- Transistors
- What is a transistor
- Darlington Pair transistor configuration and features
- Most Commonly Used Transistors
- Different Types of Transistors
- One Coin Newsletter
- Working of Transistor as a Switch
- C828 transistor Pinout, Equivalent, uses, working
- C945 Transistor Pinout, feature, Equivalent
- IRF740 N-Channel Power Mosfet Features, Application
- C1815 Transistor Pinout, Equivalent, Uses, Features
- IRF3205 MOSFET Pinout, Its Features and Application
- 2SA1015 Transistor, Pinout, Features ,alternate
- BC547 Transistor Pinout, Features, uses, working
- BC108 Transistor Pinout, Equivalent
- BC548 Transistor Pinout, Equivalent, Uses
- BC549 Transistor Pinout, Features
- BC550 Transistor pinout features
- BC556 Transistor Pinout, Equivalent
- BC557 Transistor Pinout, Equivalent, Features Features Specifications
- BC558 Transistor Pinout, Equivalent
- BC559 General Purpose PNP Transistor
- BC560 Pinout, Equivalent features
- BC847W Transistor pinout, equivalent
- TIP120 Transistor Pinout, Equivalent and Features
- TIP122 Transistor Pinout, Equivalent, Uses, Features
- TIP127 Transistor Pinout, equivalent & Features
- KSA1220 Transistor pinout, Features and other detail
- KSA992 Transistor Pinout, Features and uses
- TIP32C Transistor pinout Features and Applications
- 2N3904 Transistor Pinout, Features and applications
- 2N3906 Pinout, Features, Equivalent uses
- BD139 Transistor Pinout, Features, Alternate
- BD140 Transistor Pinout, Equivalent
- 2N2222A Transistor: Pin Configuration
- Transistor 2N2907 Pinout Features
- 2N7000 N-Channel MOSFET
- 2N7002 N-channel Logic Level MOSFET
- 2SA1943 Transistor Pinout, Features
- MJE13009 Transistor Pinout, Features
BD139 Transistor Pinout, Features, Alternate
BD139 transistor is a popular NPN type used in a variety of electronic circuits. It is an ideal transistor due to its high collector current and low cost. Due to these features, it is used in educational electronics projects as well as in commercial electronics circuits. This transistor can load up to 1.5A so you can drive high-current components like high-current relays, motors, LEDs, etc. It can easily survive in almost all electronic circuits because the collector-emitter and collector base voltage is very high up to 80 volts. It is also ideal to use in amplifier circuits due to 12.5W collector dissipation. The saturation voltages of BD139 are just 0.5V.
Pin Configurations of BD139
| NO | Pin Name | Description |
| 1 | Emitter | Current Drains out through the emitter |
| 2 | Collector | Current flows in through the collector |
| 3 | Base | Controls the biasing of the transistor, Used to turn ON & OFF. |
Features / technical specifications of BD139
- Plastic casing: NPN Transistor
- Available Package: TO-126
- Continuous Collector current(IC): 1.5A
- Collector-Emitter voltage (VCE): 80V
- Collector-Base voltage (VCB): 80V
- Emitter Base Breakdown Voltage(VEBO): 5V
- Collector Dissipation (Pc): 5 Watt
- Max Transition Frequency (fT): 190 MHz
- DC Current Gain (hFE): 25 – 250
- Max Storage & Operating temperature: -55 to +150 Centigrade
BD139 Equivalent NPN Transistors
BD136, BD138,BD230, 2SC5171S, BD349, and BD379
Perfect Alternative to BD139 Transistor
D882 is the perfect alternative to BC139
PNP Complementary of BD139 Transistor
Complementary of BD139 is BD140
Applications
- Switching circuits
- RF Amplifiers circuit
- Audio amplifiers applications
- Amplification circuits
- Load driver circuits
Where to use BD139 Transistor
This transistor was first manufactured by Philips rated at 160MHz especially for audio applications, later it was cloned by other manufacturers like ST, Samsung, etc.
Due to a high collector current of 1.5A, this transistor can be used to control (On/Off) high loads that consume less than 1.5A. The saturation voltages (Base Emitter Voltage VBE) of only 5V, which makes it easy to use in digital electronics which has an operating voltage of 5V. It comes in a plastic jacket which is the way its cost is very less and the most important feature of a plastic jacket is that it will not be effect by other noise.
Datasheet of BD139
The datasheet of this transistor is given in this link.
Other NPN Transistors
BC547, BC548, BC549, 2N2222A, C945, C1815
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