# LM-SM712

**Leiditech** · ESD And Surge Protection (TVS/ESD) · SOT-23

LM-SM712 from Leiditech, 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 | PIN1 | passive | Protected line (I/O) per the datasheet's Pin1-or-Pin2-to-Pin3 ratings: reverse stand-off 12.0 V, breakdown 13.3 to 16.3 V at IR = 1 mA, reverse leakage 1.0 uA at VRWM = 12 V, and clamping voltage 24.0 V at IPP = 17 A. |
| 2 | PIN2 | passive | Protected line (I/O) with the same Pin1-or-Pin2-to-Pin3 limits: reverse stand-off 12.0 V, breakdown 13.3 to 16.3 V at IR = 1 mA, reverse leakage 1.0 uA at VRWM = 12 V, and clamping voltage 24.0 V at IPP = 17 A. |
| 3 | PIN3 | passive | Common terminal for the clamp ratings: reverse stand-off 7.0 V (Pin3-to-Pin1 or Pin2), breakdown 7.5 to 9.8 V at IR = 1 mA, reverse leakage 1.0 uA at VRWM = 7 V, and clamping voltage 18.0 V at IPP = 22 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Leiditech |
| Package | SOT-23 |
| Category | Circuit Protection |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `LM-SM712`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `lm-sm712-etched.step` / `lm-sm712-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm-sm712.step` / `lm-sm712.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Leiditech datasheet](docs/lm-sm712-datasheet.pdf) (4 pp, sha256 `94e930e203aba345`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lm-sm712-datasheet.pdf)