Operating and Storage Junction Temperature Range: -55 to +150 °C
Package: TO-251
Pinout of 2SD1801-U
Here is an image showing the pin diagram of this transistor.
Classification of hFE
The 2SD1801-U transistor can have a current gain of 280 to 560. The gain of the 2SD1801 will be in the range from 100 to 560, for the 2SD1801-R it will be in the range from 100 to 200, for the 2SD1801-S it will be in the range from 140 to 280, for the 2SD1801-T it will be in the range from 200 to 400.
Marking
Sometimes the "2S" prefix is not marked on the package - the 2SD1801-U might only be marked "D1801-U".
Complementary PNP transistor
The complementary PNP transistor to the 2SD1801-U is the 2SB1201-U.
SMD Version of 2SD1801-U transistor
The 2SD1615 (SOT-89), 2SD1622 (SOT-89), 2SD1622-U (SOT-89), 2SD1623 (SOT-89), 2SD1623-U (SOT-89) and 2STR1160 (SOT-23) is the SMD version of the 2SD1801-U transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.
Replacement and Equivalent for 2SD1801-U transistor