Hi guys, I have a question about the B220A-13 diode. Here is the datasheet:

B220A-13

I need it to absorb negative spikes, but since it is used in a battery-powered system, I am afraid that the reverse leakage current is too high, even though it is rated for VR voltage. Are there any diodes with the same characteristics but with a very low leakage current for use with batteries?

PS: It is placed at the output of an eFuse at a 5V output voltage.

 

If someone is going to go to the trouble of trying to help you find a diode with a sufficiently low leakage current, doesn't it make sense for you to tell them how low the leakage current needs to be in order to be sufficiently low?

 

@WBahn

You are right, sorry!
Less than 80uA.

Thanks for your support!

 

The 30V version of that diode has ≈3µA leakage @5V (below) at room ambient.
Edit: The leakage typically doubles for every 10°C increase in temperature.

 

@crutschow

True. Reading too many datasheets went to my head!Thank you!

 

Depends a lot on the impedance of the node where it is connected.
Several moons ago I required the protect a analog buffer input. A pair of Schottky diodes, correct? Not so fast, the source impedance was 1 Meg, and as shown in the plot provided by Cruts, even at ambient temperature, the leakage created a voltage offset which swamped the signal to be monitored.

As a rule of thumb, utilize a diode with a reverse withstanding voltage at least twice, better thrice, the maximum expected voltage. Additionally choose a diode with the smallest current carrying capability consistent with adequate margins, and if possible keep the diode the farthest away from heat sources.

But one thing is certain, a Schottky will never have a leakage current as low as a plain vainilla silicon junction diode

 

Depends a lot on the impedance of the node where it is connected.

True.
But the node the TS is connecting it to (below), is likely low impedance.

It is placed at the output of an eFuse at a 5V output voltage.

 

You are right, Cruts.
I was mentioning the general scope of diode leakage.

 

but... what is the actual circuit? perhaps diode could be replaced with something else (a mosfet).