Infineon BC847BE6327 General-Purpose NPN Bipolar Junction Transistor (BJT) - Datasheet and Application Overview

The Infineon BC847BE6327 is a widely used NPN bipolar junction transistor (BJT) belonging to the BC847 series, a family renowned for its reliability and versatility in general-purpose amplification and switching applications. Housed in a compact SOT-23 surface-mount package, this transistor is a fundamental building block in modern electronic design, from consumer gadgets to industrial control systems.

Key Datasheet Parameters and Characteristics

A thorough review of the datasheet reveals the electrical characteristics that define the component's performance. The BC847BE6327 is part of a "B" gain group, which specifies a DC current gain (hFE) range of 200 to 450 at a collector current of 2 mA and a collector-emitter voltage of 5 V. This high gain makes it exceptionally efficient for amplifying small signals.

The device's voltage ratings are suitable for low-voltage circuits, with a collector-emitter voltage (VCEO) of 45 V and a collector-base voltage (VCBO) of 50 V. The continuous collector current (IC) is rated at 100 mA, which is ample for driving relays, LEDs, and other small loads. Furthermore, it features a low saturation voltage, ensuring minimal power loss when operating in its fully-on (switching) state.

Notably, the BC847BE6327 is characterized by its transition frequency of 250 MHz, making it a viable option for high-frequency amplification in audio and RF stages. The SOT-23 package offers a minimal footprint on printed circuit boards (PCBs), which is critical for space-constrained designs.

Primary Applications and Circuit Implementation

The primary strength of the BC847BE6327 lies in its dual utility as both a switch and an amplifier.

1. Switching Applications: In digital circuits, the transistor is often used as an interface between microcontrollers (like an Arduino or ESP32) and higher-power devices. For instance, it can act as a low-side switch to control an LED, a small relay, or a motor. When a small current is applied to the base, the transistor saturates, allowing a much larger current to flow from the collector to the emitter, thereby activating the load.

2. Amplification Applications: In analog circuits, the BC847BE6327 is commonly employed in small-signal amplification stages. This includes pre-amplifiers for audio signals, microphone amplifiers, and various signal conditioning circuits. Its high gain allows a small AC signal at the base to be reproduced as a larger amplified signal at the collector.

A typical common-emitter amplifier configuration is a standard circuit, where carefully selected bias resistors set the operating point (Q-point) of the transistor to ensure clean, linear amplification without distortion.

ICGOODFIND Summary

The Infineon BC847BE6327 is a quintessential general-purpose NPN transistor that offers an optimal balance of high current gain, robust switching capability, and compact packaging. Its well-documented characteristics and predictable performance make it a default choice for engineers and hobbyists for a vast array of circuit designs, from simple switches to more complex analog amplification chains.

Keywords:

NPN Transistor

General-Purpose BJT

Small-Signal Amplification

SOT-23 Package

Current Gain (hFE)