# TPS23881RTQR

**Texas Instruments** · Ethernet Transceivers · QFN-56-EP(8x8)

TPS23881RTQR from Texas Instruments, in a QFN-56-EP(8x8). 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 | GAT1 | output | Channel 1 gate drive output to the external N-channel MOSFET; leave floating if unused. |
| 2 | SEN1 | input | Channel 1 current-sense input referenced to KSENSA via the 0.200Ω sense resistor; connect to GND if the channel is unused. |
| 3 | DRAIN1 | input | Channel 1 output voltage monitor and detection sense; may be floated or grounded if unused. |
| 4 | KSENSA | input | Kelvin point connection for SEN1 and SEN2. |
| 5 | DRAIN2 | input | Channel 2 output voltage monitor and detection sense; may be floated or grounded if unused. |
| 6 | SEN2 | input | Channel 2 current-sense input referenced to KSENSA via the 0.200Ω sense resistor; connect to GND if the channel is unused. |
| 7 | GAT2 | output | Channel 2 gate drive output to the external N-channel MOSFET; leave floating if unused. |
| 8 | GAT3 | output | Channel 3 gate drive output to the external N-channel MOSFET; leave floating if unused. |
| 9 | SEN3 | input | Channel 3 current-sense input referenced to KSENSB via the 0.200Ω sense resistor; connect to GND if the channel is unused. |
| 10 | DRAIN3 | input | Channel 3 output voltage monitor and detection sense; may be floated or grounded if unused. |
| 11 | KSENSB | input | Kelvin point connection for SEN3 and SEN4. |
| 12 | DRAIN4 | input | Channel 4 output voltage monitor and detection sense; may be floated or grounded if unused. |
| 13 | SEN4 | input | Channel 4 current-sense input referenced to KSENSB via the 0.200Ω sense resistor; connect to GND if the channel is unused. |
| 14 | GAT4 | output | Channel 4 gate drive output to the external N-channel MOSFET; leave floating if unused. |
| 15 | NC | unconnected | No connect; internally biased at 1/3 or 2/3 of VPWR to grade the VPWR voltage gradient, keep open. |
| 16 | NC | unconnected | No connect; internally biased at 1/3 or 2/3 of VPWR to grade the VPWR voltage gradient, keep open. |
| 17 | VPWR | power_in | Analog 54V positive supply (44V to 57V recommended, 70V absolute max), bypassed with 0.1µF to AGND. |
| 18 | NC | unconnected | No connect; internally biased at 1/3 or 2/3 of VPWR to grade the VPWR voltage gradient, keep open. |
| 19 | NC | unconnected | No connect; internally biased at 1/3 or 2/3 of VPWR to grade the VPWR voltage gradient, keep open. |
| 20 | TEST4 | bidirectional | Internal test pin used for test purposes only; keep open. |
| 21 | AGND | power_in | Analog ground; connect to the GND plane and exposed thermal pad. |
| 22 | NC | unconnected | No connect; keep open. |
| 23 | TEST1 | bidirectional | Internal test pin used for test purposes only (internal 50kΩ typical pull-down); keep open. |
| 24 | TEST2 | bidirectional | Internal test pin used for test purposes only (internal 50kΩ typical pull-down); keep open. |
| 25 | TEST3 | bidirectional | Internal test pin used for test purposes only; keep open. |
| 26 | TEST0 | bidirectional | Internal test pin used for test purposes only (internal 50kΩ typical pull-up); keep open. |
| 27 | NC | unconnected | No connect; keep open. |
| 28 | NC | unconnected | No connect; keep open. |
| 29 | GAT5 | output | Channel 5 gate drive output to the external N-channel MOSFET; leave floating if unused. |
| 30 | SEN5 | input | Channel 5 current-sense input referenced to KSENSC via the 0.200Ω sense resistor; connect to GND if the channel is unused. |
| 31 | DRAIN5 | input | Channel 5 output voltage monitor and detection sense; may be floated or grounded if unused. |
| 32 | KSENSC | input | Kelvin point connection for SEN5 and SEN6. |
| 33 | DRAIN6 | input | Channel 6 output voltage monitor and detection sense; may be floated or grounded if unused. |
| 34 | SEN6 | input | Channel 6 current-sense input referenced to KSENSC via the 0.200Ω sense resistor; connect to GND if the channel is unused. |
| 35 | GAT6 | output | Channel 6 gate drive output to the external N-channel MOSFET; leave floating if unused. |
| 36 | GAT7 | output | Channel 7 gate drive output to the external N-channel MOSFET; leave floating if unused. |
| 37 | SEN7 | input | Channel 7 current-sense input referenced to KSENSD via the 0.200Ω sense resistor; connect to GND if the channel is unused. |
| 38 | DRAIN7 | input | Channel 7 output voltage monitor and detection sense; may be floated or grounded if unused. |
| 39 | KSENSD | input | Kelvin point connection for SEN7 and SEN8. |
| 40 | DRAIN8 | input | Channel 8 output voltage monitor and detection sense; may be floated or grounded if unused. |
| 41 | SEN8 | input | Channel 8 current-sense input referenced to KSENSD via the 0.200Ω sense resistor; connect to GND if the channel is unused. |
| 42 | GAT8 | output | Channel 8 gate drive output to the external N-channel MOSFET; leave floating if unused. |
| 43 | VDD | power_in | 3.3V digital logic supply (3V to 3.6V recommended), bypassed with 0.1µF to DGND. |
| 44 | RESET | input | Active-low reset input that resets the device; internally pulled up to VDD. |
| 45 | INT | output | Open-drain interrupt output, pulled low when a bit in the interrupt register is set. |
| 46 | DGND | power_in | Digital ground; connect to the GND plane and exposed thermal pad. |
| 47 | TEST5 | bidirectional | Internal test pin used for test purposes only; keep open. |
| 48 | A1 | input | I2C address line A1, internally pulled up to VDD. |
| 49 | A2 | input | I2C address line A2, internally pulled up to VDD. |
| 50 | A3 | input | I2C address line A3, internally pulled up to VDD. |
| 51 | A4 | input | I2C address line A4, internally pulled up to VDD. |
| 52 | AUTO | bidirectional | Autonomous mode enable and selection pin: floating disables autonomous mode, RAUTO to GND selects the port power allocation, with a 10nF capacitor required when RAUTO is used. |
| 53 | SCL | input | Serial clock input for the I2C bus. |
| 54 | SDAI | input | Serial data input for the I2C bus; can be tied to SDAO in non-isolated systems. |
| 55 | SDAO | output | Open-drain I2C serial data output requiring an external pull-up; can be tied to SDAI in non-isolated systems. |
| 56 | OSS | input | Active-high fast shutdown input for channels 1-8, internally pulled down to DGND with a 1µs to 5µs deglitch filter. |
| 57 | EP | power_in | Exposed thermal pad; DGND and AGND must be connected to it for proper operation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | QFN-56-EP(8x8) |
| Category | Interface |
| Pins | 57 |

## CAD (KiCad official)

- Symbol: `TPS23881RTQR`
- Footprint: `Package_DFN_QFN:QFN-56-1EP_8x8mm_P0.5mm_EP4.5x5.2mm`
- 3D model: QFN-56-EP(8x8) (KiCad packages3D, STEP)
- 3D model files: `tps23881rtqr-etched.step` / `tps23881rtqr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps23881rtqr.step` / `tps23881rtqr.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/tps23881) (133 pp, sha256 `e4f4fdd814bbae94`, retrieved 2026-10-01, 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-4-5-20251001` (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/tps23881rtqr-datasheet.pdf)