4 ms·
>> tantalum polymer > I actually kind of hate these guys, I don't find much use for them outside DC-DC converter output capacitors Bulk capacitance in extreme
by dragontamer 4y ago
>> tantalum polymer
> I actually kind of hate these guys, I don't find much use for them outside DC-DC converter output capacitors
Bulk capacitance in extreme battery constrained scenarios?
MLCC has difficulty going above 1uF at reasonable costs... especially when you consider voltage derating. Aluminum is relatively leaky, IIRC like 20uA, or 20x more leakage than MLCC or Tanalums.
Think like bulk capacitance for a CR2032-cell (which has issues serving more than 10mA). Serving an ESP32's 100mA+ current draw for a second or two (and then ESP32 sleeps) kinda thing.
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But not really a "decoupling cap" in this case. Just a bulk cap where Aluminum is disqualified.
- exmadscientist 4y agoI mean, yeah, they have uses. I just struggle to find them. Something else usually wins out. Height-constrained layouts are usually a decent bet, tantalum shines if aluminum can't fit! They do leak pretty badly though. I think it's better than other electrolytics, but it's still not great. Of course, they do tend to do better than spec... until they don't. It's been a while since I've done micropower stuff though, so what do I know.