BC327 PNP
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The BC327 is a very common, general-purpose PNP bipolar junction transistor (BJT). It's often used in conjunction with its complementary NPN counterpart, the BC337.
💡 BC327 Product Detail
Core Function and Type
Type:PNP Bipolar Junction Transistor (BJT).
Function: Primarily used for switching (turning on/off) or amplification (increasing signal strength) in low to medium power circuits.
Operating Principle: Since it's a PNP transistor, current flows from the Emitter to the Collector when a small negative current is applied to the Base. In short, it's typically used to switch or drive a load connected to the positive supply rail (V_CC).
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 (when Base is open). |
| 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. |
| Transition Frequency (f_T) | 100MHz | Indicates its suitability for high-frequency amplification. |
Note: For PNP transistors, voltages and currents are often specified as negative relative to the Emitter.
Package and Pinout
Package: The BC327 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 (like for the BC547 series) is typically:
Collector
Base
Emitter
Common Applications
The BC327 is a versatile component widely used in:
Switching Loads: Driving relays, LEDs, motors, and other moderate-current loads that require groundside switching.
Audio/Signal Amplification: Used in small signal amplification stages.
Driver Stages: Used in the output stages of power amplifiers or in switching power supplies.
Complementary Circuits: Often paired with the BC337 (NPN) for use in push-pull output configurations.