BD140 TO-126 Transistor – KSH 10 at HIMASTORES Mombasa – best electronics in Kenya
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BD140 TO-126 Transistor

SKU: HMJ837 Category: Transistors
KSH 10.00
In Stock

Product Description

BD140 TO-126 Transistor (PNP)

1.5A PNP Medium Power Transistor for Audio and Switching Applications

The BD140 is a mediumpower PNP bipolar junction transistor (BJT) housed in a TO126 (SOT32) plastic package[citation:1][citation:2]. Designed as a complementary device to the NPN transistor BD139[citation:5][citation:8], it is wellsuited for a variety of driver stages in hifi amplifiers, television circuits, and general-purpose power applications[citation:2][citation:3].

Device Type: PNP Bipolar Junction Transistor (BJT)
Package: TO-126 (SOT32) [citation:1][citation:2][citation:4]
Maximum Collector Current (IC): 1.5A (DC); 2A peak[citation:1][citation:4]
NPN Complement: BD139 [citation:5][citation:8]
Ensure correct pin identification: Pin 1 is the Emitter, Pin 2 is the Collector, and Pin 3 is the Base[citation:2][citation:5]. The collector is electrically connected to the metal mounting tab[citation:2][citation:4].
Do not exceed the maximum ratings to prevent permanent damage.

Key Technical Specifications

ParameterValueNotes
:-:-:-
Collector-Base Voltage (VCBO)-80V[citation:1][citation:4][citation:6]
Collector-Emitter Voltage (VCEO)-80VMaximum continuous voltage[citation:1][citation:6]
Emitter-Base Voltage (VEBO)-5V[citation:1][citation:4][citation:6]
Collector Current (IC)-1.5AContinuous current rating[citation:1][citation:4]
Peak Collector Current (ICM)-2ANon-repetitive peak current[citation:1][citation:4]
Power Dissipation (Ptot)8W to 12.5WVaries by manufacturer; depends on heatsinking[citation:6][citation:7][citation:8]
Power Dissipation (Ptot)1.25WWithout heatsink at 25°C ambient[citation:1][citation:9]
DC Current Gain (hFE)25 - 250Depends on variant and conditions[citation:6][citation:8]
Transition Frequency (fT)160 MHzTypical value[citation:1][citation:4]
Operating/Storage Temperature-65°C to +150°C[citation:1][citation:4][citation:7]

= Key Features =

Complementary PNP Design - Designed as a complementary transistor to the BD139 (NPN)[citation:5][citation:8]

High Current Capability 1.5A continuous collector current for mediumpower applications[citation:1][citation:7]

Low Saturation Voltage 0.5V maximum at IC = 500mA ensures low conduction losses[citation:1][citation:4]

Versatile Performance - 160 MHz transition frequency for suitability in audio and RF driver stages[citation:1][citation:4]

= Applications =

  • Driver stages in hi-fi amplifiers[citation:2][citation:3]
  • Television circuits[citation:2][citation:3]
  • General-purpose power applications[citation:2][citation:3]
  • Power management circuits[citation:7]
  • Industrial control[citation:7]
  • Audio circuits[citation:5]
Reliable Performance Designed for generalpurpose power applications[citation:2]
Widely Available Standard TO126 package with well-documented specifications[citation:8]

√ Ready to use A standard and welldocumented power transistor

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

Package Includes

  1. 1x BD140 PNP Transistor (TO-126 Package)
For reliable operation, ensure adequate heatsinking when dissipating significant power
This device is part of a complementary family: BD14010 and BD14016 ranks are available with differing hFE ranges for gain selection[citation:4]
For a lower voltage variant, consider the BD136 (VCEO of 45V) or BD138 (VCEO of 60V)[citation:4]
For precise pin identification, the standard TO-126 configuration is Emitter (1), Collector (2), Base (3)[citation:2][citation:5].
Some manufacturer packages may be designated as SOT32, which shares the same physical dimensions and pinout[citation:2][citation:4].

Avoid exceeding the maximum voltage ratings the collectoremitter voltage (VCEO) of 80V is critical[citation:1][citation:6]

-Avoid exceeding the maximum junction temperature of 150°C[citation:1][citation:7]

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