BAT54S
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Diodes Inc series dual Schottky, SOT-23. 30 V, 200 mA, low VF. Two diodes sharing a common node. Datasheet-verified.
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markdownBAT54S
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)
- 3D model files:
bat54s-etched.step/bat54s-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);bat54s.step/bat54s.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (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).