# U1AQ

**Yangzhou Yangjie Elec Tech** · Fast Recovery / High Efficiency Diodes · SOD-123

U1AQ from Yangzhou Yangjie Elec Tech, in a SOD-123. 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 end marked by the cathode line on the package body; rated for VRRM of 50 V (U1AQ), with 1.0 A average rectified output current. |
| 2 | A | passive | Anode, the end opposite the cathode line; forward voltage 0.92 V max at IF=1.0A, reverse recovery time 25 ns max. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Yangzhou Yangjie Elec Tech |
| Package | SOD-123 |
| 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 Repetitive Peak Reverse Voltage | VRRM |  |  | 50 | V |  | 1 |
| Maximum DC blocking Voltage | VDC |  |  | 50 | V |  | 1 |
| Maximum RMS Voltage | VRMS |  |  | 35 | V |  | 1 |
| Average rectified output current | IO |  |  | 1 | A | @60Hz sine wave, Resistance load, TL (Fig.1) | 1 |
| Forward Surge Current (Non-repetitive) | IFSM |  |  | 30 | A | @60Hz Half-sine wave,1 cycle, TJ=25℃ | 1 |
| Current squared time | I2t |  |  | 3.735 | A2s | @1ms≤t≤8.3ms TJ=25℃ | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Junction temperature | TJ | -55 |  | 150 | ℃ |  | 1 |
| Maximum instantaneous forward voltage | VF |  |  | 0.92 | V | IF=1.0A | 2 |
| Maximum reverse recovery time | TRR |  |  | 25 | ns | IF=0.5A,IR=1.0A,Irr=0.25A | 2 |
| Maximum DC reverse current at rated DC blocking voltage per diode, TJ=25℃ | IR |  |  | 2 | μA | VRM=VRRM; TJ=25℃ | 2 |
| Maximum DC reverse current at rated DC blocking voltage per diode, TJ=125℃ | IR |  |  | 20 | μA | VRM=VRRM; TJ=125℃ | 2 |
| Typical thermal resistance, junction to ambient | RθJ-A |  | 65 |  | ℃/W | Junction to ambient, PCB with 3mm*3mm copper pad areas | 2 |
| Typical thermal resistance, junction to lead | RθJ-L |  | 25 |  | ℃/W | Junction to lead, PCB with 3mm*3mm copper pad areas | 2 |
| Typical thermal resistance, junction to case | RθJ-C |  | 20 |  | ℃/W | Junction to case, PCB with 3mm*3mm copper pad areas | 2 |

## 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 |  | black | 4. Body color: Black | 4 |
| contacts |  | tin | ● Terminals: Tin plated leads, solderable per J-STD-002 and JESD22-B102 | 1 |

## CAD (KiCad official)

- Symbol: `U1AQ`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `u1aq-etched.step` / `u1aq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `u1aq.step` / `u1aq.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Yangzhou Yangjie Elec Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603384026535649280) (6 pp, sha256 `2415548ac87b5ed4`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+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/u1aq-datasheet.pdf)