component
ZR431FTA
Public Made by Adomby adom
Diodes Incorporated Voltage Reference, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownZR431FTA
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);zr431fta.step/zr431fta.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).