SN6

SN6 Series: Long-Lasting, Durable Aluminum Electrolytic Capacitors for Demanding Industrial Applications

In modern industrial power electronics, the choice of capacitor directly impacts the stability, efficiency, and lifespan of the entire system. Designed as a standard product specifically for harsh industrial environments, the SN6 series aluminum electrolytic capacitors, with their long lifespan of up to 6,000 hours at 85°C, excellent electrical performance, and high reliability, have become indispensable components in core equipment such as inverters, servo drives, and industrial power supplies. Not only do they comply with stringent RoHS environmental directives, but their exceptional performance embodies the true meaning of "industrial-grade quality."

I. Product Overview and Core Positioning

The SN6 series is an aluminum electrolytic capacitor in a standard package. Its most significant advantage lies in its long-life design. At a rated operating temperature of 85°C, these products are guaranteed to operate continuously for 6,000 hours, providing a solid foundation for industrial equipment that requires long, uninterrupted operation. With a wide operating voltage range of 16V to 500V DC and a capacitance range from 82μF to 22000μF, the SN6 series meets a wide range of circuit requirements, from low-power control to high-power energy conversion.

This product series strictly adheres to lead-free environmental standards and fully complies with the RoHS Directive, demonstrating the company's commitment to environmental protection and social responsibility. Designed to withstand the challenges of industrial applications, such as frequent load changes, high ripple current stress, and a certain degree of mechanical vibration, it is an ideal choice for engineers designing high-reliability power supplies, inverters, and filter circuits.

II. In-Depth Analysis of the Product's Core Technical Features

1. Superior Long Life and Durability

The SN6 series' 6000-hour lifespan test is conducted under the most stringent conditions: 3000 hours at 85°C, with rated voltage and rated ripple current. After testing, the capacitance change (ΔC) did not exceed ±20% of the initial value, the loss tangent (tgδ) did not exceed 200% of the initial specification, and the leakage current remained well within the initial specification. These "three no-exceedance" characteristics ensure minimal performance degradation of the capacitors after long-term use, effectively extending the service life of the entire equipment, reducing maintenance costs and the risk of failure.

2. Robust Electrical Performance

• Low Loss and High Ripple Current Capacity: The SN6 series features low equivalent series resistance (ESR), which reduces losses and heat generation at high frequencies. Furthermore, its high rated ripple current capability enables it to effectively smooth high-frequency ripple components in power supplies, which is particularly important in the DC bus circuits of inverters and servo drives, stabilizing bus voltage and suppressing harmonic interference.

• Strict Capacity Stability: At -25°C, the ratio of the product's capacitance to its capacitance at +20°C is greater than 0.6, ensuring stable performance during low-temperature startups or ambient temperature fluctuations.

• Reliable Insulation and Safety Features: The insulation resistance between all terminals and the pins with insulating sleeves exceeds 100MΩ, and they can withstand a 2000V AC insulation voltage test for one minute without any problems, providing a high level of safety protection for equipment and operators.

3. Compact Construction and Easy Installation

The design is a highlight of the SN6 series. This structure allows the capacitor to quickly and securely "snap" into pre-drilled holes on printed circuit boards, simplifying automated assembly processes and significantly improving production efficiency. Its compact cylindrical form factor optimizes PCB space utilization, facilitating miniaturization of equipment. Furthermore, the robust mechanical connection enhances vibration resistance, making it suitable for complex industrial environments.

4. Wide Environmental Adaptability

The SN6 series features a wide operating temperature range for different voltage levels. The 16V to 100V products operate from -40°C to +85°C, while the 160V to 500V products operate from -25°C to +85°C, covering the vast majority of industrial applications. Furthermore, the product is specified to have a high-temperature storage life of up to 1,000 hours, maintaining excellent performance even after storage or equipment downtime, ensuring product readiness and long-term storage reliability.

III. In-Depth Analysis of Typical Application Scenarios

The characteristics of the SN6 series capacitors make them highly effective in several key industrial sectors:

• Variable Frequency Drive (VFD) Applications: In VFDs, SN6 capacitors are commonly used as DC bus capacitors. Their primary function is to absorb pulsating current from the rectifier bridge, providing a smooth and stable DC voltage source for the inverter (IGBT). Their high ripple current capability and long lifespan directly impact the stability and service life of VFDs facing frequent motor starts and stops and severe load fluctuations.

• Servo Drive Systems: Servo systems require extremely high dynamic response and precision. SN6 capacitors perform filtering and energy buffering in the servo drive's power supply. When the servo motor requires instantaneous high torque output, the capacitors quickly release stored energy to support stable motor operation. During braking, they absorb feedback energy to ensure system voltage stability.

• Industrial switching power supplies: As a key filtering component at the output of switching power supplies, SN6 capacitors effectively filter high-frequency switching noise, providing pure DC power. This clean power supply powers precision control units such as PLCs, industrial computers, and sensors, ensuring the stability and reliability of the entire control system.

• Uninterruptible power supplies and renewable energy: In renewable energy equipment such as UPSs, photovoltaic inverters, and wind turbine converters, SN6 capacitors also play a key role in energy buffering and filtering, helping to improve energy conversion efficiency and grid-friendliness.

IV. Engineering Guidance of Frequency and Temperature Correction Factors

The SN6 series provides clear frequency and temperature correction factor tables, which are highly valuable for engineers to guide precise selection and thermal design. For example, at a 50Hz operating frequency, the ripple current rating must be multiplied by a factor of 0.8; at high frequencies above 10kHz, this factor increases to 1.4. This means that in high-frequency applications, the same capacitor can withstand higher ripple currents. Similarly, when the ambient temperature drops from 85°C to 40°C, the correction factor increases from 1.0 to 1.7, indicating that under improved heat dissipation conditions, the capacitor's current-carrying capacity is significantly improved. This provides engineers with a scientific basis for optimizing designs and unlocking the potential of devices.

V. Conclusion: The Cornerstone of Reliability

In summary, the SN6 series aluminum electrolytic capacitors are more than just simple electronic components; they are the cornerstone of modern industrial equipment's high efficiency, reliability, and long life. Their rigorous design, solid materials, comprehensive testing, and extensive application validation ensure they can withstand a variety of demanding industrial challenges. Choosing SN6 means choosing a commitment to long-lasting quality, providing strong support for building a stable and powerful industrial power core. Whether for equipment upgrades or new product development, the SN6 series is a trustworthy partner.