# BAS70W-04

**Changjing** · Schottky Diodes · SOT-323

BAS70W-04 from Changjing, in a SOT-323. 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 the first Schottky diode in the series pair (BAS70W-04, marking K74); 70 V DC reverse voltage, 70 mA forward continuous current. |
| 2 | K2 | passive | Cathode of the second Schottky diode in the series pair (BAS70W-04, marking K74); 70 V DC reverse voltage, 70 mA forward continuous current. |
| 3 | K1/A2 | passive | Common node joining the cathode of the first diode and the anode of the second diode (series configuration, BAS70W-04); 70 V DC reverse voltage, 70 mA forward continuous current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| Forward voltage | VF |  |  | 410 | mV | IF=1mA | 1 |
| Forward voltage | VF |  |  | 1000 | mV | IF=15mA | 1 |
| Reverse voltage leakage current | IR |  |  | 100 | nA | VR=50V | 1 |
| Diode capacitance | CD |  |  | 2 | pF | VR=0V,f=1MHz | 1 |
| Reverse recovery time | trr |  |  | 5 | ns | IF=IR=10mA, Irr=0.1xIR, RL=100Ω | 1 |
| Reverse breakdown voltage | V(BR) | 70 |  |  | V | IR=10µA | 1 |
| DC Voltage (reverse) | VR |  |  | 70 | V |  | 1 |
| Forward Continuous Current | IF |  |  | 70 | mA |  | 1 |
| Non-Repetitive Peak Forward Surge Current | IFSM |  |  | 100 | mA | t = 8.3ms | 1 |
| Power Dissipation | PD |  |  | 200 | mW |  | 1 |
| Junction Temperature | TJ |  |  | 125 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 500 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BAS70W-04`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `bas70w-04-etched.step` / `bas70w-04-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bas70w-04.step` / `bas70w-04.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/8590907323831431168) (4 pp, sha256 `d7767cbab9cdc930`, 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/bas70w-04-datasheet.pdf)