The C1815 and C945 are both widely used bipolar junction transistors (BJTs) typically employed in low-power amplifier and switching applications. While they share some similarities, there are important differences between them. Let's discuss the distinctions and make a comparison between the C1815 and C945:
C1815: The C1815 is an NPN (Negative-Positive-Negative) transistor. Here are some key characteristics of the C1815:
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Maximum Collector Current (IC): The C1815 is typically rated for a maximum collector current of 150 mA (milliamperes). This current rating indicates the maximum current that can flow through the transistor's collector terminal while maintaining proper operation.
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Maximum Collector-Emitter Voltage (VCEO): The C1815 typically has a maximum collector-emitter voltage rating of 50 volts. It is important to ensure that the voltage across the collector-emitter junction does not exceed this rating to avoid damaging the transistor.
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Current Gain (hFE or β): The current gain, also known as the DC current gain or beta (β), typically ranges between 70 and 700 for the C1815 transistor. This parameter specifies the amplification capability of the transistor and can vary from unit to unit.
Ratings & Characteristics Comparison:
| Ratings & Characteristics | C1815 | C945 |
|---|---|---|
| Collector-Emitter Voltage (Vceo) | 50V | 50V |
| Collector Current (Ic) | 150mA | 150mA |
| Total Device Dissipation (PD) | 400mW | 400mW |
| DC Current Gain (hFE) | 70 To 700 | 70 To 700 |
| Frequency (fT) | 80 MHz | 300 MHz |
C945: The C945 is also an NPN transistor, commonly used in low-power audio and switching applications. Here are some important characteristics of the C945:
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Maximum Collector Current (IC): The C945 has a maximum collector current rating of 150 mA, which is identical to that of the C1815.
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Maximum Collector-Emitter Voltage (VCEO): The C945 typically has a maximum collector-emitter voltage rating of 60 volts, slightly higher than the C1815.
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Current Gain (hFE or β): The current gain of the C945 transistor typically ranges between 70 and 700, similar to the C1815.
Comparison: In terms of maximum collector current, current gain, and transistor type (both NPN), the C1815 and C945 are quite similar. However, the main difference lies in their maximum collector-emitter voltage ratings, where the C945 has a slightly higher rating of 60 volts compared to the C1815's 50 volts.
It's important to note that although they have similar electrical characteristics, the C1815 and C945 are not directly interchangeable in all applications. The specific requirements of the circuit, including voltage, current, and gain, must be carefully considered when selecting the appropriate transistor.
When substituting one transistor for another, it is recommended to consult the datasheets and manufacturer guidelines to ensure compatibility and proper operation within the intended application.
