Operating and Storage Junction Temperature Range: -55 to +125 °C
Package: TO-126
Pinout of 2SD1681-R
Here is an image showing the pin diagram of this transistor.
Classification of hFE
The 2SD1681-R transistor can have a current gain of 100 to 200. The gain of the 2SD1681 will be in the range from 70 to 400, for the 2SD1681-Q it will be in the range from 70 to 140, for the 2SD1681-S it will be in the range from 140 to 280, for the 2SD1681-T it will be in the range from 200 to 400.
Marking
Sometimes the "2S" prefix is not marked on the package - the 2SD1681-R might only be marked "D1681-R".
Complementary PNP transistor
The complementary PNP transistor to the 2SD1681-R is the 2SB1141-R.
SMD Version of 2SD1681-R transistor
The BCX68 (SOT-89) and BCX68-16 (SOT-89) is the SMD version of the 2SD1681-R transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.
Replacement and Equivalent for 2SD1681-R transistor