The C1815 and BC547 are both popular NPN bipolar junction transistors (BJTs) commonly used in low-power amplification and switching applications. While they have some similarities, there are notable differences between the C1815 and BC547. Let's explore these differences:
C1815: The C1815 is an NPN transistor with the following characteristics:
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Maximum Collector Current (IC): The C1815 is typically rated for a maximum collector current of 150 mA (milliamperes). This rating determines the maximum current allowed to flow through the transistor's collector terminal without causing damage.
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Maximum Collector-Emitter Voltage (VCEO): The C1815 generally has a maximum collector-emitter voltage rating of 50 volts. It is crucial to ensure that the voltage across the collector-emitter junction does not exceed this limit to prevent potential transistor failure.
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Current Gain (hFE or β): The current gain of the C1815 transistor typically ranges from 70 to 700. This parameter denotes the amplification capability of the transistor, representing the ratio of the collector current (IC) to the base current (IB).
BC547: The BC547, on the other hand, is also an NPN transistor with its own characteristics:
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Maximum Collector Current (IC): The BC547 has a maximum collector current rating of 100 mA, which is slightly lower than the C1815.
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Maximum Collector-Emitter Voltage (VCEO): The BC547 typically has a maximum collector-emitter voltage rating of 45 volts, slightly lower than the C1815.
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Current Gain (hFE or β): The current gain of the BC547 transistor ranges from 110 to 800, providing similar amplification capability as the C1815.
Ratings & Characteristics Comparison:
| Ratings & Characteristics | C1815 | BC547 |
|---|---|---|
| Collector-Emitter Voltage (Vceo) | 50V | 45V |
| Collector Current (Ic) | 150mA | 100mA |
| Total Device Dissipation (PD) | 400mW | 625mW |
| DC Current Gain (hFE) | 70 To 700 | 110 To 800 |
| Frequency (fT) | 80 MHz | 300 MHz |
Differences:
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Maximum Collector Current: The C1815 has a higher maximum collector current rating of 150 mA, while the BC547 is limited to 100 mA. This means the C1815 can handle higher current levels.
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Maximum Collector-Emitter Voltage: The C1815 has a higher maximum collector-emitter voltage rating of 50 volts compared to the BC547's 45 volts. The C1815 can handle slightly higher voltage levels.
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Pin Configuration: The pin configuration of the C1815 and BC547 is different, so they are not pin-to-pin compatible. Pin assignments for each transistor should be referenced from their respective datasheets when designing or replacing them in a circuit.
It is important to consider these differences, especially when selecting a specific transistor for a particular application. While they have similar applications, the varying current and voltage ratings could affect their suitability and performance in different circuits.
Always consult the datasheets provided by the transistor manufacturers to ensure compatibility and adherence to the required specifications of your circuit.
