This post explains for the transistor.
The Part Number is 2SD2144, 2SD2144K.
The function of this semiconductor is 20V, 0.5A, NPN Transistor.
Manufacturer: Rohm
Preview images:
Description
This is High-current Gain Medium Power Transistor (20V, 0.5A). D2144 is a type of bipolar junction transistor (BJT) that consists of two n-type semiconductor materials separated by a single p-type material.
Features
1. High DC current gain. hFE = 1200 (Typ.)
2. High emitter-base voltage. VEBO = 12V (Min.)
3. Low VCE(sat). VCE(sat) = 0.18V (Typ.) (IC / IB = 500mA / 20mA)
Absolute maximum ratings ( Ta=25°C )
1. Collector to Base Voltage: Vcbo = 25 V
2. Collector to Emitter Voltage: Vceo = 20 V
3. Emitter to Base Voltage: Vebo = 12 V
4. Collector Current: Ic = 0.5 A
5. Collector Dissipation : Pc = 0.2 W
6. Junction Temperature: Tj = 150°C
7. Storage Temperature: Tsg = -55 ~ +150°C
Structure:
1. Epitaxial planar type NPN silicon transistor
D2144 PDF Datasheet
