I need help in selecting the right TVS diode. I am working on a home security system with a D-Link DCS-5222 camera.

I have built an IR LED array to provide night illumination. The IR LED array is powered by 12VDC and uses about 1000mA. I want to use a relay to power the IR LED array only when motion is detected. The camera had DI/DO pins. The user manual has some instructions about usin the DO pins with external relay. See below.

I am seeking help in selecting the right diode and relay. Any help will be greatly appreciated.

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    \$\begingroup\$ What makes you think you need a TVS diode at all? The LEDs themselves are diodes; damage from ESD isn't terribly likely. \$\endgroup\$ – Nick Johnson Nov 4 '15 at 10:35
  • \$\begingroup\$ I was just going by the instructions in the manual. If I can safely omit the TVS, that would be nice. Any advise I am considering a relay with the following specs. Any advise about that? One (1) SRD-12VDC-SL-C 4 Relay Module Board Features: 4-Channel, Compatible High/Low level Trigger Coil Voltage: DC 12V Pole Number: 4 Channel Load: 10A, AC 250V/125V, DC 30V/28V \$\endgroup\$ – laserman2431 Nov 4 '15 at 10:53
  • \$\begingroup\$ Well, what does it say in the manual about TVSes? We can't read it from here. If you have another question, you should post it separately. \$\endgroup\$ – Nick Johnson Nov 4 '15 at 11:13
  • \$\begingroup\$ @laserman I think TVS diode recommended as a flywheel diode for relay. Is it? \$\endgroup\$ – GR Tech Nov 4 '15 at 11:15
  • \$\begingroup\$ Thanks for the help. There is no other information in the manual. \$\endgroup\$ – laserman2431 Nov 4 '15 at 11:31

You need a flywheel/flyback diode like simple 1N4001.


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