Slkor Microelectronics, an innovation leader in the basic semiconductor device sector, announced today the expansion of its ESD protection diode product line with the launch of the SM03C electrostatic protection diode, designed specifically for wireless communication applications. This new device, packaged in a standard SOT-23 format, aims to provide superior ESD protection and RF interference filtering for applications such as smartphone RF interfaces, IoT device antenna connections, Bluetooth/Wi-Fi modules, and industrial wireless sensors.

The newly launched SM03C features a 3.3V reverse working voltage (VRWM) and a 4V minimum breakdown voltage (VBR min), perfectly suited for the low-voltage requirements of modern wireless communication systems. Its core advantage lies in the ultra-low clamping voltage of 7.5V (VC), which can quickly and effectively divert harmful electrostatic discharge energy to ground. Notably, the 450pF junction capacitance (CJ) not only provides reliable ESD protection but also functions as an effective RF filter to reduce signal interference in the wireless frequency bands.

Innovative Technology Tackles the Dual Challenges of Wireless Communication

ESD protection diodes safeguard critical components in electronic systems by absorbing and dissipating the high energy generated by electrostatic discharge. In modern wireless communication devices, such protection is crucial for components such as system-on-chips (SoCs), RF front-end modules, and other sensitive devices. However, adding protection devices to high-speed wireless data lines may affect signal transmission quality. Thus, choosing devices that offer adequate protection without significantly compromising signal integrity is crucial for wireless communication system designs.

With its extensive expertise in ESD protection solutions, Slkor Microelectronics has achieved this balance through the SM03C. The device features an innovative structural design that retains a 450pF junction capacitance while offering a 7.5V low clamping voltage and a 40μA low reverse leakage current (IR). This unique design allows the SM03C to:

Provide effective protection for wireless signals in the 2.4GHz/5GHz frequency bands

Reduce high-frequency signal attenuation

Suppress out-of-band noise interference

Lower overall system power consumption

“As wireless communication devices become increasingly compact, designers face the dual challenge of achieving reliable protection and maintaining signal integrity in limited space,” said the product manager at Slkor Microelectronics. “The introduction of the SM03C addresses this challenge by offering excellent ESD protection, while its built-in filtering features help simplify system design and reduce the need for external components.”

Optimized Design Enhances System Performance

The SM03C is packaged in a standard SOT-23 format, making it easy to integrate into various wireless devices. This package offers excellent thermal performance and meets the miniaturization requirements of modern electronic products. Key technical features of the device include:

1. Precise Voltage Protection: 3.3V VRWM and 4V VBR min for accurate protection of low-voltage wireless systems

2. Fast Response: Nanosecond-level response time effectively intercepts transient voltage spikes

3. Low Power Consumption: 40μA reverse leakage current helps extend the battery life of portable devices

4. Integrated Filtering Function: 450pF junction capacitance provides natural RF filtering characteristics

5. Wide Temperature Range: Operating temperature range of -55°C to +125°C to suit various environmental conditions

These features make the SM03C ideal for the following applications:

Antenna interface protection for smartphones and tablets

Wireless connection protection for IoT devices

ESD protection for Bluetooth headsets and wearable devices

Interface protection for industrial wireless sensor networks

Signal integrity maintenance in drone communication systems

Technological Advantages and Real-World Performance

In practical testing, the SM03C has demonstrated excellent performance:

In IEC 61000-4-2 standard tests, it effectively withstands ±8kV contact discharge and ±15kV air discharge

At a 2.4GHz operating frequency, signal attenuation is controlled to within -0.3dB

It offers more than 15dB suppression of out-of-band interference above 5GHz

Dynamic resistance is below 1Ω, ensuring rapid energy dissipation

As wireless communication technology rapidly evolves and application scenarios continue to expand, the demand for reliable protection solutions will continue to grow. With the release of the SM03C ESD protection diode, Slkor Microelectronics offers the industry a high-performance, high-reliability option to help wireless device manufacturers enhance product quality and user experience.

About Slkor：

SLKOR, headquartered in Shenzhen, China, is a rapidly emerging national high-tech enterprise in the power semiconductor sector. With R&D centers in Beijing and Suzhou, its core technical team originates from Tsinghua University. As an innovator in silicon carbide (SiC) power device technology, SLKOR's products are widely used in new energy vehicles, photovoltaic power generation, industrial IoT, and consumer electronics, providing critical semiconductor solutions to over 10,000 clients globally. The company delivers more than 2 billion units annually, with its SiC MOSFETs and 5th-generation ultrafast recovery SBD diodes setting industry benchmarks in efficiency ratio and thermal stability. SLKOR holds over 100 invention patents and offers 2,000+ product models, continually expanding its IP portfolio across power devices, sensors, and power management ICs. Certifications including ISO 9001, EU RoHS/REACH, and CP65 compliance demonstrate the company's steadfast commitment to technological innovation, lean manufacturing, and sustainable development.