Tag: BD Series Transistors

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 […]

Introduction The BD438 is a medium-power PNP silicon transistor intended for linear amplification and switching applications. It is part of the BD43x complementary transistor family from ST / ON Semiconductor, serving as the PNP counterpart to the NPN device BD437. This transistor is packaged in a SOT-32 / TO-126 plastic case, which supports modest heatsinking […]

Introduction The BD437 is a medium-power NPN silicon transistor designed for both switching and linear amplifier applications. It is part of the STMicroelectronics BD43x series of complementary power transistors. ST describes it as a silicon epitaxial-base NPN transistor in JEDEC SOT-32 plastic packaging, intended for medium power linear and switching use. Because it belongs to […]

Introduction The BD436 is a PNP epitaxial-base medium-power silicon transistor engineered for linear amplification and switching applications. It is part of the same transistor family as BD434 and BD438, and is designed to be the PNP complement to NPN devices such as BD435. Housed in the TO-126 (JEDEC SOT-32) plastic package, BD436 offers a compact […]

Introduction The BD435 is a silicon epitaxial-base NPN power transistor intended for medium-power switching and linear amplifier applications. It belongs to the same transistor family as BD433 and BD437, packaged in a JEDEC SOT-32 / TO-126 plastic case, which is suited for modest heatsinking and robust mounting in amplifier or power circuits. Designed as a […]