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KIA431A
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KIA Semicon Tech Voltage Reference, SOT-23. 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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README
markdownKIA431A
KIA Semicon Tech · Voltage Reference · SOT-23
KIA431A from KIA Semicon Tech, in a SOT-23. 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 | Ref | input | Reference input of the shunt regulator, set to the 2.5 V band-gap reference (VREF) that is compared against the external divider; reference input current range is -0.05 to +10 mA. |
| 2 | Cathode | passive | Cathode of the shunt regulator; recommended cathode current is 1 to 100 mA and cathode voltage is 0 to 36 V, with voltages referenced to the anode. |
| 3 | Anode | passive | Anode of the shunt regulator, which is the reference terminal for the cathode voltage ratings given in the datasheet. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | KIA Semicon Tech |
| Package | SOT-23 |
| 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 input voltage | VREF | 2.487 | 2.5 | 2.513 | V | IK=10mA, VKA=VREF (KIA431-A, note 1) | 3 |
| Reference drift | ΔVREF | 4 | 17 | mV | 0°C≤TA≤70°C, IK=10mA, VKA=VREF | 3 | |
| Voltage ratio, ref to cathode | ΔVREF/ΔVKA | -1.4 | -2.7 | mV/V | IK=10mA, VKA=2.5V to 10V | 3 | |
| Voltage ratio, ref to cathode | ΔVREF/ΔVKA | -1 | -2 | mV/V | IK=10mA, VKA=10V to 36V | 3 | |
| Reference input current | IREF | 2.3 | uA | IK=10mA, VKA=VREF | 3 | ||
| Reference input current | IREF | 2 | 4 | uA | 0°C≤TA≤70°C, IK=10mA, VKA=VREF | 3 | |
| Minimum operating current | IMIN | 0.4 | 1 | mA | VKA=VREF | 3 | |
| Off-state cathode current | IOFF | 0.1 | 1 | uA | VKA=36V, VREF=0V | 3 | |
| Dynamic impedance | ZKA | 0.2 | 0.5 | Ohm | VKA=VREF, IKA=1mA to 100mA, f≤1kHz | 3 | |
| Cathode voltage | VKA | 36 | V | Voltage values with respect to the anode terminal | 2 | ||
| Continuous cathode current | IK | -100 | 150 | mA | 2 | ||
| Reference input current range | IREF | -0.05 | 10 | mA | 2 | ||
| Power dissipation (SOT-23) | PD | 350 | mW | SOT-23 | 2 | ||
| Junction temperature | TJ | 0 | 150 | °C | 2 | ||
| Storage temperature | TSTG | -65 | 150 | °C | 2 | ||
| Operating free air temperature range | TA | 0 | 70 | °C | 2 | ||
| Cathode current | IK | 1 | 100 | mA | 2 | ||
| Cathode voltage | VKA | 0 | 36 | V | 2 |
CAD (KiCad official)
- Symbol:
KIA431A - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
kia431a-etched.step/kia431a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);kia431a.step/kia431a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: KIA Semicon Tech datasheet (4 pp, sha256
d27ded33af62a5a3, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).