This is one of the MOSFET types. This is a kind of the transistor.
Part Number : K5A50D, TK5A50D
Function : TOSHIBA Field Effect Transistor Silicon N Channel MOS Type
Package : TO220F Type
Manufacturers : Toshiba
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Description :
Search Part number : K5A50D -> Correct Part number : TK5A50D
1. Low drain-source ON-resistance: RDS (ON)= 1.3 Ω(typ.)
2. High forward transfer admittance: ⎪Yfs⎪= 3.0 S (typ.)
3. Low leakage current: IDSS= 10 μA (max) (VDS= 500 V)
4. Enhancement mode: Vth= 2.4 to 4.4 V (VDS= 10 V, ID= 1 mA)
Pinout
K5A50D Datasheet PDF
Other data sheets within the file : K5A500, TK5A500, TK5A50D