This post explains for the NPN Transistor.
The Full Part Number is D1761, 2SD1761.
The function of this semiconductor is 60V, 3A, NPN Transistor.
The package is TO-220FP Type
The manufacturers of this product is Rohm.
See the preview image and the PDF file for more information.
Preview images :
This is 60V, 3A, Triple Diffused Planar NPN Silicon Transistor.
1. Low collector saturation voltage
2. Excellent current characteristics of DC current gain
3. Large collector dissipation : Pc = 30 W
4. Complementary pair with 2SB1187
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 80 V
2. Collector to Emitter Voltage: Vceo = 60 V
3. Emitter to Base Voltage: Vebo = 5 V
4. Collector Current: Ic = 3 A
5. Collector Dissipation : Pc = 30 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C