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                  Home > Shunt Reference Regulators
                  ULVH431 Datasheet







                  The UTC ULVH431 is a low-voltage 3-terminal programmable

                  shunt regulator with guaranteed thermal stability over full applicable

                  industrial and commercial temperature ranges.

                  The output voltage of UTC ULVH431 can be set to any value

                  between VREF (1.24V) and the corresponding maximum cathode

                  voltage (18V) with two external resistors. The device operates from

                  a lower voltage (1.24V) than the widely used TL431 and TL1431

                  shunt-regulator references.

                  The UTC  ULVH431 is an ideal voltage reference in isolated

                  feedback circuits for 3-V to 3.3-V switching-mode power supplies

                  when it is used with an opto-coupler. It has a typical output

                  impedance of 0.25?. Active output circuitry supplies a very sharp

                  turn-on characteristic, which makes the UTC ULVH431 very good

                  substitute for low-voltage Zener diode in many applications such as

                  adjustable power supplies and on-board regulation.




                  * Adjustable output voltage, VO=VREF to 18 V

                  * Low-Voltage operation: VREF= 1.24 V

                  * Wide operating cathode current range: 100µA to 50mA

                  * Reference voltage tolerances at 25°C

                  * 0.25-? typical output impedance


                  * -40°C ~ 125°C specifications

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