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RS421AYSF3

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

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RS421AYSF3

Jiangsu RUNIC Tech · Voltage Reference · SOT-23

RS421AYSF3 from Jiangsu RUNIC 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 Cathode passive Shunt current/voltage input; the datasheet recommends a continuous cathode current of 0.5 mA to 100 mA and a cathode voltage from VREF to 36 V.
2 Ref input Threshold input referenced to the common anode; the output is set with two external resistors to any value between VREF (about 1.18 V) and 36 V.
3 Anode power_in Common pin, normally connected to ground; all voltages are referenced to the GND pin.

Key specifications

Parameter Value
Manufacturer Jiangsu RUNIC 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 output voltage (initial tolerance at 25°C) -0.5 0.5 % TA=25°C 1
Reference Output Voltage VREF 1.174 1.18 1.186 V VKA=VREF, IKA=10mA 6
Deviation of reference input voltage over temperature ΔVREF 10 20 mV VKA=VREF, IKA=10mA, TA= -40°C ~ +125°C 6
Ratio of change in reference input voltage to change in cathode voltage ΔVREF/ΔVKA -0.08 -0.2 mV/V IKA=10mA, ΔVKA=10V~VREF 6
Ratio of change in reference input voltage to change in cathode voltage ΔVREF/ΔVKA -0.06 -0.2 mV/V IKA=10mA, ΔVKA=36V~10V 6
Reference input current IREF 0.4 1.2 uA IKA=10mA, R1=10kΩ, R2=∞ 6
Deviation of reference input current over full temperature range ΔIREF 0.3 1.2 uA IKA=10mA, R1=10kΩ, R2=∞, TA= -40°C ~ +125°C 6
Minimum cathode current for regulation IKA (min) 0.17 0.3 mA VKA=VREF, TA= 25°C 6
Off-state cathode current IKA (OFF) 5 10 uA VKA=36V, VREF=0V, TA= 25°C 6
Off-state cathode current IKA (OFF) 0.03 0.1 uA VKA=18V, VREF=0V, TA= 25°C 6
Dynamic impedance ZKA 0.1 0.4 Ω VKA=VREF, IKA=1mA to 100mA, f≤1.0KHz 6
Cathode voltage (recommended operating) VKA 36 V 5
Cathode current range (continuous, recommended operating) IKA 0.5 100 mA 5
Operating ambient temperature range TA -40 125 °C 5
Cathode voltage (absolute maximum) VKA -0.3 37 V 5
Cathode current range (continuous, absolute maximum) IKA -100 155 mA 5
Reference input current range (absolute maximum) IREF -0.05 10 mA 5
Operating junction temperature Topr -40 150 °C 5
Power dissipation PD 370 mW 5
Storage temperature Tstg -55 150 °C 5
Electrostatic discharge, human-body model (HBM) V(ESD) -4000 4000 V 5
Electrostatic discharge, charge device model (CDM) V(ESD) -200 200 V 5
Junction-to-ambient thermal resistance RθJA 185.6 °C/W SOT23 3-pin 5
Junction-to-case (top) thermal resistance RθJC (top) 104.3 °C/W SOT23 3-pin 5
Junction-to-board thermal resistance RθJB 54.5 °C/W SOT23 3-pin 5
Junction-to-top characterization parameter ψJT 31 °C/W SOT23 3-pin 5
Junction-to-board characterization parameter ψJB 54.5 °C/W SOT23 3-pin 5

CAD (KiCad official)

  • Symbol: RS421AYSF3
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: rs421aysf3-etched.step / rs421aysf3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); rs421aysf3.step / rs421aysf3.glb are the bare package body.

Provenance

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

  • Datasheet: Jiangsu RUNIC Tech datasheet (11 pp, sha256 5330799985f35142, retrieved 2026-10-18, 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