PN4250_D74Z

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The PN4250_D74Z is a single Bipolar Junction Transistor (BJT) usually used in circuit designs requiring a durable transistor that can pass relatively high current levels. While not the best choice for new designs due to its lack of modern features, it is often used in legacy designs and present on many printed circuit boards, making it a valuable part of many electronics stores.

The PN4250_D74Z is a NPN type transistor with an active region of 0.41 uAgs and a maximum breakdown voltage of 400V. The collector-base junction is rated to pass up to 2A of collector current, with a peak base current of 1A. The transistor has a collector-emitter saturation voltage of 0.4V, and a total capacitance of 1.25pF. It also features a heat sink, with a heat sink performance of 10.6degC/W, making it excellent at absorbing heat during extended periods of use.

The PN4250_D74Z is designed to be used in a wide range of applications, such as amplifiers, switching circuits, regulated power supplies, speakers, motor drivers and digital logic systems. In many cases, it is used in designs that require differential or complementary inputs, or a voltage gain of 10 or more. The transistor can be used for either common-emitter or common-base configuration, providing the flexibility for a range of circuit designs.

The PN4250_D74Z works on the principle of creating a current between the collector and the emitter. A voltage applied to the base, or base current, controls the amount of current that flows between the collector and emitter. This current flow is limited by the voltage drop across the base-emitter junction, known as the cut-off voltage. This voltage must be greater than the base-emitter turn-on voltage in order for the transistor to operate properly.

When used in a common-emitter configuration, the base-emitter junction functions as an input, while the collector-emitter junction acts as the output. The current gain of the transistor is the ratio of the collector current to the base current, usually expressed as hFE. In the common-base configuration, the collector-emitter junction is the input and the base-emitter junction is the output.

The PN4250_D74Z is a reliable and long-lasting single transistor that can be used in a variety of applications. While it is not the best choice for new designs due to its comparatively low power and lack of modern features, it is still a valuable addition to many electronics inventory. Its range of application uses, coupled with its strength in enduring high current levels, make it a useful and reliable option for both legacy and new designs.

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