# 1SS344

**Changjing** · Schottky Diodes · SOT-23

1SS344 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 Schottky barrier diode, shown connected through the diode symbol to pin 3 (20 V DC blocking voltage, 500 mA continuous forward current). |
| 2 | NC | unconnected | Not connected internally; shown as an open terminal with no connection to the diode in the package schematic. |
| 3 | K | passive | Cathode of the Schottky barrier diode, shown on the bar side of the diode symbol (20 V DC blocking voltage, 1.5 A peak forward current). |

## 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 |
|---|---|---|---|---|---|---|---|
| DC Blocking Voltage | VR |  |  | 20 | V |  | 1 |
| Forward Continuous Current | IO |  |  | 500 | mA |  | 1 |
| Peak Forward Current | IFM |  |  | 1.5 | A |  | 1 |
| Non-repetitive Peak Forward Surge Current | IFSM |  |  | 5 | A | 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 |
| Reverse voltage | V(BR) | 20 |  |  | V | IR=100μA | 1 |
| Reverse current | IR |  |  | 20 | μA | VR=10V | 1 |
| Reverse current | IR |  |  | 100 | μA | VR=20V | 1 |
| Forward voltage | VF |  |  | 0.35 | V | IF=10mA | 1 |
| Forward voltage | VF |  |  | 0.43 | V | IF=100mA | 1 |
| Forward voltage | VF |  |  | 0.55 | V | IF=500mA | 1 |
| Total capacitance | Ctot |  |  | 120 | pF | VR=0V, f=1MHz | 1 |
| Reverse recovery time | trr |  |  | 20 | ns | IF= IR=50mA, VR=6V | 1 |

## CAD (KiCad official)

- Symbol: `1SS344`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `1ss344-etched.step` / `1ss344-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1ss344.step` / `1ss344.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/8590224186766487552) (4 pp, sha256 `33c2179612e5cb7b`, retrieved 2026-10-17, 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/1ss344-datasheet.pdf)