# 1SMB5944BT3G-MS

**MSKSEMI** · Zener Diodes · SMB

1SMB5944BT3G-MS from MSKSEMI, in a SMB. 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 | K | passive | Cathode, marked by the polarity band; it is the positive terminal when the Zener is reverse biased in regulation (VZ 62 V nominal, 58.9 V to 65.1 V at IZT = 6 mA for the 5944B). |
| 2 | A | passive | Anode terminal; the Zener regulates when this pin is negative with respect to the cathode, and forward VF is 1.5 V max at IF = 200 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SMB |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `1SMB5944BT3G-MS`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `1smb5944bt3g-ms-etched.step` / `1smb5944bt3g-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1smb5944bt3g-ms.step` / `1smb5944bt3g-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603068777764974592) (8 pp, sha256 `d1db003dcf102a3c`, retrieved 2026-10-13, 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/1smb5944bt3g-ms-datasheet.pdf)