BAT54S

@@ -0,0 +1,47 @@+# BAT54S++**Diodes Incorporated** · Schottky diode (series pair) · SOT-23++Two small Schottky diodes connected in series inside one SOT-23, with the shared cathode/anode node brought out on pin 3. The low forward drop (about 0.32 V) and fast recovery of a Schottky, in a tiny surface-mount package, make the BAT54S the default for signal steering and OR-ing two sources, level shifting, small-signal rectification, and clamping a node between two rails (tie the outer pins to the rails, the signal to the center). It blocks 30 V and handles 200 mA. The related BAT54 (single), BAT54A (common anode), and BAT54C (common cathode) cover the other configurations.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | A1 | passive | Anode of diode D1. Forward-biased current flows from pin 1 (A1) through D1 to pin 3 (K1/A2, the internal series node). |+| 2 | K2 | passive | Cathode of diode D2. Forward current from pin 3 (K1/A2 series node) exits through D2 to pin 2. |+| 3 | K1_A2 | passive | Series junction node: cathode of D1 connected internally to anode of D2. This is the shared middle pin of the BAT54S series-diode configuration. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Series dual Schottky diode |+| Configuration | 2 diodes in series (common node = pin 3) |+| Reverse voltage (VRRM) | 30 V |+| Forward current (IF) | 200 mA |+| Forward voltage (VF) | ~0.32 V at 10 mA |+| Recovery | fast (Schottky) |+| Pinout | 1=A1, 2=K2, 3=common (K1/A2) |+| Package | SOT-23 |++## Ordering variants++- `BAT54S-7-F (SOT-23)`+- `BAT54S (SOT-23, tape & reel)`++## CAD (KiCad official)++- Symbol: `Diode:BAT54S`+- Footprint: `Package_TO_SOT_SMD:SOT-23`+- 3D model: SOT-23 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/ds11005.pdf) (5 pp, sha256 `50b04e4e17bcf5db`, retrieved 2026-08-17, tier: manufacturer)+- **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/bat54s-datasheet.pdf)

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