# TISP61089BDR-S

**BOURNS** · ESD And Surge Protection (TVS/ESD) · SO-8

TISP61089BDR-S from BOURNS, in a SO-8. 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 | K1 | passive | Thyristor cathode K1 (Tip) of the SCR/diode pair; connects to the line Tip conductor and is clipped to the gate-referenced negative supply voltage. |
| 2 | G | input | Gate terminal connected to the SLIC negative supply VBATH (with a 220 nF decoupling capacitor) to set the negative protection voltage, supporting battery voltages down to -155 V. |
| 3 | NC | unconnected | No internal connection. |
| 4 | K2 | passive | Thyristor cathode K2 (Ring) of the SCR/diode pair; connects to the line Ring conductor and is clipped to the gate-referenced negative supply voltage. |
| 5 | K2 | passive | Thyristor cathode K2 (Ring), internally the same node as pin 4; connects to the line Ring conductor. |
| 6 | A | power_in | Anode (Ground) common to both protector elements; positive overvoltages are clipped to ground through diode forward conduction. |
| 7 | A | power_in | Anode (Ground) common to both protector elements, internally the same node as pin 6. |
| 8 | K1 | passive | Thyristor cathode K1 (Tip), internally the same node as pin 1; connects to the line Tip conductor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BOURNS |
| Package | SO-8 |
| Category | Circuit Protection |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `TISP61089BDR-S`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `tisp61089bdr-s-etched.step` / `tisp61089bdr-s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tisp61089bdr-s.step` / `tisp61089bdr-s.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BOURNS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588886921237958656) (21 pp, sha256 `2fa43e897ce12f47`, retrieved 2026-10-09, 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/tisp61089bdr-s-datasheet.pdf)