View ap431-series datasheet:

AP431/AP431A ADJUSTABLE PRECISION SHUNT REGULATOR Features General Description The AP431 and AP431A are 3-terminal adjustable precision • Precision reference voltage shunt regulators with guaranteed temperature stability over the AP431 : 2.495V ± 1% applicable extended commercial temperature range. The output AP431A : 2.495V ± 0.5% voltage may be set at any level greater than 2.495V (VREF) up to • Sink current capability: 200mA 36V merely by selecting two external resistors that act as a • Minimum cathode current for regulation: 300µA voltage divider network. These devices have a typical output • Equivalent full-range temp coefficient: 30 ppm/oC impedance of 0.2Ω. Active output circuitry provides very sharp • Fast turn-on response