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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 0.25Ω. 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-Ω typical output impedance


* -40°C ~ 125°C specifications

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