# TS3USBCA420RSVR

**Texas Instruments** · Analog Switches / Multiplexers · UQFN-16(1.8x2.6)

TS3USBCA420RSVR from Texas Instruments, in a UQFN-16(1.8x2.6). 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 | VCC | power_in | Power supply for the device, which operates from 2.4 V to 5.5 V (5.0 V nominal) and requires external decoupling capacitors close to this pin. |
| 2 | MIC_GND1/Ln1 | bidirectional | Analog audio MIC/AGND signal connection to the audio codec, which can also be used as a general-purpose I/O. |
| 3 | MIC_GND2/Ln2 | bidirectional | Analog audio MIC/AGND signal connection to the audio codec, which can also be used as a general-purpose I/O. |
| 4 | OEn | input | Active-low output enable: L selects normal operation, while H enters standby with I2C registers reset (default); it has an internal weak pull-up. |
| 5 | SEL1/SCL | input | In pin-configuration mode (I2C_EN = L) it is SEL1 for switch selection; in I2C mode it is SCL, which needs a pull-up to VI2C through 0.62 kΩ to 2.2 kΩ; failsafe input with internal weak pull-down. |
| 6 | SEL0/SDA | bidirectional | In pin-configuration mode (I2C_EN = L) it is SEL0 for switch selection; in I2C mode it is SDA, which needs a pull-up to VI2C through 0.62 kΩ to 2.2 kΩ; failsafe I/O with internal weak pull-down. |
| 7 | LnBp | bidirectional | Single-ended I/O or positive-polarity differential partner to LnBn for generic signals such as DisplayPort AUX, PCIe clock, I2C, UART, and debug. |
| 8 | LnBn | bidirectional | Single-ended I/O or negative-polarity differential partner to LnBp for generic signals such as DisplayPort AUX, PCIe clock, I2C, UART, and debug. |
| 9 | GND | power_in | Primary ground connection that must be connected to system ground. |
| 10 | SBU2 | bidirectional | Must be DC coupled to the Type-C receptacle SBU2 pin; failsafe I/O with an internal nominal 1.6 MΩ pull-down. |
| 11 | SBU1 | bidirectional | Must be DC coupled to the Type-C receptacle SBU1 pin; failsafe I/O with an internal nominal 1.6 MΩ pull-down. |
| 12 | I2C_EN | input | 3-level input that selects pin-configuration mode (L, tied to GND or floating), I2C mode with ADDR0 (M, tied to VCC/2), or I2C mode with ADDR1 (H, tied to VCC); it has an internal weak pull-down. |
| 13 | LnCn | bidirectional | Single-ended I/O or negative-polarity differential partner to LnCp for generic signals such as DisplayPort AUX, PCIe clock, I2C, UART, and debug. |
| 14 | LnCp | bidirectional | Single-ended I/O or positive-polarity differential partner to LnCn for generic signals such as DisplayPort AUX, PCIe clock, I2C, UART, and debug. |
| 15 | LnAn | bidirectional | Single-ended I/O or negative-polarity differential partner to LnAp; preferred for DisplayPort AUX and also usable for PCIe clock, I2C, UART, and debug. |
| 16 | LnAp | bidirectional | Single-ended I/O or positive-polarity differential partner to LnAn; preferred for DisplayPort AUX and also usable for PCIe clock, I2C, UART, and debug. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | UQFN-16(1.8x2.6) |
| Category | Communication Interface Chip/UART/485/232 |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `TS3USBCA420RSVR`
- Footprint: `Package_DFN_QFN:UQFN-16_1.8x2.6mm_P0.4mm`
- 3D model: UQFN-16(1.8x2.6), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.55 mm nominal UFQFPN 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: `ts3usbca420rsvr-etched.step` / `ts3usbca420rsvr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ts3usbca420rsvr.step` / `ts3usbca420rsvr.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/ts3usbca4) (45 pp, sha256 `28ce8be13d774aa3`, 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/ts3usbca420rsvr-datasheet.pdf)