US431L/431AL
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) .............................................................
7V
Continuous Cathode Current Range ......................................... -20 mA to +20 mA
Reference Current Range ...................................................... -0.05 mA to 3 mA
Storage Temperature Range ................................ -65°C TO 150°C
Operating Junction Temperature Range ...................... 0°C TO 150°C
PACKAGE INFORMATION
5 PIN SOT 23 (L)
3 PIN PLASTIC TO-92 (Z)
8 PIN PLASTIC SOIC (S)
TOP VIEW
BOTTOM VIEW
TOP VIEW
1
2
3
4
8
7
6
5
Cathode
NC
Ref
1
2
3
5
NC
NC
Anode
1
2
3
Ref
NC
Anode
Cathode
Anode
NC
Anode
NC
4
Cathode
Ref
qJA = 450°C/W
qJA = 162°C/W
qJA=160°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over Ta=0 to 70 °C, CO =1uF. Typical values refer to
Ta=25 °C.Low duty cycle pulse testing are used which keeps junction and case temperatures equal to the
ambient temperature.
PARAMETER
Reference Voltage
US431L
Reference Voltage
US431AL
SYM
Vref
TEST CONDITION
IK=10mA,VKA=Vref,Ta=25°C
IK=10mA,VKA=Vref
IK=10mA,VKA=Vref,Ta=25°C
IK=10mA,VKA=Vref
VKA=Vref, IK=10mA
Note 1
MIN
TYP MAX
UNITS
1.228 1.240 1.252
1.221 1.240 1.259
1.234 1.240 1.246
1.228 1.240 1.252
V
Vref
V
Vref deviation over full
temperature range
Vref(dev)
4
12
mV
Ratio of Vref change to dVref/dVKA IK=10mA , dVKA=Vref to 6 V
Cathode voltage change
-1.5
-2.7
mV/V
Reference pin current
Iref deviation over full
temperature range
IK=10mA , R1=10kW , R2=open
IK=10mA , R1=10kW , R2=open
Note 1
0.15
0.05
0.5
0.3
uA
uA
Iref(dev)
Minimum cathode current IK(min)
VKA=Vref
VKA=6V , Vref=0V
VKA=Vref, f<1 kHz,
IK=0.1 to 15 mA , Note 2
55
0.001
0.25
80
0.1
0.4
uA
uA
W
Off state cathode current
Dynamic impedance
Ioff
Zka0
Note 1 : The deviation parameters, Vref(dev) and Iref(dev) are
defined as the differences between the maximum and the minimum
values obtained over the rated temperature range. The average full
range temperature coeficient of the reference input voltage is de-
fined as :
Note 2 :
Thedynamic impedance when VKA = Vref is defined as :
DVKA
Zka0 =
DIK
When the device is operating with two external
resistors (see Figure 2), the total dynamic impedance
of the circuit is given by:
æ
ç
ö
÷
ø
Vref(dev)
Vref(25°C)
DTA
´ 106
è
a Vref =
DV
DI
R1
R2
æ
ö
Where:
Zka =
= Zka0 ´ 1+
ç
÷
ø
è
a Vref unit is ppm/°C
DTA is the rated operating free air temperature
of the device.
a Vref can be positive or negative depending on whether
minimum Vref or maximum Vref, respectively occurs at the
lower temperature.
Rev. 1.2
5/11/98
2-2
UNISEM [ UNISEM ]
