# MMUN2133

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

MMUN2133 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 input terminal, driven through the internal input resistor R1, which is 4.7 kΩ for the MMUN2133 variant. |
| 2 | Emitter | passive | Common emitter terminal; the datasheet specifies the emitter-base cutoff current for the MMUN2133 at -VEB = 6 V (max 0.18 mA). |
| 3 | Collector | output | Collector output terminal, rated at -VCEO 50 V and -IC 100 mA maximum, with the internal bias resistor R2 at 47 kΩ for the MMUN2133. |

## 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 |
|---|---|---|---|---|---|---|---|
| DC Current Gain | hFE | 80 |  |  |  | at -VCE = 10 V, -IC = 5 mA | 2 |
| Collector Base Cutoff Current | -ICBO |  |  | 100 | nA | at -VCB = 50 V | 2 |
| Collector Emitter Cutoff Current | -ICEO |  |  | 500 | nA | at -VCE = 50 V | 2 |
| Emitter Base Cutoff Current | -IEBO |  |  | 0.18 | mA | at -VEB = 6 V | 2 |
| Collector Base Breakdown Voltage | -V(BR)CBO | 50 |  |  | V | at -IC = 10 µA | 2 |
| Collector Emitter Breakdown Voltage | -V(BR)CEO | 50 |  |  | V | at -IC = 2 mA | 2 |
| Collector Emitter Saturation Voltage | -VCEsat |  |  | 0.25 | V | at -IC = 10 mA, -IB = 1 mA | 2 |
| Output Voltage (on) | -VOL |  |  | 0.2 | V | at -VCC = 5 V, -VB = 2.5 V, RL = 1 KΩ | 3 |
| Input Resistor | R1 | 3.3 |  | 6.1 | KΩ |  | 3 |
| Resistor Ratio | R1/R2 | 0.055 |  | 0.185 |  | MMUN2133 | 3 |
| Collector Base Voltage | -VCBO |  |  | 50 | V | Ta = 25 °C | 1 |
| Collector Emitter Voltage | -VCEO |  |  | 50 | V | Ta = 25 °C | 1 |
| Collector Current | -IC |  |  | 100 | mA | Ta = 25 °C | 1 |
| Total Power Dissipation | Ptot |  |  | 200 | mW | Ta = 25 °C | 1 |
| Junction Temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage Temperature Range | TS | -55 |  | 150 | °C |  | 1 |
| Resistor R1 (nominal) | R1 |  | 4.7 |  | KΩ | nominal, Resistor Values table | 1 |
| Resistor R2 (nominal) | R2 |  | 47 |  | KΩ | nominal, Resistor Values table | 1 |

## CAD (KiCad official)

- Symbol: `MMUN2133`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmun2133-etched.step` / `mmun2133-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmun2133.step` / `mmun2133.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/8590917251094958080) (4 pp, sha256 `f93693c975628bee`, retrieved 2026-10-19, 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/mmun2133-datasheet.pdf)