# MMBFJ202

**onsemi** · MOSFETs · SOT-23

MMBFJ202 from onsemi, 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 | D | passive | Drain; the datasheet notes source and drain are interchangeable, with VDG rated at 40 V maximum. |
| 2 | S | passive | Source; interchangeable with drain per the datasheet note, with VGS rated at -40 V. |
| 3 | G | input | Gate of the N-channel JFET; forward gate current is limited to 50 mA maximum and gate-source breakdown voltage is -40 V minimum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| 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 Breakdown Voltage | V(BR)GSS | -40 |  |  | V | IG = -1.0 μA, VDS = 0 | 3 |
| Gate Reverse Current | IGSS |  |  | -100 | pA | VGS = -20 V, VDS = 0 | 3 |
| Gate-Source Cut-Off Voltage (MMBFJ202) | VGS(off) | -0.8 |  | -4 | V | VDS = 20 V, ID = 10 nA | 3 |
| Zero-Gate Voltage Drain Current (MMBFJ202) | IDSS | 0.9 |  | 4.5 | mA | VDS = 20 V, IGS = 0 | 3 |
| Forward Transfer Admittance (MMBFJ202) | yFS | 1000 |  |  | μmhos | VDS = 20 V, f = 1.0 kHz | 3 |
| Drain-Gate Voltage | VDG |  |  | 40 | V |  | 2 |
| Gate-Source Voltage | VGS | -40 |  |  | V |  | 2 |
| Forward Gate Current | IGF |  |  | 50 | mA |  | 2 |
| Operating and Storage Junction Temperature Range | TJ, TSTG | -55 |  | 150 | °C |  | 2 |
| Total Device Dissipation | PD |  |  | 350 | mW | Device mounted on FR-4 PCB 36mm × 18mm × 1.5mm; mounting pad for the collector lead minimum 6cm2 | 3 |
| Derate Above 25°C |  |  |  | 2.8 | mW/°C | Device mounted on FR-4 PCB 36mm × 18mm × 1.5mm; mounting pad for the collector lead minimum 6cm2 | 3 |
| Thermal Resistance, Junction-to-Ambient | RθJA |  |  | 357 | °C/W | Device mounted on FR-4 PCB 36mm × 18mm × 1.5mm; mounting pad for the collector lead minimum 6cm2 | 3 |

## CAD (KiCad official)

- Symbol: `MMBFJ202`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbfj202-etched.step` / `mmbfj202-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbfj202.step` / `mmbfj202.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/8588894410456752128) (10 pp, sha256 `26c79daa9020edaa`, retrieved 2026-10-19, 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/mmbfj202-datasheet.pdf)