Data Sheet

LM431A / LM431B / LM431C — Programmable Shunt Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM431A / LM431B / LM431C Rev. 1.2.0 2
Block Diagram
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at T
A
= 25°C unless otherwise noted.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol Parameter Value Unit
V
KA
Cathode Voltage 37 V
I
KA
Cathode Current Range (Continuous) -100 ~ +150 mA
I
REF
Reference Input Current Range -0.05 ~ +10 mA
P
D
Power Dissipation
TO-92, 8-SOIC Packages
770 mW
R
θjA
Thermal Resistance, Junction to Ambient
TO-92, 8-SOIC Packages
160 °C/W
T
OPR
Operating Temperature Range LM431xC -25 ~ +85 °C
Operating Temperature Range LM431xI -40 ~ +85 °C
T
J
Junction Temperature 150 °C
T
STG
Storage Temperature Range -65 ~ +150 °C
Symbol Parameter Min. Max. Unit
V
KA
Cathode Voltage V
Ref
36 V
I
KA
Cathode Current 1.0 100 mA
CATHODE
ANODE
REFERENCE
CATHODE (K)
ANODE (A)
REFERENCE (R)
2.5 Ref
+
-