© 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

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

Cathode Voltage

37

V

Cathode Current Range (Continuous)

-100 ~ +150

mA

Reference Input Current Range

-0.05 ~ +10

mA

Power Dissipation

TO-92, 8-SOIC Packages

770

mW

Thermal Resistance, Junction to Ambient

TO-92, 8-SOIC Packages

160

°C/W

Operating Temperature Range LM431xC

-25 ~ +85

°C

Operating Temperature Range LM431xI

-40 ~ +85

°C

Junction Temperature

150

°C

Storage Temperature Range

-65 ~ +150

°C

Symbol

Parameter

Min.

Max.

Unit

Cathode Voltage

36

V

Cathode Current

1.0

100

mA

CATHODE

ANODE

REFERENCE

CATHODE (K)

ANODE (A)

REFERENCE (R)

2.5 Ref

+

-