# WIZnet Ethernet HAT (W5100S) for Raspberry Pi Pico: 68 × 21 mm board and RJ45 jack position

> What are the WIZnet Ethernet HAT dimensions and where is the RJ45 jack?

- Category: Electronic components › Modules, sensors & displays
- Kind: Modern device
- Basis: WIZnet Ethernet HAT V1.0.0 Gerber files and the UDE RB1-125BAG1A RJ45 datasheet.
- Page: https://xemstudio.com/objects/wiznet-ethernet-hat-w5100s/ · JSON: https://xemstudio.com/api/geometry?object=wiznet-ethernet-hat-w5100s · Plain text: https://xemstudio.com/objects/wiznet-ethernet-hat-w5100s/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 72.9 | 21.0 | 14.35 |

**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- Datum: board centred on X and Y, bottom on z=0, components on top; −X is the RJ45 end.
- Board 68.0 × 21.0 × 1.0 mm, square corners, no mounting holes (it stacks on the Pico via two 1×20 2.54 mm headers along the ±Y edges).
- RJ45 jack 21.79 × 15.75, x −38.9..−17.11, centred in Y, top 13.35 above the board; its front face overhangs the −X board edge by 4.9.
- Overall 72.9 long including the RJ45 overhang, 14.35 high.
- Not modelled: the headers, W5100S IC and passives. Exact nominal mm.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| RJ45 jack | 15.75 wide × 13.35 above board, face 4.9 past −X edge | RJ45 panel cutout / Ethernet plug | designed | all |
| Pico headers | 2 × 1×20, 2.54 pitch along ±Y edges | Raspberry Pi Pico pins | socket | all |

## Where the files are

- WIZnet: [WIZnet Ethernet HAT documentation](https://docs.wiznet.io/Product/Open-Source-Hardware/wiznet_ethernet_hat) — web — Publisher's page; dimensions are facts
- UDE / Chipsmall: [RB1-125BAG1A RJ45 datasheet](https://datasheet.chipsmall.com/RB1-125BAG1A/329978.pdf) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/wiznet-ethernet-hat-w5100s/index.json

- wiznet-ethernet-hat-w5100s: [STEP](https://xemstudio.com/files/hardware/wiznet-ethernet-hat-w5100s/wiznet-ethernet-hat-w5100s.step) · [STL](https://xemstudio.com/files/hardware/wiznet-ethernet-hat-w5100s/wiznet-ethernet-hat-w5100s.stl) — WIZnet Ethernet HAT (W5100S) for Raspberry Pi Pico: 68 × 21 mm board and RJ45 jack position

## Questions

**How big is the WIZnet Ethernet HAT?**

68.0 × 21.0 mm board; 72.9 mm long and 14.35 mm high including the RJ45 jack.

**How far does the RJ45 stick out?**

Its front face is 4.9 mm past the board edge; the jack is 15.75 mm wide and 13.35 mm above the board.

## Fits with

- [Raspberry Pi Pico](https://xemstudio.com/objects/raspberry-pi-pico/)
- [Raspberry Pi Pico 2](https://xemstudio.com/objects/raspberry-pi-pico-2/)
- [Micro-USB (Molex 47346) and Mini-USB (Lumberg 2486) receptacles](https://xemstudio.com/objects/micro-usb-mini-usb-receptacles/)
- [2.54 mm pin headers, 1×2 to 2×20, vertical and right-angle](https://xemstudio.com/objects/pin-headers-2.54mm/)
- [Adafruit PiCowbell boards and Pico cases](https://xemstudio.com/objects/adafruit-picowbell-pico-accessories/)