In AI servers, SSDs are the core components for data storage and retrieval, and their performance directly determines the efficiency of AI model training and inference. With the widespread adoption of PCIe 5.0/6.0 interfaces, the power consumption and instantaneous current requirements of SSDs have increased significantly, making the selection of Power Loss Protection (PLP) capacitors crucial for ensuring system stability. Especially under the harsh operating conditions of AI servers—high temperature, high load, and 24/7 continuous operation—PLP capacitors must simultaneously meet multiple core indicators such as low ESR, high capacitance density, long lifespan, and high-temperature stability. Improper selection can easily lead to serious problems such as data loss, firmware corruption, or even system crashes.

Why Capacitor Selection Directly Affects SSD Performance and Lifespan

In the instant of a sudden power outage, the PLP capacitor needs to release the stored energy within milliseconds to ensure the safe storage of data to be written into the NAND flash memory. If the capacitor's ESR is too high, a large voltage drop will occur during discharge, directly causing data write failure. If the capacitor's capacity is insufficient, or its capacitance decays severely under high temperatures, it cannot provide enough hold time for data writing. Furthermore, for compact M.2 SSDs (such as 5mm thick models), the internal capacitor mounting height is often limited to below 1.9mm. The capacitor's volumetric efficiency (CV value) directly determines whether sufficient energy storage can be achieved within a limited space to meet the core requirement of power-loss protection.

Yongming's Dedicated Capacitor Solution Breaks Through AI Storage Bottlenecks

Addressing the diverse needs of AI server SSDs, Shanghai Yongming Capacitors has launched two core PLP capacitor solutions, each adaptable to different design requirements and application scenarios, comprehensively meeting the storage hardware needs of the AI ​​era.

Solution A: Conductive Polymer Tantalum Electrolytic Capacitors – A Benchmark for Ultimate Space Performance

Yongming's TQD series conductive polymer tantalum electrolytic capacitors, with their ultra-thin design, perfectly fit the space constraints of ultra-thin M.2 SSDs. Their height can be as low as 1.5mm, making them an ideal choice for solving the problem of energy storage in small spaces. This product series boasts a high CV value of 1.0μF/mm³, coupled with excellent high-temperature stability. Even within a very small size, it provides ample power-loss protection energy for SSDs, ensuring stable operation under continuous high-temperature and high-load conditions.

Furthermore, the TQD series adopts a new all-solid-state, full-size structure, exhibiting robust durability. It has an expected lifespan exceeding 100,000 hours at 75°C and has passed rigorous dual 85°C constant temperature and humidity tests, maintaining stable performance even under long-term high-temperature and high-humidity conditions. Actual test data shows that the capacitance and equivalent series resistance (ESR) of this series of capacitors change minimally with time and temperature, providing continuous and reliable power-loss protection for SSDs. Simultaneously, the product employs multiple moisture-proof measures, and the all-solid-state design also gives it excellent long lifespan and high weather resistance, perfectly matching the operational requirements of AI servers.


Solution B: Polymer Hybrid Aluminum Electrolytic Capacitors – The Preferred Choice for High Reliability and Cost-Effectiveness

For enterprise-level SSDs requiring larger capacities, Yongming's polymer hybrid aluminum electrolytic capacitors are the preferred solution due to their superior cost-effectiveness. This capacitor boasts an exceptionally long lifespan of 10,000 hours at 105℃, fully meeting the 24/7 operational requirements of AI servers. Even in environments with significant temperature variations, it maintains low ESR and excellent capacity stability, ensuring effective power-loss protection.

Regarding system security, this capacitor operates on an "open circuit" failure mode. Compared to short-circuit failure, this provides greater security redundancy for high-value data storage systems, reducing the risk of system failure. In terms of cost, this capacitor significantly optimizes BOM costs while achieving performance comparable to similar products, making it a high-performance, cost-effective choice for mainstream and large-capacity enterprise-grade SSDs.

A Comparison of Two Key Solutions for Precise Matching of Design Needs

Yongming's conductive polymer tantalum electrolytic capacitors and polymer hybrid aluminum electrolytic capacitors are currently the mainstream PLP capacitor choices for AI server SSDs. Each product has its advantages, with significant differences in core characteristics:

In terms of volumetric efficiency (CV), tantalum electrolytic capacitors reach 1.0μF/mm³, an extremely high level, making them the first choice for ultra-compact designs. Aluminum electrolytic capacitors, on the other hand, offer 0.46μF/mm³, also possessing high volumetric efficiency. Regarding finished product height, tantalum electrolytic capacitors can be as low as 1.5mm, eliminating the need for PCB slotting. Small-diameter aluminum electrolytic capacitors, when mounted horizontally, have a height of approximately 3.55mm, requiring PCB slotting. In terms of equivalent resistance (ESR), both... Both products exhibit low resistance, with aluminum electrolytic capacitors showing superior instantaneous discharge capability and response performance.

Regarding lifespan, the all-solid-state structure of tantalum electrolytic capacitors grants them an exceptionally long lifespan, while the solid-liquid hybrid system of aluminum electrolytic capacitors also contributes to this. Both meet the long-term operational requirements of AI servers, with tantalum electrolytic capacitors offering a theoretically superior lifespan. In terms of temperature characteristics, both products perform exceptionally well, with minimal changes in capacitance and ESR with temperature, maintaining stable operation even at high temperatures.

Regarding failure modes, tantalum electrolytic capacitors fail due to short circuits, requiring appropriate circuit protection designs, while aluminum electrolytic capacitors fail due to open circuits, resulting in lower system operational risk. Finally, aluminum electrolytic capacitors offer a significant cost advantage, effectively reducing overall hardware costs.

From typical specifications, the Yongming TQD 35V 47μF tantalum capacitor (7.3*4.3*1.5) and the NGY solid-liquid hybrid aluminum electrolytic capacitor... The core parameters of the 35V 100μF (5*11) capacitors also differ: both have a surge voltage of 41V and support an operating voltage of 35V; the peak withstand voltage (transient) of the tantalum capacitor is 47.3V, while that of the aluminum electrolytic capacitor is 55V; in terms of capacitance tolerance, the tantalum capacitor is ±20%, with a typical capacitance of approximately 42μF, while the aluminum electrolytic capacitor is ±10%, with a typical capacitance of approximately 105μF;

Regarding dimensions, the tantalum capacitor measures 7.3x4.3x1.5mm with a height of only 1.5mm, while the aluminum electrolytic capacitor measures ø5.0x11.5mm with a horizontal mounting height of 5.0mm; both have an operating temperature range of -55°C to +105°C, with the tantalum capacitor exhibiting a lifespan exceeding 2 years at 105°C. The lifespan of tantalum capacitors is over 10,000 hours at 105°C and over 80,000 hours at 75°C.

At the end of their rated lifespan, the lower limit of capacitance for tantalum capacitors is over 90% of the initial value, while for aluminum electrolytic capacitors it is over 85%. Regarding the capacitance change with temperature, tantalum capacitors exhibit a change of -5% to +20% in the -55°C to +105°C range, while aluminum electrolytic capacitors exhibit ±7%. In terms of charge/discharge tolerance, both types of capacitors retain over 90% of their initial capacitance after 20,000 charge/discharge cycles. In terms of cost, the material cost plus system cost of aluminum electrolytic capacitors is only about 15% of that of tantalum capacitors, resulting in an overall cost reduction of approximately 85%.

Scenario-Specific SSD Selection Recommendations for Precise Adaptation

Based on the design characteristics and application scenarios of different SSDs, Ymin also provides targeted PLP capacitor selection suggestions to make the selection more specific:

1. Ultra-thin M.2 SSD (5mm thick): Prioritize conductive polymer tantalum electrolytic capacitors. This is currently the only capacitor solution that can provide high capacity in millimeter-level thickness. The reference specification is TQD 35V 47μF (1.5mm high);

2. High-performance AI server SSD: Conductive polymer tantalum electrolytic capacitors are recommended. Their long lifespan and high reliability characteristics are highly compatible with the operating requirements of servers and can meet the server's warranty period. The reference specification is TQD 35V 47/68μF;

3. Mainstream/Cost-Sensitive SATA SSD: Suitable for selection is polymer hybrid aluminum electrolytic capacitor, which can achieve the best cost performance while ensuring the basic reliability and lifespan of the device. The reference specification is NGY 35V 100μF;

4. Large-capacity enterprise-grade U.2 SSD: Two options are available. For top-tier performance, choose conductive polymer tantalum electrolytic capacitors; for high cost-effectiveness, choose polymer hybrid aluminum electrolytic capacitors. Customized solutions can be tailored to the customer's specific cost and performance goals.

Q&A: The Core Selection Logic for the Two Types of Capacitors

**Q:** How to choose between conductive polymer tantalum electrolytic capacitors and polymer hybrid aluminum electrolytic capacitors?

**A:** The core choice depends on the design and application requirements of the SSD. If the SSD design faces extreme space constraints (e.g., ultra-thin M.2) and has top-tier requirements for high-temperature stability and long lifespan, Yongming conductive polymer tantalum electrolytic capacitors are the ideal choice. If the SSD design has some layout space, and the core requirement is to achieve the best balance between reliability and total system cost, while favoring a safer "open circuit" failure mode, then Yongming polymer hybrid aluminum electrolytic capacitors are the better solution.

Conclusion

As a professional brand in the capacitor field, Yongming has created two core product series: conductive polymer tantalum electrolytic capacitors and polymer hybrid aluminum electrolytic capacitors, precisely covering the diverse needs of AI server SSDs. Whether it's a space-constrained ultra-thin SSD or an enterprise-grade SSD requiring high capacity and high power, YMIN can provide professional and reliable capacitor selection advice to help customers find the best balance between performance, cost, and reliability.