# DALC112S1RL

**STMicroelectronics** · ESD And Surge Protection (TVS/ESD) · SOIC-8

DALC112S1RL from STMicroelectronics, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | I/O 5 | bidirectional | Signal line 5 protected by diode clamping pair to reference voltages with VRRM = 18V per diode and capacitance < 5pF. |
| 2 | I/O 6 | bidirectional | Signal line 6 protected by diode clamping pair to reference voltages with VRRM = 18V per diode and capacitance < 5pF. |
| 3 | I/O 1 | bidirectional | Signal line 1 protected by diode clamping pair to reference voltages with VRRM = 18V per diode and capacitance < 5pF. |
| 4 | I/O 2 | bidirectional | Signal line 2 protected by diode clamping pair to reference voltages with VRRM = 18V per diode and capacitance < 5pF. |
| 5 | I/O 3 | bidirectional | Signal line 3 protected by diode clamping pair to reference voltages with VRRM = 18V per diode and capacitance < 5pF. |
| 6 | I/O 4 | bidirectional | Signal line 4 protected by diode clamping pair to reference voltages with VRRM = 18V per diode and capacitance < 5pF. |
| 7 | REF 1 | power_in | Positive supply voltage reference connection for diode clamping, +VCC connected between REF1 and REF2. |
| 8 | REF 2 | power_in | Ground/negative supply reference connection for diode clamping, +VCC connected between REF1 and REF2. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOIC-8 |
| Category | Circuit Protection |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `DALC112S1RL`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `dalc112s1rl-etched.step` / `dalc112s1rl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dalc112s1rl.step` / `dalc112s1rl.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588939165002448896) (3 pp, sha256 `a7e89c8091e633cb`, retrieved 2026-09-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/dalc112s1rl-datasheet.pdf)