# MMUN5311DW

**YFW** · Digital Transistors · SOT-363

MMUN5311DW from YFW, in a SOT-363. 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 | E2 | passive | Emitter of Q2 (NPN), shown in the schematic connected to the base through R2 (10 k for MMUN5311DW). |
| 2 | B2 | input | Base of Q2 (NPN), entering through series resistor R1 (10 k for MMUN5311DW). |
| 3 | C1 | passive | Collector of Q1 (PNP), shown at the bottom of the schematic; Q1 Vceo and Vcbo are rated 50 V and Ic 100 mA. |
| 4 | E1 | passive | Emitter of Q1 (PNP), shown at the top of the schematic, connected to the base through R2 (10 k). |
| 5 | B1 | input | Base of Q1 (PNP), entering through series resistor R1 (10 k for MMUN5311DW). |
| 6 | C2 | passive | Collector of Q2 (NPN), shown at the top of the schematic; Vceo and Vcbo are rated 50 V and Ic 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| Package | SOT-363 |
| Category | Transistors/Thyristors |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `MMUN5311DW`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `mmun5311dw-etched.step` / `mmun5311dw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmun5311dw.step` / `mmun5311dw.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603346084534374400) (7 pp, sha256 `db6d54177423bfe1`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/mmun5311dw-datasheet.pdf)