James C. Squire, Ph.D., P.E.

Transistors

Device

type

polarity

Vmax1

Imax2

RDS3

2N3904

BJT

NPN

40V

200mA

-

2N3906

BJT

PNP

40V

200mA

-

2N7000

FET

NMOS

60V

400mA

2 ohm

IRF510

FET

NMOS

100V

5A

0.5 ohm

IRF540

FET

NMOS

100V

33A

40 mohm

IRF3205

FET

NMOS

55V

110A

8 mohm

 

 

 

 

 

 

 

Notes

  1. Vmax is the maximum VCE for BJT's or VDS for FET's.
  2. Imax is maximum collector current for BJT's or maximum drain current for FET's.
  3. Rds is for FET's when turned on.  Ideally 0 ohms, this specifies how closely the FET looks like a closed switch.