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LM431ACM3-LM431ACM3X-LM431ACMX-LM431ACZ-LM431AIBP-LM431AIBPX-LM431AIM-LM431AIM3-LM431AIM3X-LM431AIMX-LM431AIZ-LM431BCM3-LM431BCM3X-LM431BCMX-LM431BIM3-LM431BIM3X-LM431BIMX-LM431CCM-LM431CCM3-LM431CCM3X-LM431CCMX-LM431CIM-LM431CIM3-LM431CIM3X-LM431C
Adjustable Precision Zener Shunt Regulator
LM431
Adjustable Precision Zener Shunt Regulator
General DescriptionThe LM431isa 3-terminal adjustable shunt regulator with
guaranteed temperature stability overthe entire temperature
rangeof operation.Itis now availableina chip sized pack-
age (4-Bump micro SMD) using National’s micro SMD pack-
age technology. The output voltage maybesetat any level
greater than 2.5V (VREF)upto 36V merelyby selecting two
external resistors thatactasa voltage divided network. Due the sharp turn-on characteristics this deviceisan excel-
lent replacementfor many zener diode applications.
Features Average temperature coefficient50 ppm/˚C Temperature compensatedfor operation overthefull
temperature range Programmable output voltage Fast turn-on response Low output noise LM431in micro SMD package See AN-1112for micro SMD considerations
Connection Diagrams
Note: *NC=Not internally connected. Mustbe electrically isolated fromthe
restofthe circuitforthe microSMD package.
TO-92: Plastic PackageDS010055-1
Top View
SO-8: 8-Pin Surface MountDS010055-2
Top view
SOT-23: 3-Lead Small OutlineDS010055-28
Top View
4-Bump micro SMDDS010055-54
Top View
(bump side down)March 2002
LM431
Adjustable
Precision
Zener
Shunt
Regulator
