3DD13005MD is a series of high power NPN transistors from a company called Jilin Sino-Microelectronics Co., LTD, the following specifications are listed on the datasheet:
|Ic (Collector Current)||4A|
|Vceo (Collector Emitter Voltage Breakdown)||400V|
|Pc(TO-220HF)* (Maximum Power)||35W|
|Pc(TO-220)* (Maximum Power)||75W|
The * points out that the datasheet separated power ratings based on the packages they had available for this kind of transistor, they listed two types of transistor outline TO-220HF and TO-220.
These lists are generic based on the ratings above (not the full list of potential ratings as that will be particular to each application). Technically, you could use higher current ratings above 4A and higher wattage ratings. The lists narrow down options as close as possible to the original datasheet.
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