# TYN825

**KY** · Thyristors (SCR)/Modules · TO-263

TYN825 from KY, in a TO-263. 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 of the SCR; the datasheet symbol labels it K(1). |
| 2 | A | passive | Anode of the SCR, also connected to the tab; the datasheet symbol labels it A(2). |
| 3 | G | input | Gate trigger input; VGT is at most 1.3 V and IGT at most 40 mA at VD=12V, and the datasheet symbol labels it G(3). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KY |
| Package | TO-263 |
| 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 | VDRM |  |  | 800 | V |  | 3 |
| R.M.S On-State Current | IT(RMS) |  |  | 25 | A |  | 3 |
| Surge On-State Current | ITSM |  |  | 300 | A | F=50Hz,tp=10ms | 3 |
| I²t for fusing | I²t |  |  | 450 | A²s | Tp=10ms | 3 |
| Peak Gate Current | IGM |  |  | 4 | A | tp=20us Tj=110°C | 3 |
| Average Gate Power Dissipation | PG(AV) |  |  | 1 | W | Tj=125°C | 3 |
| Peak Gate Current | PGM |  |  | 5 | W | Tj=125°C | 3 |
| Operating Junction Temperature | Tj | -40 |  | 125 | °C |  | 3 |
| Storage Temperature | TSTG | -40 |  | 150 | °C |  | 3 |
| Repetitive Peak Off-State Current | IDRM |  |  | 10 | uA | Tc=25°C | 3 |
| Repetitive Peak Off-State Current | IDRM |  |  | 4 | mA | Tc=125°C | 3 |
| Repetitive Peak Reverse Current | IRRM |  |  | 10 | uA | Tc=25°C | 3 |
| Repetitive Peak Reverse Current | IRRM |  |  | 4 | mA | Tc=125°C | 3 |
| Forward "on" voltage | VTM |  |  | 1.55 | V | IT=50A tp=380us | 3 |
| Gate nontrigger voltage | VGD | 0.25 |  |  | V | VD=VDRM,Tj=125°C, RL=3.3KΩ | 3 |
| Latching current | IL |  |  | 90 | mA | IG=1.2IGT | 3 |
| Holding current | IH |  |  | 80 | mA | VD=12V ,IGT=0.1A | 3 |
| Gate trigger voltage | VGT |  |  | 1.3 | V | VD=12V | 3 |
| Gate trigger current | IGT |  |  | 40 | mA | VD=12V,IT=0.1A | 3 |
| Critical-rate of rise of commutation voltage | dv/dt | 200 |  |  | V/us | VD=2/3VDRM,Tj=110°C,RGK=1KΩ | 3 |
| Critical-rate of rise of commutation current | di/dt | 50 |  |  | A/us | IG=2XIG,tr≤100us,Tj=125°C | 3 |

## CAD (KiCad official)

- Symbol: `TYN825`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263 (KiCad packages3D, STEP)
- 3D model files: `tyn825-etched.step` / `tyn825-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tyn825.step` / `tyn825.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/8590909355174936576) (7 pp, sha256 `ec560678504950d8`, retrieved 2026-10-20, 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/tyn825-datasheet.pdf)