In theory, the glass shell package is 0.5W18V, but I suggest that you choose a full power 0.5W18V on the market commonly used 0.26M\/M0.28M\/M to claim 0.5W, and in fact, the full power 0.5W chip size is 0.35M\/MM for heavy power regulator diodes should pay attention to this point and even if you choose 1.0W regulator diodes, inside It is doubtful whether the surface chip will be more or less the CZD0.5W18V is known to use a full power regulator diode of 0.35M\/M