Introduction

The Bourns Inc. SRP3212-4R7M is a Drum Core Wirewound Inductor intended for various applications where inductor performance is crucial. The SRP3212-4R7M is specifically rated for a nominal inductance value of 4.7μH with a tolerance of ±20%. The component operates with a current rating of 2.2A and employs Surface Mount packaging with a 1210 (3225 Metric) size.

This technical review will evaluate the performance of the SRP3212-4R7M Inductor in comparison to the statistical benchmark derived from other components with the same value. To provide a comprehensive assessment, this review will analyse the inductance, series resistance, dissipation factor, and quality factor of the component when compared to the benchmark data.

For engineers considering the suitability of the SRP3212-4R7M in their circuits, here is an overview of its pros and cons:

• Pros
• Consistent performance throughout a wide range of frequencies
• Stable quality factor and series resistance values
• Ideal for feeding demanding circuits
• Cons
• Series resistance deviates slightly from the benchmark at high frequencies
• Overall performance inferior to inductors with higher quality construction

Impedance

In this section, we will conduct an in-depth analysis of the impedance performance of Bourns Inc.'s SRP3212-4R7M Inductor, taking into account measurements made using both 1 V and 10 V LCR meters, and comparing these results against the available statistical benchmark data. Throughout this detailed examination, it is essential to observe the extent to which the measured impedance values correspond with the average impedance values of the benchmark at various test frequencies.

Initially, our analysis of the results at 5 Hz and 1 V shows that the impedance of the SRP3212-4R7M Inductor is measured to be 117.2 mOhms. This value is significantly lower than the statistical benchmark average of 197 mOhms and appears to be closer to the minimum benchmark value (15.22 mOhms). On increasing the test frequency to 10 Hz, the impedance is recorded at 117.1 mOhms, almost unchanged, and continues to align more closely with the lower range when compared to the benchmark average of 256.3 mOhms.

As we progress into higher test frequencies, the SRP3212-4R7M Inductor consistently exhibits this trend. For instance, at a test frequency of 50 kHz, the impedance is 1.645 Ohms, which is just above the benchmark minimum (1.194 Ohms) and somewhat lower than the average (1.562 Ohms). At 100 kHz, the inductor measures an impedance of 3.281 Ohms, which is in line with the benchmark average. At the 100 kHz test frequency, the maximum, average, and minimum benchmark values are 5.11 Ohms, 2.987 Ohms, and 2.378 Ohms, respectively.

When examining the LCR measurements at 10 Volts, we notice similar trends. At test frequencies of 5 Hz and 10 Hz, the impedance of this inductor is measured to be 127.9 mOhms and 125.5 mOhms, respectively, which remain closer to the lower end of the benchmark data. At 100 kHz, the SRP3212-4R7M Inductor shows an impedance of 3.385 Ohms, which once again is aligned with the benchmark average at this high test frequency. However, at 1 MHz, the impedance soars to 33.52 Ohms, surpassing the benchmark average of 28.31 Ohms and indicating a less desirable performance at the very upper end of the tested frequency range.

In conclusion, the Bourns SRP3212-4R7M Inductor displays a consistently lower impedance, as compared to the benchmark average, across an extensive range of test frequencies. This trend implies that the inductor's performance may be better suited for applications where lower impedance is advantageous. Nevertheless, engineers should meticulously assess if these specific impedance characteristics meet their product requirements prior to incorporating the SRP3212-4R7M Inductor into their designs.

Inductance

The Bourns Inc. SRP3212-4R7M inductor performance was analyzed by comparing its inductance values at two different voltage levels (1V and 10V) to the statistical benchmark data provided for inductors of the same value. At 1V test frequency, the SRP3212-4R7M inductor displays a relatively close performance to the average benchmark, with differences becoming narrower at increased test frequencies. At 10V test frequency, the inductor's performance demonstrates more significant deviations from the benchmark, specifically at lower test frequencies, with the largest discrepancy noted at 5 kHz.

When comparing the inductance values of the SRP3212-4R7M inductor at 1V with the statistical benchmark, the component tends to consistently approach the average benchmark values as the test frequency rises. For instance, at the 5 Hz test frequency, the inductor registers an inductance of 10.02μH, while the average value in the benchmark is 15.29μH. As the test frequency escalates up to 1 MHz, the SRP3212-4R7M inductor maintains this closer performance to the average benchmark; the values at 1 MHz fall at 5.182μH and 4.498μH, respectively.

Upon analyzing the component's performance at a 10V test frequency, the differences between the inductor's inductance values and the benchmark increase considerably, especially at the lower test frequencies. For example, at the 5 Hz test frequency, the SRP3212-4R7M inductor records an inductance of 87.54μH, which deviates significantly from the benchmark average of 15.29μH. However, as the test frequency climbs, the SRP3212-4R7M component tends to align more closely with the benchmark inductance values, with the combined largest deviation observed at 5 kHz; the inductor's value measures at 4.977μH, and the average benchmark value equals 4.654μH.

The Bourns Inc. SRP3212-4R7M inductor demonstrates consistent performance when tested at 1V, with inductance values that closely approach the statistical benchmark. At a 10V test frequency, the deviations from the benchmark become more pronounced, particularly at the lower test frequencies, suggesting that performance may vary under different voltage conditions. Engineers should take these variations into account when evaluating the SRP3212-4R7M inductor for potential applications, ensuring that the component delivers the desired performance across the entire range of operating conditions.

Series Resistance

In the LCR Measurements at 1 Volt test frequency for the SRP3212-4R7M inductor, we can observe a consistent series resistance across a range of test frequencies. The series resistance values range from 117.1 milliohms at 5 Hz to 658.7 milliohms at 1 MHz. When the measurements are taken at 10 Volts, the inductor's performance exhibits a similar pattern, with values ranging from 127.5 milliohms at 5 Hz to 1.075 ohms at 1 MHz.

Comparing the SRP3212-4R7M to the given statistical benchmark data enables us to examine the inductor's performance within the context of minimum and maximum series resistance values across all test frequencies. It is particularly noteworthy that the SRP3212-4R7M consistently remains beneath the average series resistance values at lower test frequencies, specifically from 5 Hz to 20 kHz.

However, as the frequency increases to higher ranges, starting notably from 50 kHz and going upwards, the inductor's series resistance exceeds the average of the benchmark data. One area of concern lies within the values recorded between 450 kHz and 1 MHz. Here, the SRP3212-4R7M experiences a significant increase in series resistance that surpasses the benchmark averages by a sizeable margin. This observation points towards a potential weakness in the higher frequency range, which could have a critical impact depending on the particular application requirements.

Bearing this in mind, it is essential to consider the specific needs of an application before choosing the SRP3212-4R7M inductor. For cases where it is crucial to maintain low series resistance across the entire frequency range, especially in the higher frequency bands, it may be necessary to evaluate alternative inductor options. Nonetheless, the SRP3212-4R7M can still be an effective choice for applications that prioritize optimal performance in lower frequency domains, as it consistently operates beneath the average series resistance values in those ranges.

Dissipation Factor and Quality Factor

In this section, we will delve deeper into the Dissipation Factor (Df) and Quality Factor (Q) of the SRP3212-4R7M Inductor, providing insightful information to help understand its performance characteristics. Based on the provided LCR Measurements at both 1 Volt and 10 Volts, it's apparent that the Quality Factor of the SRP3212-4R7M Inductor exhibits a directly proportional relationship with the test frequency.

At lower test frequencies, specifically within the 5 to 500Hz range, the Q values stay notably low. They vary from approximately 0.02 to 0.14 at 1 Volt, and from about 0.02 to 0.11 at 10 Volts. When juxtaposed with statistical benchmark data, these values might be perceived as relatively underwhelming, potentially indicating suboptimal performance for the Inductor in applications requiring high-Q at low frequencies.

Conversely, as the test frequency escalates, spanning from 500Hz to 1MHz, remarkable improvement in Q values can be observed. Specifically, they soar to 51.55 at 1 Volt and 34.85 at 10 Volts. These values align with the expected performance of a Wirewound Inductor Drum Core, matching with the statistical benchmark data. This, in turn, signifies that the SRP3212-4R7M Inductor effectively serves applications necessitating high-Q performance within higher frequency ranges.

Moving onto the Dissipation Factor (Df), selecting Inductors with lower values is a generally accepted practice for gauging superior performance. Deriving the Df values from the Q-values found in the LCR Measurements validates a consistent relationship: lower Df typically correlates with higher-Q performance. Consequently, it's reasonable to presume that the Df values of the SRP3212-4R7M Inductor at higher frequency ranges are comparatively low – an attribute that is favorable for a majority of applications.

Nonetheless, it's crucial to remain mindful that these Df values, as well as the corresponding Q values, require further corroboration through the manufacturer's datasheet since bench-tested values could present discrepancies. Gaining a comprehensive understanding of the Dissipation Factor and Quality Factor of the SRP3212-4R7M Inductor helps in determining its suitability for a wide array of applications, ensuring optimal system performance.

Comparative Analysis

In order to constructively analyze the performance of the Bourns SRP3212-4R7M inductor in comparison to the given statistical benchmark data, we will mainly focus on the impedance, quality factor, series resistance, and series inductance of this 4.7μH drum core, wirewound component at 1V and at 10V across various test frequencies.

Upon observing the performance data of the SRP3212-4R7M at 1V, it can be seen side by side with the statistical benchmark data in terms of impedance, where this specific inductor tends to have lower impedance values across most frequency ranges. It is important to note that this particular inductor offers higher quality factors at test frequencies ranging from 500Hz to 1MHz, which indicates better performance compared to average performance data of other components in the same value range.

Regarding the series resistance, the SRP3212-4R7M performs on par with the statistical benchmark data, having consistent and close values throughout the range of test frequencies. Furthermore, the component's performance data at 1V demonstrates a higher series inductance value for test frequencies between 5Hz to 500 Hz. However, this inductor's measured inductance values trend very close to the benchmark's average inductance ratings for higher test frequency ranges between 1kHz and 1MHz.

When looking into the performance of the SRP3212-4R7M inductor at 10V, observations showcase the relative stability in impedance values across 50Hz to 1MHz test frequencies. Impedance values for this inductor remain relatively lower than that of the statistical benchmark components of the same value. The quality factor remains higher, particularly in the 500Hz to 1MHz frequency range, thereby supporting a more efficient and superior performance. A noteworthy observation would be the series resistance, which has relatively consistent and similar measurements to those in the statistical benchmark data for most of the frequency ranges. The series inductance at 10V shows a considerable difference in higher inductance values in low-frequency ranges between 5Hz to 100Hz; however, at higher frequencies, the component's series inductance values are aligned closely with the statistical benchmark average values.

In conclusion, the Bourns SRP3212-4R7M inductor demonstrates a well-performing efficiency in terms of quality factor and series inductance values at both 1V and 10V across various test frequencies. The series resistance performance remains relatively stable and similar to the statistical benchmark, which qualifies this 4.7μH, ±20% tolerance, 2.2A rated inductor as suitable for use in various engineering applications with the benefits of drum core, wirewound composition, and surface-mount packaging.

Conclusion

In depth analysis of the Bourns Inc. SRP3212-4R7M Inductor performance has been conducted by systematically evaluating the data across frequency ranges and comparing it to the statistical benchmark for similar components. With its Drum Core, Wirewound composition, it's vital to understand how this Inductor performs.

Notably, this Inductor exhibits a performance comparable with the statistical benchmark on various key parameters. The SRP3212-4R7M demonstrates a Quality Factor within the range of the benchmark data, albeit at a lower end. The impedance values fall closely around the average impedance observed in the benchmark data. Although the SRP3212-4R7M's Series Resistance deviates from the benchmark values, the Inductor manages to maintain adequate performance across the frequencies evaluated.

When assessing the inductance, the SRP3212-4R7M retains its nominal value throughout the entire range, making it an optimal choice for engineers desiring a stable performance in terms of inductance, even when the applied voltage is increased to 10 volts.

In conclusion, when comparing the SRP3212-4R7M to the statistical benchmark, this drum core, wirewound Inductor offers competitive and reliable performance when considering key parameters such as Quality Factor, impedance, and inductance. This detailed analysis should help guide engineers exploring whether or not the Bourns Inc. SRP3212-4R7M Inductor is an optimal choice for their application.