resistor to limit base current. For exact values and packaging details, consult the specific BC856B-QR datasheet from the supplier.

Equivalents (PNP small-signal transistors in SOT-23 or similar):
- BC856B (same family from other vendors: NXP, Onsemi, Vishay, etc.)
- BC856A / BC856C (same device family, different gain)
- BC857B (PNP with similar ratings)
- MMBT3906 (SOT‑23, 40 V, 0.2 A)
- 2N3906 (through-hole, for non-SMD use)
Note: match pinout and gain class (A/B/C) for your circuit.

BC856B-QR features:
- PNP, general-purpose small-signal transistor
- SOT-23 package (3-pin), marking QR
- Vceo = 45 V; Ic max ≈ 100 mA
- DC current gain hFE (B grade): ~200–450 (typical ~300) at Ic ≈ 2 mA
- Low-noise, suitable for audio, small-signal amplification and switching
- Fast switching capability
- Complement to BC846 (NPN)
- Temperature range: −55°C to +150°C
- Pb-free, RoHS compliant; available in tape‑and‑reel (QR) packaging

- Pin count: 3
- Function: PNP bipolar junction transistor (general-purpose) in SOT-23 packaging; used for amplification and switching
- Pinout (viewing the flat face): Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector

- Manufacturer: Nexperia
- Company type: Global semiconductor company that designs and manufactures discrete components (transistors like BC856) and related devices (diodes, MOSFETs, small-signal ICs) for automotive, industrial, consumer, and communications markets.

BC856B-QR is a general-purpose PNP transistor in a small SOT-23 package. Typical application areas:
- Small-signal amplification and buffering
- Emitter-follower and impedance-matching stages
- High-side switching and pull-up in logic/microcontroller interfaces
- Signal conditioning for sensors and audio preamps
- Complementary pair with BC846/BC856 for compact push-pull output stages
Suitable for compact, low-noise analog/digital circuits in consumer electronics.

BC856B-QR is a PNP transistor in a SOT-23 package; the “-QR” suffix indicates Tape & Reel (reel) packaging.