# BAV199Q

**Yangzhou Yangjie Elec Tech** · Switching Diodes · SOT-23

BAV199Q from Yangzhou Yangjie Elec Tech, 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 | A1 | passive | Anode of the first diode, which is in series with the second diode; the diagram shows its cathode joined to pin 3. |
| 2 | K2 | passive | Cathode of the second diode, which is in series with the first diode; the diagram shows its anode joined to pin 3. |
| 3 | K1/A2 | passive | Common node joining the cathode of the first diode to the anode of the second diode in the series pair; each diode is rated 85 V VBR and 215 mA IFAV. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| 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 | VBR | 85 |  |  | V | IR= 100μA | 1 |
| Forward Voltage | VF |  |  | 900 | mV | IF= 1mA | 1 |
| Forward Voltage | VF |  |  | 1000 | mV | IF= 10mA | 1 |
| Forward Voltage | VF |  |  | 1100 | mV | IF= 50mA | 1 |
| Forward Voltage | VF |  |  | 1250 | mV | IF= 150mA | 1 |
| Reverse Current | IR |  |  | 5 | nA | VR= 75V | 1 |
| Junction Capacitance | Cj |  |  | 4 | pF | VR= 0V, f= 1MHz | 1 |
| Reverse Recovery Time | trr |  |  | 3 | μs | IF= IR= 10mA, Irr= 0.1IR, RL= 100Ω | 1 |
| Reverse Breakdown Voltage | VBR |  |  | 85 | V |  | 1 |
| Average Forward Current | IFAV |  |  | 215 | mA | Single diode loaded | 1 |
| Non-Repetitive Peak Forward Surge Current | IFSM |  |  | 4 | A | tp=1 us | 1 |
| Power Dissipation | PD |  |  | 350 | mW |  | 1 |
| Maximum Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature Range | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance Junction to Ambient | RthJA |  |  | 357 | ℃/W |  | 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 |
|---|---|---|---|---|
| housing |  | black | 4. Body color: Black | 3 |
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `BAV199Q`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bav199q-etched.step` / `bav199q-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bav199q.step` / `bav199q.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603581495009562624) (4 pp, sha256 `c88d05bd3f00912b`, 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/bav199q-datasheet.pdf)