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National Semiconductor
National Semiconductor

LM431 Datasheet

Adjustable Precision Zener Shunt Regulator


LM431 Datasheet Preview


December 1999
LM431
Adjustable Precision Zener Shunt Regulator
General Description
The LM431 is a 3-terminal adjustable shunt regulator with
guaranteed temperature stability over the entire temperature
range of operation. It is now available in a chip sized pack-
age (4-Bump micro SMD) using National’s micro SMD pack-
age technology. The output voltage may be set at any level
greater than 2.5V (VREF) up to 36V merely by selecting two
external resistors that act as a voltage divided network. Due
to the sharp turn-on characteristics this device is an excel-
lent replacement for many zener diode applications.
Features
n Average temperature coefficient 50 ppm/˚C
n Temperature compensated for operation over the full
temperature range
n Programmable output voltage
n Fast turn-on response
n Low output noise
n LM431 in micro SMD package
Connection Diagrams
TO-92: Plastic Package
SOT-23: 3-Lead Small Outline
Top View
DS010055-1
SO-8: 8-Pin Surface Mount
Top view
DS010055-2
Top View
DS010055-28
4-Bump micro SMD
DS010055-54
Top View
(bump side down)
© 1999 National Semiconductor Corporation DS010055
www.national.com
Page 1

Ordering Information
Package Typical Accuracy Order Number/Package Marking
0.5%
1%
2%
TO-92
LM431CCZ/ LM431BCZ/ LM431ACZ/
LM431CCZ LM431BCZ LM431ACZ
LM431CIZ/
LM431CIZ
LM431BIZ/
LM431BIZ
LM431AIZ/
LM431AIZ
SO-8
LM431CCM/ LM431BCM/ LM431ACM/
431CCM
431BCM
LM431ACM
LM431CIM/
431CIM
LM431BIM/
431BIM
LM431AIM/
LM431AIM
SOT-23
LM431CCM3/ LM431BCM3/ LM431ACM3/
N1B N1D N1F
LM431CIM3 LM431BIM3 LM431AIM3
N1A N1C N1E
micro SMD
LM431AIBP
LM431AIBPX(Note 1)
Temperature
Range
0˚C to +70˚C
−40˚C to +85˚C
Transport Media
Rails
NSC
Drawing
Z03A
0˚C to +70˚C
−40˚C to +85˚C
Rails and Tape &Reel
M08A
0˚C to +70˚C
−40˚C to +85˚C
Rails and Tape &Reel
MA03B
−40˚C to +85˚C 250 Units Tape and Reel BPA04AFA
3k Units Tape and Reel
Note 1: The micro SMD package marking is a 2 digit manufacturing Date Code only
micro SMD Top View Marking Example
DS010055-56
The LM431 micro SMD Package will be marked with a two digit date manufacturing code. The underline indicates the bottom of
the marking. Pin one will be placed at the bottom left hand corner, and the rest of the pin numbers will follow counter-clockwise.
www.national.com
2
Page 2

Symbol and Functional Diagrams
DS010055-99
DC Test Circuits
DS010055-55
DS010055-4
FIGURE 1. Test Circuit for VZ = VREF
DS010055-5
Note: VZ = VREF (1 + R1/R2) + IREFR1
FIGURE 2. Test Circuit for VZ > VREF
DS010055-6
FIGURE 3. Test Circuit for Off-State Current
3 www.national.com
Page 3
Part Number LM431
Manufactur National Semiconductor
Description Adjustable Precision Zener Shunt Regulator
Total Page 13 Pages
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LM431 , LM431 , LM431 , LM431 , LM431A , LM431AC , LM431ACM , LM431ACM , LM431ACM , LM431ACM3N1F , LM431ACMD , LM431ACN , LM431ACZ , LM431ACZ , LM431ACZ , LM431ACZU , LM431AIBP , LM431AIBPX , LM431AIM , LM431AIM , LM431AIM3N1E , LM431AIZ , LM431AIZ , LM431B , LM431BCM , LM431BCM , LM431BCM3N1D , LM431BCZ , LM431BCZ , LM431BIM , LM431BIM , LM431BIM3N1C , LM431BIZ , LM431BIZ , LM431C , LM431CCM , LM431CCM , LM431CCM3N1B , LM431CCZ , LM431CCZ , LM431CIM , LM431CIM , LM431CIM3N1A , LM431CIZ , LM431CIZ , LM431SA , LM431SACMF , LM431SACML , LM431SBCMF , LM431SBCML , LM431SCCMF , LM431SCCML , LM432 , LM432MA , LM432MAX , LM43602 , LM43603 ,

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