# MMBFJ211

**onsemi** · MOSFETs · SOT-23-3

MMBFJ211 from onsemi, in a SOT-23-3. 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 | Drain | passive | Drain terminal, interchangeable with the source; the drain-gate voltage is rated 25 V maximum (VDG). |
| 2 | Source | passive | Source terminal, interchangeable with the drain; the gate-source breakdown voltage V(BR)GSS is −25 V minimum. |
| 3 | Gate | input | Gate terminal; the gate-source voltage is rated −25 V and the forward gate current IGF is limited to 10 mA maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23-3 |
| 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 Breakdown Voltage | V(BR)GSS | -25 |  |  | V | IG = 1.0 A, VDS = 0 | 2 |
| Gate Reverse Current | IGSS |  |  | -100 | pA | VGS = 15 V, VDS = 0 | 2 |
| Gate-Source Cut-Off Voltage | VGS(off) | -2.5 |  | -4.5 | V | VDS = 15 V, ID = 1.0 nA | 2 |
| Zero-Gate Voltage Drain Current (Note 4) | IDSS | 7 |  | 20 | mA | VDS = 15 V, VGS = 0 | 2 |
| Common Source Forward Transconductance | gfs | 7000 |  | 12000 | mhos | VDS = 15 V, VGS = 0, f = 1.0 kHz | 2 |
| Common Source Output Conductance | goss |  |  | 200 | mhos | VDS = 15 V, VGS = 0, f = 1.0 kHz | 2 |
| Drain-Gate Voltage | VDG |  |  | 25 | V |  | 1 |
| Gate-Source Voltage | VGS | -25 |  |  | V |  | 1 |
| Forward Gate Current | IGF |  |  | 10 | mA |  | 1 |
| Operating and Storage Junction Temperature Range | TJ, TSTG | -55 |  | 150 | °C |  | 1 |
| Total Device Dissipation (MMBFJ211) | PD |  |  | 225 | mW | TA = 25°C, device mounted on FR-4 PCB 36 mm x 18 mm x 1.5 mm, collector pad min 6 cm2 (Note 3) | 1 |
| Derate Above 25°C (MMBFJ211) | PD derate |  |  | 1.8 | mW/°C | Above 25°C, Note 3 | 1 |
| Thermal Resistance, Junction-to-Ambient (MMBFJ211) | RJA |  |  | 556 | °C/W | Note 3 | 1 |

## CAD (KiCad official)

- Symbol: `MMBFJ211`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `mmbfj211-etched.step` / `mmbfj211-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbfj211.step` / `mmbfj211.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589836998937772032) (8 pp, sha256 `d883d483cd3509d8`, 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/mmbfj211-datasheet.pdf)