Last Updated on October 22, 2023 by Kevin Chen
C1815 is among the widely used bipolar transistors that have been in the market for quite a long period.
These transistors were introduced into the electronics market way back in the 1980s by the Fairchild Semiconductor company.
C1815 is also classified as an NPN transistor hence suitable for use in power amplifying applications.
It is packed with numerous desirable features that make it a perfect choice for the relevant application areas.
Are you planning to buy C1815 transistors in China?
Whether it is a personal use or you just want to buy the transistor for sale, this guide will come in handy.
We are going to discuss all the relevant details that you should know about it.
C1815 Overview
Also known as 2SC1815 medium-power BJT and NPN transistor, it was accurately designed for the amplification applications.
It is a three-terminal transistor with the base, collector and emmiter terminals. The base is the control terminal, the emitter being the input terminal and the collector being the output terminal.
The transistor has a defined operating of up to 200MHz.
Its power specifications such as a wide current gain of between 70 to 700 ensure that it can work with both low and high-power applications.
How C1815 works?
Image source: components101
As we have mentioned, C1815 is an NPN transistor. It comprises of three layers of the semiconductor materials and each layer has unique charge specifications. The C1815 pinout comprises of the base, collector and emitter.
The emitter and the collector layers have n-type materials while the base layer has the p-type material.
In order to understand how C1815 transistor works, it will be prudent to know the basic working principle of transistors.
NPN transistors are controlled by the current flowing through the terminals. The base controls how current flows between the collector and the emitter. Current comes through the collector and out through the emitter.
When you connect a small voltage on the base, it will create current between the collector and the emitter. This current is then amplified by the base before coming out through the emitter.
For example, if you increase the base voltage, the current between the collector and emitter will automatically increase. This current will then be used to switch devices that need high current. Such as LED. Or even motors.
Since C1815 is a BJT (Bipolar Junction Transistor), it has two current flowing through it. These are the collector current and the base current. The latter is used fir turning the transistor while the latter is used for amplification. An increase of the base current will result to a subsequent increase of the collector current.
For the C1815 to work perfectly, you must apply correct voltage to its terminals as this will influence its overall performance. This is why you should verify the C1815 transistor specifications before buying.
How to safely run the C1815?
C1815 is usually connected to a circuit using the NPN configuration mode. Here the collector is connected to the positive source while the base is connected to the negative source. The emitter is grounded. This connection ensures that this transistor can function either as a switch or an amplifier depending on what you intend to achieve.
Even though we have discussed connecting C1815 transistor to a circuit, safety is always an important issue.
The safest way to connect this transistor is by avoiding to connect a load of 150mA directly to the transistor.
Also, ensure that it always operates below the maximum collector-emitter-voltage. Another safety tip is to use a suitable base resistor so that it can provide the required base current. Finally, pay attention to the maximum and minimum temperature requirements of the transistor.
C1815 Transistor Advantages
Here are the key advantages of the C1815 transistor:
-High current and voltage: The transistor has the capacity to handle high voltage and current. And this is why it is used for the amplification function. It can handle voltage of up to 500V hence suitable for high-drain applications.
-Super reliable: The fact that C1815 has a high mean time between failure makes it more reliable as compare to similar electronic components.
-High temperature range: Do you have an application that will be used under extreme temperature conditions? Consider using the C1815 transistors. They are designed to survive in high temperature range(55-150ºC)
-Compact size and design: The transistor has quite impressive physical characteristics. The compact design and make ensures that it can fit into small spaces in the circuit.
-Low noise: This simply means that the transistor is designed to minimize electromagnetic interference. This is an important feature as it prevents distortion during the amplification.
-High current gain: C1815 transistors tend to have high current gain. They can take in low current from the input and amplify to a significantly high current.
C1815 technical specifications
Here are the technical specs that determine the performance and functionality of the C1815 transistor.
- Type: NPN BJT transistors
- Collector Current(IC): 150 mA
- Collector-Emitter Voltage(VCE):50V
- Package Type:TO-92
- Collector-Base Voltage(VCB):60V
- Emitter-Base Voltage (VEBO): 5V
- Collector Dissipation (Pc):400 mW
- Transition Frequency (fT): 80 MHz
- Operating and storage temperature: -55 to +150ºC
- DC Current Gain (hFE): 70-700
C1815 Equivalent
Some of the ideal equivalents, which can also be the replacements for the C1815 transistors include C945, 2N3904,2N2222, and even 2SC3198.
However, you should check the configuration of these transistors before you go ahead to use them. This is vital especially if you want to use them as replacements.
C1815 Applications
Here are some application areas of the C1815 transistors.
-Sensor circuits: There are a wide range of modern devices that have the sensing functionality. C1815 transistor is used on these circuits to detect changes of various conditions such as temperature and pressure.
-Audio amplification, both the preamplifier and amplifier stages
-RF circuits
-Switching loads
-Configuration circuits.
Choose a C1815 transistor suppliers
In case you would like to get the best out of your transistor, ensure that you buy from reputable sources. Ensure that you choose the best C1815 transistor suppliers in China such as ICRFQ for quality and affordable electronic components.
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