# MMUN2232

**CBI** · Bipolar (BJT) · SOT-23

MMUN2232 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, connected through the built-in input resistor R1 (4.7 kΩ for MMUN2232) and R2 (4.7 kΩ) in the bias network. |
| 2 | Emitter | passive | Common emitter terminal; the device absolute maximum ratings are VCEO 50 V, VEBO not stated, IC 100 mA, Ptot 200 mW, Tj 150 °C. |
| 3 | Collector | output | Output terminal; for MMUN2232 VCE(sat) is at most 0.25 V at IC = 10 mA, IB = 1 mA, and the device is rated VCBO 50 V and IC 100 mA maximum. |

## 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 | 15 |  |  |  | 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 |  |  | 1.5 | 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 |
| Output Voltage (off) | VOH | 4.9 |  |  | V | at VCC = 5 V, VB = 0.5 V, RL = 1 KΩ | 3 |
| Input Resistor | R1 | 3.3 |  | 6.1 | KΩ |  | 3 |
| Resistor Ratio MMUN2230/MMUN2231/MMUN2232 | R1/R2 | 0.8 |  | 1.2 |  |  | 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 | Ta = 25 °C | 1 |
| Storage Temperature Range | TS | -55 |  | 150 | °C |  | 1 |
| Input Resistor R1 (nominal, Resistor Values table) | R1 |  | 4.7 |  | KΩ |  | 1 |
| Resistor R2 (nominal, Resistor Values table) | R2 |  | 4.7 |  | KΩ |  | 1 |

## CAD (KiCad official)

- Symbol: `MMUN2232`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmun2232-etched.step` / `mmun2232-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmun2232.step` / `mmun2232.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/8590234610279362560) (4 pp, sha256 `bd452c901e7dd07f`, 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/mmun2232-datasheet.pdf)