# How do I leave electrical connection of heat-sink body?

I usually see that some heat-sinks have thick pins to solder on the PCB, and I'm going to use one of them. Since they are going to be soldered on the PCB, the question rises in my mind about their electrical connection.

My ideas are:

• Connect them to the ground:
• Directly
• By a large resistor (>1M$\Omega$)
• By a capacitor
• By a large resistor parallel to a capacitor
• By a small resistor in series with a capacitor
• By a small resistor in series with parallel connection of a large resistor and a capacitor
• Connect all heat-sinks in the circuit to a separate ground
• Leave them unconnected

What is the best solution?

And, if I should connect the heat-sink pin(s) to somewhere, should I connect only one or all of them?

(Note: The circuit element to be cooled is electrically isolated from the heat-sink body.)

• Are those really meant for electrical connections? In the past, I've seen connections similar to that for soldering components for stability; no electrical connection. The actual pads were electrically isolated from the rest of the traces.. – Shabab Nov 19 '13 at 21:24