What is difference between silicon diode and Zener diode?

Silicon diodes and germanium diodes are the most common transistor components. Meanwhile, they are all semiconductor materials widely used in electrical engineering. Among them, silicon diodes and germanium diodes are often used in physics experiments for rectification, current limiting, reverse protection, power supply stability, and other aspects due to their simple structure, high reliability, and strong voltage resistance. In practical use, both silicon diodes and germanium diodes have a common feature, which is that they can only conduct current under forward voltage, while they do not conduct current under reverse voltage.

 

Germanium diodes are often used in low-power applications, but with the increasing development of technology, their market share has been replaced by silicon diodes. Especially in today's high-efficiency, high-voltage, and low-cost application environment, silicon diodes have become the representative of most semiconductor rectifiers.

 

Compared to silicon diodes, voltage regulator diodes are usually more familiar to people. Especially applied in power supply designs that provide readily available values, Zener diodes are also known as Zener diodes. Its function is mainly to prevent circuit overvoltage, because when the circuit exceeds a current threshold or voltage threshold, the current can be actively limited.

 

Both silicon diodes and Zener diodes (i.e. Zener diodes) are semiconductor devices with the characteristics of conducting under forward voltage and cutoff current under reverse voltage.

 

Zener diode

Zener diodes, commonly known as germanium zener diodes or Zener diodes, are a type of voltage regulator device that can operate in reverse voltage reduction mode. Usually, when its reverse voltage reaches a specific specified level, the voltage regulator diode can maintain a constant reverse voltage at the set static design level without much current flowing through. This specific voltage is called the Zener voltage point, which is the reverse voltage level compressed by the voltage regulator diode. When the forward voltage is above the Zener voltage, the forward terminal behavior of the voltage regulator diode is the same as that of a regular diode, and it can conduct current.

 

Silicon diode

Silicon is a more common elemental material than germanium. It has high substitutability and is commonly used in the production of circuits such as switches, rectifiers, rectifier filters, and regulators. Silicon diodes are widely used in various fields due to their high mass energy, good thermal performance, high resistance capacitance ratio, and excellent high-power characteristics. The appearance of a silicon diode is similar to that of a germanium diode, except that silicon is used instead of germanium. When the working power supply is high enough, the dry upper limit current of silicon diodes is similar to that of silicon emitting transistors, and their conductivity coefficient is often higher than that of germanium diodes.

 

The difference between silicon diodes and voltage regulator diodes

 

Chip materials

Germanium diodes are made of germanium materials, while silicon diodes are made of silicon materials. Silicon materials are more common than germanium materials, therefore, silicon diodes usually have more application value. In addition, silicon materials have superior performance compared to germanium materials, as they have stronger compressive strength and can support higher maximum operating voltages.

 

life

The service life of germanium diodes is shorter than that of silicon diodes, therefore, silicon diodes are more suitable than germanium diodes in applications that require long-term use or require a longer lifespan.

 

reliability

Silicon diodes are more reliable than germanium diodes because silicon materials have higher compressive strength and stronger corrosion resistance. In testing, silicon diodes have better disinfection resistance and stability.

 

Input features

Under forward current, the input characteristics of silicon diodes and germanium diodes are very similar. However, there is a significant difference in input characteristics between the two when subjected to reverse voltage. The reverse voltage and current of germanium diodes are lower than those of silicon diodes, which means that germanium diodes can operate normally at a reverse voltage higher than that of silicon diodes.

 

price

Due to the material and reliability of silicon diodes, they are more advanced and reliable compared to germanium diodes, resulting in higher prices.

 

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