BD237 TO-126 Transistor – KSH 10 at HIMASTORES Mombasa – best electronics in Kenya
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BD237 TO-126 Transistor

SKU: HMJ841 Category: Transistors
KSH 10.00
In Stock

Product Description

BD237 TO-126 Transistor (NPN)

2A NPN Medium Power Transistor for Audio and Switching Applications

The BD237 is a mediumpower NPN bipolar junction transistor (BJT) housed in a TO126 (SOT-32) package [citation:1][citation:7]. Designed for use in 5.0 to 10W audio amplifiers and drivers, it is the NPN complement to the PNP transistor BD238 [citation:2][citation:4].

Device Type: NPN Bipolar Junction Transistor (BJT)
Package: TO126 (SOT32) [citation:1][citation:7]
Maximum Collector Current (IC): 2A [citation:1][citation:3]
PNP Complement: BD238 [citation:2][citation:5]
Ensure correct pin identification: Pin 1 is the Emitter, Pin 2 is the Collector, and Pin 3 is the Base [citation:3][citation:6]. The collector is electrically connected to the metal mounting tab.
Do not exceed the maximum ratings to prevent permanent damage.

Key Technical Specifications

ParameterValueNotes
:-:-:-
Collector-Base Voltage (VCBO)100V[citation:4][citation:6][citation:7]
Collector-Emitter Voltage (VCEO)80VMaximum continuous voltage [citation:1][citation:5][citation:7]
Emitter-Base Voltage (VEBO)5V[citation:3][citation:5][citation:6]
Collector Current (IC)2AContinuous current rating [citation:1][citation:3][citation:7]
Power Dissipation (Ptot)25WAt case temperature of 25°C [citation:1][citation:2][citation:4]
Power Dissipation (Ptot)1.25WWithout heatsink at 25°C ambient [citation:10]
DC Current Gain (hFE)40 minAt IC 150mA, VCE 2V [citation:1][citation:4][citation:7]
Transition Frequency (fT)3 MHzTypical value [citation:1][citation:2][citation:5]
Operating/Storage Temperature-65°C to +150°C[citation:1][citation:5][citation:6]

= Key Features =

Complementary NPN Design - Designed as a complementary transistor to the BD238 (PNP) [citation:2][citation:5]

High Current Capability 2A continuous collector current for mediumpower applications [citation:1][citation:3][citation:4]

Low Saturation Voltage - 0.6V maximum at IC = 1A ensures low conduction losses [citation:4][citation:10]

Medium Power Dissipation - 25W with proper heatsinking [citation:1][citation:2][citation:4]

= Applications =

  • 5.0 to 10W audio amplifiers [citation:2][citation:4]
  • Driver stages in audio amplifiers [citation:1][citation:2]
  • Medium power linear applications [citation:1][citation:6]
  • Power switching circuits [citation:3][citation:6]
  • General-purpose amplification [citation:11]
Reliable Performance - Designed for audio amplifiers and drivers [citation:2][citation:4]
Widely Available Standard TO126 package with well-documented specifications

√ Ready to use A standard and welldocumented power transistor

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

Package Includes

  1. 1x BD237 NPN Transistor (TO-126 Package)
For reliable operation, ensure adequate heatsinking when dissipating significant power (above 1.25W)
For a lower voltage variant, consider the BD235 (VCEO of 60V) or BD233 (VCEO of 45V) [citation:3]
SMD equivalents are available in SOT223 (BCP56) and SOT89 (BCX56) packages [citation:5]
For precise pin identification, the standard TO-126 configuration is Emitter (1), Collector (2), Base (3) [citation:3][citation:6].
The SOT32 package is considered the SMD equivalent of the TO126 and shares the same electrical characteristics.

Avoid exceeding the maximum voltage ratings the collector-emitter voltage (VCEO) of 80V is critical

-Avoid exceeding the maximum junction temperature of 150°C

-Avoid using this transistor as a direct replacement without confirming the pinout and specifications