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2N3904 NPN Transistor
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The 2N3904 is a popular general-purpose NPN bipolar junction transistor (BJT) in a TO-92 package. With a maximum collector current of 200 mA and a collector-...
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The 2N3904 is a popular general-purpose NPN bipolar junction transistor (BJT) in a TO-92 package. With a maximum collector current of 200 mA and a collector-emitter voltage of 60 V, it's one of the most commonly used small-signal transistors for switching and amplification.
Key Features
- NPN Bipolar Transistor – General-purpose switching and amplification
- TO-92 Package – Standard through-hole footprint
- 200 mA Collector Current – Suitable for small-signal switching
- 60 V Collector-Emitter Voltage – Handles moderate voltage applications
- Low Power Dissipation – 625 mW at 25 °C
Specifications
- Type – NPN BJT
- Package – TO-92
- Collector-Emitter Voltage (Vce) – 60 V
- Collector Current (Ic) – 200 mA
- Current Gain (hFE) – 70 minimum
- Power Dissipation – 625 mW at 25 °C
Ideal For
- Small-signal switching circuits
- Signal amplification
- Arduino and microcontroller interfacing
- Beginner electronics projects and learning
Jargon buster
Plain-language definitions for the technical terms used above.
- 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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