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CD431A

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

componentpower managementcd431afactory-2.0.0extractor-text

Verified CD431A

by Ray · last 4 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

4 Nov 2026RayPublished by the parts factory: tier lcsc, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: CD431A · SOT-23 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 4-page datasheet
  • •distributor (warn): no ['digikey', 'mouser'] number
  • ✓family: SOT-23
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-1gyukm75/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ cd431a.kicad_sym✓ cd431a.kicad_mod✓ cd431a.step
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Contents

README

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CD431A

DOWO · Voltage References · SOT-23

CD431A from DOWO, 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 Cathode (K) passive Cathode is rated up to 37 V (absolute maximum VKA) with a continuous cathode current range of 1 to 100 mA under recommended operating conditions.
2 Reference (R) input Reference input sets the internal 2.495 V typical reference voltage (VREF), with reference input current IREF of 1.5 µA typical and 4 µA maximum.
3 Anode (A) passive Anode is the return path for cathode current; the minimum cathode current for regulation IKA(MIN) is 1 mA maximum, with a 1.0 mA minimum sink current capability stated in the features.

Key specifications

Parameter Value
Manufacturer DOWO
Package SOT-23
Category Power Management
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 (CD431A, 0.5%) VREF 2.483 2.495 2.507 V VKA=VREF, IKA=10mA; Fig1 2
Deviation of Reference Input Voltage Over Temperature ΔVREF 4.5 17 mV VKA=VREF, IKA=10mA, -25°C ≤TA≤+85°C; Fig1 2
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (10V to VREF) -1 -2.7 mV/V IKA=10mA, ΔVKA=10V~VREF; Fig2 2
Ratio of Change in Reference Input Voltage to Change in Cathode Voltage (36V to 10V) -0.5 -2 mV/V IKA=10mA, ΔVKA=36V~10V; Fig2 2
Reference Input Current IREF 1.5 4 µA IKA=10mA, R1=10KΩ, R2=∞; Fig2 2
Deviation of Reference Input Current Over Full Temperature Range ΔIREF 0.4 1.2 µA IKA=10mA, R1=10KΩ, R2=∞, -25°C ≤TA≤+85°C; Fig2 2
Minimum Cathode Current for Regulation IKA(MIN) 0.45 1 mA VKA=VREF; Fig1 2
Off-State Cathode Current IKA(OFF) 0.05 1 µA VKA=36V, VREF=0; Fig3 2
Dynamic Impedance ZKA 0.15 0.5 Ω VKA=VREF, IKA=1~100mA, f≤1.0KHz 2
Cathode Voltage VKA 37 V Ta=25℃ 1
Cathode Current Range (Continuous) IKA -100 150 mA Ta=25℃ 1
Reference Input Current Range IREF -0.05 10 mA Ta=25℃ 1
Maximum Power Dissipation PD 350 mW Ta=25℃ 1
Operating Junction Temperature TJ 150 °C Ta=25℃ 1
Storage Temperature Range TSTG -65 150 °C Ta=25℃ 1
Cathode Voltage (recommended) VKA 36 V 1
Cathode Current IKA 1 100 mA 1
Operating Ambient Temperature Range TOPR -25 85 °C 1

CAD (KiCad official)

  • Symbol: CD431A
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: cd431a-etched.step / cd431a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cd431a.step / cd431a.glb are the bare package body.

Provenance

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

  • Datasheet: DOWO datasheet (4 pp, sha256 b70c890b15a7ce63, retrieved 2026-11-04, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF