In today’s highly integrated electronic systems, transient voltage suppression has become crucial for ensuring the stable operation of devices. As a key component in the family of semiconductor discrete devices, the Transient Voltage Suppressor Diode (TVS Diode) plays an irreplaceable role in protecting circuits from transient overvoltage surges, thanks to its unique characteristics. Today, we will take a closer look at the SMBJ26CA transient voltage suppressor diode, analyzing its key parameters and demonstrating its outstanding performance in circuit protection.

Key Parameters Breakdown

VRWM (V): 26V  

VRWM (Working Peak Reverse Voltage) is the maximum reverse voltage that the TVS diode can withstand during normal operation. The VRWM of the SMBJ26CA is 26V, meaning the diode can operate stably and reliably protect the circuit as long as the voltage does not exceed this value.

Slkor Transient Protection Diode MMBZ5243B product photo

VBR min (V) & VBR max (V): 28.9V ~ 33.2V  

VBR (Breakdown Voltage) is the voltage at which the TVS diode begins to conduct and suppress the overvoltage. The breakdown voltage range of the SMBJ26CA is between 28.9V and 33.2V. This wide range allows the diode to handle different overvoltage situations in various circuits, ensuring rapid response when needed and effective suppression of transient overvoltages.

Slkor Transient Protection Diode MMBZ5243B specification

IR (μA): 5μA  

IR (Leakage Current) is the small current that flows through the diode when it is not in breakdown mode. The leakage current of the SMBJ26CA is only 5μA, which ensures that the diode’s impact on the circuit under normal operating conditions is minimal, thus enhancing the overall efficiency and stability of the circuit.

Parameters of Slkor Transient Protection Diode MMBZ5243B

VC (V): 42.1V  

VC (Clamping Voltage) is the maximum voltage the TVS diode can clamp the overvoltage to after breakdown. The SMBJ26CA has a clamping voltage of 42.1V, meaning that even if a transient overvoltage occurs in the circuit, the diode can quickly clamp it to a safe level, protecting subsequent circuit components from damage.

Package: SMB  

The SMB (Surface Mounted Device) package type is used for the SMBJ26CA. This package is compact, easy to install and solder, making it well-suited for use in high-density integrated electronic systems.

In lightning protection circuits, the SMBJ26CA transient voltage suppressor diode plays a critical role. Its operation is based on its unique electrical characteristics, particularly the breakdown voltage range and clamping voltage, which are crucial to its performance.

When lightning strikes a building or outdoor electronic equipment, it generates extremely high transient overvoltages, often far exceeding the voltage tolerance of circuit components. If such overvoltage directly impacts the circuit, it could lead to equipment damage or even catastrophic consequences, such as fires.

The SMBJ26CA transient voltage suppressor diode is designed to handle this situation. When the overvoltage from a lightning strike exceeds the diode's breakdown voltage range (28.9V to 33.2V), the diode rapidly transitions from a high-resistance state to a low-resistance state, entering breakdown mode. This breakdown process is extremely fast, occurring almost instantaneously, ensuring the diode responds to the overvoltage without delay.

After breakdown, the SMBJ26CA diode clamps the overvoltage to a relatively low level, defined by the clamping voltage (42.1V). This means that even if the overvoltage generated by a lightning strike is very high, the voltage in the circuit will be limited to a safe range by the diode, preventing damage to other components.

Furthermore, due to the low-resistance characteristics of the SMBJ26CA diode, it can quickly direct the overvoltage to the ground after breakdown, providing effective protection to the circuit. This protection mechanism not only prevents direct damage from lightning strikes but also avoids indirect damage caused by overvoltage, such as equipment malfunctions or data loss.

In summary, the SMBJ26CA transient voltage suppressor diode plays an essential role in lightning protection circuits by rapidly responding to overvoltages, clamping them to a safe range, and directing them to the ground, effectively protecting the circuit from lightning-induced damage. Its excellent performance and stable operating mechanism make it an indispensable component in lightning protection systems.

About Slkor：

Slkor has research and development offices in Busan, South Korea, Beijing, China, and Suzhou, China. Most of the wafer manufacturing and packaging and testing are carried out within China. The company employs and collaborates with individuals and organizations worldwide, with a laboratory for product performance and reliability testing and a central warehouse located at its headquarters in Shenzhen. Slkor has filed for over a hundred invention patents, offers more than 2,000 product models, and serves over ten thousand customers globally. Its products are exported to countries and regions including Europe, the Americas, Southeast Asia, and the Middle East, making it one of the rapidly growing semiconductor companies in recent years. With well-established management systems and streamlined workflows, Slkor has rapidly enhanced the brand awareness and reputation of its "SLKOR" brand through its outstanding quality and standardized services. Its product range includes three major series: diodes, transistors, and power devices, with recent introductions of new products such as Hall elements and analog devices, expanding its presence in sensors, Risc-v microcontrollers, and other product categories.