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CJ431D-P3A-ARG
Public Made by Adomby adom
Changjing Voltage Reference, SOT-89-3L. 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
markdownCJ431D-P3A-ARG
Changjing · Voltage Reference · SOT-89-3L
CJ431D-P3A-ARG from Changjing, in a SOT-89-3L. 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 (R) pin for adjustable output voltage; it must not be left floating, and VREF is 2.500 V typ. between Reference and Anode. |
| 2 | A | power_in | Anode pin, normally grounded; all voltages are referenced to it. |
| 3 | K | bidirectional | Cathode (K) shunt current / output voltage pin, with VKA from VREF to 36 V recommended (40 V absolute maximum) and IKA of 1 to 100 mA. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-89-3L |
| 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 voltage (0.4% grade) | VREF | 2.49 | 2.5 | 2.51 | V | VKA = VREF, IKA = 10mA; Figure 1 | 7 |
| Deviation of reference voltage over full temperature range, TA = 0 to 70°C | ΔVREF | 4.5 | 8 | mV | VKA = VREF, IKA = 10mA; Figure 1 | 7 | |
| Deviation of reference voltage over full temperature range, TA = -40 to 85°C | ΔVREF | 4.5 | 10 | mV | VKA = VREF, IKA = 10mA; Figure 1 | 7 | |
| Deviation of reference voltage over full temperature range, TA = -40 to 125°C | ΔVREF | 4.5 | 16 | mV | VKA = VREF, IKA = 10mA; Figure 1 | 7 | |
| Ratio of change in reference voltage to change in cathode voltage, ΔVKA = 10V to VREF | ΔVREF / ΔVKA | -1 | -2.7 | mV / V | IKA = 10mA; Figure 2 | 7 | |
| Ratio of change in reference voltage to change in cathode voltage, ΔVKA = 36 to 10V | ΔVREF / ΔVKA | -0.5 | -2 | mV / V | IKA = 10mA; Figure 2 | 7 | |
| Reference current | IREF | 0.7 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞; Figure 2 | 7 | |
| Deviation of reference current over full temperature range | ΔIREF | 0.4 | 1.2 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞, TA = -40 to 125°C; Figure 2 | 7 | |
| Minimum cathode current for regulation | IKA MIN | 0.4 | 1 | mA | VKA = VREF; Figure 1 | 7 | |
| Off-state cathode current | IKA OFF | 0.05 | 1 | µA | VKA = 36V, VREF = 0V; Figure 3 | 7 | |
| Dynamic impedance | ZKA | 0.15 | 0.5 | Ω | VKA = VREF, IKA = 1 to 100mA, f ≤ 1.0kHz; Figure 1 | 7 | |
| Reference voltage tolerance at 25°C | -0.4 | 0.4 | % | ±0.4% grade (suffix A), TA = 25°C | 1 | ||
| Cathode voltage (absolute maximum) | VKA | 40 | V | 6 | |||
| Cathode current range (continuous) | IKA | -100 | 150 | mA | Continuous | 6 | |
| Reference input current range | IREF | -0.05 | 10 | mA | 6 | ||
| Maximum junction temperature | TJ Max | 150 | °C | 6 | |||
| Storage temperature | Tstg | -65 | 150 | °C | 6 | ||
| Cathode voltage (recommended) | VKA | 36 | V | 6 | |||
| Cathode current (recommended) | IKA | 1 | 100 | mA | 6 | ||
| Operating ambient temperature | TA | -40 | 125 | °C | 6 | ||
| Junction-to-ambient thermal resistance (SOT-89-3L) | RΘJA | 208.3 | °C/W | Still air, TA = 25°C, 1 in2 FR-4 board, 2 oz copper | 7 | ||
| Junction-to-case thermal resistance (SOT-89-3L) | RΘJC | 56.5 | °C/W | 7 | |||
| Reference maximum power dissipation for continuous operation (SOT-89-3L) | PD Ref | 0.6 | W | Continuous operation; still air, TA = 25°C, 1 in2 FR-4 board, 2 oz copper | 7 |
CAD (KiCad official)
- Symbol:
CJ431D-P3A-ARG - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files:
cj431d-p3a-arg-etched.step/cj431d-p3a-arg-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cj431d-p3a-arg.step/cj431d-p3a-arg.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (24 pp, sha256
b75990ca44bd0e7d, retrieved 2026-10-17, 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).