The manufacturer uses a new body style which incorporates fins into the body of the resistor, creating an additional surface area to the resistor body without having to enlarge the footprint. The 5W and 7W ratings which Ohmite are assigning to these two new sizes are claimed to be very conservative, and in testing over 1000 hours of continuous operation, the resistance drift is negligible (less than 1%), allowing customers to specify very tight tolerances along with the new, higher power ratings. A couple of fins have been removed to allow for a flat zone on the top-centre of the resistor to enable its use on pick and place equipment.
Visit Ohmite at www.ohmite.com
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