BC817-40-7-F

BC817-40-7-F is a variant of the BC817 family — a general-purpose NPN transistor used for small-signal amplification and switching in low-power circuits. The '-40-' and '-7-' parts are vendor-specific suffixes that designate a particular current-gain (hFE) group, packaging, and RoHS (lead-free) status; 'F' usually indicates RoHS compliance. As a general spec, BC817 devices tolerate up to about 45 V collector–emitter voltage and about 500 mA collector current, with a small-signal power rating around 625 mW. The actual hFE and leakage depend on the exact lot and operating conditions. The BC817 family covers a wide hFE range, so the -40 variant is one of several gain groups. Applications include general-purpose amplification, switch drivers, sensor interfaces, and small signal paths in consumer electronics. For precise values (Vceo, Ic, hFE, Vce(sat), etc.), refer to the datasheet for the exact BC817-40-7-F revision from the manufacturer or distributor.

BC817-40 is an NPN small‑signal transistor (Vce ≈45 V). Direct or common substitutes:
- BC817 (other gain groups: -16, -25)
- BC337
- 2N2222A / PN2222A
- 2N3904 / MMBT3904 (SMD)
- BC547 (voltage similar; lower Ic)
Verify pinout, collector current, hFE (gain group) and package before substituting.

BC817-40-7-F features (general-purp NPN transistor in SOT-23):
- NPN transistor, general-purpose switch/amp
- Vceo: 45 V; Ic max: 500 mA
- High gain (hFE) variant-dependent (BC817 family typically broad gain, ~100–800)
- Low Vce(sat) at moderate base drive (roughly 0.2–0.4 V)
- Surface-mount in SOT-23 package; RoHS-compliant / Pb-free
- Wide operating temperature: roughly -55°C to +150°C
- Suitable for switching and amplification; compatible with BC807 (complement) for push-pull pairs
Note: Exact hFE and parameters vary by the “-40” variant; refer to the datasheet for precise curves.

- Pin count: 3 pins
- Function: General-purpose NPN bipolar transistor (SOT-23 package, BC817 series), used for amplification and switching.

Manufacturer: Nexperia.
What kind of company: Nexperia is a global semiconductor company that designs and manufactures discrete components (such as transistors and diodes), logic and analog devices, and other related semiconductors. It was created as a spin-off from NXP and is headquartered in the Netherlands, with operations worldwide.

BC817-40-7-F is a general‑purpose NPN transistor for low‑power signal amplification and switching. Typical applications:
- Small‑signal stages and driver circuits in consumer, automotive, and industrial electronics
- Buffering and level shifting between microcontrollers and higher‑current loads
- LED/relay driving, digital logic switching, and regulator/driver stages
- Sensor signal conditioning and audio pre‑amps
Specs (variant dependent): Vce up to ~45 V, Ic up to ~0.5 A; RoHS lead‑free (-F); commonly in SOT‑23/SMD packages. Choose for moderate gain and switching speed.

TO-92 through-hole package (lead-free, RoHS-compliant version).