A heat dissipating apparatus (10) includes a plurality of fins (20) stacked together along a predetermined direction, and a plurality of projection members (23) extending from each fin. Each of the fins includes a main body (22). The main bodies of two adjacent fins define an air passage (29) therebetween. The projection members of a first fin abut against the main body of a second fin, for dividing the air passage into a plurality of small air channels.

 
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