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ZR431FTA

Public Made by Adom

by adom

Diodes Incorporated Voltage Reference, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ZR431FTA

Diodes Incorporated · Voltage Reference · SOT-23-3

ZR431FTA from Diodes Incorporated, in a SOT-23-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VREF power_in Reference input of the adjustable shunt regulator, taken from the external R1/R2 divider; nominal reference voltage is 2.5V (2% tolerance for ZR431FTA).
2 VZ passive Cathode of the shunt regulator; cathode voltage ranges from VREF to 20V (absolute maximum 20V) and cathode current from 0.05mA to 100mA (absolute maximum 150mA).
3 GND power_in Ground (anode) of the shunt regulator; all voltages are specified relative to this pin.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-23-3
Category Power Management (PMIC)
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Reference Voltage (2% tolerance) VREF 2.45 2.5 2.55 V IL = 10mA (Figure 1), VZ = VREF 2
Cathode Current (operating range) IZ 0.05 100 mA 2
Operating Temperature TA -40 125 °C 2
Cathode Voltage (recommended) VZ 20 V 2
Cathode Voltage VZ 20 V 2
Cathode Current IZ 150 mA 2
Junction Temperature Range TJ -40 150 °C 2
Storage Temperature TST -55 150 °C 2
Power Dissipation (SOT23) PD 330 mW SOT23; ratings apply at TA = +25°C (Notes 5, 6) 2
Deviation of Reference Input Voltage over Temperature VDEV 10 30 mV IL = 10mA, VZ = VREF, TA = Full Range (Figure 1) 2
Ratio of Change in VREF to Change in VZ (VZ from VREF to 10V) ΔVREF/ΔVZ -1.85 -2.7 mV/V VZ from VREF to 10V, IZ = 10mA (Figure 2) 2
Ratio of Change in VREF to Change in VZ (VZ from 10V to 20V) ΔVREF/ΔVZ -1 -2 mV/V VZ from 10V to 20V, IZ = 10mA (Figure 2) 2
Reference Input Current IREF 0.12 1 µA R1 = 10k, R2 = O/C, IL = 10mA (Figure 2) 2
Deviation of Reference Input Current over Temperature ΔIREF 0.04 0.2 µA R1 = 10k, R2 = O/C, IL = 10mA, TA = Full Range (Figure 2) 2
Minimum Cathode Current for Regulation IZ(MIN) 35 50 µA VZ = VREF (Figure 1) 2
Off-State Current IZ(OFF) 0.1 µA VZ = 20V, VREF = 0V (Figure 3) 2
Dynamic Output Impedance RZ 0.75 Ω VZ = VREF (Figure 1), f = 0Hz 2
Maximum Temperature Coefficient (Features list) 72 ppm/°C 1

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin  Terminals: Finish, Matte Tin Plated Leads, Solderable per MIL-STD-202, Method 208  Weight: 10

CAD (KiCad official)

  • Symbol: ZR431FTA
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)
  • 3D model files: zr431fta-etched.step / zr431fta-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); zr431fta.step / zr431fta.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (11 pp, sha256 93e5c58d4c91bc6c, retrieved 2026-10-17, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF