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)
TOP VIEW
3 PIN PLASTIC TO-92 (Z)
BOTTOM VIEW
1
2
8 PIN PLASTIC SOIC (S)
TOP VIEW
NC
1
NC
2
Cathode
3
5
Anode
Ref
Anode
Cathode
Cathode
Anode
1
8
Ref
7
NC
6
Anode
5
NC
NC
2
3
4
Ref
3
NC
4
θ
JA
= 450°C/W
θ
JA
= 162°C/W
θ
JA
=160°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over Ta=0 to 70
°C,
C
O
=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
SYM
TEST CONDITION
MIN
TYP MAX
UNITS
Reference Voltage
Vref
I
K
=10mA,V
KA
=Vref,Ta=25°C
1.228 1.240 1.252
V
US431L
I
K
=10mA,V
KA
=Vref
1.221 1.240 1.259
Reference Voltage
Vref
I
K
=10mA,V
KA
=Vref,Ta=25°C
1.234 1.240 1.246
V
US431AL
I
K
=10mA,V
KA
=Vref
1.228 1.240 1.252
Vref deviation over full
Vref(dev) V
KA
=Vref, I
K
=10mA
4
12
mV
temperature range
Note 1
Ratio of Vref change to dVref/dV
KA
I
K
=10mA , dV
KA
=Vref to 6 V
-1.5
-2.7
mV/V
Cathode voltage change
Reference pin current
I
K
=10mA , R1=10kΩ , R2=open
0.15
0.5
uA
Iref deviation over full
Iref(dev)
I
K
=10mA , R1=10kΩ , R2=open
0.05
0.3
uA
temperature range
Note 1
Minimum cathode current I
K
(min)
V
KA
=Vref
55
80
uA
Off state cathode current
Ioff
V
KA
=6V , Vref=0V
0.001
0.1
uA
Dynamic impedance
Zka
0
V
KA
=Vref, f<1 kHz,
0.25
0.4
Ω
I
K
=0.1 to 15 mA , Note 2
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 :
Vref ( dev)
6
×
10
Vref ( 25
°
C)
α
Vref
=
∆
T
A
Where:
α
Vref unit is ppm/
°
C
∆
T
A
is the rated operating free air temperature
of the device.
α
Vref can be positive or negative depending on whether
minimum Vref or maximum Vref, respectively occurs at the
lower temperature.
Note 2 :
Thedynamic impedance when VKA = Vref is defined as :
∆
VKA
∆
IK
When the device is operating with two external
Zka0
=
resistors (see Figure 2), the total dynamic impedance
of the circuit is given by:
Zka
=
∆
V
R1
=
Zka0
×
1
+
∆
I
R2
2-2
Rev. 1.2
5/11/98
UNISEM [ UNISEM ]
