BR431M

@@ -0,0 +1,42 @@+# BR431M++**Foshan Blue Rocket Elec** · Voltage Reference · SOT-23++BR431M from Foshan Blue Rocket Elec, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | R | input | Reference input. The internal error amplifier compares this pin against the 2.500V internal reference; typically driven from a resistor divider between cathode and anode to set the regulated cathode voltage (VKA = (1 + R1/R2)·Vref). IREF ~1 μA typical. |+| 2 | K | passive | Cathode. Shunt terminal that sinks the regulated current (1 mA to 100 mA operating, 100 mA absolute max). Supports VKA up to 37 V; when VREF exceeds 2.5 V the cathode conducts, clamping VKA. |+| 3 | A | passive | Anode. Return terminal for cathode sink current and reference; typically tied to circuit ground/common in shunt-regulator configurations. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Foshan Blue Rocket Elec |+| Package | SOT-23 |+| Category | PMIC |+| Pins | 3 |++## Ordering variants++- `BR431MM`++## CAD (KiCad official)++- Symbol: `BR431M`+- 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:** [Foshan Blue Rocket Elec datasheet](docs/br431m-datasheet.pdf) (7 pp, sha256 `ac51a1796cf0b933`, 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/br431m-datasheet.pdf)

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