As electronic devices become increasingly complex and transient voltage threats grow more severe, transient voltage suppressor diodes (TVS diodes) play an increasingly important role in circuit protection. The SMBJ28CA, an outstanding product in the TVS diode series, offers bidirectional protection, high-performance specifications, and broad application scenarios, providing a comprehensive upgrade for circuit safety. This article will analyze the SMBJ28CA in detail, exploring its unique advantages and application prospects in circuit protection from an innovative perspective.

1. Core Parameters of the SMBJ28CA

Polarity: Bidirectional  

The SMBJ28CA features a bidirectional polarity design, meaning it can effectively suppress transient overvoltage in both positive and negative directions, providing more comprehensive protection for the circuit.

Reverse Working Voltage (Vrwm): 28V  

This is the maximum reverse voltage the SMBJ28CA can withstand without breakdown. Under normal operating voltages, the SMBJ28CA remains stable, ensuring the circuit functions properly.

Slkor Transient Protection Diode SMBJ28CA product photo

Breakdown Voltage (Min/Max): 31.1V ~ 35.8V  

The SMBJ28CA has a moderately wide breakdown voltage range, enabling it to respond quickly and effectively suppress overvoltage when transient voltage reaches hazardous levels, protecting the circuit from damage. The wide breakdown voltage range also enhances the diode's adaptability and reliability.

Reverse Leakage Current (Ir): 5μA  

The extremely low reverse leakage current reduces interference with normal circuit operation, improving overall circuit efficiency and stability.

Slkor Transient Protection Diode SMBJ28CA specification

Peak Pulse Current (Ipp) @ 10/1000μs: 13.2A  

The SMBJ28CA can handle a peak pulse current of up to 13.2A at a pulse width of 10/1000μs, demonstrating its excellent transient current handling capability and providing strong protection for the circuit.

Maximum Clamping Voltage: 45.4V  

In the event of a transient overvoltage, the SMBJ28CA quickly clamps the voltage to a safe level (up to 45.4V), ensuring that subsequent circuit components are not damaged.

Peak Pulse Power (Ppp) @ 10/1000μs: 600W  

The SMBJ28CA can withstand up to 600W of peak pulse power at a pulse width of 10/1000μs, further proving its excellent ability to handle transient power and providing more reliable protection for the circuit.

Parameters of Slkor Transient Protection Diode SMBJ28CA

2. How Does the Bidirectional Protection of the SMBJ28CA Work?

The bidirectional protection feature of the SMBJ28CA transient voltage suppressor diode is achieved through its unique bidirectional polarity design. This design allows the SMBJ28CA to effectively respond to and suppress transient overvoltages in both directions, protecting the circuit from damage.

Specifically, the SMBJ28CA has a wide breakdown voltage range of 31.1V to 35.8V. This means that when the voltage in the circuit exceeds this range, the SMBJ28CA will begin to work, directing the overvoltage to the ground and protecting other components in the circuit. Notably, this breakdown voltage range is bidirectional, so whether the overvoltage is in the positive or negative direction, the SMBJ28CA will respond.

Furthermore, the SMBJ28CA has a high clamping voltage of 45.4V. When a transient overvoltage exceeds the diode's breakdown voltage range, the SMBJ28CA quickly clamps it below the clamping voltage, ensuring that other components in the circuit are not damaged by overvoltage. Again, this clamping voltage function is bidirectional, meaning the SMBJ28CA can effectively clamp overvoltage to a safe range in both directions, whether the overvoltage is positive or negative.

Thus, when transient overvoltage appears in either the positive or negative direction in the circuit, the SMBJ28CA will quickly respond and suppress it within a safe range, protecting the circuit from damage. This bidirectional protection feature makes the SMBJ28CA more adaptable to various transient voltage threats in complex circuit environments, providing reliable protection for stable circuit operation.

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.