Introduction

In this technical review, we aim to thoroughly evaluate and analyze the performance of KEMET's T495D476M025ATE120 Tantalum molded capacitor. This surface-mount component features a nominal capacitance value of 47μF with a tolerance of ±20%, and a voltage rating of 25V. To determine its suitability for use in your project, we will assess its effectiveness by comparing it against available statistical benchmark data, considering factors such as capacitance, series resistance, dissipation factor, and quality factor to provide a comprehensive assessment of the capacitor's performance.

Pros:

• Nominal capacitance value is consistent with the benchmark.
• Offers a wide range of test frequencies, from 5Hz up to 1Mhz.
• Generally good dissipation and quality factors across various test frequencies and voltage levels.

• Impedance values at 1 Volt and 10 Volts show significant variability in comparison to the benchmark data, potentially impacting its reliability in specific applications.
• Higher test frequencies reveal diminishing performance in terms of capacitance and series resistance, which may not be suitable for high-frequency applications.
• Some test frequencies at 10 Volts exhibit inconsistent measurements or no data, reducing confidence in the overall performance evaluation.

Impedance

When evaluating impedance, it's crucial to perform a comprehensive impedance analysis. In this review, we have considered both 1V and 10V LCR measurements to ensure a thorough understanding of the capacitor's performance across various frequencies.

At 1V LCR measurements, the capacitor demonstrates relatively average impedance values for frequencies at 100Hz, 500Hz, 1kHz, and 10kHz. However, for frequencies such as 5 Hz, 50 Hz, 20 kHz, 50 kHz, and 100 kHz, the capacitor displays noticeably higher impedance values compared to the benchmark averages. Further, at analyzed frequencies between 70 kHz and 1 MHz, the capacitor exhibits marginally higher impedance than the benchmark average values, although not to a significant degree. This performance at 1V provides adequate impedance compatibility for the capacitor, suggesting its potential effectiveness in mitigating high-frequency noise in electronic circuits.

Regarding 10V LCR measurements, the capacitor's impedance values demonstrate a similar pattern as that observed with the 1V measurements. There is a substantial deviation from benchmark average values at frequencies below 50Hz, while impedance values for 50Hz, 100Hz, 500Hz, and 1kHz frequencies are relatively close to the respective averages. Although the difference is less pronounced than in 1V measurements, the capacitor's impedance continues to exhibit a slightly higher trend between 20kHz to 700kHz, which implies the capacitor can maintain its noise-suppressing capabilities in the high-frequency range. However, it's worth noting that the capacitor's data for frequencies above 750kHz is unavailable.

In summary, considering both 1V and 10V LCR measurements, the capacitor complies with average benchmark impedance values, with a slightly superior performance in high-frequency noise suppression. These characteristics make this Tantalum Molded Capacitor a viable candidate for use in various circuit designs where satisfactory impedance performance across a wide frequency range is essential.

Capacitance

In examining the capacitance performance of KEMET's Tantalum Molded Capacitor, specifically part number T495D476M025ATE120, it is important to reference the provided statistical benchmark under various test conditions. This particular capacitor has a nominal capacitance value of 47μF, with a tolerance of ±20%, making it versatile and reliable for numerous applications.

During testing at lower frequencies, such as 5Hz and 10Hz, the T495D476M025ATE120 exhibits capacitance values that are comfortably within the average range defined by the statistical benchmark. These measured values, 48.1μF at 5Hz and 47.72μF at 10Hz, illustrate the capacitor's competency at this frequency range. Moreover, as test frequencies increase up to 100kHz, the capacitance remains relatively stable and adheres closely to its nominal value, further corroborating its overall effectiveness.

Nevertheless, it is critical to recognize the discrepancies that arise when test frequencies exceed 100kHz. Capacitance values of the T495D476M025ATE120 begin to diverge from the statistical benchmark within the frequency range of 150kHz to 750kHz. In this range, capacitance values decrease notably, culminating in 131.1μF at 750kHz. Although this deviation might raise concerns among engineers, it is essential to understand that such behavior is not atypical for capacitors operating at high frequencies.

Alternatively, LCR measurements taken at 10 Volts present a different perspective, showcasing an initial capacitance peak of 192.3μF at 5Hz before steadily decreasing towards the nominal value. The capacitor's stability remains consistent below 50kHz; however, capacitance values incrementally increase for frequencies beyond 50kHz, ultimately reaching an impressive 730.3μF at 600kHz.

In summary, the KEMET Tantalum Molded Capacitor T495D476M025ATE120 demonstrates stable and close-to-nominal capacitance values within standard frequency ranges. Nonetheless, it is crucial to account for significant deviations from the statistical benchmark when operating at frequencies beyond 100kHz. To ensure proper function and compatibility, engineers must thoroughly assess this capacitor's performance data against the specific demands of their application.

Series Resistance

At a 1V test voltage, the T495D476M025ATE120 demonstrates commendable series resistance performance across all frequency ranges in contrast to the statistical benchmark's average. To illustrate, a measured series resistance of 129.1mΩ is observed at 5 kHz, which is significantly lower than the benchmark average of 345.7mΩ. In a similar fashion, at 100 kHz, the capacitor exhibits a series resistance of 85.96mΩ, which surpasses the benchmark average of 298.3mΩ. This favorable trend extends across all other tested frequencies, indicating that the T495D476M025ATE120 exhibits exceptional performance in the aspect of series resistance.

Comparative results are observed when subjecting the capacitor to a 10V test voltage. The T495D476M025ATE120 outshines the benchmark across all frequency ranges. For instance, at 50 kHz, the capacitor records a series resistance of 94.12mΩ, which is a considerable improvement when juxtaposed with the corresponding benchmark value. Furthermore, at 200 kHz, the series resistance measures 58.92mΩ, also comparing advantageously to the benchmark.

Through close examination, the T495D476M025ATE120 showcases superior series resistance performance when juxtaposed with the statistical benchmark. Engineers who are considering this capacitor for their circuit designs stand to benefit from its remarkable series resistance characteristics, which remain consistent across diverse test frequencies and voltage ratings. Based on these performance metrics, the T495D476M025ATE120 presents itself as a valuable contender for applications that prioritize low series resistance and heightened efficiency. This not only contributes to a reduced energy loss across the capacitor but also leads to consistent performance across various operating conditions, making it a highly reliable component in electronic circuits.

Dissipation Factor and Quality Factor

In this section, we delve into the performance characteristics of the T495D476M025ATE120 Tantalum Molded Capacitor, with an emphasis on its Dissipation Factor (Df) and Quality Factor (Q). By examining the LCR measurements taken at 1 Volt, one can observe that the Dissipation Factor (Df) demonstrates a range of values, from a low of 0.018 at 5 Hz to higher values at 850 kHz. Significantly, the Df settles at a mere 0.017 at both 10 and 50 Hz, showcasing the capacitor's performance under these conditions. In parallel, the Quality Factor (Q) fluctuates from 55.80 at 5 Hz to lower values at 850 kHz, indicating a considerable decline as the test frequency experiences an increment. It's worth noting that the Q factor reaches its peak value of approximately 59.03 at the 10 Hz frequency.

Upon scrutinizing the LCR measurements carried out at 10 Volts, we discern an alarming increase in the Dissipation Factor values when operating at lower frequencies. To be specific, the Df values escalate to 1.508 and 0.795 at 5 Hz and 10 Hz, respectively. Contrarily, the Quality Factor displays a wide range of results. While it achieves a peak value of 40.25 at 100 Hz, a stark contrast appears when it nosedives at 600 kHz.

In essence, the T495D476M025ATE120 Tantalum Molded Capacitor exhibits a low Dissipation Factor and a relatively high Quality Factor when subjected to lower test frequencies (particularly under 1-Volt conditions). It is essential for engineers to exercise caution when considering the use of this capacitor in high-frequency circuits or at augmented voltages. The reason being, the Dissipation Factor undergoes a substantial increase under such circumstances, consequently affecting the overall performance of the component in these specific scenarios.

Comparative Analysis

Conclusion

In analyzing the performance of the KEMET T495D476M025ATE120 Tantalum Molded Capacitor, we compared its electrical characteristics against the provided statistical benchmark data for capacitors of similar value. This detailed analysis enables fellow electronics engineers to better assess the suitability of this capacitor for their respective circuits.

Overall, the T495D476M025ATE120 Capacitor demonstrates a performance that is mostly within the expected range when compared to the statistical benchmark data at 1 Volt test frequency. For example, at a test frequency of 50 Hz, the measured impedance of 67.79 Ohms and a dissipation factor of 0.017 indicates satisfactory performance. However, some discrepancies in performance can be found at higher test frequencies, such as 250 kHz, where the component capacitor's impedance appears to be 73.85 mOhm (versus a benchmark average of 293.6 mOhm) and a measured dissipation factor of 2.032 (compared to the benchmark average of 2.63).

Moreover, as the test voltage increases to 10 Volts, we can observe a decline in the capacitor's performance relative to the statistical benchmark. For instance, at a lower test frequency of 5 Hz, it shows a much higher impedance of 304.7 Ohms and a dissipation factor of 1.508, indicating that the capacitor may exhibit increased losses. Nonetheless, its performance appears to be relatively consistent at mid-range test frequencies, such as 100 Hz, wherein the measured impedance and dissipation factor closely follow the expectations set by the statistical benchmark data.

In conclusion, the KEMET T495D476M025ATE120 Tantalum Molded Capacitor offers a generally acceptable performance that falls within the expected range when compared to capacitors of similar value at various test frequencies. However, engineers should exercise caution when using this capacitor in high-voltage applications, as it may exhibit increased losses at higher voltages. We recommend considering the specific application requirements and environmental conditions when evaluating the suitability of the capacitor for its intended purpose.