# BAT54Q

**Yangzhou Yangjie Elec Tech** · Schottky Diodes · SOT-23

BAT54Q from Yangzhou Yangjie Elec Tech, in a SOT-23. 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 | A | passive | Anode of the single Schottky diode (BAT54Q), 30V VRRM, 200mA average forward current. |
| 2 | NC | unconnected | Not connected internally on the single-diode BAT54Q; no connection is drawn to this terminal in the pin diagram. |
| 3 | K | passive | Cathode of the single Schottky diode (BAT54Q), 30V VRRM, 200mA average forward current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Forward Voltage | VF |  |  | 0.24 | V | IF=0.1mA | 2 |
| Forward Voltage | VF |  |  | 0.32 | V | IF=1mA | 2 |
| Forward Voltage | VF |  |  | 0.4 | V | IF=10mA | 2 |
| Forward Voltage | VF |  |  | 0.5 | V | IF=30mA | 2 |
| Forward Voltage | VF |  |  | 1 | V | IF=100mA | 2 |
| Reverse Current | IR |  |  | 2 | μA | VR=25V | 2 |
| Breakdown Voltage | VBR | 35 |  |  | V | IR=10μA | 2 |
| Junction Capacitance | CJ |  |  | 10 | pF | VR=1V, f =1MHZ | 2 |
| Reverse Recovery Time | trr |  |  | 5 | ns | IF=IR=10mA,Irr=1mA,RL=100Ω | 2 |
| Repetitive Peak Reverse Voltage | VRRM |  |  | 30 | V |  | 1 |
| Average Forward Current | IFAV |  |  | 200 | mA |  | 1 |
| Peak Forward Surge Current | IFSM |  |  | 3 | A | square wave tp＜10ms | 1 |
| Power Dissipation | Ptot |  |  | 200 | mW |  | 1 |
| Junction Temperature | Tj | -55 |  | 125 | ℃ |  | 1 |
| Storage Temperature Range | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance Junction to Ambient | RthJA |  |  | 500 | ℃/W |  | 1 |

## 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 |
|---|---|---|---|---|
| housing |  | black | 4. Body color: Black | 4 |
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `BAT54Q`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bat54q-etched.step` / `bat54q-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bat54q.step` / `bat54q.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603581494099263488) (5 pp, sha256 `715b1a102ad486b5`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-5-5` (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/bat54q-datasheet.pdf)