# 1SMB5939_R1_10001

**PANJIT International** · Zener Diodes · SMB

1SMB5939_R1_10001 from PANJIT International, 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PANJIT International |
| Package | SMB |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener Voltage (Nominal Vz row, min/typ/max) | VZ | 37.05 | 39 | 40.95 | V | @ IZT = 9.6 mA | 2 |
| Maximum Zener Impedance (ZZT) | ZZT |  |  | 45 | Ω | @ IZT = 9.6 mA | 2 |
| Maximum Zener Impedance (ZZK) | ZZK |  |  | 900 | Ω | @ IZK = 0.25 mA | 2 |
| Max. Reverse Leakage Current | IR |  |  | 1 | μA | VR = 29.7 V | 2 |
| Peak Pulse Power Dissipation on TL=75OC (Notes A) / Derate above 75OC | PD |  |  | 1.5 | Watts | Notes A; derate above 75OC | 1 |
| Peak Forward Surge Current | IFSM |  |  | 10 | Amps | 8.3ms single half sine-wave superimposed on rated load | 1 |
| Operating Junction and Storage Temperature Range | TJ,TSTG | -55 |  | 150 | OC |  | 1 |

## CAD (KiCad official)

- Symbol: `1SMB5939_R1_10001`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB (KiCad packages3D, STEP)
- 3D model files: `1smb5939-r1-10001-etched.step` / `1smb5939-r1-10001-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1smb5939-r1-10001.step` / `1smb5939-r1-10001.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PANJIT International datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590196922494582784) (7 pp, sha256 `6bd9fecfb369858a`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/1smb5939-r1-10001-datasheet.pdf)