# XL1225

**ALJ** · Thyristors (SCR)/Modules · TO-92

XL1225 from ALJ, in a TO-92. 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 | KATHODE | passive | Cathode terminal of the XL1225 SCR; the datasheet rates the part for 400 V repetitive peak off-state voltage (VDRM/VRRM, RGK = 1 kΩ) and 0.8 A RMS on-state current at TC = 40°C. |
| 2 | GATE | input | Gate terminal used to trigger the SCR, with gate trigger current 200 µA and gate trigger voltage 0.8 V at VD = 7.0 V, and limits of 0.1 A peak gate current (10 µs max) and 150 mW peak gate power (20 ms max). |
| 3 | ANODE | passive | Anode terminal, the main current path of the SCR, which the datasheet rates for the same 400 V repetitive peak off-state voltage (RGK = 1 kΩ) and 0.8 A RMS on-state current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ALJ |
| Package | TO-92 |
| 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 |
|---|---|---|---|---|---|---|---|
| Repetitive peak off-state voltages | VDRM, VRRM |  |  | 400 | V | Tj = 40 to 125°C (rgk = 1kΩ) | 1 |
| RMS on-state current | IT(RMS) |  |  | 0.8 | A | TC= 40°C | 1 |
| Average on-state current | IT(AV) |  |  | 0.5 | V | Half cycle = 180 TC=40°C | 1 |
| Peak Reverse Gate Voltage | VGRM |  |  | 1 | A | IGR = 10μA | 1 |
| Peak gate current | IGM |  |  | 0.1 | A | 10μs Max | 1 |
| Peak gate power | PGM |  |  | 150 | mW | 20ms Max | 1 |
| Junction Temperature | Tj | -40 |  | 125 | °C |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | °C |  | 1 |
| Soldering Temperature | TSLD |  |  | 250 | °C | 6mm from case10s Max | 1 |
| Repetitive peak off-state current | IDRM |  |  | 0.1 | mA | VDRM (RGK = 1KΩ), Tj = 125°C | 1 |
| Repetitive peak off-state current | IRRM |  |  | 1 | µA | VDRM (RGK = 1KΩ), Tj = 25°C | 1 |
| Repetitive peak on-state voltage | VT |  |  | 1.4 | V | IT = 0.4A | 1 |
| Repetitive peak on-state voltage | VT |  |  | 2.2 | V | IT = 0.8A | 1 |
| On state threshold voltage | VT(TO) |  |  | 0.95 | V | Tj = 125°C | 1 |
| On state slope resistance | Rt |  |  | 600 | m | Tj = 125°C | 1 |
| Gate trigger current | IGT |  |  | 200 | µA | VD = 7.0V | 1 |
| Gate trigger voltage | VGT |  |  | 0.8 | V | VD = 7.0V | 1 |
| Holding current | IH |  |  | 5 | mA | RGK = 1KΩ | 1 |
| Latching current | IL |  |  | 6 | mA | RGK = 1KΩ | 1 |

## CAD (KiCad official)

- Symbol: `XL1225`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `xl1225-etched.step` / `xl1225-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `xl1225.step` / `xl1225.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ALJ datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603351562622418944) (2 pp, sha256 `d9483726769623f0`, retrieved 2026-10-18, 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/xl1225-datasheet.pdf)