CJ431

@@ -0,0 +1,46 @@+# CJ431++**Jiangsu Changjing Electronics Technology Co   Ltd** · Voltage Reference · SOT-23++CJ431 from Jiangsu Changjing Electronics Technology Co   Ltd, in a SOT-23. Pinout and pin descriptions extracted from the datasheet (via LCSC) by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | REF | input | Reference input. Compared internally against the 2.5 V (typ.) bandgap reference; when REF exceeds Vref the device sinks current from cathode to anode. Reference input current is 1.5 µA typ. (4 µA max) with a 10 kΩ divider at IKA=10 mA. |+| 2 | A | power_in | Anode. Common/ground terminal of the shunt regulator; the low side of the programmable zener. Typically tied to circuit ground in shunt-regulator applications. |+| 3 | K | power_in | Cathode. High side of the programmable shunt; sinks the regulated current when the reference threshold is exceeded. Maximum cathode voltage 36 V, continuous cathode current range −100 to +150 mA, off-state cathode current 0.05 µA typ. (1 µA max) at VKA=36 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Jiangsu Changjing Electronics Technology Co   Ltd |+| Package | SOT-23 |+| Category | PMIC |+| Pins | 3 |++## Ordering variants++- `CJ431 (marking '431')`+- `CJ431CD431 (marking 'CD431')`+- `CJ431 (SOT-89 reel, marking 'CJ431')`+- `CJ431 (bulk)`+- `CJ431-TA (tape)`++## CAD (KiCad official)++- Symbol: `CJ431`+- Footprint: `Package_TO_SOT_SMD:SOT-23`+- 3D model: SOT-23 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Jiangsu Changjing Electronics Technology Co   Ltd datasheet](https://datasheet.lcsc.com/datasheet/pdf/dca1b312f3e4467c9202db2f691d7926.pdf) (9 pp, sha256 `68a405075950c4b5`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/cj431-datasheet.pdf)

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