# BM3402

**BORN** · MOSFETs · SOT-23

BM3402 from BORN, 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 | G | input | Gate; 3.3V logic-level drive with VGS(TH) 0.5 to 1.2 V and absolute maximum VGS of ±16 V. |
| 2 | S | passive | Source of the N-channel MOSFET; body diode continuous source current is 1.8 A max. |
| 3 | D | passive | Drain; V(BR)DSS is 30 V minimum and continuous drain current is 5.1 A at TA=25°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BORN |
| 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 |
|---|---|---|---|---|---|---|---|
| Gate-Source Voltage | VGS | -16 |  | 16 | V |  | 1 |
| Maximum Junction Temperature | TJ |  |  | 150 | °C |  | 1 |
| Storage Temperature Range | TSTG | -50 |  | 150 | °C |  | 1 |
| Pulse Drain Current | IDM |  |  | 20.4 | A | TA=25°C; pulse tested, see note ① (pulse width limited by Tj max) | 1 |
| Continuous Drain Current | ID |  |  | 5.1 | A | TA=25°C | 1 |
| Continuous Drain Current | ID |  |  | 4 | A | TA=70°C | 1 |
| Maximum Power Dissipation | PD |  |  | 1.5 | W | TA=25°C | 1 |
| Maximum Power Dissipation | PD |  |  | 0.9 | W | TA=70°C | 1 |
| Thermal Resistance Junction-Ambient | RθJA |  |  | 80 | °C/W |  | 1 |
| Drain-Source Breakdown Voltage | V(BR)DSS | 30 |  |  | V | VGS=0V ID=250μA | 2 |
| Zero Gate Voltage Drain Current (TA=25°C) | IDSS |  |  | 1 | μA | VDS=30V, VGS=0V | 2 |
| Zero Gate Voltage Drain Current (TA=125°C) | IDSS |  |  | 100 | uA | VDS=24V, VGS=0V | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±16V, VDS=0V | 2 |
| Gate Threshold Voltage | VGS(TH) | 0.5 | 0.8 | 1.2 | V | VDS=VGS, ID=250μA | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 28 | 36 | mΩ | VGS=10V, ID=4A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 34 | 50 | mΩ | VGS=4.5V, ID=3A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 40 | 60 | mΩ | VGS=3.3V, ID=2A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 55 | 80 | mΩ | VGS=2.5V, ID=1A | 2 |
| Source Drain Current (Body Diode) | IS |  |  | 1.8 | A | TA=25℃ | 2 |
| Forward On Voltage | VSD |  | 0.85 | 1.2 | V | Tj=25℃, ISD=4A, VGS=0V | 2 |

## CAD (KiCad official)

- Symbol: `BM3402`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bm3402-etched.step` / `bm3402-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bm3402.step` / `bm3402.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BORN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588912061045096448) (4 pp, sha256 `0b80ffffeaa2fad2`, 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/bm3402-datasheet.pdf)