Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Storage Temperature Range b65§Ctoa
150§C
Operating Temperature Range
Industrial (LM431xI) b40§Ctoa
85§C
Commercial (LM431xC) 0§Ctoa
70§C
Lead Temperature
TO-92 Package/SO-8 Package/SOT-23 Package
(Soldering, 10 sec.) 265§C
Internal Power Dissipation (Notes 1, 2)
TO-92 Package 0.78W
SO-8 Package 0.81W
SOT-23 Package 0.28W
Cathode Voltage 37V
Continuous Cathode Current b10 mA to a150 mA
Reference Voltage b0.5V
Reference Input Current 10 mA
Operating Conditions Min Max
Cathode Voltage VREF 37V
Cathode Current 1.0 mA 100 mA
Note 1: TJ Max e150§C.
Note 2: Ratings appy to ambient temperature at 25§C. Above this tempera-
ture, derate the TO-92 at 6.2 mW/§C, the SO-8 at 6.5 mW/§C, and the
SOT-23 at 2.2 mW/§C.
LM431
Electrical Characteristics TAe25§C unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
VREF Reference Voltage VZeVREF,I
Ie10 mA 2.440 2.495 2.550 V
LM431A
(Figure 1)
VZeVREF,I
Ie10 mA 2.470 2.495 2.520 V
LM431B
(Figure 1)
VZeVREF,I
Ie10 mA 2.485 2.500 2.510 V
LM431C
(Figure 1)
VDEV Deviation of Reference Input VZeVREF,I
Ie10 mA, 8.0 17 mV
Voltage Over Temperature (Note 3) TAeFull Range
(Figure 1)
DVREF
DVZ
Ratio of the Change in Reference IZe10 mA VZfrom VREF to 10V b1.4 b2.7 mV/V
Voltage to the Change in Cathode
(Figure 2)
VZfrom 10V to 36V b1.0 b2.0
Voltage
IREF Reference Input Current R1e10 kX,R
2e%
,2.0 4.0 mA
IIe10 mA
(Figure 2)
*IREF Deviation of Reference Input Current R1e10 kX,R
2e%
,
over Temperature IIe10 mA, 0.4 1.2 mA
TAeFull Range
(Figure 2)
IZ(MIN) Minimum Cathode Current for VZeVREF
(Figure 1)
0.4 1.0 mA
Regulation
IZ(OFF) Off-State Current VZe36V, VREF e0V
(Figure 3)
0.3 1.0 mA
rZDynamic Output Impedance (Note 4) VZeVREF, LM431A, 0.75 X
Frequency e0Hz
(Figure 1)
VZeVREF, LM431B, LM431C 0.50 X
Frequency e0Hz
(Figure 1)
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