Operating and Storage Junction Temperature Range: -55 to +150 °C
Package: TO-220
Pinout of 2SD525
Here is an image showing the pin diagram of this transistor.
Classification of hFE
The 2SD525 transistor can have a current gain of 40 to 240. The gain of the 2SD525-O will be in the range from 70 to 140, for the 2SD525-R it will be in the range from 40 to 80, for the 2SD525-Y it will be in the range from 120 to 240.
Marking
Sometimes the "2S" prefix is not marked on the package - the 2SD525 might only be marked "D525".
Complementary PNP transistor
The complementary PNP transistor to the 2SD525 is the 2SB595.
SMD Version of 2SD525 transistor
The BDP953 (SOT-223) is the SMD version of the 2SD525 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.