I find that LVK25R001DER is NOT available other than a small quantity at Digikey and has a 39 week lead-time listed. I prefer to use this part, but am concerned about sourcing availability and lead-time. The alternate part that I’m planning to move forward w/ is FC4L64R001JER which has an odd landing pattern which will make replacing the part difficult if it were to go obsolete (Likely require a PCB redesign). The JER part has a 22 week lead-time which is much better. Any suggestions?
Hello @dawn.stokes,
Thank you for your post.
We currently have 67 pieces of LVK25R001DER in stock.
https://www.digikey.com/en/products/detail/ohmite/LVK25R001DER/5125251
We also have 873 pieces of the FC4L64R001JER in stock.
FC4L64R001JER Ohmite | Chip Resistor - Surface Mount | DigiKey
Thank you for your response. This is a new product line for us, so we need to determine which part is our best long term option.
Our preferred part is LVK25R001DER; however, we are concerned about its lead time. Has this part consistently had a long lead time, and do you anticipate it becoming obsolete?
Part # FC4L64R001JER offers a shorter lead time; however, if it were to become obsolete, replacement would be very challenging. Do you anticipate this part becoming obsolete?
Neither option mentioned seems appealing from a procurement standpoint. I’d also point out that the -JER device is of 5% tolerance while the -DER is 0.5%, which seems like a rather substantive difference from a design standpoint.
A technique I suggest for informing such decisions is to filter on the basis of non-negotiable attributes (such as resistance value and power rating) and use the “download table” button to get results in spreadsheet format. Set up a pivot table in that to show (for example) count of Mfr. P/Ns by Package/Case in order to see which options are most likely to give options for multi-source availability.
Obsolescence (and availability) is not an easily predicted phenomenon. It’s driven primarily by the financial viability of any given product line, but also affected by natural disasters, unnatural disasters, and other such things.
One’s best insurance in such cases is to avoid exotic component selections and design with the most generic/multi-sourceable components possible. If what you need is a 1mΩ resistor good for 2+ watts, you’ll have a lot more options looking at a standard 2-terminal 2512 package compared to a 4-terminal side-mount package. As described here and elsewhere, being thoughtful about the pad design can do a lot to compensate for lack of explicit kelvin connections.