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TIP122 NPN Transistor
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The TIP122 is an NPN Darlington transistor in a TO-220 package, commonly used for switching and driving high-current loads such as motors, solenoids, and rel...
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The TIP122 is an NPN Darlington transistor in a TO-220 package, commonly used for switching and driving high-current loads such as motors, solenoids, and relays from microcontroller logic signals.
Specifications
- Type – NPN Darlington (BJT)
- Package – TO-220
- Collector-Emitter Voltage (Vce) – 100 V
- Collector Current (Ic) – 5 A
- Power Dissipation – 65 W (at 25°C)
- DC Current Gain (hFE) – 1000 min
- Mounting – Through-hole, solder legs
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- Power dissipation
- Power dissipation is electrical energy being turned into heat inside a component. It matters because too much heat can reduce efficiency, affect reliability, or require a larger component or better cooling.
- through-hole
- A mounting style where the component leads pass through holes in a circuit board and are soldered on the other side. Through-hole parts are often easier to handle and solder by hand, which is useful for classroom and hobby projects.
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