# M251LE3AE

**Nuvoton Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · LQFP-48(7x7)

M251LE3AE from Nuvoton Tech, in a LQFP-48(7x7). 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 | PB.5 | bidirectional | General-purpose I/O port B bit 5; the datasheet gives no alternate functions for this pin. |
| 2 | PB.4 | bidirectional | General-purpose I/O port B bit 4; the datasheet gives no alternate functions for this pin. |
| 3 | PB.3 | bidirectional | General-purpose I/O port B bit 3; the datasheet gives no alternate functions for this pin. |
| 4 | PB.2 | bidirectional | General-purpose I/O port B bit 2; the datasheet gives no alternate functions for this pin. |
| 5 | PB.1 | bidirectional | General-purpose I/O port B bit 1; the datasheet gives no alternate functions for this pin. |
| 6 | PB.0 | bidirectional | General-purpose I/O port B bit 0; the datasheet gives no alternate functions for this pin. |
| 7 | PA.11 | bidirectional | General-purpose I/O port A bit 11; the datasheet gives no alternate functions for this pin. |
| 8 | PA.10 | bidirectional | General-purpose I/O port A bit 10; the datasheet gives no alternate functions for this pin. |
| 9 | PA.9 | bidirectional | General-purpose I/O port A bit 9; the datasheet gives no alternate functions for this pin. |
| 10 | PA.8 | bidirectional | General-purpose I/O port A bit 8; the datasheet gives no alternate functions for this pin. |
| 11 | PF.5 | bidirectional | General-purpose I/O port F bit 5; the datasheet gives no alternate functions for this pin. |
| 12 | PF.4 | bidirectional | General-purpose I/O port F bit 4; the datasheet gives no alternate functions for this pin. |
| 13 | PF.3 | bidirectional | General-purpose I/O port F bit 3; the datasheet gives no alternate functions for this pin. |
| 14 | PF.2 | bidirectional | General-purpose I/O port F bit 2; the datasheet gives no alternate functions for this pin. |
| 15 | PA.7 | bidirectional | General-purpose I/O port A bit 7; the datasheet gives no alternate functions for this pin. |
| 16 | PA.6 | bidirectional | General-purpose I/O port A bit 6; the datasheet gives no alternate functions for this pin. |
| 17 | PA.5 | bidirectional | General-purpose I/O port A bit 5; the datasheet gives no alternate functions for this pin. |
| 18 | PA.4 | bidirectional | General-purpose I/O port A bit 4; the datasheet gives no alternate functions for this pin. |
| 19 | PA.3 | bidirectional | General-purpose I/O port A bit 3; the datasheet gives no alternate functions for this pin. |
| 20 | PA.2 | bidirectional | General-purpose I/O port A bit 2; the datasheet gives no alternate functions for this pin. |
| 21 | PA.1 | bidirectional | General-purpose I/O port A bit 1; the datasheet gives no alternate functions for this pin. |
| 22 | PA.0 | bidirectional | General-purpose I/O port A bit 0; the datasheet gives no alternate functions for this pin. |
| 23 | VDDIO | power_in | Supply pin for the second I/O voltage domain (VAI), which supports 1.65 to 5.5 V for the VAI I/O pins. |
| 24 | nRESET | input | External reset input pin, active low; the datasheet gives no electrical limits for it. |
| 25 | PF.0 | bidirectional | General-purpose I/O port F bit 0; the datasheet gives no alternate functions for this pin. |
| 26 | PF.1 | bidirectional | General-purpose I/O port F bit 1; the datasheet gives no alternate functions for this pin. |
| 27 | PC.5 | bidirectional | General-purpose I/O port C bit 5; the datasheet gives no alternate functions for this pin. |
| 28 | PC.4 | bidirectional | General-purpose I/O port C bit 4; the datasheet gives no alternate functions for this pin. |
| 29 | PC.3 | bidirectional | General-purpose I/O port C bit 3; the datasheet gives no alternate functions for this pin. |
| 30 | PC.2 | bidirectional | General-purpose I/O port C bit 2; the datasheet gives no alternate functions for this pin. |
| 31 | PC.1 | bidirectional | General-purpose I/O port C bit 1; the datasheet gives no alternate functions for this pin. |
| 32 | PC.0 | bidirectional | General-purpose I/O port C bit 0; the datasheet gives no alternate functions for this pin. |
| 33 | PA.12 | bidirectional | General-purpose I/O port A bit 12; the datasheet gives no alternate functions for this pin. |
| 34 | PA.13 | bidirectional | General-purpose I/O port A bit 13; the datasheet gives no alternate functions for this pin. |
| 35 | PA.14 | bidirectional | General-purpose I/O port A bit 14; the datasheet gives no alternate functions for this pin. |
| 36 | PA.15 | bidirectional | General-purpose I/O port A bit 15; the datasheet gives no alternate functions for this pin. |
| 37 | VSS | power_in | Digital ground pin. |
| 38 | LDO_CAP | passive | Pin for the capacitor of the built-in LDO; the datasheet gives no value. |
| 39 | VDD | power_in | Digital power supply pin; the device supply range is 1.8 V to 5.5 V. |
| 40 | PC.14 | bidirectional | General-purpose I/O port C bit 14; the datasheet gives no alternate functions for this pin. |
| 41 | PB.15 | bidirectional | General-purpose I/O port B bit 15; the datasheet gives no alternate functions for this pin. |
| 42 | PB.14 | bidirectional | General-purpose I/O port B bit 14; the datasheet gives no alternate functions for this pin. |
| 43 | PB.13 | bidirectional | General-purpose I/O port B bit 13; the datasheet gives no alternate functions for this pin. |
| 44 | PB.12 | bidirectional | General-purpose I/O port B bit 12; the datasheet gives no alternate functions for this pin. |
| 45 | AVDD | power_in | Analog power supply pin; the datasheet gives no separate range for it. |
| 46 | AVSS | power_in | Analog ground pin. |
| 47 | PB.7 | bidirectional | General-purpose I/O port B bit 7; the datasheet gives no alternate functions for this pin. |
| 48 | PB.6 | bidirectional | General-purpose I/O port B bit 6; the datasheet gives no alternate functions for this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nuvoton Tech |
| Package | LQFP-48(7x7) |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 48 |

## CAD (KiCad official)

- Symbol: `M251LE3AE`
- Footprint: `Package_QFP:LQFP-48_7x7mm_P0.5mm`
- 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
- 3D model files: `m251le3ae-etched.step` / `m251le3ae-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `m251le3ae.step` / `m251le3ae.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nuvoton Tech datasheet](docs/m251le3ae-datasheet.pdf) (29 pp, sha256 `e325cf55bfc3d3c8`, retrieved 2026-10-27, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-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/m251le3ae-datasheet.pdf)