1N4757AUR
Single 51V Zener diodes for voltage regulation in electronic circuits
Manufacturer： ['aeroflex-metelics', 'microsemi']
series introduction
# Introduction to the 1N4757AUR Product Series
## 1. Overview
The 1N4757AUR is a significant member of the voltage - regulator diode product series. These diodes play a crucial role in electronic circuits, providing a stable reference voltage that is essential for the proper functioning of various electronic devices. They are designed to operate in the reverse - breakdown region, where they can maintain a relatively constant voltage across their terminals despite changes in the current flowing through them.
## 2. Key Specifications
### Electrical Characteristics
- **Zener Voltage (Vz)**: The 1N4757AUR is specified to have a Zener voltage of 75V. This means that when the diode is operating in the reverse - breakdown mode, it will maintain a voltage of approximately 75V across its terminals. The tolerance of the Zener voltage is typically within a certain range, which ensures a high level of accuracy for voltage regulation applications.
- **Power Dissipation (Pd)**: It has a power dissipation rating, which indicates the maximum amount of power the diode can safely dissipate without getting damaged. For the 1N4757AUR, the power dissipation is an important parameter as it determines the maximum current that can flow through the diode while maintaining its voltage - regulation function.
- **Dynamic Resistance (Rz)**: The dynamic resistance of the 1N4757AUR is relatively low. A low dynamic resistance means that the change in the Zener voltage with respect to the change in the current is small. This property is crucial for applications where a stable voltage is required, as it helps to minimize voltage fluctuations due to changes in the load current.
### Physical Characteristics
- **Package Type**: The 1N4757AUR is usually available in a standard package, such as the DO - 41 package. This package is widely used in the electronics industry due to its simplicity and ease of handling. It provides good mechanical protection for the diode and allows for easy mounting on printed circuit boards (PCBs).
- **Dimensions**: The dimensions of the DO - 41 package are well - defined, which makes it compatible with standard PCB layouts. This standardization simplifies the design and manufacturing process of electronic circuits that incorporate the 1N4757AUR.
## 3. Working Principle
When a reverse voltage is applied to the 1N4757AUR, initially, only a very small reverse leakage current flows through the diode. As the reverse voltage increases and reaches the Zener voltage (Vz), the diode enters the reverse - breakdown region. In this region, the current through the diode can increase significantly, but the voltage across the diode remains relatively constant at the Zener voltage. This characteristic is exploited in voltage - regulation circuits, where the diode is used to provide a stable reference voltage.
## 4. Applications
### Power Supply Circuits
- In linear power supplies, the 1N4757AUR can be used to regulate the output voltage. By connecting the diode in parallel with the load, it can maintain a constant voltage across the load, even if the input voltage or the load current changes. This helps to ensure that the electronic devices connected to the power supply receive a stable and reliable power source.
- Switch - mode power supplies also benefit from the use of the 1N4757AUR. It can be used in the feedback loop to provide a stable reference voltage, which is essential for the proper operation of the control circuitry that regulates the output voltage of the power supply.
### Voltage Reference Circuits
- Many electronic circuits require a stable voltage reference for accurate operation. The 1N4757AUR can be used as a voltage reference in analog - to - digital converters (AD
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