Comparison of Taiyo Yuden’s NRS 4018 Series and Vishay’s IFSC 1515 Series
Finding a replacement inductor for an already completed design can be a risky and time consuming process. This is risky because the product datasheet does not always reflect the actual performance of the part and is time consuming as the actual validation of the replacement inductor often involves in-house lab testing. Some manufacturers have tried to reduce the risk and time involved in this process by providing cross reference tools and PDF files on their website. However, their tools often have the same limitations – their cross references are not supported by laboratory tests and comparisons at all operational points, so it is always up to the customer to validate the recommended parts themselves. SourcingBot recently released its cross-reference tool, which finds replacements from all manufacturers and provides lab measurements engineers can use to verify replacement parts. In this article, we will look at two popular series of SMD inductors from Taiyo Yuden and Vishay, demonstrate the traditional cross-referencing method, present a technique to make the method more robust, and finally see the SourcingBot tool, which can be trusted. and references. lightning speed valid inductance crossings.
Compare data sheet values for fixed inductors
The traditional method of crossing is done by comparing the parameters of the datasheet of the two parties. As a rule, this must be done manually, as many parameters such as rated current or saturation current are guaranteed under certain operating conditions and are only listed in the datasheet. SourcingBot displays datasheet parameters and measurement conditions on the parts page and comparison chart, eliminating the need for engineers to go through each datasheet to determine if the current rating was measured with a 20 degree change or 40 degrees, for example.
Here we will be looking at the Taiyo Yuden NRS4018T100MDGJV (NRS 4018 series) and the Vishay IFSC1515AHER100M01 (IFSC 1515 series). To validate a direct exchange, the electrical and mechanical properties of the two parts must be similar. The dimensions of the two pieces are the same at 4 x 4mm and their height parameters differ from 0.1mm to 1.8mm (Taiyo Yuden) and 1.9mm (Vishay). Both parts are shielded and have DC resistance values of 150mOhm (Taiyo Yuden) and 170mOhm (Vishay). They have a nominal inductance of 10uH at 100 kHz and a saturation current of 1.2A (Taiyo Yuden) and 1.3A (Vishay), given an inductance drop of 30%. Taiyo Yuden part is classified according to AEC-Q200, which is important for automotive applications. Both parts have a tolerance of 20% from the nominal inductance.
Comparing the datasheet parameters of the two parts, it looks like they would be a good substitute for each other except for automotive applications. Here, a typical referral ends with the conclusion that the two parts could be compatible with each other. However, this analysis does not confirm with 100% certainty that these two parts work in place of the other.
Fixed inductance operating point analysis
Comparing values from datasheets is a good place to start for cross-referencing, but it doesn’t answer an important question: how do these parts perform with operating current and how often they are used? In the past, this type of analysis was time consuming or simply ignored, as the operating point behavior of parts had to be measured manually or (if you’re lucky) find it on the manufacturer’s website. Since these maps are available for each part, the two charts must be compared visually, which is a challenge given the different scales and measurement conditions used by different manufacturers.
Operation point analysis can now be performed easily and free of charge with SourcingBot’s chart comparison tools. Their engineers collected and compared lab measurement data for fixed inductors and other passive components so that they could easily be compared between data sheet values and operating points. If we search for our two inductors in their database, we can easily check the impedance and inductance versus frequency, as well as the saturation and temperature rise curves. Here we can check if our two inductors are producing the same performance at the intended operating point.
Here we can see that the nominal inductance shown in the datasheet is not always exactly what you get. The Taiyo Yuden inductor measures less than 10uH (still within tolerance) while the Vishay part starts with an inductance above the nominal value. However, depending on the operating condition, Taiyo Yuden inductor may be preferable due to its relative stability compared to the Vishay part.
The temperature curves show that both parts exceed their current rating specification and should perform similarly in the thermal direction.
If we look at the impedance as a function of frequency, we can see that the Taiyo Yuden part remains inductive at operating frequencies which are about 10 MHz higher than the Vishay part. This is probably due to the lower inductance value we saw in the L vs I map.
Automating the Driver Cross Reference Process with SourcingBot
In this article, we have seen that not all cross references are the same. At some operating points, the two inductors do not work the same, meaning more detailed analysis is needed to ensure compatibility. This entire process has been automated by SourcingBot engineers to accelerate your product development and strengthen your supply chain. Your website will automatically perform the first step of cross-reference, compare datasheets, and display a list of the most similar parts.
Depending on your cross-reference requirements, different parts can be found at the push of a button, for example those with higher rated current. In the comparison table, it is easy to compare the performance at your operating point with the “Click to compare” button. In addition, the parameters measured in the laboratory are compared to the parameters of the datasheet in an easy-to-read table for each part.
To view the SourcingBot tools for cross references and comparisons, visit the website at SourcingBot.com and search for parts.
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