SMA540B
DESCRIPTION
The SMA540B is a NPN Transistor integrating a current mirror as biasing. In this way the IC (collector current) can be controlled setting the current at Bias pin according to IC = 10
- IBIAS. The IBIAS current is easy adjustable using an external resistor. SMA540B is housed in ultra miniature SOT323-4L package(LEAD FREE), the relative dimensions are 1.15mmx1.8mm with 0.8mm thickness. ABSOLUTE MAXIMUM RATINGS
Symbol Vceo Vebo Ic Ib IBIAS Ptot Top Tstg Tj Collector emitter voltage Emitter base voltage Collector current Base current BIAS Current Total dissipation, Ts = 107 Operating temperature Storage temperature Max. operating junction temperature o C
B, 1
E, 2
Parameter
Value 4.5 1.5 40 4 4 120 -40 to +85 -65 to +150 150
Unit V V m A m A m A m W o C o C o
THERMAL RESISTANCE
Rthjs Thermal Resistance Junction soldering point < 270 o C/W
January, 15 2003
1/4
ELECTRICAL CHARACTERISTICS (TA=25 o C,ZL/S = 50Ω, tested in circuit shown in fig.1, unless otherwise...
