BC817-25,215

BC817 is a general‑purpose NPN transistor in a TO‑92 package, widely used for low‑ to medium‑power switching and small‑signal amplification. Key specs (typical): up to about 45 V collector–emitter voltage, up to ~500 mA collector current, and a few hundred milliwatts of dissipation. The device is similar in role to BC547/ BC847.
The suffixes -25 and -215 denote gain-bin (hFE) variants within the BC817 family. They indicate different current-gain ranges to suit different amplification needs. In other words, -25 and -215 differ mainly in how much current gain you can expect at a given collector current. The rest of the transistor’s electrical characteristics (voltage ratings, package, pinout) are the same.
Tips:
- Choose the bin that meets your required hFE at the intended Ic.
- Expect significant hFE variation with temperature and from device to device; design with base current margins.
- Use a base resistor to limit drive current and ensure safe operation within ratings.
For exact hFE ranges and mechanical specs, consult the manufacturer’s datasheet for the specific lot/bin.

BC817-25 and BC817-215 are NPN general‑purpose transistors in the BC817 family. Key features:
- Type: NPN silicon small-signal transistor
- Package: TO‑92 (through‑hole; MMBT variants exist for SMD)
- Collector–emitter voltage: Vceo ≈ 45 V
- Continuous collector current: Ic max ≈ 0.5 A
- Power dissipation: ~0.3 W (TO‑92 at 25°C; limited by package)
- Gain (hFE): the -25 and -215 denote different gain bands (lower vs higher gain variants); exact hFE depends on lot and test conditions (check datasheet for the two parts)
- Switching/Amplification: suitable for general amplification and medium-speed switching
- Other: low to moderate noise; wide use in consumer electronics, interfacing, small-signal circuits
Note: The two suffixes indicate different gain ranges within the same transistor family. For precise hFE, Vce(sat), and other parameters, consult the specific BC817-25 and BC817-215 datasheets.

BC817-25 (and BC817-215) come in the standard TO-92 plastic package.

- Pin count: 3 pins
- Function: General‑purpose NPN small‑signal transistor (used for amplification and switching in low-power circuits).

The BC817-25,215 is manufactured by Nexperia. Nexperia is a global semiconductor company (headquartered in the Netherlands) that designs and manufactures standard discrete components, MOSFETs and logic ICs—specializing in high-volume, commodity semiconductor parts spun out of NXP’s standard-products business.

BC817-25 and BC817-215 are general‑purpose NPN transistors (TO-92) with Vceo ≈ 45 V and Ic up to 500 mA. The suffix denotes different gain (hFE) grades.
Applications:
- Low‑power switching and small‑signal amplification
- Microcontroller interfacing and level shifting
- Relay/LED/solenoid drivers
- Audio preamps and buffering
- General signal amplification in consumer electronics and hobby projects

Equivalent parts to BC817-25/BC817-215 (SOT-23 NPN general purpose) include:
- BC847A/B/C
- BC846A/B/C
- MMBT3904 (and equivalents from ON Semiconductor, NXP, Diodes Inc)
- For through-hole substitutes: 2N3904
These share similar Vce, Ic, and hFE ranges; always checkDatasheet for the exact hFE grade and voltage ratings to ensure compatibility.