BC847B-QR

BC847B-QR is a general‑purpose NPN small-signal transistor in a SOT-23 package, part of the BC847 family (A/B/C gain grades). The QR suffix typically indicates Pb‑free, RoHS-compliant packaging in a Tape-and-Reel reel.
Key specs (typical): Vceo ~ 45 V, Ic up to 100 mA, Ptot ~ 225 mW. Gain (hFE) in the B group is roughly 200–450 (at Ic ≈ 2 mA), with low-noise performance suitable for signal amplification.
Common uses: low-power switching and amplification in consumer electronics, sensors, audio preamps, and small signal drivers.
Pinout (SOT-23): standard Emitter-Base-Collector arrangement (pins 1–2–3); verify with the exact datasheet for the manufacturer. In short, BC847B-QR is a compact, versatile transistor for general small-signal tasks.

Equivalent parts to BC847B-QR (NPN general‑purpose in SOT‑23):
- BC847B from other vendors (same device family; RoHS/QR variants just packaging).
- MMBT3904 (SOT‑23 version of 2N3904) from ON Semiconductor, Diodes Inc, Fairchild, etc.
Notes: both target about 40–45 V Vceo and ~100 mA Ic; hFE varies by group. Always verify datasheets for exact parameters when substituting.

BC847B-QR is a general-purpose NPN transistor in SOT-23 with Tape & Reel packaging. Key features:
- NPN silicon transistor
- Vceo: 45 V; Ic: up to 100 mA
- Gain (hFE): ~200–450 (BC847B, at Ic ≈ 2 mA)
- Low-noise, suitable for amplification and switching
- SOT-23 package; QR = tape & reel packaging
- Temperature range: typically -55°C to +150°C
- Power (Ptot) limited by small package (≈ a few hundred mW)
- Pb-free, RoHS compliant
Applications: general-purpose switching and low-to-medium signal amplification.

- Pin count: 3
- Function: General-purpose NPN bipolar junction transistor (SOT-23, BC847B-QR) used for switching and signal amplification.

- Manufacturer: Nexperia.
- About the company: A Dutch-based global semiconductor company specializing in discrete components (bipolar transistors like BC847, diodes, MOSFETs) and related devices. It originated from Philips/NXP and is now an independent supplier.

BC847B-QR is a general‑purpose NPN transistor (SOT‑23) for low‑power, small‑signal switching and amplification. Typical application areas:
- Low‑power switching: drive relays, LEDs, optocouplers, indicators
- Small‑signal amplification and buffering: sensor front ends, audio/instrumentation circuits
- Interface/level shifting: TTL/CMOS to higher loads in microcontroller applications
- Driver stages in portable, consumer, automotive and industrial electronics (within 45 V, 100 mA ratings)

BC847B-QR is an NPN transistor in a SOT-23 (3-pin) surface-mount package; the “-QR” suffix indicates tape-and-reel packaging.