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I’m trying to solve an odd problem in a creative way. I have production boards that have 718-594D337X9016R2TTR-ND on them. We have some occasional field failures we’ve determined can be fixed going forward by reducing the capacitance, but we would like to avoid spinning the board. Although there are other members of the same series, in the same package, with lower capacitance, we’d also ideally like to replace this Tantalum with a non-Tantalum drop-in if at all possible in the very odd package size/footprint.
Can any of the part gurus at Digi-Key find me a non-Tantalum capacitor that we could drop in with a 10V or higher rating that’s somewhere between roughly 33uF to 100uF?
I was able to locate some good options and have them on the link below. I had to open the voltage up to get some that can be ordered in smaller than 1k minimum quantities. The size remained the same within reason.
Yes but a drop in as well so that is the best link I can get for you with a drop in option and lower uf ratings than your original. The footprint of 2824 (7260 Metric) limits the options I can see.
Maybe someone else can locate some better option than i can.
Depending on the pad size and foot print designed on to the PCB, there might be a capacitor that may work as an alternative for you. But if you are limited to 2824 (7260 metric), the capacitance range you supplied is going to keep Tantalum capacitors as the only option.
There’s some ceramics available that are fairly close in size. I might be inclined to consider the J-lead types first, as risk of cracking due to board flexure increases with device size.
There’s some tant polys with a close-ish outline, some aluminum polys too. One would probably want to talk with the assembly folks as to the feasibility of using some of these with the existing footprint, but larger devices seem to be a bit more forgiving in that respect than the sort one might mistake for salt.
And one would probably want to evaluate those options on their finer points also; a $5 SMT capacitor isn’t the sort of thing most folks would choose without some sort of motivation.
Thanks Rick, I was actually going down this path myself and looking pretty hard at 445-172988-2-ND and considering starting a conversation with our internal process engineers about if we can make it work on the existing pads without a board spin.
The length of the 7563 ceramic on the tantalum pads should be fine, the pads would just be a little long in both directions and possibly allow the ceramic placement to drift a bit in either direction lengthwise (probably not a big deal). The width is probably the “gotcha”, as the typical is exactly the same as the width of the suggested tantalum pad, but with the plus tolerance on the width it would extend a bit past, which may be an issue.
And yes, a $3 (in bulk) ceramic isn’t ideal, but it’s not so bad when you are replacing a $5 (in bulk) tantalum.
The lower ESR is also a potential plus as it’s on the output of a buck regulator, would just have to adjust the compensation to accommodate the lower capacitance and lower ESR.
