Timeline for Trying to work out reverse saturation current for diode using shockley diode equation
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| May 4, 2021 at 3:09 | review | First posts | |||
| May 9, 2021 at 17:16 | |||||
| Apr 25, 2021 at 22:58 | comment | added | jonk | Dean, See here. The saturation current is the \$y\$-axis intercept when you extrapolate the line formed by the diode's ln(current) vs voltage chart (when the bulk resistance can be ignored.) There's a BJT chart that kind of gets the idea across here. | |
| Apr 25, 2021 at 19:59 | comment | added | a concerned citizen |
Vd is not the supply voltage, it's the voltage drop across the diode. See the Wikipedia article. But, yes, Is can be very small, typically 1 pA ... 1 nA (more or less, depending on the diode).
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| Apr 25, 2021 at 18:33 | comment | added | The Photon | Hint: what happens to the exponential term when \$V_D\$ is very large and negative? | |
| Apr 25, 2021 at 18:04 | comment | added | TimWescott | Please say what diode you're using. 42mA at 5V isn't consistent with any diode that I know of on the market, so please give us a schematic of your circuit. If you can't do that -- a drawing or a photo, please. | |
| Apr 25, 2021 at 17:14 | history | asked | Dean | CC BY-SA 4.0 |