# TF2123G-E5-AQ3-R

**UTC Unisonic Tech** · JFETs · SOT-723

TF2123G-E5-AQ3-R from UTC Unisonic Tech, 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 | S | passive | Source terminal; typically connected to ground or bias return; provides return path for drain current. |
| 2 | D | output | Drain terminal connected to load resistor and power supply; maximum drain current 10 mA; output signal is extracted from this node. |
| 3 | G | input | Gate input terminal for signal control; gate-source cutoff voltage VGS(OFF) is -0.38 V maximum; gate-drain voltage must not exceed -20 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-723 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `TF2123G-E5-AQ3-R`
- 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: `tf2123g-e5-aq3-r-etched.step` / `tf2123g-e5-aq3-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tf2123g-e5-aq3-r.step` / `tf2123g-e5-aq3-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC Unisonic Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586203135669121024) (4 pp, sha256 `eae046d5ee04c7f4`, retrieved 2026-10-01, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/tf2123g-e5-aq3-r-datasheet.pdf)