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CJ431B

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

componentpower management (pmic)cj431bfactory-2.0.0extractor-text
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Contents

README

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CJ431B

Changjing · Voltage Reference · SOT-23

CJ431B from Changjing, 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 REFERENCE input Reference input of the adjustable shunt regulator, where Vref is approximately 2.5V and the reference input current is rated from 0.05 mA to 10 mA.
2 CATHODE passive Cathode terminal of the shunt regulator, rated for a cathode voltage of 40 V maximum and a continuous cathode current of -100 mA to +150 mA.
3 ANODE passive Anode terminal of the shunt regulator; the datasheet gives no pin-specific electrical limit for this terminal beyond the device ratings.

Key specifications

Parameter Value
Manufacturer Changjing
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 2.483 2.495 2.508 V VKA=VREF, IKA=10mA 2
Deviation of reference input voltage over temperature (note) ΔVref/ΔT 8 17 mV VKA=VREF, IKA=10mA; note TMIN=-25℃, TMAX=+125℃ 2
Ratio of change in reference input voltage to change in cathode voltage ΔVref/ΔVKA -1 -2.7 mV/V IKA=10mA; ΔVKA=10V~VREF 2
Ratio of change in reference input voltage to change in cathode voltage ΔVref/ΔVKA -0.4 -2 mV/V IKA=10mA; ΔVKA=36V~10V 2
Reference input current Iref 0.5 1.2 μA IKA=10mA, R1=10kΩ, R2=∞ 2
Deviation of reference input current over full temperature range ΔIref/ΔT 0.4 1.2 μA IKA=10mA, R1=10kΩ, R2=∞; full temperature range 2
Minimum cathode current for regulation IKA(min) 0.08 0.3 mA VKA=VREF 2
Off-state cathode current IKA(OFF) 0.01 0.8 μA VKA=36V, VREF=0 2
Dynamic impedance ZKA 0.1 0.37 Ω VKA=VREF, IKA=0.2 to 100mA, f≤1.0kHz 2
Temperature coefficient (features) 25 ppm/°C 1
Cathode Voltage VKA 40 V 1
Cathode Current Range (Continuous) IKA -100 150 mA Continuous 1
Reference Input Current Range Iref 0.05 10 mA 1
Power Dissipation PD 300 mW 1
Lead Temperature T 260 ℃ 1.6mm aside from the case, 10 seconds 1
Operating Ambient Temperature Range Tj -40 125 ℃ 1
Storage Temperature Range Tstg -65 150 ℃ 1
ESD (HBM) VESD 2.5 kV HBM 1
Thermal Resistance from Junction to Ambient RθJA 417 ℃/W 1

CAD (KiCad official)

  • Symbol: CJ431B
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)
  • 3D model files: cj431b-etched.step / cj431b-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cj431b.step / cj431b.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (7 pp, sha256 ee6071469d503f9f, retrieved 2026-10-09, 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