# B5819WSQ

**Yangzhou Yangjie Elec Tech** · Schottky Barrier Diodes (SBD) · SOD-323(SC-90)

B5819WSQ from Yangzhou Yangjie Elec Tech, in a SOD-323(SC-90). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOD-323(SC-90) |
| Category | Diodes |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reverse Voltage | VR |  |  | 40 | V | B5819WSQ | 1 |
| Average Forward Current | IFAV |  |  | 1 | A |  | 1 |
| Peak Forward Surge Current | IFSM |  |  | 10 | A | 8.3ms, half sine | 1 |
| Power Dissipation | Ptot |  |  | 250 | mW |  | 1 |
| Thermal Resistance Junction to Ambient | RthJA |  |  | 400 | ℃/W |  | 1 |
| Junction Temperature | Tj | -55 |  | 125 | ℃ |  | 1 |
| Storage Temperature Range | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Reverse Breakdown Voltage | V(BR)R | 40 |  |  | V | IR=1mA | 2 |
| Forward Voltage | VF |  |  | 0.6 | V | IF=1A | 2 |
| Forward Voltage | VF |  |  | 0.9 | V | IF=3A | 2 |
| Reverse Leakage Current | IR |  |  | 40 | uA | VR=40V | 2 |
| Junction Capacitance | Cj |  |  | 120 | pF | VR=4V,f=1MHz | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `B5819WSQ`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323(SC-90) (KiCad packages3D, STEP)
- 3D model files: `b5819wsq-etched.step` / `b5819wsq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `b5819wsq.step` / `b5819wsq.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](docs/b5819wsq-datasheet.pdf) (5 pp, sha256 `cdc8bbb0439667f8`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/b5819wsq-datasheet.pdf)