BC817-40QAZ

BC817-40QAZ is a general-purpose NPN bipolar junction transistor in a SOT-23 package, part of the BC817 family. It’s designed for low‑power switching and amplification in compact electronics. The “40” denotes a gain group within the BC817 line; the exact hFE range is specified in the datasheet. Typical ratings (depending on supplier) include Vceo around 45 V and Ic up to about 500 mA, suitable for small-signal amplification, LED drivers, and relay drivers. It’s a robust, easy‑to‑drive transistor with standard NPN behavior; common configurations are common-emitter for amplification or switching. The “QAZ” suffix is a package/lot code used by manufacturers to identify the variant and production lot (RoHS/lead-free). In design, consider base drive, saturation voltage, and hFE variation with temperature. For precise specs, consult the specific BC817-40QAZ datasheet from your supplier.

BC817-40 is a general‑purpose NPN. Common equivalents include 2N2222A / MMBT2222A, 2N3904 / MMBT3904, BC337, and BC547 (depending on current/Vce needs). SMD equivalents: MMBT3904, MMBT2222A. Also other BC817 family bins (BC817-25, -63). Always verify pinout, Vce, Ic and hFE before substitution.

BC817-40QAZ is a general‑purpose NPN transistor. Key features:
- Type: NPN bipolar transistor
- Vceo: 45 V
- Ic max: ~0.8 A (continuous)
- Gain: high-gain subgroup of the BC817 family (suitable for amplification and switching)
- Package: SMD (SOT‑23); marking code QAZ
- RoHS / Pb‑free
- Applications: general switching and small-signal amplification in consumer, automotive, and similar electronics
Note: exact hFE varies with Ic and temperature (the “-40” suffix indicates a specific gain group within the BC817 family).

- Pin count: 3 (SMD transistor in a SOT-23 package)
- Function: General‑purpose NPN small‑signal transistor used for switching and amplification (BC817 family, gain group ~40, i.e., hFE ≈ 40–160).

Manufacturer: Nexperia.
What kind of company: Nexperia is a global semiconductor company that designs and manufactures discrete components, including transistors (like BC817), diodes, and other small-signal devices for automotive, industrial, consumer, and communications markets.

BC817-40QAZ is a general-purpose NPN transistor (SOT-23). Typical application areas:
- Low-power switching and amplification in consumer electronics
- Relay/solenoid drivers and LED indicators
- Sensor interfaces and signal buffering
- Microcontroller I/O interfacing and level shifting
- Automotive and industrial control within its voltage/current ratings
(Useful specs: Vceo ~ 45V, Ic up to ~500 mA; suitable for small-signal and switching tasks.)

SOT-23, a 3-pin surface-mount package.