# ME2129FM5G

**MICRONE** · DC-DC Converters · SOT-23-5

ME2129FM5G from MICRONE, in a SOT-23-5. 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 | CE | input | Chip enable/shutdown pin; VCE=0V shuts down the device (VSL1 max 0.3V for stop of oscillation, VSH min 0.75V), with absolute maximum of -0.3 to VDD+0.3V. |
| 2 | LX | output | Switch node connected to the inductor and diode, with LX voltage -0.3 to VDD+0.3V and switch current up to ±1000mA absolute maximum. |
| 3 | GND | power_in | Ground pin. |
| 4 | VDD | power_in | IC power supply pin, absolute maximum -0.3 to 6.5V, recommended 1.8V≤VDD<6V for stable output voltage and oscillation frequency. |
| 5 | FB | input | Feedback voltage pin with a feedback threshold VFB of 1.225V min, 1.25V typ, 1.275V max, set via output voltage resistors R1 and R2. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MICRONE |
| Package | SOT-23-5 |
| Category | Power Management ICs |
| Pins | 5 |

## 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 | ppa |  | body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro | 14 |

## CAD (KiCad official)

- Symbol: `ME2129FM5G`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `me2129fm5g-etched.step` / `me2129fm5g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `me2129fm5g.step` / `me2129fm5g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MICRONE datasheet](docs/me2129fm5g-datasheet.pdf) (14 pp, sha256 `2d66385b1e75c741`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/me2129fm5g-datasheet.pdf)