Automotive Zener Diode Protection

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This topic has 4 replies, 3 voices, and was last updated 10 years, 10 months ago by AJISH ALFRED.

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June 21, 2014 at 12:43 am #3125

James Finnegan
Participant

Some help required Plz….Using 555 timers in a automotive application should I use a zener diode to protect the timers ?

Thanks

June 23, 2014 at 10:32 am #11845

Ashutosh Bhatt
Participant

IC555 can work upto 15 V. see its datasheet for absolute maximum ratings.

June 23, 2014 at 10:47 am #11846

James Finnegan
Participant

Thanks for replying….Yes but I’m concerned about spikes and voltage transients above 15v which might damage the 555 timers.

Cheers

June 25, 2014 at 9:11 am #11848

Ashutosh Bhatt
Participant

use capacitor filters in power supply rail.

u can also use good voltage regulators as 78XX ICs

July 10, 2014 at 4:46 am #11886

AJISH ALFRED
Participant

Hi,

Like A.M.Bhutt suggest, use a 78xx regulator IC, and connect very low valued capacitors like 0.1mfd parallel with the filter capacitors in the regulator circuit to avoid voltage spikes. However there is no need at all to worry about the voltage spikes affecting a 555 IC.
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