# UBT26A05L03

**Brightking** · ESD And Surge Protection (TVS/ESD) · SOT-23-6L

UBT26A05L03 from Brightking, in a SOT-23-6L. 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 | I/O1 | bidirectional | ESD-protected data line with 5 V working voltage (reverse stand-off VRWM 5.25 V max), 1 µA max reverse leakage at 5.25 V, and IEC61000-4-2 protection rated ±8 kV contact / ±15 kV air. |
| 2 | GND | power_in | Ground reference for the protection clamp; off-state junction capacitance of 3.5 pF max is specified between the I/O pins and GND. |
| 3 | I/O2 | bidirectional | ESD-protected data line with 5 V working voltage (reverse stand-off VRWM 5.25 V max), 1 µA max reverse leakage at 5.25 V, and IEC61000-4-2 protection rated ±8 kV contact / ±15 kV air. |
| 4 | I/O2 | bidirectional | ESD-protected data line with 5 V working voltage (reverse stand-off VRWM 5.25 V max), 1 µA max reverse leakage at 5.25 V, and IEC61000-4-2 protection rated ±8 kV contact / ±15 kV air. |
| 5 | VBUS | power_in | Pin labelled VBUS in the pin configuration; the datasheet gives no separate electrical limit or function for it beyond the USB application diagram on page 3. |
| 6 | I/O1 | bidirectional | ESD-protected data line with 5 V working voltage (reverse stand-off VRWM 5.25 V max), 1 µA max reverse leakage at 5.25 V, and IEC61000-4-2 protection rated ±8 kV contact / ±15 kV air. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Brightking |
| Package | SOT-23-6L |
| Category | Circuit Protection |
| Pins | 6 |

## 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 stand-off voltage | VRWM |  |  | 5.25 | V |  | 2 |
| Reverse breakdown voltage | VBR | 6 |  |  | V | IBR=1mA | 2 |
| Reverse leakage current | IR |  |  | 1 | μA | VR=5.25V; each I/O pin | 2 |
| Clamping voltage (tp=8/20μs) | VC |  |  | 12 | V | tp=8/20μs, IPP=1A | 2 |
| Clamping voltage (tp=8/20μs) | VC |  |  | 17 | V | tp=8/20μs, IPP=5A | 2 |
| Off state junction capacitance | CJ |  | 3.5 |  | pF | 0Vdc, f=1MHz, between I/O pins and GND | 2 |
| Peak pulse current (tp=8/20μs) | IPP |  |  | 5 | A | tp=8/20μs | 1 |
| ESD voltage (Contact discharge) | VESD | -8 |  | 8 | kV | Contact discharge; printed ±8 kV | 1 |
| ESD voltage (Air discharge) | VESD | -15 |  | 15 | kV | Air discharge; printed ±15 kV | 1 |
| Storage & operating temperature range | TSTG, TJ | -55 |  | 150 | ℃ |  | 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 | ● Lead Free/RoHS compliant ● Solder reflow temperature: Pure Tin-Sn, 260~270℃ | 1 |

## CAD (KiCad official)

- Symbol: `UBT26A05L03`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6L (KiCad packages3D, STEP)
- 3D model files: `ubt26a05l03-etched.step` / `ubt26a05l03-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ubt26a05l03.step` / `ubt26a05l03.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Brightking datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590165245055565825) (5 pp, sha256 `896c929fba8cf7d0`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/ubt26a05l03-datasheet.pdf)