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BD438 - STMicroelectronics

Description: BD438, PNP Bipolar Transistor, 4 A 45 V HFE:30 3 MHz Power, 3-Pin SOT-32

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Symbol
BD438 - STMicroelectronics - PCB symbol
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PCB Footprints
BD438 - STMicroelectronics PCB footprint - Other - Other - SOT-32 (TO-126)_1
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3D Models
BD438 - STMicroelectronics - 3D model - Other - SOT-32 (TO-126)_1
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BD438 Details

  • Manufacturer Part Number:

    BD438

  • Brand Name:

    STMicroelectronics

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SIP

  • Package Description:

    PLASTIC PACKAGE-3

  • Pin Count:

    3

  • Country Of Origin:

    India

  • ECCN Code:

    EAR99

  • HTS Code:

    8541.29.00.95

  • Factory Lead Time:

    14 Weeks

  • Manufacturer:

    STMicroelectronics

  • YTEOL:

    9

  • Case Connection:

    ISOLATED

  • Collector Current-Max (IC):

    4 A

  • Collector-Emitter Voltage-Max:

    45 V

  • Configuration:

    SINGLE

  • DC Current Gain-Min (hFE):

    40

  • JEDEC-95 Code:

    TO-126

  • JESD-30 Code:

    R-PSFM-T3

  • JESD-609 Code:

    e3

  • Number of Elements:

    1

  • Number of Terminals:

    3

  • Operating Temperature-Max:

    150 °C

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Shape:

    RECTANGULAR

  • Package Style:

    FLANGE MOUNT

  • Peak Reflow Temperature (Cel):

    NOT SPECIFIED

  • Polarity/Channel Type:

    PNP

  • Power Dissipation Ambient-Max:

    36 W

  • Power Dissipation-Max (Abs):

    36 W

  • Qualification Status:

    Not Qualified

  • Surface Mount:

    NO

  • Terminal Finish:

    Matte Tin (Sn)

  • Terminal Form:

    THROUGH-HOLE

  • Terminal Position:

    SINGLE

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

    NOT SPECIFIED

  • Transistor Application:

    SWITCHING

  • Transistor Element Material:

    SILICON

  • Transition Frequency-Nom (fT):

    3 MHz

  • VCEsat-Max:

    0.6 V

BD438 Frequently Asked Questions (FAQs)

  • A good PCB layout for the BD438 involves keeping the input and output traces separate, using a star-ground configuration, and placing the device close to the power source. Additionally, using a 4-layer PCB with a dedicated ground plane can help reduce EMI.
  • To ensure the BD438 operates within the SOA during startup, it's essential to limit the inrush current, use a soft-start circuit, and ensure the input voltage rises slowly. This can be achieved by adding a NTC thermistor or a soft-start capacitor in the input circuit.
  • A low-ESR ceramic capacitor (X5R or X7R) with a value between 10uF to 22uF is recommended for the input of the BD438. This helps to filter out high-frequency noise and ensures stable operation.
  • To protect the BD438 from overvoltage and undervoltage conditions, consider adding a voltage supervisor or a reset IC that can detect and respond to voltage faults. Additionally, using a TVS diode or a zener diode can help clamp voltage transients.
  • To manage the thermal performance of the BD438, ensure good airflow around the device, use a heat sink if necessary, and consider using a thermal interface material (TIM) to improve heat transfer. Additionally, optimizing the PCB layout and using thermal vias can help reduce thermal resistance.

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BD438 Overview

Use the download button to access the BD438 schematic symbol, PCB footprint, and 3D model.
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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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BD438 Alternates

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Image Part Number Model
Part Image BD438STU Fairchild Semiconductor Corporation

Power Bipolar Transistor, 4A I(C), 45V V(BR)CEO, 1-Element, PNP, Silicon, TO-126, Plastic/Epoxy, 3 Pin
Part Image BD438 Central Semiconductor Corp

Power Bipolar Transistor, 4A I(C), 45V V(BR)CEO, 1-Element, PNP, Silicon, TO-126, Plastic/Epoxy, 3 Pin
Part Image BD438TG onsemi

Power Bipolar Transistor
Part Image BD438 Fairchild Semiconductor Corporation

Power Bipolar Transistor, 4A I(C), 45V V(BR)CEO, 1-Element, PNP, Silicon, TO-126, Plastic/Epoxy, 3 Pin
Part Image BD438 Crimson Semiconductor Inc

Power Bipolar Transistor, 4A I(C), 45V V(BR)CEO, 1-Element, PNP, Silicon, TO-126, Plastic/Epoxy, 3 Pin
For a full list of alternate parts for BD438, check out Findchips.com