Introduction

In this technical review, we will analyze the performance of a KEMET A755KS476M1EAAE025 Aluminum-Polymer Capacitor and compare it to a statistical benchmark formed from other capacitors with similar values. The KEMET A755KS476M1EAAE025 capacitor comes with a nominal value of 47μF, a tolerance of ±20%, and a rated voltage of 25V. Its composition features Aluminum-Polymer Polymer materials that are known for providing some advantages in terms of performance and stability. This review aims to offer a comprehensive analysis of the capacitor's performance for electronics engineers assessing its applicability for their circuits.

Pros:

• Promising low-frequency performance with reasonably high Quality Factor(Q);
• Stable series capacitance across various test frequencies;
• Overall low series resistance;
• Aluminum-Polymer construction allows for lower ESR and improved frequency characteristics compared to standard Aluminum Electrolytic capacitors.

Cons:

• Higher than desired dissipation factor at higher frequencies;
• Reduced performance and inconsistency in some measurements at frequencies above 200 kHz;
• Through-hole mounting may limit its suitability for high-density PCB applications.

Impedance

In this section, we will be analyzing the impedance performance of the A755KS476M1EAAE025 capacitor by comparing it to a given statistical benchmark in terms of impedance (Ohms) at 1 Volt. This comparison will give us a better understanding of how the capacitor performs across varying frequency ranges, aiding in understanding its applicability in different scenarios.

Beginning at a frequency of 5 Hz, the component's impedance of 659.3 Ohms slightly surpasses the average benchmark value of 656.9 Ohms, demonstrating a close performance to the reference standard. As the frequency increases to 10 Hz and 50 Hz, the A755KS476M1EAAE025 capacitor continues to demonstrate similarity in performance with measured impedance values of 331.5 and 67.19 Ohms, respectively, compared to the average benchmark values of 332.8 and 69.54 Ohms. This indicates that the capacitor maintains an almost consistent performance within lower frequency ranges.

Moving into higher frequency ranges, specifically from 300 kHz to 700 kHz, the capacitor's performance starts to diverge from the average benchmark values. For instance, the A755KS476M1EAAE025 capacitor exhibits an outstanding impedance of 17.35m Ohms at 300 kHz, significantly outperforming the benchmark of 289.3m Ohms. However, at the 1 MHz frequency, the capacitor encounters a limitation, resulting in a relatively high impedance of 69.52m Ohms compared to an average benchmark impedance of 286.2m Ohms.

Upon examining the LCR measurements under 10 Volts, the A755KS476M1EAAE025 capacitor demonstrates a similar pattern across the 5 Hz to 4 kHz frequency range, with the impedance measurements varying from 655.4 Ohms (5 Hz) to 1.01 Ohms (10 kHz). Notably, at 150 kHz, the capacitor's impedance of 16.36m Ohms is superior to the relevant benchmark, further verifying its robust performance at higher frequencies. Nevertheless, as observed in the impedance tests at 1 Volt, the capacitor's performance remains somewhat limited at the highest frequency of 1 MHz, with the impedance not being recorded in the given dataset. This may indicate potential restrictions in its applicability within high-frequency applications.

Capacitance

The A755KS476M1EAAE025 capacitor exhibits capacitance values that are very close to average when tested at 1V across an extensive range of frequencies. For instance, at 5 Hz, this capacitor measures a capacitance of 48.27μF, which is quite close to the average value of 49.2μF. This observed performance trend holds true across multiple frequencies, such as 50 Hz (47.38μF compared to the average of 45.91μF), 100 Hz (47.07μF compared to the average of 44.55μF), and even at 500 Hz (46.2μF against the average of 41.55μF). This indicates a consistent performance at varying test frequencies.

When tested at frequencies greater than or equal to 100 kHz at 1V, the capacitor demonstrates above-average performance. For example, at 100 kHz, the capacitor registers a capacitance of 48.61μF, whereas the benchmark average is 30.1μF. This trend of outperforming the benchmark is most notable at 150 kHz (65.81μF vs. 33.11μF) and 200 kHz (133.1μF vs. 68.56μF). This reveals the A755KS476M1EAAE025 capacitor's impressive high-frequency capabilities at a testing voltage of 1V.

When testing at a higher voltage of 10V, the capacitor starts with near-average values at lower frequencies (5 Hz: 48.58μF vs. 49.2μF; 10 Hz: 48.3μF vs. 48.14μF) and moderate frequencies (50 Hz: 47.5μF vs. 45.91μF; 100 Hz: 47.14μF vs. 44.55μF). However, the performance disparity between the capacitor and the benchmark becomes more evident at higher frequencies. In the 50 kHz - 200 kHz range at 10V, the capacitor's performance is noticeably higher than the benchmark average values. This further underlines the A755KS476M1EAAE025 capacitor's strong performance when operating in high-frequency scenarios at an increased voltage of 10V.

Series Resistance

In this section, we discuss the series resistance of KEMET's A755KS476M1EAAE025 capacitor in comparison to a statistical benchmark of other components with the same nominal value. The component data indicates that at 1 volt, the series resistance for A755KS476M1EAAE025 ranges from 8.597 Ohms at 5 Hz test frequency to 15.28m Ohms at 1 MHz.

Comparing this to the benchmark data, it is observed that the KEMET capacitor has considerably lower series resistance at higher test frequencies (50 kHz to 1 MHz), which indicates better performance for high-frequency applications. This is due to the specific materials and design used in this capacitor that reduce the parasitic effects and enhance electrical conductivity at such frequencies.

Within the low-frequency range (5 to 10 Hz), the component's series resistance is closer to the minimum values of the benchmark, which is 8.597 Ohms at 5 Hz and 4.286 Ohms at 10 Hz, still putting it in the better performing regions. It is important to note that even though the capacitor's resistance is higher in these low-frequency ranges, it still delivers a satisfactory performance by being within the lower range of the benchmark.

Moving to a 10-volts LCR measurement, the KEMET capacitor shows a series resistance of 9.293 Ohms at 5 Hz, near the lower range of the benchmark data, and 3.971 Ohms at 10 Hz, continuing to perform well. However, it is important to note that there are data gaps in the LCR measurements at higher-test frequencies for 10 volts, which might limit the comparisons for performance at elevated voltages.

In this section on series resistance, the KEMET A755KS476M1EAAE025 Aluminum Polymer Capacitor performs well in comparison to the statistical benchmark data, showcasing enhanced performance and lower series resistance, particularly in high-frequency scenarios. As the series resistance has a direct impact on the equivalent series resistance (ESR) and overall efficiency of the capacitor, these lowered resistance values enable better thermal performance and reduced power losses in capacitor applications. Engineers working with high-frequency applications should consider this capacitor as a suitable option, whereas for other applications, the A755KS476M1EAAE025 still performs well by staying within the lower range of the benchmark.

Dissipation Factor and Quality Factor

The A755KS476M1EAAE025 Capacitor exhibits a dissipation factor (Df) range of 0.013 to 2.604 and a quality factor (Q) range of 76.54 to 4.46 when assessed at a 1 Volt test condition across a variety of testing frequencies. In comparison to the statistical benchmark, the capacitor provides commendable performance when operating within a dissipation factor of up to 20 kHz. However, it is important to note that its performance begins to deteriorate as the frequency increases beyond 150 kHz.

When subjected to a 10 Volts test condition, the A755KS476M1EAAE025 Capacitor demonstrates a Df range of 0.002 to 0.945 and a Q range of 70.73 to 8.48. Notably, the capacitor's performance at 50 kHz is exceptional, as it significantly surpasses the statistical benchmark. However, the available data regarding this capacitor lacks information on frequencies between 100 Hz and 50 kHz, which could potentially affect its suitability for applications with specific frequency requirements.

In order to thoroughly evaluate the A755KS476M1EAAE025 Capacitor, it is crucial to consider both its advantageous features and areas where its performance may not be as robust, particularly when compared to the statistical benchmark within specific frequency ranges. Assessing its overall functionality depends on the specific application's requirements and the frequency range in which the capacitor is expected to operate optimally.

Comparative Analysis

Conclusion

In analyzing the KEMET A755KS476M1EAAE025 capacitor's performance against the statistical benchmarks given, it can be seen that this component delivers satisfactory results in most cases. There are some points worth highlighting in comparison to the benchmark values.

At a test frequency of 5 Hz and 1 V, this capacitor performs fairly close to the average impedance, dissipating tiny amounts of energy relative to the average dissipation factor. The performance at 10 Hz, 50 Hz, and 100 Hz also stays quite close to the average, suggesting its capability to work well at low frequencies.

When observing the series capacitance and other parameters in the given ranges, it is evident that the component performs reasonably well. The capacitor retains its face value of 47μ within a majority of the test frequencies, demonstrating good capacitance stability.

However, at higher frequencies such as 300 kHz and above, the capacitor's impedance values diverge from the average, affecting its performance at these points. Additionally, at 1 MHz, the capacitor exhibits a higher than average dissipation factor, implying increased energy losses at this frequency.

In conclusion, the KEMET A755KS476M1EAAE025 capacitor demonstrates a commendable performance within low to mid-range frequencies, while having minor deficiencies at higher frequencies. This capacitor will likely perform well within applications favoring lower frequency ranges, but engineers should be mindful of its performance at higher frequencies when considering its suitability in their circuits.