# X0405MF-252

**KY** · Thyristors (SCR)/Modules · TO-252

X0405MF-252 from KY, in a TO-252. 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 (K) of the SCR; the datasheet symbol labels this terminal K(1). |
| 2 | A | passive | Anode (A) of the SCR, also the tab; the TO-252 drawing marks the tab as 2 and the symbol labels it A(2), with VDRM/VRRM of 600V. |
| 3 | G | input | Gate (G) trigger input; the symbol labels it G(3), with VGT ≤0.8V and IGT ≤120uA at VD=12V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KY |
| Package | TO-252 |
| 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 Voltage (X0405 column) | VDRM/VRRM |  |  | 600 | V |  | 3 |
| Repetitive Peak Off-State Current | IDRM |  |  | 5 | uA | Tc=25°C | 3 |
| Repetitive Peak Off-State Current | IDRM |  |  | 100 | uA | Tc=110°C | 3 |
| Repetitive Peak Reverse Current | IRRM |  |  | 5 | uA | Tc=25°C | 3 |
| Repetitive Peak Reverse Current | IRRM |  |  | 100 | uA | Tc=110°C | 3 |
| Forward on voltage | VTM |  |  | 1.7 | V | IT=8A tp=380us | 3 |
| Gate nontrigger voltage | VGD | 0.2 |  |  | V | VD=VDRM,Tj=110°C,RGK=1KΩ,RL=3.3KΩ | 3 |
| Latching current | IL |  |  | 6 | mA | IG=1.2IGT | 3 |
| Holding current | IH |  |  | 5 | mA | VD=12V,IGT=0.1A | 3 |
| Gate trigger voltage | VGT |  |  | 0.8 | V | VD=12V | 3 |
| Gate trigger current | IGT |  |  | 120 | uA | VD=12V,IT=0.1A | 3 |
| Critical-rate of rise of commutation voltage | dv/dt | 10 |  |  | V/us | VD=2/3VDRM,Tj=110°C,RGK=1KΩ | 3 |
| R.M.S On-State Current | IT(RMS) |  |  | 4 | A |  | 3 |
| Average On-State Current | IT(AV) |  |  | 2.5 | A |  | 3 |
| Surge On-State Current | ITSM |  |  | 30 | A | F=50Hz,tp=10ms | 3 |
| I²t for fusing | I²t |  |  | 4.5 | A²s | Tp=10ms | 3 |
| Peak Gate Current | IGM |  |  | 1.2 | A | tp=20uS,Tj=110°C | 3 |
| Average Gate Power Dissipation | PG(AV) |  |  | 0.2 | W | Tj=110°C | 3 |
| Peak Gate Power Dissipation | PGM |  |  | 1 | W | tp=20uS,Tj=110°C | 3 |
| Operating Junction Temperature | Tj | -40 |  | 125 | °C |  | 3 |
| Storage Temperature | TSTG | -40 |  | 150 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `X0405MF-252`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `x0405mf-252-etched.step` / `x0405mf-252-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `x0405mf-252.step` / `x0405mf-252.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KY datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603009491642163200) (7 pp, sha256 `09894c153b8714bf`, retrieved 2026-10-17, 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/x0405mf-252-datasheet.pdf)