Reference document for the 2SD1662 transistor, 137 KB, PDF format, placed in the schematic category. The name holds only the part code, which follows the JIS pattern where 2SD marks an NPN bipolar device for low-frequency or power use. Look inside for the ratings table, characteristic curves and mechanical drawing. Practical uses include confirming pin order before replacement and comparing breakdown voltage and current against candidate substitutes. The component may be printed as D1662 without the 2S prefix.
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