BC857CW

BC857CW is a small-signal PNP transistor from the BC857 family, designed for general switching and amplification in surface‑mount (SMD) designs. The “C” grade indicates high current gain. It is the PNP complement to BC807/BC817 and is used for buffering, level shifting, and signal amplification in compact circuits.
Key specs (typical, varies by lot): Vceo ≈ -45 V, Ic max ≈ 100 mA, low noise, and hFE in the higher range for grade C (roughly hundreds). Recommended for low-power switching and amplification at modest currents, with a common-emitter gain at low frequencies. Package is an SMD type (often SOT‑23 or similar) and pinout is device/package dependent—check the datasheet for the exact E–B–C arrangement.
Operating temperature generally −55 to +150 °C. In short, BC857CW is a convenient, high-gain PNP transistor for compact, low-power signal applications.

BC857CW is a PNP general‑purpose transistor in SOT‑23. Common equivalents/crosses:
- BC857B / BC857C (same family, different gain)
- BC856B / BC856C (PNP complement in the same family)
- MMBT3906 / FMMT3906 / MMBT3906LT1 (SMD PNP substitutes)
- 2N3906 (through‑hole substitute; pinout check)
- BC857W (same device in another SMD variant)

BC857CW is a general-purpose PNP small-signal transistor in an SMD (SOT-23) package. Key features:
- Vceo: 45 V; Ic max: 100 mA
- Gain (hFE) depends on grade: C (high gain) ~420–800; A ~110–220; B ~200–450
- Low-noise, suitable for audio and signal amplification
- Complement to BC847 (NPN)
- RoHS-compliant SMD, 3-pin package (CW variant)
- Temperature range: -55°C to +125°C
- Low saturation voltage under typical drive
Applications: small-signal amplification, switching, biasing in compact, portable circuits.

3 pins. BC857CW is a PNP general-purpose transistor (complement of BC807), used for amplification and switching. In a typical SOT-23 package, pinout is: pin 1 = Emitter, pin 2 = Base, pin 3 = Collector.

- Manufacturer: Nexperia.
- What kind of company: a global semiconductor company that designs and manufactures discrete and logic components (transistors, diodes, MOSFETs, protection devices) for automotive, industrial, and consumer electronics. It originated from Philips/NXP and is now an independent company based in the Netherlands.

BC857CW is a general-purpose PNP transistor in an SOT-23 package. Common applications include:
- High-side switching of low-power loads
- Signal amplification and buffering in analog/digital circuits
- Level shifting and biasing networks
- Audio and sensor front-end preamplifiers
- Inverter/buffer stages in logic circuits
- Complementary pair with BC847 for push-pull or differential stages

BC857CW is the SMD version in a SOT-23 (SC-70-3) 3-pin package.