Introduction

In this review, we will present an in-depth analysis and comparison of the T491D476M025AT Capacitor manufactured by KEMET (part number: T491D476M025AT) against a statistical benchmark formed from other components of the same value. The primary objective is to make suggestions to electronics engineers whether using this capacitor would be beneficial for their specific projects or applications. The capacitor is a Tantalum: Molded type, Surface Mount device housed in a 2917 (7343 Metric) package.

Please find a summarized list of the key advantages and drawbacks of the T491D476M025AT Capacitor below:

• Pros:
• Excellent low ESR at high frequencies
• High stability over a wide operating temperature range
• Superior voltage rating: up to 25 V
• Compatibility with most high-density surface mount applications due to its compact package size


• Cons:
• High series resistance at low to mid frequencies
• Inherent negative temperature coefficient
• Rapid decline in capacitance after a certain frequency range, leading to inconsistencies in performance

This review is structured into four sections - Capacitance, Series Resistance, Dissipation Factor and Quality Factor, Comparative Analysis – that delve deeper into the performance of the T491D476M025AT Capacitor as well as comparisons with the statistics-based benchmark. The aim is to provide a comprehensive overview of the capacitor's real-world performance, taking into account both the positive and negative aspects, so you can make an informed decision.

Impedance

When comparing the T491D476M025AT's impedance measurements at 1 Volt to the statistical benchmark data, it becomes evident that at lower frequencies, such as 5Hz and 10Hz, this particular capacitor exhibits comparable impedance performance with respect to the benchmark (676.1 vs 656.9 Ohms at 5Hz and 341.4 vs 332.8 Ohms at 10Hz). As the test frequency increases, the capacitor's impedance begins to diverge from the statistical benchmark values. It is observed that at higher test frequencies of 1kHz and above, the impedance values are moderately lower than the benchmark data, potentially indicating enhanced capacitor efficiency in certain applications.

Similarly, when comparing the impedance measurements at 10 Volts, the T491D476M025AT's impedance values exhibit a congruent pattern with those observed at 1 Volt. However, at lower test frequencies like 5Hz and 10Hz, the actual impedance values are notably lower than the benchmark data, suggesting improved performance under elevated voltage conditions. As the test frequency increases, the impedance values tend to deviate more significantly from the statistical benchmark data but still display an improvement in efficiency at high frequencies when compared to the 1 Volt test results.

Considering its impedance performance, the T491D476M025AT may be a suitable option for engineers aiming to optimize efficiency in high-frequency applications. This capacitor's impedance characteristics show satisfactory performance across diverse test conditions, performing slightly better at higher test voltages. Nonetheless, the definitive compatibility of this component in a design will depend on the specific requirements of each individual circuit and application, necessitating a thorough evaluation of its impedance characteristics along with other relevant electrical properties in the context of the intended implementation.

Capacitance

In examining the KEMET T491D476M025AT Capacitor's capacitance performance, we will perform a direct comparison with a given statistical benchmark for similar Tantalum: Molded capacitors. This comparison allows readers to better understand the performance of the component under various conditions and see how it compares with industry standards.

Firstly, we analyze the LCR measurements by comparing data at 1 Volt and 10 Volts to the provided benchmark information. By evaluating the T491D476M025AT Capacitor's performance at different test frequencies, we can effectively discern the quality of the component in comparison to others in its class. Our analysis indicates that the average series capacitance for this Capacitor at lower test frequencies (5 Hz - 75 kHz) typically surpasses the average indicated by the benchmark data. As for higher test frequencies, from 100 kHz to 1 MHz, the series capacitance remains adequately within the acceptable range, tending to perform within the lower to middle portion of the statistical benchmark.

It is also important to evaluate the performance based on the minimum and maximum series capacitances. As with the average series capacitances, the KEMET T491D476M025AT Capacitor maintains a reasonable performance when comparing minimum and maximum values to the benchmark data. In most cases, it stays within the set margins. However, it is worth noting the sudden jump in series capacitance at higher frequency cases (850 kHz - 1 MHz). This slight deviation from the typical range presents an inconsistency in the performance that exceeds the statistical maximum by a considerable margin.

Overall, the KEMET T491D476M025AT Capacitor demonstrates a generally stable and acceptable capacitance performance when compared to the statistical benchmark. This makes it a reliable choice for applications that fall within the tested frequency range. However, potential users of this component should take into account the possible anomalies spotted in higher test frequencies, as these may impact the performance for specific use cases.

Series Resistance

The analysis of the series resistance performance of the KEMET T491D476M025AT capacitor, particularly in comparison to the statistical benchmark data, provides us with insightful information on its behavior at various frequencies and operating conditions. At 1 Volt test voltage, the capacitor reveals a higher series resistance at lower frequencies (5 Hz and 10 Hz) in comparison to the average component in the benchmark dataset. Yet, interestingly, the T491D476M025AT's series resistance performs more favorably as the test frequency rises, displaying a lower resistance value than the average benchmarked component. This impressive behavior spans across a wide range of frequencies, from 50 Hz up to 1 MHz.

Moving on to a higher test voltage of 10 Volts, the KEMET T491D476M025AT capacitor's series resistance follows a similar pattern. Its resistance at lower frequency ranges (5 Hz and 10 Hz) is seen to be higher compared to the average values observed in the benchmark. However, as the frequency increases, the capacitor's series resistance value drops below the average benchmark, effectively maintaining its reliability under diverse voltage conditions. The region where a lower series resistance is discerned for the T491D476M025AT stretches from 50 Hz to 1 MHz.

Through this comprehensive analysis, we can conclude that the KEMET T491D476M025AT capacitor displays a strong affinity for applications employing higher frequency domains, mainly attributable to its relatively lower series resistance at these frequency levels. Conversely, this component might not be the most suitable choice for applications operating predominantly at lower frequencies. This is due to the increased series resistance it demonstrates when compared to the statistical benchmark in these frequency bands.

Dissipation Factor and Quality Factor

One of the critical aspects to consider when evaluating the performance of the T491D476M025AT Tantalum Molded Capacitor is its Dissipation Factor (Df) and Quality Factor (Q) across various test frequencies ranging from 5 Hz to 1 MHz. In comparison to the statistical benchmark for capacitors in the same category, it demonstrates a varying degree of performance.

First, let's consider the LCR measurements at 1 Volt to better understand the capacitor's characteristics. In the lower frequency range, the capacitor exhibits favorable attributes. More specifically, at 5 Hz, it demonstrates a Df of 0.021 and a Q of 47.68, and at 10 Hz, it achieves a Df of 0.019 and Q of 53.00. These values imply that there are minimal energy losses at these frequencies. The performance improves as the frequency increases up to 50 Hz (Df of 0.016, Q of 60.94) and 100 Hz (Df of 0.017, Q of 59.32). However, the Dissipation Factor elevates significantly as the test frequency augments from 100 Hz to 1 MHz, resulting in reduced energy efficiency and Quality Factor.

When measuring at 10 Volts, analogous trends emerge. Although the capacitor exhibits a considerably higher Df of 1.751 at the lowest test frequency of 5 Hz (Q of 0.57), it maintains a relatively proficient performance in the range of 10 Hz to 100 Hz. It showcases its optimum values at 50 Hz and 100 Hz with Df figures of 0.166 and 0.037, respectively, and corresponding Q values of 5.98 and 26.83. However, akin to the 1-Volt measurements, the Dissipation Factor experiences a progressive climb with increasing frequencies, leading to the degradation of the Quality Factor.

Given these observations, the T491D476M025AT Capacitor demonstrates commendable characteristics in the lower frequency domain. Nevertheless, its performance declines substantially as the frequencies increase due to the escalating Dissipation Factor values. Consequently, it is crucial for engineers to thoroughly evaluate the suitability of this capacitor in their circuits, taking into account the occasional variance with the statistical benchmark data and the component's frequency-dependent efficiency. Proper assessment is paramount to ensuring optimal performance and suitable integration within electronic circuits.

Comparative Analysis

Conclusion

In conclusion, when comparing this KEMET T491D476M025AT with the statistical benchmark, it shows varied performance with respect to impedance, dissipation factor, quality factor, and series resistance. The capacitor displays low dissipation factors across lower frequencies which are on par with the benchmark data. However, at higher frequencies, the dissipation factor increases significantly, bringing its performance below the benchmark. Additionally, the quality factors for the KEMET capacitor are noticeably lower than the benchmark performance in most cases.

When it comes to impedance, the capacitor operates with similar values to the benchmark data across different frequencies, with slight variations in either direction. Its series resistance is significantly higher for lower frequency ranges and tends to differ increasingly as the test frequency increases. The series capacitance marginally correlates with the given statistical benchmark at different frequency tests, while the inductance values show large deviations at higher frequencies.

In summary, for electronics engineers assessing the applicability of this Tantarum: Molded capacitor in their circuits, its application would be dependent on the acceptable deviations from the benchmark values for your specific use case. It may perform suitably for low-frequency applications with low dissipation factors, but falter where high-quality factors and low series resistance is required. The resulting decision of integrating this KEMET T491D476M025AT into your circuit should be based on how well it aligns with the performance expectations set by the statistical benchmark data presented in this technical review.