TIP2955 Transistor | Pinout | Equivalent | Transistor Datasheet Central Semiconductor Corp

TIP2955

The TIP2955 is a commonly used high-power PNP transistor, usually packaged in larger packages like TO-247 or TO-3P due to its ability to handle significant current and power. It supports a maximum current of up to 15A and a voltage rating of 60V, making it ideal for use in power amplifiers, linear voltage regulators, motor control circuits, and various high-power drive applications. With its excellent heat dissipation and stable amplification characteristics, the TIP2955 is especially popular in industrial equipment and heavy-duty electronics. If your circuit needs to reliably handle higher currents over the long term, this transistor would be a great choice.

TIP2955 pinout

The TIP2955 transistor typically comes in a TO-247 or TO-3P package. Always verify pin orientation from the datasheet or manufacturer’s guidelines before installation to avoid incorrect connections.

TIP2955 heatsink requirement

The TIP2955 is a high-power transistor, so managing heat properly is essential. Choosing the right heatsink ensures stable operation and long-term reliability.The TIP2955 transistor can generate significant heat (up to about 90W under certain conditions), so it must be paired with an adequately sized heatsink.For moderate operating currents (around 3-5A continuous), choose a medium-sized aluminum heatsink rated approximately 3-5°C/W.For higher continuous currents (over 5A), select a larger heatsink or a heatsink with fan-assisted cooling, ensuring a thermal resistance of less than 2°C/W.

TIP2955 equivalent transistor

All listed models share similar electrical characteristics and are suitable substitutes for the TIP2955 transistor in applications requiring high power switching and amplification.

TIP2955 transistor for audio amplifier

This circuit is a classic Class-AB audio amplifier, designed to pump out clean and powerful audio. It’s commonly used in home stereo systems, speakers, or DIY amplifier projects. Let’s break it down in simple terms:First, your audio input signal comes in through that 10μF capacitor at the left. Think of this capacitor as a gatekeeper—it lets audio signals through but blocks any unwanted DC voltage, keeping things clean.Right after, you’ve got two transistors (2SA872 and 2SA733). These two form what’s called a differential amplifier—fancy words, but it’s just a way to make the input signal stable, noise-free, and ready for amplification. Think of this as the circuit’s “clean-up crew,” making sure the audio signal stays crisp.Next, another transistor (again, a 2SA733) takes this clean signal and boosts the voltage level a bit more. The small diodes you see (those 1N4148s) are there to set just the right voltage for the transistors to run smoothly, no matter if things get a bit warm inside your amplifier.Here’s where things get powerful. The transistors labeled BD139 and BD140 step up the game by increasing the current. They’re the “drivers,” making sure the signal is strong enough to push the final stage transistors. This stage also reduces distortion, helping your music sound clearer.Finally, the big guys—TIP2955 (PNP) and TIP3055 (NPN)—form a push-pull arrangement at the output. Imagine them as two teammates, handling different parts of your audio wave. TIP2955 handles the positive half, TIP3055 the negative half. Together, they efficiently drive your speakers, delivering loud, powerful, and clear audio.

TIP2955 vs TIP3055 (complementary pair)