BC337 NPN
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The BC337 is a very common, general-purpose NPN bipolar junction transistor (BJT). It is the complementary device to the BC327 (PNP).
💡 BC337 Product Detail
Core Function and Type
Type:NPN Bipolar Junction Transistor (BJT).
Function: Primarily used for switching (turning on/off) or amplification (increasing signal strength) in low to medium power applications.
Operating Principle: Since it's an NPN transistor, current flows from the Collector to the Emitter when a small positive current is applied to the Base. It's commonly used for low side switching, where the load is connected to the positive supply and the transistor switches the load's return path to ground.
Key Specifications
| Parameter | Typical Value | Description |
| Collector Current (I_C) | 800mA | The maximum continuous current the transistor can switch or amplify. |
| Collector-Emitter Voltage (V_CE) | 45V | The maximum voltage it can withstand between the Collector and Emitter. |
| DC Current Gain (h_FE) | 100 to 630 | The ratio of Collector current to Base current (beta). This dictates the amplification factor. |
| Power Dissipation (P_D) | 625mW | the maximum power it can safely dissipate at room temperature. |
Package and Pinout
Package: The BC337 is most commonly found in the compact, plastic TO-92 through-hole package.
Pinout: When viewed from the flat side, the standard European/Pro-Electron pinout is typically:
Collector
Base
Emitter
Common Applications
The BC337 is a reliable and versatile component used in a wide range of circuits:
Low-Side Switching: Driving relays, LEDs, small motors, and other moderate-current loads that require switching the ground path.
Signal Amplification: Used in general-purpose linear amplifier stages.
Driver Stages: Used to provide a current boost to drive larger transistors or MOSFETs.
Complementary Circuits: Often paired with the BC327 (PNP) to form complementary symmetry circuits, such as in push-pull amplifiers.