CPH3145-TL-E

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The CPH3145-TL-E is a single Bipolar NPN transistor, commonly used in many electronic applications. This transistor, manufactured by Central Semiconductor and rated at 25V, is highly suitable for general purpose switching and low-power amplifier applications and has wide operational temperature range.

The versatile CPH3145-TL-E has a collector-emitter voltage rating of 25V, a collector-base voltage of 30V, and an emitter-base voltage of 3V, making it ideal for many practical circuit applications. It is also rated at 250mA of collector current and a gain rating of 110, allowing it to be used as both a switching and low-power amplifier transistor. Furthermore, with an operational temperature range from -55°C to 150°C and a storage temperature range from -65°C to 175°C, this transistor proves to be durable in many temperature-sensitive applications, making it a highly reliable option.

The development of a working circuit utilizing the CPH3145-TL-E requires knowledge of the working and biasing principles of a transistor, as well as its application. A transistor, being a semiconductor device, is dependent on the current through it to alter its operating characteristics. This current is composed of two parts, the collector current and the base current. When a voltage is applied on the base and the emitter, current flow takes place, the collector current then becomes favourable, and the transistor amplifies the signal at the emitter.The various currents through the transistor must be balanced to ensure proper operation of the circuit. To do this, the supply voltage is divided among the base, collector, and emitter by using bias resistors. The collector current is determined by the voltage drop between the emitter-base junction and the base-collector junction, while the base current is determined solely by the voltage across the base-emitter junction. For proper operation, the collector current should be set first and then the base current adjusted accordingly. If the base current is too high, the collector current will be limited, resulting in poor signal amplification, whereas if the base current is too low, the signal will be amplified but at a higher voltage than desired. This highlights the importance of setting the proper bias resistors for any application.

The CPH3145-TL-E is a versatile single bipolar NPN transistor that is suitable for use as a general purpose switching and low-power amplifier. With a collector-emitter rating of 25V and a gain rating of 110, it is reliable and dependable in many temperature-sensitive applications. When utilizing this transistor in any application it is important to understand its working parameters and principles, as well as the biasing requirements.

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