# U1M

**XUMAO** · Fast Recovery / High Efficiency Diodes · SOD-123FL

U1M from XUMAO, in a SOD-123FL. 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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | XUMAO |
| Package | SOD-123FL |
| Category | Diodes |
| Pins | 2 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Maximum Recurrent Peak Reverse Voltage (U1M) | VRRM |  |  | 1000 | V |  | 1 |
| Maximum RMS Voltage (U1M) | VRMS |  |  | 700 | V |  | 1 |
| Maximum DC Blocking Voltage (U1M) | VDC |  |  | 1000 | V |  | 1 |
| Maximum Average Forward Rectified Current | IO(AV) |  |  | 1 | A | TL = 100 ℃ | 1 |
| Peak Forward Surge Current | IFSM |  |  | 25 | A | 8.3ms single half-sine-wave superimposed on rated load (JEDEC Method) | 1 |
| Forward Surge Current (Non-repetitive) |  |  |  | 50 | A | @1ms, square wave, 1 cycle, Tj=25℃ | 1 |
| Current squared time | I2t |  |  | 2.6 | A2s | @1ms≤t≤8.3ms Tj=25℃, rating per diode | 1 |
| Maximum Reverse Current at rated DC blocking voltage | IR |  |  | 5 | uA | TA = 25℃ | 1 |
| Maximum Reverse Current at rated DC blocking voltage | IR |  |  | 100 | uA | TA = 100℃ | 1 |
| Typical Junction Capacitance | CJ |  | 17 |  | pF |  | 1 |
| Typical Thermal Resistance Between junction and ambient | RQJa |  | 75 |  | ℃/W |  | 1 |
| Operating Junction Temperature Range | TJ | -55 |  | 150 | ℃ |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |

## 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 |
|---|---|---|---|---|
| contacts |  | tin | Terminals:Tin Plated leads, solderable per Mil-STD-750 Method 2026 | 1 |

## CAD (KiCad official)

- Symbol: `U1M`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123FL (KiCad packages3D, STEP)
- 3D model files: `u1m-etched.step` / `u1m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `u1m.step` / `u1m.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [XUMAO datasheet](docs/u1m-datasheet.pdf) (5 pp, sha256 `e37308d9565d4d04`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/u1m-datasheet.pdf)