BSR31,115 Discrete Semiconductor Products

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A BSX31,115 transistor is a type of bipolar transistor designed for use in moderate power applications. It is single-ended and uses the PNP General Purpose Power Package, meaning it can handle up to one Watt of power. It is available in both surface mount and through-hole styles, making it a versatile option. This transistor is typically used as a driver or amplifier in a variety of circuits, including power, signal, and audio amplification.

The BSX31,115 is a medium-power variant of the BSX series of PNP power transistors. It is a uni-directional series, meaning it can only conduct from the collector to the emitter. It does have an integrated diode, which can be used to protect the collector from back biased current during fast switching applications. The diode is only active when the base current is over 0.7mA.

The BSX31,115 has an output of up to one watt, and its power dissipation ratings are defined as follows: Collector Current Ic of 30A, Collector EMC Current Ic_emc of 50A, and base current Ib of 5.5mA. These ratings combined with its low collector-emitter saturation voltage makes it an ideal choice for medium-power applications requiring low power loss.

The BSX31,115 has two operation modes, linear and saturation. In linear mode, the base-emitter junction does not reach its saturation voltage, allowing for the amplification of linear signals such as the audio signal. In saturation mode, the transistor is turned into an open switch which is ideal for high-frequency switching operations. The transition from linear to saturation mode happens when the base current exceeds 0.7mA.

The optimal operating conditions for the BSX31,115 are as follows: Collector-emitter bias of 0.45 to 1.2 volts, base-emitter bias of -0.2 to -0.6 volts, and collector-base bias of -0.2 to -0.6 volts. The typical transition frequency fT of this device is 10MHz, meaning it is suitable for use in high frequency applications. Maximum collector-emitter saturation current is 240mA while maximum collector-base cut-off current is 3mA.

The practical applications of the BSX31,115 include light dimming, motor control, solenoid and relay driving, as well as audio pre-amplification. Additionally, it is suitable for use as a power switch in high frequency converters, such as an inverter, driver, or servo-motor control. With its broad power range, the BSX31,115 is an excellent choice for any circuit which requires low power loss, reliable performance, and multiple power supply settings.

In conclusion, the BSX31,115 is an excellent option for any medium-power application. It has an integrated diode, an output of up to one watt, and a broad range of power settings making it suitable for a variety of uses. Furthermore, its optimal operating conditions, maximum power dissipation ratings, and transition frequency make it a reliable and high-power option, perfect for a variety of audio, power, and signal applications.

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