2N3905 / Diotec Semiconductor - Folha de dados(PDF) Chat AI

2N3905 Datasheet with Chat AI

Hello, Please ask a question about 2N3905 Datasheet

# Example questions: ➢ What is the typical gain-bandwidth product (ft) for the 2n3905 and 2n3906 transistors, and what does this parameter indicate about the transistor's performance?
➢ What is the typical collector-base capacitance (ccb0) for both transistors, and how might this parameter affect the transistor's high-frequency performance in a circuit?
➢ Compare the typical hfe (current gain) values for the 2n3905 and 2n3906 transistors at a collector current of 10ma. how does the hfe change as the collector current increases to 100ma?

Part No.	2N3905
Manufacturer	DIOTEC
Size	99 Kbytes
Pages	2 pages
Description	Si-Epitaxial PlanarTransistors

Datasheet Summary with AI

Okay, here's a summary of the data provided for the 2N3905 transistor, organized by category:

1. General Characteristics:

️· These are general-purpose NPN transistors.

2. Electrical Characteristics (Key Values):

️· DC Current Gain (hFE): Ranges are given for different collector currents (IC). This is the most variable parameter.
- 0.1 mA: hFE can be as low as 30 (2N3905) or 60 (2N3906) and as high as around 150-300.
- 10 mA: hFE is significantly lower, around 50-100 (2N3905) or 30-60 (2N3906).
️· Gain-Bandwidth Product (fT):
- 2N3905: 200 MHz
- 2N3906: 250 MHz
️· Collector-Base Capacitance (CCB0): 4.5 pF
️· Emitter-Base Capacitance (CCB0): 10 pF
️· Noise Figure (F):
- 2N3905: 5 dB
- 2N3906: 4 dB
️· Switching Times:

- Turn-on Time (ton): 70 ns (example given, but other times might vary)
- Turn-off Time (toff): 300 ns (example given, but other times might vary)

3. Thermal Characteristics:

️· Thermal Resistance (RthA): 200 K/W (This value is given with the caveat that it's valid when leads are kept at a distance of 2 mm from the case.)

4. Compatibility:

️· Complementary NPN Transistors: 2N3903, 2N3904

Important Notes:

️· 2N3905 vs. 2N3906: The 2N3906 generally has slightly better high-frequency characteristics (higher fT) and slightly lower noise figure compared to the 2N3905. They otherwise share similar performance.
️· Ranges: Many parameters (especially hFE) are given as ranges. This indicates variability due to manufacturing tolerances.

1. General Characteristics:

️· These are general-purpose NPN transistors.

2. Electrical Characteristics (Key Values):

️· DC Current Gain (hFE): Ranges are given for different collector currents (IC). This is the most variable parameter.
- 0.1 mA: hFE can be as low as 30 (2N3905) or 60 (2N3906) and as high as around 150-300.
- 10 mA: hFE is significantly lower, around 50-100 (2N3905) or 30-60 (2N3906).
️· Gain-Bandwidth Product (fT):
- 2N3905: 200 MHz
- 2N3906: 250 MHz
️· Collector-Base Capacitance (CCB0): 4.5 pF
️· Emitter-Base Capacitance (CCB0): 10 pF
️· Noise Figure (F):
- 2N3905: 5 dB
- 2N3906: 4 dB
️· Switching Times:
- Turn-on Time (ton): 70 ns (example given, but other times might vary)
- Turn-off Time (toff): 300 ns (example given, but other times might vary)

3. Thermal Characteristics:

️· Thermal Resistance (RthA): 200 K/W (This value is given with the caveat that it's valid when leads are kept at a distance of 2 mm from the case.)

4. Compatibility:

️· Complementary NPN Transistors: 2N3903, 2N3904

Important Notes:

️· 2N3905 vs. 2N3906: The 2N3906 generally has slightly better high-frequency characteristics (higher fT) and slightly lower noise figure compared to the 2N3905. They otherwise share similar performance.
️· Ranges: Many parameters (especially hFE) are given as ranges. This indicates variability due to manufacturing tolerances.