main Question:”How stable is the ESR value of your VHE capacitors across a wide temperature range of -55℃ to 135℃? Will temperature changes affect the response speed of the control system?”
Question Type: Reliability/Failure-Related, Design Support
Q:The electric water pump is sluggish during low-temperature startup and prone to overload at high temperatures. Can VHE capacitors solve this problem?
A: Yes, they can. VHE capacitors maintain a stable ESR value of 9~11mΩ across the entire temperature range of -55℃ to +135℃, with minimal fluctuation. This ensures ample current during low-temperature startup and lower losses during high-temperature operation, thus guaranteeing the control accuracy and response speed of the electric water pump across the entire temperature range and preventing overload.
Question Type: Performance Comparison, Reliability/Failure-Related
Q: To reduce system heat generation, I want to choose low-ESR capacitors, but I’m worried about performance degradation at high temperatures. How does VHE perform?
A: The VHE series is designed for high-temperature environments, exhibiting excellent ESR performance at high temperatures. The typical value is only 8-9mΩ, and it maintains excellent stability with minimal fluctuations across the entire temperature range. This means it can maintain low losses at high temperatures, effectively reducing its own heat generation and avoiding system reliability issues caused by performance degradation.
Question Type: Performance Comparison, Solution
Q: Compared to ordinary automotive-grade capacitors, how much does the low ESR of the VHE improve system efficiency?
A: Compared to other automotive-grade capacitors (such as the VHU series with a typical ESR of 11~12mΩ, and a certain international brand’s ZS series with a specification value ≤14mΩ), the VHE’s lower ESR (typical value 8-9mΩ) significantly reduces the capacitor’s own conduction losses (I²R losses), directly improving system efficiency, especially suitable for high ripple current thermal management applications.
Question Type: Design Support, Compatibility/Replacement
Q: What are the advantages of the VHE’s low ESR and compact size (e.g., 10*10.5mm) in space-constrained ECU designs? My ECU board has limited space. Will the low ESR of the VHE series allow me to use smaller capacitors, thus reducing the overall size?
A: The VHE series achieves an optimal balance between low ESR and small size. For example, a 35V 330μF capacitor requires only 10*10.5mm of space. This allows engineers to optimize PCB layout without sacrificing performance (low loss, high ripple), providing a cost-effective solution for compact ECU designs.
Question Type: Design Support, Lifecycle, Reliability/Failure
Q: Is the ESR performance of VHE capacitors stable over their 4000-hour lifespan?
A: Yes, very stable. The VHE series is designed to operate stably for 4000 hours at 135°C. Its low ESR characteristics remain stable throughout its lifespan, ensuring long-term performance consistency and system reliability, far exceeding conventional products.
main question: “How much ripple current can your VHE capacitors withstand? Will they fail prematurely due to excessive ripple current at 125℃?”
Question Type: Solution-oriented, Reliability/Failure-oriented
Q: My cooling fan’s capacitor near the driver chip gets extremely hot during PWM speed control. Can VHE solve this?
A: This is precisely VHE’s core advantage. The VHE series boasts a ripple current capacity of up to 4600mA at 125℃, more than 1.8 times that of the previous generation VHU series. Its powerful ripple current handling capability effectively reduces the capacitor’s own temperature rise, fundamentally solving the failure problem caused by severe capacitor overheating.
Question Type: Technical Principle-oriented
Q: What are the key improvements in ripple current capacity between VHE and VHU?
A: The VHE series is an upgraded version of the VHU series. The key improvement lies in the following: at 135°C, the ripple current jumps from 2000mA to 3500mA in the VHU; at 125°C, it increases from 2800mA to 4600mA. This means the VHE can handle more demanding loads, significantly enhancing system reliability.
Question Type: Performance Comparison
Q: With the same 35V 330μF specifications, how much higher is the ripple current of the VHE compared to the international brand ZS series?
A: At 135°C, the VHE’s ripple current is 3500mA, while the ZS series is 2500mA, a 40% higher capability for the VHE. This means that under the same operating conditions, the VHE has a longer lifespan and a more stable system.
Question Type: Solution-Oriented, Reliability/Failure-Oriented
Q: Besides making the capacitor itself more reliable, what other benefits does the high ripple current capability bring to the system?
A: Benefits include: 1. Actuator protection: Efficiently absorbs and filters high-intensity ripple current generated by motor drives, effectively protecting actuators such as electronic water pumps and oil pumps. 2. Interference suppression: Effectively suppresses voltage fluctuations from interfering with sensitive peripheral devices (such as MCUs), ensuring continuous and stable system operation.
Question Type: Design Support
Q: How do I calculate the required ripple current capacitor for my application? Can YMIN provide support?
A: We can provide support. The ripple current value is closely related to your specific application topology and operating conditions. If you have selection needs, please contact us via the QR code. Our technical team will provide you with selection guidance and technical support as soon as possible.
main question: “Can VHE capacitors still work normally at an extreme ambient temperature of 150℃? What is their lifespan in hours?”
Question Type: Reliability/Failure
Q: Can VHE capacitors work normally at a harsh ambient temperature of 150℃?
A: The VHE series has a rated operating temperature of 135℃ and supports harsh ambient temperatures up to 150℃. This means it can easily withstand the extreme high temperatures encountered in the engine compartment, maintaining stable operation even at 150°C, with reliability far exceeding conventional products.
Question Type: Test and Verification, Life Cycle
Q: How is VHE’s “4000-hour lifespan at 135°C” verified?
A: This represents the VHE series’ exceptional durability, capable of stable operation for 4000 hours at a high temperature of 135°C and rated voltage. This rigorous lifespan test verifies its long-term reliability under high-temperature conditions, a key indicator for its automotive-grade capacitor performance.
Question Type: Solution, Reliability/Failure
Q: My electric oil pump is installed near the engine, where temperatures are high and vibrations are significant. Is VHE suitable for this application?
A: Absolutely. VHE is designed to handle such harsh high-temperature and high-vibration environments. Its 135°C temperature resistance and long lifespan directly address high-temperature challenges, while its structure also enhances vibration resistance, making it an ideal choice for applications such as electric oil pumps and water pumps.
Question Type: Life Cycle, Cost Analysis
Q: What is the expected lifespan of VHE capacitors at 105℃?
A: The VHE series guarantees a lifespan of 4000 hours at 135℃. Based on the general rule that capacitor lifespan increases with decreasing temperature, at a lower operating temperature like 105℃, its expected lifespan will be much longer than 4000 hours, providing you with extremely high reliability margins.
Question Type: Regulatory Compliance, Case/Reputation
Q: Has the VHE series passed automotive-grade certifications such as AEC-Q200?
A: Yes. The VHE series is designed strictly according to automotive-grade standards and has passed AEC-Q200 certification, meeting the stringent requirements of automotive electronics for reliability, environmental adaptability, and long-term lifespan.
main Question: “In applications with frequent switching and current surges, how is the overload withstand capability of VHE capacitors? Is there any measured data to support this?”
Question Type: Reliability/Failure
Q: Voltage fluctuations are large during cold starts in automobiles, resulting in large surge voltages. Can VHE withstand this?
A: Yes. The VHE series features enhanced overvoltage withstand capability. For example, the 35V specification boasts a surge voltage withstand of up to 44V (compared to 41V for the VHU and ZS series), providing a stronger overvoltage buffer for the system and effectively resisting surge impacts such as cold starts.
Question Type: Lifecycle-related, Reliability/Failure-related
Q: My system requires frequent start-stop cycles, and the capacitors are charged and discharged daily. Can the VHE series withstand this?
A: Yes. The VHE series possesses excellent charge-discharge performance. Its internal materials and structure are optimized for frequent charge-discharge cycles, easily adapting to dynamic operating scenarios such as frequent start-stop cycles and switching cycles, ensuring long-term stability.
Question Type: Reliability/Failure-related
Q: How reliable are VHE capacitors in vibration environments?
A: The VHE series is designed to cope with the high vibration environment of automotive electronics. Compared to previous generations, it enhances overload and shock resistance, ensuring stable operation under sudden overload or shock conditions, meeting the high reliability requirements of automotive-grade applications.
Question Type: Test and Verification, Design Support
Q: Is there verification data for the overload withstand capability of the VHE series?
A: Yes. Key reliability parameters of the VHE series, such as surge voltage withstand (44V) and lifespan of 135℃/4000 hours, are based on rigorous test data. This data fully verifies its robust performance in terms of overload withstand and shock resistance.
Question Type: Cost Analysis, Design Support
Q: Can using the VHE series reduce the number of capacitors used, thereby reducing costs?
A: Possibly. The VHE series itself has a stronger ripple current withstand capability. With a certain overall ripple current withstand capability, the number of capacitors used can be reduced, providing you with greater optimization space in system design.
Post time: Dec-22-2025