# TPS25821DSST

**Texas Instruments** · Interface - Specialized · WSON-12-EP(2x3)

TPS25821DSST from Texas Instruments, in a WSON-12-EP(2x3). 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 | IN | power_in | Device input supply for the VBUS internal power switch; on the TPS25820 this pin also supplies the VCONN internal power switch, which the TPS25821 does not have. |
| 2 | IN | power_in | Device input supply for the VBUS internal power switch; on the TPS25820 this pin also supplies the VCONN internal power switch, which the TPS25821 does not have. |
| 3 | CHG | input | Charge logic input that selects between standard USB and 1.5-A Type-C current sourcing ability. |
| 4 | EN | input | Logic input that turns the device on and off. |
| 5 | FAULT | output | Open-drain logic output that asserts when the device is in overtemperature and/or VBUS is in current limit. |
| 6 | SINK | output | Open-drain logic output that asserts when a Type-C Sink is identified on the CC lines. |
| 7 | POL | output | Open-drain logic output that asserts when the CC2 pin is connected to the cable CC line, giving the information needed to mux the super speed lines. |
| 8 | REF | input | Analog input used to set the current reference; connect a 0.5%, 100-ppm, 100-kΩ resistor between this pin and GND. |
| 9 | CC1 | bidirectional | Analog input/output that connects to the Type-C receptacle CC1 pin. |
| 10 | GND | power_in | Ground. |
| 11 | CC2 | bidirectional | Analog input/output that connects to the Type-C receptacle CC2 pin. |
| 12 | OUT | power_out | VBUS power switch output. |
| 13 | Thermal Pad | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WSON-12-EP(2x3) |
| Category | Interface |
| Pins | 13 |

## CAD (KiCad official)

- Symbol: `TPS25821DSST`
- Footprint: `Package_SON:WSON-12-1EP_3x2mm_P0.5mm_EP1x2.65`
- 3D model: WSON-12-EP(2x3), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.75 mm nominal WSON 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: `tps25821dsst-etched.step` / `tps25821dsst-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps25821dsst.step` / `tps25821dsst.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/tps25821) (35 pp, sha256 `d6bec2609091145a`, retrieved 2026-10-08, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/tps25821dsst-datasheet.pdf)