# 1N4148WS-E

**MDD Microdiode Semiconductor** · Switching Diodes · SOD-323

1N4148WS-E from MDD Microdiode Semiconductor, in a SOD-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 | CATHODE | passive | Cathode terminal, marked by the cathode bar on the SOD-323 case; the diode is rated for a maximum repetitive peak reverse voltage of 100 V. |
| 2 | A | passive | Anode terminal; the device is rated for 0.15 A forward continuous current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MDD Microdiode Semiconductor |
| Package | SOD-323 |
| Category | Diodes |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Maximum repetitive peak reverse voltage | VRRM |  |  | 100 | V |  | 1 |
| Maximum RMS voltage | VRMS |  |  | 75 | V |  | 1 |
| Forward continuous current | IFM |  |  | 300 | mA |  | 1 |
| Average rectified output current | IO |  |  | 150 | mA |  | 1 |
| Peak forward current | IFSM |  |  | 0.5 | A | at 1s | 1 |
| Peak forward current | IFSM |  |  | 1 | A | at 1ms | 1 |
| Peak forward current | IFSM |  |  | 4 | A | at 1us | 1 |
| Power dissipation | Pd |  |  | 400 | mW |  | 1 |
| Thermal resistance junction to ambient | RΘJA |  | 250 |  | °C/W |  | 1 |
| Junction temperature | Tj | -55 |  | 125 | °C |  | 1 |
| Storage temperature | TSTG | -55 |  | 150 | °C |  | 1 |
| Forward voltage | VF1 |  |  | 0.715 | V | IF=1.0mA | 1 |
| Forward voltage | VF2 |  |  | 0.855 | V | IF=10mA | 1 |
| Forward voltage | VF3 |  |  | 1 | V | IF=50mA | 1 |
| Forward voltage | VF4 |  |  | 1.25 | V | IF=150mA | 1 |
| Reverse current | IR1 |  |  | 0.025 | uA | VR=20V, Tj=25°C | 1 |
| Reverse current | IR2 |  |  | 1 | uA | VR=75V, Tj=25°C | 1 |
| Reverse current | IR3 |  |  | 30 | uA | VR=25V, Tj=150°C | 1 |
| Reverse current | IR4 |  |  | 50 | uA | VR=75V, Tj=150°C | 1 |
| Capacitance between terminals | CT |  |  | 2 | pF | VR=0V, f=1.0MHz | 1 |
| Reverse recovery time | trr |  |  | 4 | ns | IF=IR=10mA, Irr=0.1XIR, RL=100 | 1 |

## CAD (KiCad official)

- Symbol: `1N4148WS-E`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `1n4148ws-e-etched.step` / `1n4148ws-e-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1n4148ws-e.step` / `1n4148ws-e.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MDD Microdiode Semiconductor datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604432959844077568) (3 pp, sha256 `0e7a780941daf716`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/1n4148ws-e-datasheet.pdf)