# BAS40-05T

**Changjing** · Schottky Barrier Diodes (SBD) · SOT-523

BAS40-05T from Changjing, 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 | A1 | passive | Anode of first Schottky diode (40 V VRRM, 200 mA continuous forward current), pin 1 of the SOT-523 package. |
| 2 | A2 | passive | Anode of second Schottky diode (40 V VRRM, 200 mA continuous forward current), pin 2 of the SOT-523 package. |
| 3 | K | passive | Common cathode of both Schottky diodes (BAS40-05T, marking 45), pin 3 of the SOT-523 package. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Breakdown Voltage | V (BR) | 40 |  |  | V | IR=10μA | 1 |
| Forward Voltage | VF1 |  |  | 0.38 | V | IF=1mA | 1 |
| Forward Voltage | VF2 |  |  | 1 | V | IF=40mA | 1 |
| Reverse Current | IR |  |  | 0.2 | μA | VR=30V | 1 |
| Diode Capacitance | CD |  |  | 5 | pF | VR=0,f=1MHz | 1 |
| Reverse Recovery Time | trr |  |  | 5 | ns | IF=IR=10mA, Irr=0.1XIR, RL=100Ω | 1 |
| Peak Repetitive Peak Reverse Voltage | VRRM |  |  | 40 | V |  | 1 |
| Working Peak Reverse Voltage | VRWM |  |  | 40 | V |  | 1 |
| DC Blocking Voltage | VR |  |  | 40 | V |  | 1 |
| Forward Continuous Current | IFM |  |  | 200 | mA |  | 1 |
| Average Rectified Output Current | IO |  |  | 200 | mA |  | 1 |
| Non-Repetitive Peak Forward Surge Current | IFSM |  |  | 0.6 | A | t = 8.3ms | 1 |
| Power Dissipation | PD |  |  | 150 | mW |  | 1 |
| Thermal Resistance Junction to Ambient | RθJA |  |  | 667 | ℃/W |  | 1 |
| Operating Junction Temperature | TJ |  |  | 125 | ℃ |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `BAS40-05T`
- 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: `bas40-05t-etched.step` / `bas40-05t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bas40-05t.step` / `bas40-05t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/bas40-05t-datasheet.pdf) (4 pp, sha256 `f5a8c7e012bc6ff5`, retrieved 2026-11-04, 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/bas40-05t-datasheet.pdf)