# UMA3N

**Changjing** · Digital Transistors · SOT-353

UMA3N from Changjing, in a SOT-353. 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 | B1 | input | Base of the first PNP transistor, entering through its built-in input resistor R1 (4.7 kΩ typ, 3.29-6.11 kΩ); VEBO limit is -5 V. |
| 2 | E | passive | Emitter pin shared by both PNP transistors (common emitter connection in the pinout diagram). |
| 3 | B2 | input | Base of the second PNP transistor, entering through its built-in input resistor R1 (4.7 kΩ typ, 3.29-6.11 kΩ); VEBO limit is -5 V. |
| 4 | C2 | passive | Collector of the second PNP transistor, rated VCEO -50 V and IC -100 mA continuous. |
| 5 | C1 | passive | Collector of the first PNP transistor, rated VCEO -50 V and IC -100 mA continuous. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-353 |
| Category | Transistors/Thyristors |
| Pins | 5 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input resistor | R1 | 3.29 | 4.7 | 6.11 | KΩ |  | 1 |
| Collector-base breakdown voltage | V(BR)CBO | -50 |  |  | V | IC=-50μA,IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -50 |  |  | V | IC=-1mA,IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE=-50μA,IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | -0.5 | μA | VCB=-50V,IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.5 | μA | VEB=4V,IC=0 | 1 |
| DC current gain | hFE | 100 |  | 600 |  | VCE=-5V,IC=-1mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.3 | V | IC=-5mA,IB=-0.25mA | 1 |
| Transition frequency | fT | 250 |  |  | MHz | VCE=-10V,IC=-5mA, f=100MHz | 1 |
| Collector-base voltage | VCBO |  |  | -50 | V | Ta=25℃ | 1 |
| Collector-emitter voltage | VCEO |  |  | -50 | V | Ta=25℃ | 1 |
| Emitter-base voltage | VEBO |  |  | -5 | V | Ta=25℃ | 1 |
| Collector current, continuous | IC |  |  | -100 | mA | Ta=25℃ | 1 |
| Collector dissipation | PC |  |  | 150 | mW | Ta=25℃ | 1 |
| Operation junction and storage temperature range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `UMA3N`
- Footprint: `Package_TO_SOT_SMD:SOT-353_SC-70-5`
- 3D model: SOT-353 (KiCad packages3D, STEP)
- 3D model files: `uma3n-etched.step` / `uma3n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uma3n.step` / `uma3n.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590931050904436736) (4 pp, sha256 `c99faf26adc14245`, 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/uma3n-datasheet.pdf)