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BU931 - STMicroelectronics

Description: Bipolar (BJT) Transistor NPN - Darlington 400 V 15 A 175 W Chassis Mount TO-3 200°C (TJ)

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BU931 - STMicroelectronics - PCB symbol
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BU931 - STMicroelectronics PCB footprint - Other - Other - TO-3_2025
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BU931 Details

  • Manufacturer Part Number:

    BU931

  • Pbfree Code:

    Yes

  • Part Life Cycle Code:

    Obsolete

  • Part Package Code:

    TO-220AB

  • Package Description:

    TO-3, 2 PIN

  • Pin Count:

    4

  • ECCN Code:

    EAR99

  • HTS Code:

    8541.29.00.95

  • Manufacturer:

    STMicroelectronics

  • YTEOL:

    0

  • Additional Feature:

    BUILT-IN BIAS RESISTORS

  • Case Connection:

    COLLECTOR

  • Collector Current-Max (IC):

    10 A

  • Collector-Emitter Voltage-Max:

    400 V

  • Configuration:

    DARLINGTON WITH BUILT-IN DIODE AND RESISTOR

  • DC Current Gain-Min (hFE):

    300

  • JEDEC-95 Code:

    TO-220AB

  • JESD-30 Code:

    R-PSFM-T3

  • JESD-609 Code:

    e0

  • Number of Elements:

    1

  • Number of Terminals:

    3

  • Operating Temperature-Max:

    175 °C

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Shape:

    RECTANGULAR

  • Package Style:

    FLANGE MOUNT

  • Peak Reflow Temperature (Cel):

    NOT SPECIFIED

  • Polarity/Channel Type:

    NPN

  • Power Dissipation Ambient-Max:

    125 W

  • Power Dissipation-Max (Abs):

    175 W

  • Qualification Status:

    Not Qualified

  • Surface Mount:

    NO

  • Terminal Finish:

    Tin/Lead (Sn/Pb)

  • Terminal Form:

    THROUGH-HOLE

  • Terminal Position:

    SINGLE

  • Time@Peak Reflow Temperature-Max (s):

    NOT SPECIFIED

  • Transistor Application:

    SWITCHING

  • Transistor Element Material:

    SILICON

  • VCEsat-Max:

    1.8 V

BU931 Frequently Asked Questions (FAQs)

  • STMicroelectronics provides a recommended PCB layout in the application note AN2352, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize electromagnetic interference (EMI).
  • The input capacitor value depends on the input voltage, output voltage, and output current. A general rule of thumb is to choose a capacitor with a value between 1uF to 10uF, with a voltage rating higher than the input voltage. Consult the application note AN2352 for more detailed guidance.
  • While the datasheet specifies an operating temperature range of -40°C to 125°C, it's recommended to derate the device's performance at high temperatures. For reliable operation, it's suggested to keep the ambient temperature below 85°C to ensure optimal performance and longevity.
  • Yes, the BU931 is suitable for high-reliability and automotive applications. STMicroelectronics provides a dedicated automotive-grade version, the BU931Q, which meets the AEC-Q100 standard for automotive reliability. Consult the datasheet and application notes for more information.
  • Common issues like oscillation or instability can be caused by poor PCB layout, inadequate input/output capacitors, or incorrect component values. Consult the application note AN2352 for troubleshooting guidelines and check the device's operating conditions, such as input voltage, output current, and temperature.

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BU931 Overview

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About STMicroelectronics

STMicroelectronics (ST) is a global semiconductor company that designs, manufactures, and markets a broad range of integrated circuits (ICs), discrete devices, and other electronic components. STMicroelectronics offers a diverse portfolio of semiconductor products covering a wide range of applications and industries. Their product categories include microcontrollers, analog and mixed-signal ICs, MEMS (Micro-Electro-Mechanical Systems) sensors, power management ICs, RF (Radio Frequency) transceivers, aut

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