# LBSS139LT1G

**LRC** · MOSFETs · SOT-23

LBSS139LT1G from LRC, 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 | Gate | input | Gate terminal with ESD protection to 1500V; gate-to-source voltage limited to ±20 Vdc continuous, with threshold VGS(th) of 0.5V to 1.5V. |
| 2 | Source | passive | Source terminal of the N-channel MOSFET; continuous drain current is 200 mAdc (800 mAdc pulsed) at TA = 25°C. |
| 3 | Drain | passive | Drain terminal of the N-channel MOSFET; drain-source voltage is limited to 50 Vdc. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Drain–Source Breakdown Voltage | VBRDSS | 50 |  |  | Vdc | VGS = 0, ID = 250 μAdc | 2 |
| Gate Threshold Voltage | VGS(th) | 0.5 |  | 1.5 | Vdc | VDS = VGS, ID = 1.0 mAdc | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 0.1 | μAdc | VGS = 0, VDS = 25 Vdc | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 0.5 | μAdc | VGS = 0, VDS = 50 Vdc | 2 |
| Gate–Body Leakage Current, Forward | IGSSF |  |  | 10 | μAdc | VGS = 20 Vdc | 2 |
| Gate–Body Leakage Current, Reverse | IGSSR |  |  | -10 | μAdc | VGS = -20 Vdc | 2 |
| Static Drain–Source On–State Resistance | RDS(on) |  |  | 10 | Ohms | VGS = 2.75 Vdc, ID < 200 mAdc, TA = –40°C to +85°C | 2 |
| Forward Transconductance | gfs | 100 |  |  | mS | VDS = 25 Vdc, ID = 200 mAdc, f = 1.0 kHz | 2 |
| Gate–Source Voltage – Continuous | VGS | -20 |  | 20 | Vdc | Continuous | 1 |
| Drain–Source Voltage | VDSS |  |  | 50 | Vdc |  | 1 |
| Drain Current – Continuous | ID |  |  | 200 | mAdc | TA = 25°C | 1 |
| Drain Current – Pulsed | IDM |  |  | 800 | mAdc | tp ≤ 10 μs | 1 |
| Total Device Dissipation, FR-4 Board | PD |  |  | 225 | mW | FR-4 board (Note 1), TA = 25°C | 1 |
| Thermal Resistance, Junction–to–Ambient | RΘJA |  | 556 |  | °C/W | FR-4 board (Note 1) | 1 |
| Junction and Storage Temperature | TJ,Tstg | -55 |  | 150 | °C |  | 1 |
| Maximum Lead Temperature for Soldering Purposes | TL |  |  | 260 | °C | 10 seconds | 1 |

## CAD (KiCad official)

- Symbol: `LBSS139LT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `lbss139lt1g-etched.step` / `lbss139lt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lbss139lt1g.step` / `lbss139lt1g.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/8588884465108467712) (7 pp, sha256 `b3d99d6c4802318f`, retrieved 2026-10-09, 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/lbss139lt1g-datasheet.pdf)