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BF821
+物料清單Bipolar Transistors - BJT
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製造商Nexperia
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製造商部分 #BF821
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概述
Equivalent
The BF821 is a PNP transistor. Equivalent or similar products include:
- 2N5401 (PNP, general-purpose)
- BC557 (PNP, low-power)
- 2SA1015 (PNP, high-gain)
- KSA1015 (PNP, equivalent to 2SA1015)
- MMBT5401 (SMD version of 2N5401)
Check datasheets for exact specs like voltage, current, and gain (hFE) to ensure compatibility.
- 2N5401 (PNP, general-purpose)
- BC557 (PNP, low-power)
- 2SA1015 (PNP, high-gain)
- KSA1015 (PNP, equivalent to 2SA1015)
- MMBT5401 (SMD version of 2N5401)
Check datasheets for exact specs like voltage, current, and gain (hFE) to ensure compatibility.
Application
The BF821 is a general-purpose NPN transistor commonly used in:
1. Amplification – Small-signal amplification in audio and RF circuits.
2. Switching – On/off control in digital and power circuits.
3. Driver Stages – Driving relays, LEDs, or other transistors.
4. Oscillators – Signal generation in RF and timing circuits.
5. Consumer Electronics – TVs, radios, and small appliances.
It operates at moderate frequencies and power levels, making it suitable for low-voltage applications.
1. Amplification – Small-signal amplification in audio and RF circuits.
2. Switching – On/off control in digital and power circuits.
3. Driver Stages – Driving relays, LEDs, or other transistors.
4. Oscillators – Signal generation in RF and timing circuits.
5. Consumer Electronics – TVs, radios, and small appliances.
It operates at moderate frequencies and power levels, making it suitable for low-voltage applications.
Package
The BF821 is a general-purpose NPN transistor typically available in a TO-92 package, a common through-hole plastic casing with three leads. It is compact, cost-effective, and widely used in low-power amplification and switching applications. The TO-92 package is suitable for prototyping and small-scale circuits. For exact specifications, always refer to the manufacturer's datasheet.
