Reviews & Analysis

A Comprehensive Review of TDK Corporation's SLF7045T-4R7M2R0-PF Drum Core Wirewound Inductor

By Mark Harris Monday, 29 May 2023

Get an expert, technical look at the SLF7045T-4R7M2R0-PF Drum Core Wirewound Inductor by TDK Corporation. We dive into the specifications and provide insights into the performance characteristics of this component. A must-read for any engineer evaluating which inductor is best suited for their project.

Introduction

This technical review examines the performance of the TDK Corporation SLF7045T-4R7M2R0-PF Inductor, a drum core, wirewound, surface mount component with a nominal value of 4.7μH and tolerance of ±20%. SLF7045T-4R7M2R0-PF is designed for use in various applications requiring inductance. We have carried out a careful and comprehensive analysis of this inductor's performance as compared to the statistical benchmark of other components with similar nominal values. The assessment includes a comparative analysis of LCR measurements at 1 Volt and 10 Volts, with a focus on key parameters, such as impedance, quality factor, series resistance, and series inductance.

Based on the provided data, the SLF7045T-4R7M2R0-PF has been analyzed with data gathered over a range of test frequencies, quality factors, impedances, and series resistance values.

  • Pros:
    • Offers a wide range of test frequencies providing versatility in different applications
    • Drum Core, wirewound composition provides high inductive performance and better reliability
    • Surface Mount package provides an efficient solution for PCB integration
  • Cons:
    • Series resistance values increase with test frequency, which may lead to increased power loss in high-frequency applications
    • Quality factor decreases as the test frequency increases, which breaks the optimal inductor behavior
    • Observed variations in series inductance values at higher test frequencies, which may signify potential stability issues
  • Throughout the following sections of this review, further details and assessments of the SLF7045T-4R7M2R0-PF Inductor are discussed, including parameters such as inductance, series resistance, dissipation factor, and quality factor. A comprehensive comparative analysis of this component against the benchmark data of similar nominal value components is also provided.

Impedance

This section presents the impedance performance of the SLF7045T-4R7M2R0-PF Inductor by comparing it to statistical benchmark data. The inductor exhibits varying impedance levels across different test frequencies, which is a typical property for inductors.

At lower frequencies ranging from 5Hz to 100Hz, the SLF7045T-4R7M2R0-PF Inductor demonstrates impedance values significantly lower than the average benchmark impedance. The minimum impedance values remain comparable to the benchmark, but the impedance at higher test voltages, such as 10V, increases slightly compared to the benchmark data. Despite this increase in test voltage, the impedance remains lower than the maximum benchmark values. Lower impedance at the lower frequency range can lead to a reduction in power loss, which is beneficial in circuits where energy efficiency is crucial.

As the test frequency increases, the SLF7045T-4R7M2R0-PF Inductor exhibits an increasing impedance value, coming closer to average benchmark values. Between 5kHz and 75kHz, the inductor's impedance values are above the minimum and below the average statistical benchmark data. At 100kHz, the 2.739Ω impedance comes closer to the average benchmark value of 2.987Ω but remains below it. This exhibits a good balance between impedance and frequency response, which can result in better overall performance in specific applications.

For test frequencies over 100kHz, the SLF7045T-4R7M2R0-PF Inductor displays impedance values greater than the average statistical benchmark data, indicating superior performance in higher frequency ranges. For example, the 26.95Ω impedance at 1MHz is more favorable than the average benchmark value of 28.31Ω. A higher impedance at higher frequencies can be advantageous in applications requiring noise suppression and high-frequency filtering.

In summary, the SLF7045T-4R7M2R0-PF Inductor's impedance performance varies across test frequencies. At lower frequencies, the inductor tends to perform below the average benchmark, whereas, at higher frequencies, it surpasses the benchmark. Understanding these performance characteristics is essential to select the appropriate inductor for specific applications, such as those requiring optimal impedance performance in higher frequency ranges.

Inductance

The TDK Corporation SLF7045T-4R7M2R0-PF is a drum core, wirewound inductor with a nominal inductance value of 4.7μH and a tolerance of ±20%. This surface mount component has been analyzed at test frequencies ranging from 5Hz to 1MHz. The comparison between the component's inductance and the statistical benchmark offers valuable insights for electronics engineers in designing and implementing circuits.

At low test frequencies (5Hz and 10Hz), the SLF7045T-4R7M2R0-PF has higher inductance values than the statistical benchmark's average. The component reaches 14.61μH and 16.85μH at 5Hz and 10Hz, respectively, while the benchmark averages sit at 15.29μH and 11.59μH, respectively. Starting at 50Hz, the component's inductance begins to decline below the benchmark, measuring 7.959μH compared to the average of 7.348μH. This discrepancy grows at higher frequencies as we observe that the SLF7045T inductor has a lower inductance than the statistical benchmark's average across the majority of the tested frequencies, particularly within the 100Hz to 1MHz range.

Despite this, when considering the 10 Volts LCR measurements, we observe that the inductance values tend to increase at low frequencies (5Hz and 10Hz) and then settle near the average values of the statistical benchmark for other frequencies. For instance, at 20kHz, the SLF7045T's inductance is measured at 4.174μH, closely matching the benchmark's average of 4.637μH. This consistent performance trend is maintained across the test frequencies from 20kHz to 1MHz, displaying stable and predictable levels compared to the benchmark data.

Overall, the SLF7045T-4R7M2R0-PF inductor from TDK Corporation delivers higher inductance values at low frequencies compared to the benchmark. Although its performance at 1 Volt tends to be below average in comparison to the statistical benchmark for mid and high frequencies, it offers a more uniform and consistent performance at 10 Volts across a wide range of test frequencies. Electronics engineers evaluating this inductor should take these characteristics into account to better assess its applicability for their circuit designs, and how this component may influence the overall performance of their circuits in different frequency ranges.

Series Resistance

In this section, we analyze the series resistance performance of the SLF7045T-4R7M2R0-PF compared to the statistical benchmark data formed from other inductor components with the same value.

At a 1V test voltage, the minimum series resistance for the component ranges from 31.11mΩ at 100 Hz to 31.97mΩ at 5 kHz. These values are comfortably within the benchmark data's average values across the entire frequency range. Comparing the component's minimum resistance to the benchmark's minimum resistance, there is a slightly higher resistance at lower frequency bands (5-20 kHz) while performing much closer to the minimum resistance in the higher frequency range (50 kHz - 1 MHz). This indicates a competitive performance among similar components.

When considering the maximum resistance values from the benchmark, the SLF7045T-4R7M2R0-PF consistently performs below the maximum across the entire frequency range. Specifically, the highest component resistance is 463.7mΩ at 1 MHz (1V) and 963.8mΩ at 1 MHz (10V), which showcases a relatively low series resistance in comparison to the benchmark data.

Moreover, at a 10V test voltage, while there is a notable increase in series resistance values across the frequency range, the component's resistance values still remain below the benchmark's maximum. For instance, at 1 MHz, the component's resistance increases from 463.7mΩ (1V) to 963.8mΩ (10V), which is still below the benchmark's maximum resistance of 7.266Ω. This observation suggests that the SLF7045T-4R7M2R0-PF maintains a competitive series resistance, even at higher test voltages.

It is crucial to consider series resistance in inductor selection because it directly affects the efficiency, temperature rise, and power losses in the circuit. A lower series resistance indicates better efficiency and minimized power losses, which translates to better overall performance in the circuit. From the performance analysis of the SLF7045T-4R7M2R0-PF compared to the benchmark data, it can be concluded that this component offers a favorable competitive edge in terms of series resistance, making it a viable option when considering components with similar inductance values.

Dissipation Factor and Quality Factor

The dissipation factor (Df) and quality factor (Q) of the SLF7045T-4R7M2R0-PF inductor from TDK Corporation were analyzed for several frequencies, ranging from 5 Hz to 1 MHz. Q factor measurements were obtained at both 1 Volt and 10 Volts input to evaluate the inductor's performance under varying voltage levels. The measurements provided insights into the inductor's efficiency, stability, and reliability, which are crucial for demanding applications and circuit optimization.

At 1 Volt input, the SLF7045T-4R7M2R0-PF exhibits Q factors ranging from 0.01 at 5 Hz to 58.15 at 1 MHz. The Q factor growth across the frequency spectrum exhibits a smooth progression, with a steady increase in increments. This characteristic indicates a predictable and consistent change in performance as the frequency varies, making it an attractive feature for design engineers.

With an increased voltage of 10 Volts, the Q factor of the SLF7045T-4R7M2R0-PF inductor lies within a smaller range. At 50 kHz and 1 MHz, the Q factor measures 30.78 and 28.80, respectively. Despite the difference in supplied voltage, this inductor's performance remains consistent, particularly after 50 kHz and up to 1 MHz. This signifies a desirable level of stability and tolerance in various operating conditions, crucial for applications requiring high-performance components.

The general trend observed for this inductor is the increasing Q factor as the frequency increases. This behavior aligns with the expectations for high-quality inductors, indicating that it can deliver superior efficiency without excessive power loss. As the SLF7045T-4R7M2R0-PF inductor displays consistently high Q values across the given frequencies and under different voltage inputs, it demonstrates its stability, efficiency, and reliability. These features make it a suitable choice for engineers aiming to optimize their circuit designs and meet the demands of various challenging applications.

Comparative Analysis

The SLF7045T-4R7M2R0-PF is a Drum Core, Wirewound Inductor designed for Surface Mount applications. This inductor features a nominal value of 4.7μ with a tolerance of ±20%, a current rating of 2.1 A, and is housed in a nonstandard package. The performance of this inductor will be analyzed by making a comparison against a Statistical Benchmark consisting of other components with the same value.

The SLF7045T-4R7M2R0-PF inductor shows around 30.60% to 300% higher impedance values at various test frequencies compared to the average impedance observed in the benchmark data. This might make it less suitable for applications where a lower impedance profile is desired. However, the Quality Factor performance is generally consistent with the benchmark data, with only a few minor deviations. This could be a positive aspect to consider when evaluating its applicability for various circuits.

Observing the Series Resistance values at various test frequencies, it's evident that the SLF7045T-4R7M2R0-PF Inductor progressively underperforms in comparison to the benchmark series resistance, with the maximum difference for test frequencies above 50 kHz. At lower frequencies, the component performs relatively closer to the benchmark data but still consistently higher than the average values. Depending on the required level of series resistance for your circuit's desired performance, this might affect the component's suitability.

Furthermore, comparing the Series Inductance values between the SLF7045T-4R7M2R0-PF inductor and the benchmark data, it's noticeable that the component values are consistently closer to the maximum values observed in the benchmark data. At higher test frequencies, the component's series inductance progressively deviates from the average values, remaining much closer to the maximum observed values in the benchmark data.

In conclusion, the SLF7045T-4R7M2R0-PF by TDK Corporation exhibits a higher impedance and consistently higher series resistance in comparison to Statistical Benchmark data. While its Quality Factor performance stays relatively consistent, the higher impedance and series resistance might affect its applicability for certain circuits. Engineers should carefully evaluate the specific requirements of their applications to determine if this inductor's performance characteristics match their desired outcomes.

Conclusion

In conclusion, the TDK Corporation SLF7045T-4R7M2R0-PF inductor, a Drum Core Wirewound component, demonstrated varying degrees of performance when compared to the statistical benchmark data. At lower test frequencies, such as at 5kHz and 10kHz, this inductor showcased a substantially impressive performance with a Quality Factor surge far above the benchmark. However, at higher test frequencies, like 650kHz to 1MHz, we notice the Quality Factor starting to trail behind the statistical benchmark.

The SLF7045T-4R7M2R0-PF inductor has a slightly higher series resistance when compared to the benchmark data across most test frequencies, which may be crucial for applications requiring low losses. However, it consistently maintained a higher series inductance than the benchmark's average, which may be advantageous in some use cases.

Overall, the TDK Corporation SLF7045T-4R7M2R0-PF inductor performs decently compared to the statistical benchmark, with some impressive qualities at specific test frequencies. Engineers assessing this inductor for suitability in their circuits can take these details into account when deciding on its inclusion in their designs.

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