In today’s digital age, electronic devices have become deeply integrated into our daily lives and work. From smartwatches recording health data to automation systems efficiently operating in large factories, the backbone of these advancements lies in electronic circuits. However, these circuits face an invisible threat – transient voltage. Like an unseen surge, it can strike unexpectedly, damaging the circuit and causing equipment failure. Fortunately, the SMAJ24A transient voltage suppression diode provides a “protective umbrella” for circuit safety.

1. Unique Features: The Cornerstone of Circuit Protection

The SMAJ24A is a unidirectional transient voltage suppression diode with a reverse working voltage (Vrwm) of 24V, which serves as the “safety threshold” for safeguarding the circuit. Under normal conditions, when the circuit voltage is below 24V, the SMAJ24A acts as a quiet guardian in a high-resistance state, consuming negligible power and not interfering with the circuit’s operation. However, when the voltage climbs into the breakdown range of 26.7V to 29.5V, it quickly reacts by switching from the high-resistance state to a low-resistance state, entering conduction mode.

Slkor Transient Protection Diode SMAJ24A product photo

Once in conduction mode, the SMAJ24A reveals its strengths. With a reverse leakage current (Ir) of just 5μA, its impact on the circuit’s power consumption is minimal during normal operation. In the face of transient voltage surges, it can withstand significant current, with a peak pulse current (Ipp) of 10.3A under a 10/1000μs waveform, capable of handling instantaneous high-current shocks. At the same time, its maximum clamping voltage of 38.9V ensures that voltage peaks remain within a safe range, protecting sensitive components. Its peak pulse power (Ppp) of 400W equips it with strong transient energy absorption capacity, quickly dissipating dangerous energy and ensuring circuit stability.

Slkor Transient Protection Diode SMAJ24A specification

Parameters of Slkor Transient Protection Diode SMAJ24A

2. Operating Mechanism: Precision and Efficient Protection Logic

The operating principle of the SMAJ24A is based on its unique semiconductor structure. Under normal conditions, the PN junction is in a reverse cutoff state, allowing only a slight reverse leakage current. Once a transient overvoltage occurs, the voltage rises rapidly to the breakdown voltage, causing avalanche breakdown of the PN junction, and triggering the excitation of a large number of charge carriers, instantly creating a low-resistance path. At this moment, transient current flows through the SMAJ24A, limiting the circuit voltage to below the maximum clamping voltage. Once the danger passes, the diode quickly returns to its high-resistance cutoff state, restoring normal circuit operation. This rapid response and recovery capability is key to its role in safeguarding the circuit.

3. Wide Applications: Safety Assurance Across Multiple Fields

Consumer Electronics: A Reliable Protector for Everyday Devices
In daily life, devices such as smartphones and tablets often experience electrostatic discharge and power surges, especially at charging and data transmission ports. For instance, when a phone charger is plugged or unplugged during dry winter months, static electricity can cause a transient overvoltage, potentially damaging internal circuits. By installing the SMAJ24A at the interface, the overvoltage is swiftly suppressed, ensuring the safety of phone chips and circuits for a worry-free user experience.

Automotive Electronics: A Strong Support for Vehicle Safety  

In automotive systems, the electrical system faces a complex electromagnetic environment. Pulse interference from the ignition system, lightning strikes, and sudden fluctuations in battery voltage can harm automotive electronics. The SMAJ24A plays a vital role in electronic control units (ECUs), sensors, and lighting circuits. When a vehicle is struck by lightning, the SMAJ24A can quickly clamp excessive voltage, protecting critical components like the ECU, ensuring safe operation and performance of the vehicle.

 
Industrial Automation: A Guardian of Production Stability  

In industrial automation production lines, frequent motor startups, equipment power cycles, and other operations generate significant transient voltage. Without proper control, key equipment such as programmable logic controllers (PLCs) and industrial robot control systems could malfunction. For example, voltage fluctuations during motor startup on an automated production line may cause a PLC to misoperate, disrupting production. The SMAJ24A, when installed in critical circuits, effectively suppresses these transient voltages, ensuring stable operation and enhancing production efficiency.

Comparison Advantages: The Standout in Circuit Protection

Compared to traditional varistors, the SMAJ24A reacts faster, providing quicker response times to transient voltage and protecting the circuit more effectively. Additionally, its leakage current is minimal, and its performance remains stable over time, unlike varistors, which degrade with prolonged use and increased leakage current. Compared to gas discharge tubes, the SMAJ24A offers a lower clamping voltage, providing more precise protection for voltage-sensitive electronic components and preventing damage due to excessive voltage.

In conclusion, the SMAJ24A stands out with its exceptional performance and reliable protective capabilities, occupying a crucial role in the field of electronic circuit protection. As electronic technology continues to advance, the demand for circuit protection will only increase. The SMAJ24A and similar products will continue to safeguard the development of electronic technology, ensuring more stable and reliable operation of electronic devices.

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.