# UESD3.3DT5G

**onsemi** · ESD And Surge Protection (TVS/ESD) · SOT-723

UESD3.3DT5G from onsemi, in a SOT-723. 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 | CATHODE | passive | Cathode terminal of the ESD protection diode; the datasheet gives no separate electrical limit for this pin beyond the device maximum ratings (ESD ±30 kV IEC 61000-4-2 contact/air, 16 kV HBM, 400 V MM, 40 A IEC 61000-4-4). |
| 2 | CATHODE | passive | Second cathode terminal of the ESD protection diode, connected internally with pin 1 as stated in the pin assignment; no separate limit is given for this pin. |
| 3 | ANODE | passive | Anode terminal of the ESD protection diode, which clamps ESD transients to the cathode pins; the datasheet gives no separate electrical limit for this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-723 |
| Category | Circuit Protection |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `UESD3.3DT5G`
- Footprint: `Package_TO_SOT_SMD:SOT-723`
- 3D model: SOT-723, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.5 mm nominal SOT-723 height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `uesd3-3dt5g-etched.step` / `uesd3-3dt5g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uesd3-3dt5g.step` / `uesd3-3dt5g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588910835430772736) (4 pp, sha256 `fa8eaf1c1a7d2fc6`, 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/uesd3-3dt5g-datasheet.pdf)