Texas Instruments LM431AIZ/NOPB

2%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator 3-TO-92 -40 to 85
V-Ref Adjustable 2.495V to 37V 100mA 3-Pin TO-92 Bulk
Two Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PBCY3
Shunt Voltage Regulator IC; Termination Type:Through Hole; Package/Case:3-TO-92; No. of Pins:3; Peak Reflow Compatible (260 C):Yes; Current Rating:0.1A; Input Voltage Primary Max:37V; Mounting Type:Through Hole; Output Current:15mA ;RoHS Compliant: Yes
IC, SHUNT REG, ADJ, 100MA, TO92; Topology:Shunt, Adjustable; Reference Voltage:2.5V; Reference Voltage Tolerance:55mV; Voltage Reference Case Style:TO-92; No. of Pins:3; Operating Temperature Range:-40°C to 85°C; SVHC:No SVHC (20-Jun-2011); Accuracy %:2%; Base Number:431; Cathode Current Ik Max:100mA; Cathode Voltage Vka Max:37V; Input Voltage Max:37V; Operating Temperature Max:85°C; Operating Temperature Min:-40°C; Output Current Max:100mA; Output Voltage Max:36V; Output Voltage Min:2.5V; Package / Case:TO-92; Reference Voltage & Age Tolerance:2%; Voltage Regulator Type: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.