# BAR43

**Changjing** · Schottky Barrier Diodes (SBD) · SOT-23

BAR43 from Changjing, 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 (BAR43, marking D95); 30 V peak repetitive reverse voltage, 200 mA average rectified forward current. |
| 2 | NC | unconnected | Not connected internally in the single-diode BAR43; the pin is drawn as an isolated terminal in the page 1 pin diagram. |
| 3 | K | passive | Cathode of the single Schottky diode (BAR43); reverse current 0.5 µA max at VR=25 V, V(BR) 30 V min at IR=100 µA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse breakdown voltage | V(BR) | 30 |  |  | V | IR=100μA | 1 |
| Reverse current | IR |  |  | 0.5 | μA | VR=25V | 1 |
| Forward voltage | VF |  | 0.26 | 0.33 | V | IF=2mA | 1 |
| Forward voltage | VF |  |  | 0.45 | V | IF=15mA | 1 |
| Forward voltage | VF |  |  | 0.8 | V | IF=100mA | 1 |
| Reverse recovery time | trr |  |  | 5 | ns | IF= IR=10mA, Irr=0.1×IR, RL=100Ω | 1 |
| Peak Repetitive Reverse Voltage | VRRM |  |  | 30 | V |  | 1 |
| Working Peak Reverse Voltage | VRWM |  |  | 30 | V |  | 1 |
| RMS Reverse Voltage | VR(RMS) |  |  | 21 | V |  | 1 |
| Average Rectified Forward Current | IF(AV) |  |  | 200 | mA |  | 1 |
| Non-repetitive Peak Forward Surge Current | IFSM |  |  | 0.75 | A | t=8.3ms | 1 |
| Power Dissipation | PD |  |  | 200 | mW |  | 1 |
| Thermal Resistance from Junction to Ambient | RΘJA |  |  | 500 | ℃/W |  | 1 |
| Junction Temperature | Tj |  |  | 125 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `BAR43`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bar43-etched.step` / `bar43-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bar43.step` / `bar43.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/bar43-datasheet.pdf) (4 pp, sha256 `48d4e9273a4b5eac`, retrieved 2026-11-12, 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/bar43-datasheet.pdf)