Category: Bi-polar Transistor (BJT)

Introduction The BD538 is a silicon PNP epitaxial-base power transistor designed for medium-power linear and switching applications. It provides excellent performance in audio amplifier stages, voltage regulators, and power driver circuits. With a collector current capacity of up to 8A and a collector-emitter voltage rating of –80V, the BD538 ensures reliable operation in both industrial […]

Introduction The BD537 is a silicon NPN epitaxial-base power transistor designed for medium-power switching and linear amplifier applications. It is known for its robust performance, high collector current capability, and good gain stability across a wide operating temperature range. The BD537 is widely used in audio amplifiers, voltage regulators, and driver circuits, offering excellent reliability […]

Introduction The BD536 is a silicon epitaxial-base PNP power transistor designed for medium-power linear and switching applications. It is the PNP complementary device to the BD535 NPN transistor, forming an ideal pair for push-pull and class-AB audio amplifier stages. The BD536 offers reliable performance in circuits that require strong current handling, good gain stability, and […]

Introduction The BD535 is a silicon epitaxial-base NPN power transistor designed for medium-power linear amplification and switching applications. It belongs to a transistor family of complementary power devices, engineered with planar “Base Island” layout to deliver high gain and low saturation voltage. The BD535 is a mid-voltage variant (60 V class) that bridges lower- and […]

Introduction The BD534 is a silicon PNP power transistor designed for medium- to high-power switching and amplification applications. It is commonly used in power amplifiers, voltage regulators, DC motor drivers, and complementary push-pull output stages. With its strong current handling and low saturation voltage, the BD534 provides high efficiency and stability in both industrial and […]

Introduction The BD533 is a high-power silicon NPN transistor designed for general-purpose power amplification and switching applications. It is commonly used in medium- to high-power audio amplifiers, DC motor drivers, voltage regulators, and other circuits that require reliable performance under heavy current loads. With a collector-emitter voltage of 60V and collector current up to 8A, […]

Introduction The BD442 is a silicon PNP power transistor designed for medium power linear and switching applications. It is widely used in audio amplifier output stages, voltage regulators, and driver circuits due to its reliable performance and high current handling capability. With a collector current of up to 4A and collector-emitter voltage of 80V, the […]

Introduction The BD440 is a medium-power PNP silicon epitaxial-base transistor engineered for linear amplification and switching applications. It is part of the BD43x transistor family, serving as the PNP complement to the NPN devices such as BD439 and BD441. It is packaged in a TO-126 / SOT-32 plastic case, which supports mounting to small heatsinks […]

Introduction The BD439 is a medium-power NPN silicon transistor, designed for both switching and linear amplifier applications. It belongs to a family of plastic-package power transistors (e.g. BD439, BD441) used widely in audio, power supply, and driver circuits. The BD439 is suited for designs where moderate currents and voltages are present and where symmetrical or […]