# MMSTA56

**Yangzhou Yangjie Elec Tech** · Bipolar (BJT) · SOT-323

MMSTA56 from Yangzhou Yangjie Elec Tech, in a SOT-323. 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 | B | input | Base of the PNP transistor; VEBO max is -4 V. |
| 2 | E | passive | Emitter of the PNP transistor; VEBO max is -4 V relative to base. |
| 3 | C | passive | Collector of the PNP transistor; IC max -500 mA and VCEO -80 V for MMSTA56. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOT-323 |
| 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 |
|---|---|---|---|---|---|---|---|
| Collector-base breakdown voltage | VCBO | -80 |  |  | V | IC=-100μA,IE=0; MMSTA56 | 2 |
| Collector-emitter breakdown voltage | VCEO | -80 |  |  | V | IC=-1mA,IB=0; MMSTA56 | 2 |
| Emitter-base breakdown voltage | VEBO | -4 |  |  | V | IE=-100μA,IC=0 | 2 |
| Collector-base cut-off current | ICBO |  |  | -0.1 | μA | VCB=-80V,IE=0; MMSTA56 | 2 |
| Emitter-base cut-off current | IEBO |  |  | -0.1 | uA | VEB=-4V,IC=0 | 2 |
| DC current gain | hFE | 100 |  |  |  | VCE=-1V,IC=-10mA | 2 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.25 | V | IC=-100mA,IB=-10mA | 2 |
| Base-emitter saturation voltage | VBE(sat) |  |  | -1.2 | V | IC=-100mA,IB=-10mA | 2 |
| Transition frequency | fT | 100 |  |  | MHz | VCE=-20V,IC=-10mA,f=100MHz | 2 |
| Collector-base voltage | VCBO | -80 |  |  | V | Ta=25℃; MMSTA56 | 1 |
| Collector-emitter voltage | VCEO | -80 |  |  | V | Ta=25℃; MMSTA56 | 1 |
| Emitter-base voltage | VEBO | -4 |  |  | V | Ta=25℃ | 1 |
| Collector current | IC | -500 |  |  | mA | Ta=25℃ | 1 |
| Collector power dissipation | PC |  |  | 200 | mW | Ta=25℃ | 1 |
| Operation junction temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `MMSTA56`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `mmsta56-etched.step` / `mmsta56-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmsta56.step` / `mmsta56.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917249243009024) (5 pp, sha256 `3ba05ccfc11db026`, retrieved 2026-10-17, 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/mmsta56-datasheet.pdf)