# MMBTRC103SS

**CBI** · Digital Transistors · SOT-23

MMBTRC103SS 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 | Input terminal (labeled Base, R1 Input) with internal bias resistor R1 = 22 kΩ for MMBTRC103SS; input voltage is rated 40 V / -10 V in absolute maximum ratings, and VI(ON) is max 3 V at VO = 0.2 V, IO = 5 mA. |
| 2 | Emitter | passive | Common emitter terminal (labeled Emitter, Common), associated with the internal bias resistor R2 = 22 kΩ listed for MMBTRC103SS. |
| 3 | Collector | output | Output terminal (labeled Collector, Output); output voltage is limited to 50 V and output current to 100 mA, with VO(ON) max 0.3 V at IO = 10 mA, II = 0.5 mA. |

## 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage | VO |  |  | 50 | V |  | 1 |
| Input Voltage (MMBTRC103SS) | VI | -10 |  | 40 | V |  | 1 |
| Output Current | IO |  |  | 100 | mA |  | 1 |
| Total Power Dissipation | Ptot |  |  | 200 | mW |  | 1 |
| Junction Temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage Temperature Range | Tstg | -55 |  | 150 | °C |  | 1 |
| DC Current Gain (MMBTRC103SS) | GI | 70 |  |  |  | at VO = 5 V, IO = 10 mA | 2 |
| Output Cutoff Current | IO(OFF) |  |  | 500 | nA | at VO = 50 V | 2 |
| Input Current (MMBTRC103SS) | II |  |  | 0.36 | mA | at VI = 5 V | 2 |
| Output Voltage (ON) | VO(ON) |  |  | 0.3 | V | at IO = 10 mA, II = 0.5 mA | 2 |
| Input Voltage (ON) (MMBTRC103SS) | VI(ON) |  |  | 3 | V | at VO = 0.2 V, IO = 5 mA | 2 |
| Input Voltage (OFF) (MMBTRC101SS~104SS, applies to MMBTRC103SS) | VI(OFF) | 1 |  |  | V | at VO = 5 V, IO = 0.1 mA | 2 |

## 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: `MMBTRC103SS`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbtrc103ss-etched.step` / `mmbtrc103ss-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbtrc103ss.step` / `mmbtrc103ss.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/8590917248792014848) (6 pp, sha256 `2b330cd02ce10f82`, retrieved 2026-10-17, 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/mmbtrc103ss-datasheet.pdf)