BC847A-7-F
NPN bipolar transistors in compact SOT-23 packages for general-purpose use
Manufacturer： ['diodes', 'diodeszetex', 'multicomp']
series introduction
# BC847A - 7 - F Product Series Introduction
## 1. Overview
The BC847A - 7 - F product series belongs to the realm of semiconductor devices, specifically small - signal transistors. These transistors are designed to handle low - power and low - voltage applications with high efficiency and reliability. They are widely used in various electronic circuits due to their excellent electrical characteristics and compact form factor.
## 2. Physical Characteristics
### Package
The BC847A - 7 - F transistors are typically housed in a SOT - 23 surface - mount package. This package offers several advantages. It is extremely small in size, which is ideal for modern printed circuit boards (PCBs) where space is at a premium. The SOT - 23 package also provides good thermal performance, allowing the transistor to dissipate heat effectively during operation. It has three leads, which are clearly marked for easy identification and connection on the PCB.
### Dimensions
The SOT - 23 package has standard dimensions. The length is approximately 2.9 mm, the width is around 1.3 mm, and the height is about 1.1 mm. These compact dimensions make it suitable for use in miniaturized electronic devices such as mobile phones, tablets, and wearable devices.
## 3. Electrical Characteristics
### Type of Transistor
The BC847A - 7 - F is an NPN bipolar junction transistor (BJT). NPN transistors are widely used in electronic circuits because they can amplify electrical signals and act as switches. In an NPN transistor, the flow of current is mainly due to the movement of electrons.
### DC Current Gain (hFE)
One of the key electrical parameters of the BC847A - 7 - F is its DC current gain (hFE). The hFE value typically ranges from 200 to 600. This high current gain allows the transistor to amplify small input currents into larger output currents, making it suitable for applications such as signal amplification in audio circuits, where a weak audio signal needs to be boosted to a usable level.
### Collector - Emitter Voltage (VCEO)
The collector - emitter voltage (VCEO) of the BC847A - 7 - F is specified at 45V. This means that the transistor can safely operate with a maximum voltage of 45V between its collector and emitter terminals. This relatively high voltage rating makes it suitable for use in circuits that operate at moderate voltages, such as power supply regulation circuits and some low - power amplifier stages.
### Collector Current (IC)
The maximum collector current (IC) that the BC847A - 7 - F can handle is 100mA. This current rating determines the amount of current that can flow through the collector terminal of the transistor. It is suitable for driving small loads such as LEDs, small relays, and other low - power components.
### Transition Frequency (fT)
The transition frequency (fT) of the BC847A - 7 - F is typically around 300MHz. This parameter indicates the frequency at which the current gain of the transistor drops to unity. A high transition frequency makes the transistor suitable for high - frequency applications such as radio frequency (RF) circuits and high - speed switching circuits.
## 4. Applications
### Audio Amplification
Due to its high current gain and relatively low noise characteristics, the BC847A - 7 - F is commonly used in audio amplifier circuits. It can be used in pre - amplifier stages to boost weak audio signals from sources such as microphones or audio players. The transistor can also be used in small - scale power amplifier circuits to drive small speakers.
### Signal Switching
The ability of the BC847
Images for reference
SOT23
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