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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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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
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docs bat54s: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers cross-highlight symbol + footprint viewers · Ray 2mo ago
bat54s-etched.fit.json bat54s: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
bat54s-etched.glb bat54s: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
bat54s-etched.step bat54s: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
BAT54S.adom-lbr.json BAT54S: validated Fusion/EAGLE library + adom-lbr hub, generated from this page's KiCad sources · Ray 2mo ago
bat54s.glb Publish 0.1.0 · Ray 2mo ago
bat54s.kicad_mod Publish 0.1.0 · Ray 2mo ago
bat54s.kicad_sym Publish 0.1.0 · Ray 2mo ago
bat54s.lbr add validated EAGLE .lbr (Fusion library) · Ray 2mo ago
BAT54S.lbr BAT54S: validated Fusion/EAGLE library + adom-lbr hub, generated from this page's KiCad sources · Ray 2mo ago
bat54s.step add .step (Fusion 3D source) · Ray 2mo ago
package.json Publish 0.1.0 · Ray 2mo ago
page.json bat54s: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding) · Ray 28d ago
README.md bat54s: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 1mo ago

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)
  • 3D model files: bat54s-etched.step / bat54s-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bat54s.step / bat54s.glb are 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).

Datasheet PDF