# EMH1

**Changjing** · Digital Transistors · SOT-563

EMH1 from Changjing, in a SOT-563. 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 | E1 | power_in | Emitter (GND) of the first built-in-resistor NPN transistor Tr1, per the SOT-563 pin diagram. |
| 2 | IN1 | input | Input (base through built-in R1 22kΩ typ, R2/R1 ratio 1) of Tr1, with VI(off) min 0.5V and VI(on) max 3V and VIN rated -10 to 40V. |
| 3 | OUT2 | output | Collector output of the second transistor Tr2, rated IO 30mA and VCC 50V max. |
| 4 | E2 | power_in | Emitter (GND) of the second built-in-resistor NPN transistor Tr2, per the SOT-563 pin diagram. |
| 5 | IN2 | input | Input (base through built-in R1 22kΩ typ, R2/R1 ratio 1) of Tr2, with VI(off) min 0.5V and VI(on) max 3V and VIN rated -10 to 40V. |
| 6 | OUT1 | output | Collector output of the first transistor Tr1, rated IO 30mA and VCC 50V max. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-563 |
| Category | Triode/MOS Tube/Transistor |
| 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 |
|---|---|---|---|---|---|---|---|
| Input voltage (off) | VI(off) |  |  | 0.5 | V | VCC=5V, IO=100μA | 1 |
| Input voltage (on) | VI(on) | 3 |  |  | V | VO=0.2V, IO=5mA | 1 |
| Output voltage | VO(on) |  | 0.1 | 0.3 | V | IO/II=10mA/0.5mA | 1 |
| Input current | II |  |  | 0.36 | mA | VI=5V | 1 |
| Output current | IO(off) |  |  | 0.5 | μA | VCC=50V, VI=0 | 1 |
| DC current gain | GI | 56 |  |  |  | VO=5V, IO=5mA | 1 |
| Input resistance | R1 | 15.4 | 22 | 28.6 | KΩ |  | 1 |
| Resistance ratio | R2/R1 | 0.8 | 1 | 1.2 |  |  | 1 |
| Transition frequency | fT |  | 250 |  | MHz | VCE=10V, IE=-5mA, f=100MHz | 1 |
| Supply voltage | VCC |  |  | 50 | V | Ta=25℃ | 1 |
| Input voltage | VIN | -10 |  | 40 | V | Ta=25℃ | 1 |
| Output current | IO |  |  | 30 | mA | Ta=25℃ | 1 |
| Output current | IC(MAX) |  |  | 100 | mA | Ta=25℃ | 1 |
| Power dissipation | PD |  |  | 150 | mW | Ta=25℃ | 1 |
| Operation junction and storage temperature range | TJ, Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `EMH1`
- Footprint: `Package_TO_SOT_SMD:SOT-563`
- 3D model: SOT-563 (KiCad packages3D, STEP)
- 3D model files: `emh1-etched.step` / `emh1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `emh1.step` / `emh1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/emh1-datasheet.pdf) (3 pp, sha256 `02ee4a916a49e22d`, retrieved 2026-10-22, 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/emh1-datasheet.pdf)