# MMBTSC3356-7G

**CBI** · Bipolar (BJT) · SOT-23

MMBTSC3356-7G from CBI, in a SOT-23. 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 | Base | input | Base terminal of the NPN silicon epitaxial planar transistor, with an emitter-base voltage rating of VEBO 3 V and an emitter cutoff current IEBO of 1 µA max at VEB = 1 V. |
| 2 | Emitter | passive | Emitter terminal of the transistor, which must be connected to the guard terminal of the three-terminal capacitance bridge along with the case when measuring Cre. |
| 3 | Collector | passive | Collector terminal of the transistor, rated for VCBO 20 V, VCEO 12 V, and a collector current IC of 100 mA, with total power dissipation Ptot of 200 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-23 |
| 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 Voltage | VCBO |  |  | 20 | V |  | 1 |
| Collector Emitter Voltage | VCEO |  |  | 12 | V |  | 1 |
| Emitter Base Voltage | VEBO |  |  | 3 | V |  | 1 |
| Collector Current | IC |  |  | 100 | mA |  | 1 |
| Power Dissipation | Ptot |  |  | 200 | mW |  | 1 |
| Junction Temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage Temperature Range | TS | -65 |  | 150 | °C |  | 1 |
| DC Current Gain, Group Q | hFE | 50 |  | 100 |  | at VCE = 10 V, IC = 20 mA, Current Gain Group Q | 1 |
| DC Current Gain, Group R | hFE | 80 |  | 160 |  | at VCE = 10 V, IC = 20 mA, Current Gain Group R | 1 |
| DC Current Gain, Group S | hFE | 125 |  | 250 |  | at VCE = 10 V, IC = 20 mA, Current Gain Group S | 1 |
| Collector Cutoff Current | ICBO |  |  | 1 | µA | at VCB = 10 V | 1 |
| Emitter Cutoff Current | IEBO |  |  | 1 | µA | at VEB = 1 V | 1 |
| Feed-Back Capacitance | Cre |  | 0.55 | 1 | pF | at VCB = 10 V, f = 1 MHz; emitter and case connected to guard terminal of three-terminal capacitance bridge (footnote 1) | 1 |
| Noise Figure | NF |  | 1.1 | 2 | dB | at VCE = 10 V, IC = 7 mA, f = 1 GHz | 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 |
|---|---|---|---|---|
| housing | Abs |  | SOT-23 Plastic Package Absolute Maximum Ratings (Ta = 25 | 1 |

## CAD (KiCad official)

- Symbol: `MMBTSC3356-7G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbtsc3356-7g-etched.step` / `mmbtsc3356-7g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbtsc3356-7g.step` / `mmbtsc3356-7g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [CBI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590921058755432448) (3 pp, sha256 `21a01448ebd08e80`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/mmbtsc3356-7g-datasheet.pdf)