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NCP431ACSNT1G

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

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NCP431ACSNT1G

onsemi · Voltage Reference · SOT-23-3

NCP431ACSNT1G from onsemi, 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 Reference passive Reference input of the programmable shunt regulator, held at Vref of 2.5 V nominal, with Iref of 81 nA typical and 190 nA maximum at IK = 1 mA.
2 Cathode passive Cathode of the shunt regulator, which can be programmed up to 36 V (VKA recommended maximum 36 V, absolute maximum 37 V) with cathode current from 0.04 mA to 100 mA.
3 Anode passive Anode of the shunt regulator, serving as the common terminal for the cathode-to-anode voltage, with cathode current range of −100 mA to +150 mA continuous.

Key specifications

Parameter Value
Manufacturer onsemi
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 Input Voltage (TA = 25°C) Vref 2.475 2.5 2.525 V VKA = Vref, IK = 1 mA, TA = 25°C 3
Reference Input Voltage (over temperature) Vref 2.475 2.5 2.525 V VKA = Vref, IK = 1 mA, TA = Tlow to Thigh 3
Ratio of change in reference input voltage to cathode-anode voltage (VKA = 10 V to Vref) Vref/VKA -1.85 -3.1 mV/V IK = 1 mA, VKA = 10 V to Vref 3
Ratio of change in reference input voltage to cathode-anode voltage (VKA = 36 V to 10 V) Vref/VKA -0.8 -1.8 mV/V IK = 1 mA, VKA = 36 V to 10 V 3
Reference Input Current Iref 81 190 nA IK = 1 mA, R1 = 220 k, TA = −40°C to +125°C 3
Reference Input Current Deviation Over Temperature Range IrefT 22 55 nA IK = 1 mA, R1 = 10 k 3
Minimum Cathode Current For Regulation Imin 40 60 µA VKA = Vref 3
Off-State Cathode Current Ioff 180 1000 nA VKA = 36 V, Vref = 0 V 3
Dynamic Impedance /ZKA/ 0.22 0.5 Ω VKA = Vref, IK = 1.0 mA to 100 mA, f 1.0 kHz 3
Cathode To Anode Voltage (recommended) VKA 36 V Minimum printed as the symbol Vref, not a number 2
Cathode Current (recommended) IK 0.04 100 mA 2
Cathode to Anode Voltage (absolute maximum) VKA 37 V 2
Cathode Current Range, Continuous IK -100 150 mA Continuous 2
Reference Input Current Range, Continuous Iref -5 10 mA Continuous 2
Operating Junction Temperature TJ 150 °C 2
Operating Ambient Temperature Range TA -40 125 °C 2
Storage Temperature Range Tstg -65 150 °C 2
Total Power Dissipation (SN suffix) PD 0.52 W TA = 25°C, SN1 suffix plastic package; derate above 25°C ambient 2
ESD Human Body Model HBM 2000 V Human Body Model per JEDEC JESD22-A114F (printed as >2000) 2
ESD Charged Device Model CDM 1000 V Charged Device Model per JEDEC JESD22-C101E (printed as >1000) 2
Thermal Resistance, Junction-to-Ambient (SN suffix, 10 mm2 x 35 µm Cu) RJA 255 °C/W SN suffix package, 10 mm2 x 35 µm Cu 2
Thermal Resistance, Junction-to-Lead (Lead 3, SN suffix) RJL 80 °C/W Lead 3, SN suffix package, 10 mm2 x 35 µm Cu 2

CAD (KiCad official)

  • Symbol: NCP431ACSNT1G
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3 (KiCad packages3D, STEP)
  • 3D model files: ncp431acsnt1g-etched.step / ncp431acsnt1g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ncp431acsnt1g.step / ncp431acsnt1g.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (17 pp, sha256 eebf6db420b91340, retrieved 2026-10-19, 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