# BAT54T

**Tak Cheong** · Schottky Diodes · SOT-523

BAT54T from Tak Cheong, in a SOT-523. 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 (BAT54T, marking L1); reverse voltage 30 V max and average rectified output current 200 mA. |
| 2 | NC | unconnected | Not connected internally in BAT54T; the symbol shows no diode on pin 2 (pin 2 is used only in the BAT54ST dual version). |
| 3 | K | passive | Cathode of the single Schottky diode (BAT54T, marking L1); reverse voltage 30 V max and average rectified output current 200 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Tak Cheong |
| Package | SOT-523 |
| 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 |
|---|---|---|---|---|---|---|---|
| Power Dissipation | PD |  |  | 150 | mW |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 125 | °C |  | 1 |
| Operating Junction Temperature | TJ |  |  | 125 | °C |  | 1 |
| Reverse Voltage | VR |  |  | 30 | V |  | 1 |
| Average Rectified Output Current | IFO |  |  | 200 | mA |  | 1 |
| Reverse Breakdown Voltage | V(BR) | 30 |  |  | Volts | IR=100µA | 1 |
| Reverse Leakage Current | IR |  |  | 2 | µA | VR=25V | 1 |
| Forward Voltage | VF |  |  | 0.24 | Volts | IF=0.1mA | 1 |
| Forward Voltage | VF |  |  | 0.32 | Volts | IF=1mA | 1 |
| Forward Voltage | VF |  |  | 0.4 | Volts | IF=10mA | 1 |
| Forward Voltage | VF |  |  | 0.5 | Volts | IF=30mA | 1 |
| Forward Voltage | VF |  |  | 1 | Volts | IF=100mA | 1 |
| Total Capacitance | CT |  |  | 10 | pF | VR=1V, f=1MHz | 1 |
| Reverse Recovery Time | Trr |  |  | 5 | nS | IF= IR= 10mA, IRR=0.1x IR, RL=100Ω | 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 |
|---|---|---|---|---|
| contacts |  | tin | ƒ Matte Tin(Sn) Lead Finish Electrical Symbol & Marking Codes: | 1 |

## CAD (KiCad official)

- Symbol: `BAT54T`
- Footprint: `Package_TO_SOT_SMD:SOT-523`
- 3D model: SOT-523, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.8 mm nominal SOT-523 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `bat54t-etched.step` / `bat54t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bat54t.step` / `bat54t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Tak Cheong datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590227017045483520) (4 pp, sha256 `60049cca62a18db3`, 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/bat54t-datasheet.pdf)