# SI3865DDV

**TECH PUBLIC** · Power Distribution Switches · SOT23-6L

SI3865DDV from TECH PUBLIC, in a SOT23-6L. 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 | R2 | passive | Source of the Q1 level-shift MOSFET, returned to GND directly or through the optional slew-rate-control resistor R2 (typical 0 to 50kΩ). |
| 2 | D2 | power_out | Drain of P-channel switch Q2 (VOUT load output, tied to pin 3), rated 2.8A continuous and 6A pulsed load current. |
| 3 | D2 | power_out | Drain of P-channel switch Q2 (VOUT load output, tied to pin 2), rated 2.8A continuous and 6A pulsed load current. |
| 4 | S2 | power_in | Source of P-channel switch Q2 and the VIN input, operating range 1.5V to 12V. |
| 5 | ON/OFF | input | Logic-level control input to the gate of Q1 with 2000V HBM ESD protection, 1.8V to 8V logic level, absolute maximum 8V. |
| 6 | R1, C1 | passive | Gate node of Q2 and drain of Q1, where pull-up resistor R1 (typical 20kΩ to 1MΩ) to VIN and optional slew-rate capacitor C1 (typical 1000pF) connect. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TECH PUBLIC |
| Package | SOT23-6L |
| Category | Power Management (PMIC) |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `SI3865DDV`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT23-6L (KiCad packages3D, STEP)
- 3D model files: `si3865ddv-etched.step` / `si3865ddv-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `si3865ddv.step` / `si3865ddv.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TECH PUBLIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603149700942356480) (7 pp, sha256 `6ad64a48c5520c3c`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/si3865ddv-datasheet.pdf)