BD438 TO-126 Transistor – KSH 10 at HIMA TRONICS Mombasa – Top quality transistors. Best electronics in Kenya. Shop now for Arduino, ESP32, sensors and IoT devices.
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BD438 TO-126 Transistor

SKU: HMJ847 Category: Transistors
KSH 10.00
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Product Description

BD438 TO-126 Transistor (PNP)

= 4A Medium Power PNP Transistor for Linear and Switching Applications =

The BD438 is a mediumpower PNP bipolar junction transistor (BJT) housed in a TO126 package. It is part of the BD43X series and is designed as a complementary device to NPN transistors like the BD437. This transistor is wellsuited for a variety of mediumpower linear and switching applications.

Device Type: PNP Bipolar Junction Transistor (BJT)
Package: TO-126
Maximum Collector Current (IC): -4A
Total Power Dissipation (Ptot): 36W
Ensure correct pin identification: Pin 1 is the Emitter, Pin 2 is the Collector, and Pin 3 is the Base. The collector is also electrically connected to the metal mounting tab of the package.
Do not exceed the maximum ratings to prevent permanent damage.

= Key Technical Specifications =

ParameterValueNotes
------
Collector-Emitter Voltage (VCEO)-45VMaximum continuous voltage; -60V variants exist
Collector-Base Voltage (VCBO)-45V
Emitter-Base Voltage (VEBO)-5V
Collector Current (IC)-4AContinuous current rating
Peak Collector Current (ICM)-7ANon-repetitive peak current
Power Dissipation (Ptot)36WAt case temperature of 25°C
DC Current Gain (hFE)40 - 130At IC = 2A, VCE = 1V
Transition Frequency (fT)3 MHz
Operating Temperature Range-65°C to +150°CJunction temperature range

= Key Features =

PNP Complement Designed as a complementary transistor to the BD437 (NPN) for pushpull amplifier configurations

Medium Power Capability - 4A collector current and 36W power dissipation for demanding applications

Low Saturation Voltage 0.6V max at IC = 2A ensures low losses

GlassPassivated Junction Provides reliability and high thermal cycling performance

== Applications ==

  • Carradio output stages A primary application area
  • General-purpose power amplifiers
  • Medium-power switching circuits
  • Audio amplifiers
  • Power supply regulators
  • Motor control circuits
Reliable Performance Designed for use in mediumpower linear and switching applications
Widely Available Standard TO126 package for easy integration

√ Ready to use A standard and welldocumented power transistor

√ Medium power capability - Suitable for a wide range of applications

= Package Includes =

  1. 1x BD438 PNP Transistor (TO-126 Package)
For reliable operation, ensure adequate heatsinking when dissipating significant power
Direct equivalents include the BD438G and other BD43X series variants
For a higher voltage variant, consider the BD440 (VCEO of -80V)
For precise pin identification, the standard TO-126 configuration is Emitter (1), Collector (2), Base (3).
Always check your circuit's requirements against the datasheet for your specific variant.

Avoid exceeding the maximum voltage ratings the collectoremitter voltage (VCEO) of 45V is critical

-Avoid exceeding the maximum junction temperature of 150°C

-Avoid using this transistor as a direct replacement for a PNP transistor without checking the pinout