The TIP105 is a high-current PNP Darlington power transistor commonly used in power switching and load-driving circuits. This article explains the TIP105 pinout, features, specifications, working principle, applications, and equivalent options in a clear 9-heading format.
Introduction
The TIP105 is a PNP Darlington power transistor designed for medium- to high-power applications. Its Darlington structure provides very high current gain, allowing large load currents to be controlled with a relatively small base drive. It is widely used where negative-side switching or complementary pairing with NPN devices is required.
Pin Configuration / Pinout of TIP105 Transistor
Understanding the TIP105 Pinout Configuration
The TIP105 is available in a TO-220 package with a B-C-E pin configuration:
| Pin# | Pin Name |
|---|---|
| 1 | Base |
| 2 | Collector |
| 3 | Emitter |
Correct identification of the TIP105 pinout is essential for proper circuit operation and to prevent device failure.
Note: DATASHEET DOWNLOAD button is provided end of this article.
TIP105 Key Features
- PNP Darlington transistor configuration
- Very high DC current gain
- Capable of driving high-current loads
- Suitable for negative-side switching
- Rugged TO-220 power package
- Compatible with low-power control circuits
TIP105 Specifications / Characteristics
- Collector-Emitter Voltage (VCE): 60V
- Collector-Base Voltage (VCB): 60V
- Emitter-Base Voltage (VEB): 5V
- Collector Current (IC): 8A
- Power Dissipation (PD): 80W
- Junction Temperature (Tj): 150 °C
- Storage Temperature (Tstg): −65 °C to +150 °C
- Package Type: TO-220
- Pin Configuration: Base – Collector – Emitter
Key Applications of TIP105 Transistor
- Power switching circuits
- Relay and solenoid drivers
- DC motor control (PNP side)
- Complementary amplifier stages
- Industrial control and automation systems
TIP105 Equivalent / Alternatives
(Verify pin compatibility before using substitutions)
Equivalent MOSFETs: TIP104, TIP106
Alternative MOSFETs: TIP125, BD680, MJ2955 (with suitable design changes)
More Circuit Layouts
Working Principle of TIP105
The TIP105 operates as a Darlington pair, where two internal PNP transistors amplify the base current in stages. When a suitable negative base drive is applied, the device allows a much larger current to flow from emitter to collector, enabling efficient control of high-power loads.
Frequently Asked Questions (FAQ)
Q1: Is TIP105 a MOSFET?
No, TIP105 is a PNP Darlington bipolar junction transistor.
Q2: Can TIP105 be paired with an NPN transistor?
Yes, it is commonly paired with TIP100/TIP101/TIP102 in complementary designs.
Q3: Does TIP105 need a heat sink?
Yes, a heat sink is recommended for high-current or continuous operation.
Q4: Where is TIP105 mainly used?
In power drivers, switching circuits, and industrial control applications.
Conclusion
The TIP105 PNP Darlington power transistor is a reliable choice for high-current negative-side switching and complementary power designs. With its high gain, solid thermal ratings, and simple TO-220 pinout, it remains a practical solution for many power electronics applications.
Datasheet of TIP105 Transistor
Click the following Button below to download the datasheet of TIP105 :
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