# MJD350T4

**STMicroelectronics** · Bipolar (BJT) · TO-252

MJD350T4 from STMicroelectronics, in a TO-252. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | Base | input | Base input terminal for transistor control, rated for VEBO (Emitter-Base Voltage) max 3V, controlling collector-emitter conduction. |
| 2 | Collector | passive | Collector terminal connected to metal tab, sustaining VCBO and VCEO max 300V each, with IC max 0.5A and ICM max 0.75A. |
| 3 | Emitter | passive | Emitter terminal providing return path for collector current, referenced in VCBO (IE=0) and VCEO measurements, completing the BJT junction. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TO-252 |
| 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 Cut-off Current (VBE = 0) | ICBO |  |  | 0.1 | mA | VCB = 300 V | 2 |
| Emitter Cut-off Current (IC = 0) | IEBO |  |  | 0.1 | mA | VEB = 3 V | 2 |
| Collector-Emitter Sustaining Voltage (IB = 0) | VCEO(sus) | 300 |  |  | V | IC = 1 mA | 2 |
| DC Current Gain | hFE | 30 |  | 240 |  | IC = 50 mA VCE = 10 V; pulsed: pulse duration = 300 µs, duty cycle ≤ 2 % | 2 |
| Collector-Base Voltage (IE = 0) | VCBO |  |  | 300 | V | IE = 0 | 1 |
| Collector-Emitter Voltage (IB = 0) | VCEO |  |  | 300 | V | IB = 0 | 1 |
| Emitter-Base Voltage (IC = 0) | VEBO |  |  | 3 | V | IC = 0 | 1 |
| Collector Current | IC |  |  | 0.5 | A |  | 1 |
| Collector Peak Current | ICM |  |  | 0.75 | A | tp = 25 °C | 1 |
| Total Power Dissipation | Ptot |  |  | 15 | W | Tcase ≤ 25 °C | 1 |
| Storage Temperature | Tstg | -65 |  | 150 | °C |  | 1 |
| Max Operating Junction Temperature | Tj |  |  | 150 | °C |  | 1 |
| Thermal Resistance Junction-case Max | Rthj-case |  |  | 8.33 | °C/W |  | 2 |
| Thermal Resistance Junction-ambient Max | Rthj-amb |  |  | 100 | °C/W |  | 2 |

## CAD (KiCad official)

- Symbol: `MJD350T4`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `mjd350t4-etched.step` / `mjd350t4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mjd350t4.step` / `mjd350t4.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586202516833390592) (5 pp, sha256 `a6cc88d76e0c4d05`, retrieved 2026-09-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/mjd350t4-datasheet.pdf)