5 PCS C1815 NPN Transistor

The C1815 transistor is a silicon NPN transistor widely used in audio circuits, general electronics, and research projects. It has been designed and manufactured by reputable companies such as Toshiba, and thanks to its low-noise performance, high current gain, and good thermal stability, it is one of the most popular choices for amplifying weak audio and sensor signals. The small TO-92 package and high reliability make it easy to use in various development boards, audio modules, and analog circuits.

The C1815 features a collector-emitter voltage of up to 50V (Vceo), a maximum collector current of 150mA (Ic), and a current gain (hFE) of approximately 70 to 700. These specifications make it suitable for microphone preamplifier circuits, multi-stage audio amplifiers, and low-power electronic switches. Its relatively high transition frequency of up to about 80MHz (fT) also makes it suitable for medium- and high-frequency circuits. This amplifier transistor turns on with a low base voltage and provides a linear, accurate response in the amplification region.

The C1815 NPN transistor is used in small electronics projects as well as professional audio systems. Typical applications include microphone amplifiers, sound detection circuits, automatic gain control (AGC) circuits, small oscillators, and light switching circuits.

C1815 NPN Application:

1. Audio amplifiers
2. Microphone preamplifier circuits
3. Oscillators and oscillator circuits
4. Low-power electronic switches
5. Detector circuits and analog sensors

C1815 Transistor Specification:

1. Type: Epitaxial silicon NPN
2. Package: TO-92
3. Collector–Emitter Voltage (Vceo): 50 V
4. Collector–Base Voltage (Vcbo): 60 V
5. Emitter–Base Voltage (Vebo): 5 V
6. Collector Current (Ic max): 150 mA
7. Power Dissipation (Pd): approx. 400 mW
8. DC Current Gain (hFE): ~70 to ~700 (depending on conditions)
9. Transition Frequency (fT): approx. 80 MHz
10. Operating / Storage Temperature: −55°C to +150°C

Documents:

C1815 Transistor Datasheet