# SBDB4045TCTB

**Changjing** · Schottky Diodes · TO-263-2L

SBDB4045TCTB from Changjing, in a TO-263-2L. 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 | ANODE | passive | Anode terminal of the Schottky barrier rectifier, one of two anode pins (1 and 3) on the TO-263-2L package; the device is rated 45 V VRRM and 40 A average output current (2×20 A). |
| 2 | CATHODE | passive | Cathode terminal of the Schottky barrier rectifier, rated 45 V VRRM and 40 A average rectified output current (2×20 A) per the maximum ratings. |
| 3 | ANODE | passive | Anode terminal of the Schottky barrier rectifier, the second anode pin (with pin 1) on the TO-263-2L package; the device is rated 45 V VRRM and 40 A average output current (2×20 A). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-263-2L |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse voltage | V(BR) | 45 |  |  | V | IR=1mA | 1 |
| Peak repetitive reverse voltage | VRRM |  |  | 45 | V |  | 1 |
| RMS reverse voltage | VR(RMS) |  |  | 31.5 | V |  | 1 |
| Average rectified output current | IO |  |  | 40 | A |  | 1 |
| Non-Repetitive peak forward surge current | IFSM |  |  | 250 | A | 8.3ms half sine wave | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance from junction to ambient | RΘJA |  |  | 62.5 | ℃/W |  | 1 |
| Thermal resistance from junction to case | RΘJC |  |  | 2 | ℃/W | Tc=25℃ | 1 |

## CAD (KiCad official)

- Symbol: `SBDB4045TCTB`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263-2L (KiCad packages3D, STEP)
- 3D model files: `sbdb4045tctb-etched.step` / `sbdb4045tctb-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sbdb4045tctb.step` / `sbdb4045tctb.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589836169984188416) (3 pp, sha256 `6ee6bc14fc450820`, retrieved 2026-10-19, 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/sbdb4045tctb-datasheet.pdf)