# TCA4307DGKR

**Texas Instruments** · Signal Buffers, Repeaters, Splitters · MSOP-8

TCA4307DGKR from Texas Instruments, in a MSOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | EN | input | Active-high chip enable. When low, the device enters low-current mode, disables rise-time accelerators and pre-charge, drives READY low, and isolates SDAIN/SCLIN from SDAOUT/SCLOUT. Tie to VCC for normal operation if not used. VIH >= 0.7*VCC, VIL <= 0.3*VCC. |
| 2 | SCLOUT | bidirectional | Serial clock output to the card-side I2C bus. Open-drain, requires a pull-up resistor. Isolated from SCLIN until EN is high and start-up is complete. |
| 3 | SCLIN | bidirectional | Serial clock input from the backplane-side I2C bus. Open-drain, requires a pull-up resistor. Pre-charged to 1 V during insertion to minimize glitching. |
| 4 | GND | power_in | Device ground reference. |
| 5 | READY | output | Open-drain connection flag / rise-time accelerator control. Low when EN is low or during start-up; goes high when EN is high, start-up is complete, and the two bus sides are connected. Connect a ~10 kOhm pull-up to VCC. IOL = 3 mA, VOL <= 0.4 V. |
| 6 | SDAIN | bidirectional | Serial data input from the backplane-side I2C bus. Open-drain, requires a pull-up resistor. Pre-charged to 1 V during live insertion. |
| 7 | SDAOUT | bidirectional | Serial data output to the card-side I2C bus. Open-drain, requires a pull-up resistor. Isolated from SDAIN until EN is high and start-up is complete. |
| 8 | VCC | power_in | Main input supply from the backplane, 2.3 V to 5.5 V. Sets the supply voltage for the backplane-side I2C devices and the internal pull-ups from SDAOUT/SCLOUT. Place a 0.1 uF bypass capacitor close to this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | MSOP-8 |
| Category | Comm/UART |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `TCA4307DGKR`
- `TCA4307DGKRDGKT`
- `TCA4307DGKRDRGR`
- `TCA4307DGKRDRGT`

## CAD (KiCad official)

- Symbol: `TCA4307DGKR`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `tca4307dgkr-etched.step` / `tca4307dgkr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tca4307dgkr.step` / `tca4307dgkr.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/lit/ds/symlink/tca4307.pdf) (29 pp, sha256 `904278fd916371ef`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tca4307dgkr-datasheet.pdf)