# BTA26

**WEIDA** · TRIACs · TO-220

BTA26 from WEIDA, in a TO-220. 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 | T1 | passive | Main terminal 1 of the triac, the current return side; the device is rated for 25 A IT(RMS) and VDRM/VRRM of 600/800/1200/1600 V. |
| 2 | T2 | passive | Main terminal 2 of the triac; the insulated TO-220A package isolates all three terminals from the heatsink with a rated insulation voltage of 2500 VRMS. |
| 3 | G | input | Gate trigger terminal; gate trigger current IGT is max 35 mA (CW) or 50 mA (BW) at VD=12 V, RL=33 Ω, with peak gate current IGM of 4 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WEIDA |
| Package | TO-220 |
| Category | Triode/MOS Tube/Transistor |
| 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 |
|---|---|---|---|---|---|---|---|
| On-state voltage | VTM |  |  | 1.5 | V | ITM=35A tp=380μs Tj=25℃ | 3 |
| Off-state/reverse leakage current | IDRM/IRRM |  |  | 10 | µA | VDRM=VRRM, Tj=25℃ | 3 |
| Off-state/reverse leakage current | IDRM/IRRM |  |  | 3 | mA | VDRM=VRRM, Tj=125℃ | 3 |
| Gate non-trigger voltage | VGD | 0.2 |  |  | V | VD=VDRM, Tj=125℃, RL=3.3kΩ | 2 |
| Storage junction temperature range | Tstg | -40 |  | 150 | ℃ |  | 1 |
| Operating junction temperature range | Tj | -40 |  | 125 | ℃ |  | 1 |
| RMS on-state current | IT(RMS) |  |  | 25 | A |  | 1 |
| Non repetitive surge peak on-state current | ITSM |  |  | 250 | A | full cycle, F=50Hz | 1 |
| I2t value for fusing | I2t |  |  | 340 | A2s | tp=10ms | 1 |
| Critical rate of rise of on-state current | dI/dt |  |  | 50 | A/μs | IG=2×IGT | 1 |
| Peak gate current | IGM |  |  | 4 | A |  | 2 |
| Average gate power dissipation | PG(AV) |  |  | 1 | W |  | 2 |
| Peak gate power | PGM |  |  | 10 | W |  | 2 |
| Thermal resistance junction to case (AC), TO-220A (Ins) | Rth(j-c) |  |  | 1.5 | ℃/W | junction to case(AC), TO-220A(Ins) | 3 |

## CAD (KiCad official)

- Symbol: `BTA26`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `bta26-etched.step` / `bta26-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bta26.step` / `bta26.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WEIDA datasheet](docs/bta26-datasheet.pdf) (8 pp, sha256 `ca8b081d3f037dec`, retrieved 2026-10-27, 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/bta26-datasheet.pdf)