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PICList Thread
'[PIC]: Electrostatic Protection'
2002\03\09@090947 by Tal Bejerano - AMC

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Hi 2 All

I wonder if it's possible to protect circuit (from Electrostatic charge)
that have connectors/wires exposed to air with just a diode to ground?

which diode to use? 1n914,1n4148 or a special one..etc ?

Regards

Tal Bejerano
AMC - ISRAEL

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2002\03\09@162817 by Dwayne Reid

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At 04:06 PM 3/9/02 +0200, Tal Bejerano - AMC wrote:
>Hi 2 All
>
>I wonder if it's possible to protect circuit (from Electrostatic charge)
>that have connectors/wires exposed to air with just a diode to ground?
>
>which diode to use? 1n914,1n4148 or a special one..etc ?

What is the source impedance of the input signal?  Speed?

A single diode will not protect against spikes of both polarities.  That
requires 2 diodes *or* a zener diode or tranzorb.  That's why I asked about
source impedance and speed: Zener diodes have more junction capacitance
than ordinary diodes and tranzorbs have much more capacitance than ordinary
diodes.

Regardless of whether you use 2 small signal diodes or a single
zener/tranzorb as the clamp, you should have a series resistor between the
clamp and the PIC pin.  Value of that resistor also depends on impedance
and speed.

dwayne


Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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