# LMSZ5227BT1G

**LRC** · Zener Diodes · SOD-123

LMSZ5227BT1G from LRC, in a SOD-123. 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 | Zener cathode terminal, identified on the package by the polarity band (datasheet lists pin 1 as Cathode). |
| 2 | Anode | passive | Zener anode terminal, the terminal opposite the cathode polarity band (datasheet lists pin 2 as Anode). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOD-123 |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage @ IZT (LMSZ5227BT1G, nominal 3.6 V) | VZ | 3.42 | 3.6 | 3.78 | V | IZT = 20 mA | 3 |
| Maximum Zener Impedance @ IZT | ZZT |  |  | 24 |  | IZT = 20 mA | 3 |
| Maximum Zener Impedance @ IZK | ZZK |  |  | 1700 |  | IZK = 0.25 mA | 3 |
| Forward Voltage | VF |  |  | 0.9 | V | IF = 10 mA | 3 |
| Total Power Dissipation on FR-5 Board | PD |  |  | 500 | mW | FR-5 board (Note 1), TL = 75°C | 1 |
| Thermal Resistance, Junction-to-Ambient | RJA |  |  | 340 | °C/W | Note 2 (infrared scan method) | 1 |
| Thermal Resistance, Junction-to-Lead | RJL |  |  | 150 | °C/W | Note 2 (infrared scan method) | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `LMSZ5227BT1G`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `lmsz5227bt1g-etched.step` / `lmsz5227bt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lmsz5227bt1g.step` / `lmsz5227bt1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LRC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586186987422289920) (6 pp, sha256 `9dcd48ce1826b714`, retrieved 2026-10-18, 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/lmsz5227bt1g-datasheet.pdf)