# UMH3N

**Changjing** · Digital Transistors · SOT-363

UMH3N from Changjing, 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 | B1 | input | Base input of transistor 1; driven through internal 4.7 kΩ series resistor (R1, min 3.29 kΩ / max 6.11 kΩ); V(BR)EBO = 5 V max. |
| 2 | E1 | passive | Emitter of transistor 1; typically returned to ground; rated IC = 100 mA max, PC = 150 mW total package. |
| 3 | C1 | output | Collector of transistor 1 (open-collector); V(BR)CEO = 50 V, V(BR)CBO = 50 V, IC = 100 mA max, VCE(sat) = 0.3 V at IC = 5 mA. |
| 4 | C2 | output | Collector of transistor 2 (open-collector); V(BR)CEO = 50 V, V(BR)CBO = 50 V, IC = 100 mA max, VCE(sat) = 0.3 V at IC = 5 mA. |
| 5 | E2 | passive | Emitter of transistor 2; typically returned to ground; rated IC = 100 mA max, PC = 150 mW total package. |
| 6 | B2 | input | Base input of transistor 2; driven through internal 4.7 kΩ series resistor (R1, min 3.29 kΩ / max 6.11 kΩ); V(BR)EBO = 5 V max. |

## Key specifications

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

## 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 | V(BR)CBO | 50 |  |  | V | Ic=50μA | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 50 |  |  | V | Ic=1mA | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE=50μA | 1 |
| Collector cut-off current | ICBO |  |  | 0.5 | μA | VCB=50V | 1 |
| Emitter cut-off current | IEBO |  |  | 0.5 | μA | VEB=4V | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.3 | V | IC=5mA,IB=0.25mA | 1 |
| DC current transfer ratio | hFE | 100 |  | 600 |  | VCE=5V,IC=1mA | 1 |
| Input resistance | R1 | 3.29 | 4.7 | 6.11 | KΩ |  | 1 |
| Transition frequency | fT |  | 250 |  | MHz | VCE=10V ,IE=-5mA,f=100MHz | 1 |
| Collector-base voltage | V(BR)CBO |  |  | 50 | V |  | 1 |
| Collector-emitter voltage | V(BR)CEO |  |  | 50 | V |  | 1 |
| Emitter-base voltage | V(BR)EBO |  |  | 5 | V |  | 1 |
| Collector current | IC |  |  | 100 | mA |  | 1 |
| Collector power dissipation | PC |  |  | 150 | mW |  | 1 |
| Junction temperature | Tj |  |  | 150 |  |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 |  |  | 1 |

## CAD (KiCad official)

- Symbol: `UMH3N`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `umh3n-etched.step` / `umh3n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `umh3n.step` / `umh3n.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/8586175479908458496) (4 pp, sha256 `8e188281370e30db`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/umh3n-datasheet.pdf)