KSA708CYTA Discrete Semiconductor Products

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The KSA708CYTA is an amplifier transistor of the Bipolar Junction Transistor (BJT) type. It is categorised as a single device, meaning its central NPN transistor has just one PNP base bringing together the two regions of highly doped negative and positive charge carriers. In comparison to dual transistors, in which each region has two PNP bases, input and output transistors, the single device offers cost and space efficiencies.

The KSA708CYTA has a wide range of applications, largely within the telecommunications arena, where its small size and high gain make it ideal for a variety of designs. Broadly speaking, any application that requires a small low power amplifier that can deliver a high gain of amplification to low currents, is suitable for use with the KSA708CYTA. Such applications are often found in consumer audio devices – for example, a cellphone earpiece – but can also be advantageous for applications requiring a single transistor in narrow spaces as may be found in certain medical apparatus.

The working principle of the KSA708CYTA is relatively simple. The transistor comprises three pins – the collector, base, and emitter. A small current is injected into the base pin and amplified by the transistor; the base current is thus much greater than the current going into the emitter pin. In engineering terms, this is known as ‘current gain’ and is measured by the ratio between the output (collector) current and the input (base) current (a phenomenon also called hFE). The KSA708CYTA has a hFE of 100-700, indicating great current gain, which is ideal for many audio amplifier applications.

Furthermore, the KSA708CYTA also offers an excellent frequency response. Increasing the frequency of the signal will increase the frequency factor (FT), to the upper frequency cutoff point of the transistor. This upper cutoff point, the first break frequency, is a measure of the highest frequency at which the transistor will remain in active mode. The KSA708CYTA has a first break frequency of 1.5GHz and is thus an ideal choice for high frequency applications, such as radio receivers or mobile phones.

The KSA708CYTA single transistor amplifier is an ideal choice for a range of audio and communication applications. Its small size, high gain, and excellent frequency response make it the ideal choice for a range of electronics applications which require a low power signal amplifier. Moreover, its affordability and space-efficiency versus dual transistors means that it is commonly used within the telecommunications arena and smaller consumer audio devices.

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