# BT139B-800G-JSM

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

BT139B-800G-JSM from JSMSEMI, 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 | T1 | passive | Main terminal T1 (MT1) of the triac, shown as T1(1) in the package diagram. |
| 2 | T2 | passive | Main terminal T2 (MT2) of the triac, shown as T2(2); also connected to the tab, with repetitive peak off-state voltage VDRM/VRRM of 800 V and RMS on-state current of 16 A. |
| 3 | G | input | Gate terminal G(3); gate trigger current max 50 mA (quadrants I-III) and 100 mA (quadrant IV) at VD=12 V, IT=0.1 A, with gate trigger voltage max 1.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| 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 |  | 1 |
| RMS on-state current (full sine wave) | IT(RMS) |  |  | 16 | A |  | 1 |
| Non-repetitive peak on-state current | ITSM |  |  | 160 | A | tp=20ms | 1 |
| Peak gate power dissipation | PGM |  |  | 5 | W |  | 1 |
| Average gate power dissipation | PG(AV) |  |  | 0.5 | W |  | 1 |
| Operating junction temperature | Tj |  |  | 125 | ℃ |  | 1 |
| Storage temperature | Tstg | -40 |  | 150 | ℃ |  | 1 |
| Repetitive peak reverse current | IRRM |  |  | 0.02 | mA | VR=VRRM | 1 |
| Repetitive peak reverse current | IRRM |  |  | 0.5 | mA | VR=VRRM, Tj=125℃ | 1 |
| Repetitive peak off-state current | IDRM |  |  | 0.02 | mA | VD=VDRM | 1 |
| Repetitive peak off-state current | IDRM |  |  | 0.5 | mA | VD=VDRM, Tj=125℃ | 1 |
| Gate trigger current, quadrant I | IGT |  |  | 50 | mA | VD=12V; IT=0.1A | 1 |
| Gate trigger current, quadrant II | IGT |  |  | 50 | mA | VD=12V; IT=0.1A | 1 |
| Gate trigger current, quadrant III | IGT |  |  | 50 | mA | VD=12V; IT=0.1A | 1 |
| Gate trigger current, quadrant IV | IGT |  |  | 100 | mA | VD=12V; IT=0.1A | 1 |
| Gate trigger voltage | GT |  |  | 1.5 | V | VD=12V; IT=0.1A | 1 |
| On-state voltage | VTM |  |  | 1.6 | V | IT=20A | 1 |
| Holding current | IH |  |  | 30 | mA | IGT=0.1A, VD=12V | 1 |

## CAD (KiCad official)

- Symbol: `BT139B-800G-JSM`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263 (KiCad packages3D, STEP)
- 3D model files: `bt139b-800g-jsm-etched.step` / `bt139b-800g-jsm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bt139b-800g-jsm.step` / `bt139b-800g-jsm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JSMSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590909171631923200) (2 pp, sha256 `5377ff7db576fdc0`, 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/bt139b-800g-jsm-datasheet.pdf)