The TLVH431 and TLVH432 devices are low-voltage 3-terminal adjustable voltage references,
with specified thermal stability over applicable industrial and commercial temperature ranges.
Output voltage can be set to any value between VREF (1.24 V) and 18 V with
two external resistors (see ). These devices operate from a lower voltage (1.24 V) than the widely used
TL431 and TL1431 shunt-regulator references.
When used with an optocoupler, the TLVH431 and TLVH432 devices are ideal voltage
references in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies. They have
a typical output impedance of 0.25 Ω. Active output circuitry provides a very sharp turn-on
characteristic, making the TLVH431 and TLVH432 devices excellent replacements for low-voltage Zener
diodes in many applications, including on-board regulation and adjustable power supplies.
The TLVH432 device is identical to the TLVH431 device, but is offered with different
pinouts for the 3-pin SOT-23 and SOT-89 packages.
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