Texas Instruments LM431ACM3

V-Ref Adjustable 2.495V to 37V 100mA 3-Pin SOT-23 T/R
Two Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PDSO3
Adjustable Precision Zener Shunt Regulator 3-SOT-23 -40 to 85
SHUNT REG ADJ 3/36V, SOT-23-3, 431; Topology:Shunt, Adjustable; Reference Voltage Tolerance:55mV; Temperature Coefficient:± 50ppm/°C; Voltage Reference Case Style:SOT-23; No. of Pins:3; Operating Temperature Range:0°C to 70°C; SVHC:No SVHC (19-Dec-2011); Accuracy %:2%; Base Number:431; Cathode Current Ik Max:100mA; Cathode Voltage Vka Max:37V; IC Generic Number:431; IC Package (Case style):SOT-23; IC Temperature Range:Commercial; Input Voltage Max:36V; Input Voltage Min:3V; Logic Function Number:431; Operating Temperature Max:70°C; Operating Temperature Min:0°C; Operating Voltage Tolerance :2%; Output Current Max:100mA; Output Voltage:37V; Output Voltage Max:36V; Output Voltage Min:2.5V; Package / Case:SOT-23; Reference Voltage & Age Tolerance:2%; Temperature Coeff Over Temp Range:8mV; Termination Type:SMD; Voltage Regulator Type:Positive Adjustable
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 package (4-Bump micro SMD) using National's micro SMD package 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 excellent replacement for many zener diode applications.