Timeline for Why did Axial Capacitors Fall Out of Use in the Industry?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Mar 28, 2022 at 9:23 | comment | added | Criticizing Israel not allowed | obvious follow-up: why don't we see radial resistors? | |
| Apr 22, 2021 at 23:20 | comment | added | supercat | @CristobolPolychronopolis: By my understanding, if one applies a constant current to the leads of an axial cap, then within its operating voltage range, then after an initial jump caused by inductance and resistance, the voltage across the cap will change at a constant rate. With a radial cap, however, the change in voltage will start slower but accelerate. | |
| Apr 22, 2021 at 20:41 | comment | added | Cristobol Polychronopolis | @supercat Correct, the series resistance is primarily internal, particularly with your polarized parts. The contribution of the leads to resistance is usually negligible, their main effect is the inductance. | |
| Apr 22, 2021 at 15:54 | comment | added | supercat | @CristobolPolychronopolis: Even if the inductance comes from leads, I would think most of the effective series resistance of electrolytic capacitors is internal; if it weren't, the easiest way to reduce resistance would be to use lower-resistance leads. | |
| Jan 10, 2020 at 20:39 | vote | accept | 比尔盖子 | ||
| Jan 9, 2020 at 17:23 | comment | added | Cristobol Polychronopolis | @leftaroundabout I was talking mainly about nonpolarized caps...electrolytics and tantalums are usually too slow to worry about RF effects. | |
| Jan 9, 2020 at 15:49 | comment | added | leftaroundabout | Radials use less PCB area, but obviously this comes at the cost of taller height. And @CristobolPolychronopolis the extra inductance is unlikely to be very relevant for electrolytic caps. If anything, it's the antenna effect that's a problem. | |
| Jan 8, 2020 at 21:45 | comment | added | Chloe | It's also easier to see a blown capacitor standing on end because the center button will be popped out. I don't know what a bad axial capacitor looks like. | |
| Jan 8, 2020 at 16:33 | comment | added | Cristobol Polychronopolis | @supercat: A large part of the series inductance in a cap comes from the leads, most of the rest comes from the cap body. It can be modeled as a simple LRC instead of a ladder for lumped analysis. A "modern" geometry is usually a smaller surface mount device with endcaps or J-leads and has less inductance...but you also have to take into account the inductance of the traces leading to the cap, so keep them short. | |
| Jan 8, 2020 at 16:11 | comment | added | supercat | @CristobolPolychronopolis: From my understanding, a cap behaves like a "ladder" whose sides have resistance and inductance and whose rungs are ideal capacitors; radial caps connect both leads to the same end, while axial caps connect to opposite ends. A radial cap will thus have some parts of the ideal capacitance connected with lower ESR than an axial, but the behavior of an axial cap will be closer to that of one ideal cap in series with a resistive/inductive element. Which behavioral pattern better describes "modern" caps? | |
| Jan 8, 2020 at 15:34 | comment | added | Cristobol Polychronopolis | It's also worth noting that modern capacitor geometries have far less inductance than their leaded counterparts, improving the usable frequency range. | |
| Jan 7, 2020 at 20:05 | history | edited | user16324 | CC BY-SA 4.0 |
added 200 characters in body
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| Jan 7, 2020 at 19:33 | history | answered | user16324 | CC BY-SA 4.0 |