Txs0104 - Hardware details

Pinout

Logic Level Converter I2C TXS0104 pinout diagram

Click here for a high-resolution image of the pinout.

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Pin Details

Pin Marking	Pin Name	Description
GND	Ground	Common ground for both high and low voltage sides.
VCCH	High Voltage Power	Supply voltage for the high-voltage side (typically 5V).
VCCL	Low Voltage Power	Supply voltage for the low-voltage side (typically 3.3V).
B1 - B4	High Voltage Pins	High-voltage side signal pins (typically 5V logic).
A1 - A4	Low Voltage Pins	Low-voltage side signal pins (typically 3.3V logic).
OE	Output Enable Pin	Enables or disables output, switching between active (HIGH/LOW) and high-impedance (Hi-Z) states.

ℹ️

• VCCH: 2.3V - 5V
• VCCL: 1.65V - 3.6V

⚠️

VCCL must be lower than VCCH!

⚠️

Ensure that GND is connected to both the high and low voltage grounds to establish a common reference for signals.

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Dimensions

• Board Dimensions: 22 × 22 mm (0.9 × 0.9 inch)
• Header Pin Holes: 1.5 mm
• Screw Holes: Designed for M3 screws (3.2 mm diameter)
• Soldered boards are LEGO-compatible! 🧱

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Hardware repository

Schematics, KiCad files, Gerber files and more can be found in the GitHub repository:

Logic Level Converter I2C TXS0104 board Hardware design

GitHub hardware repository for this product

The hardware repository contains everything you need to understand, modify, or manufacture the board. The different output folders are versioned. You can check which board version you have specifically by finding the version mark on the PCB.

Below is an overview of the available files.

CAD files

We use KiCad, an open-source PCB design tool. You can open and edit the .kicad_pro project file, which includes both the schematic and PCB layout.

The PANEL files are used internally for production.

Schematic

The OUTPUTS folder contains the schematic in .pdf format, exported from KiCad.

BOM (Bill of Materials)

The bill of materials (BOM) is provided in two formats:

• A standard .csv table, listing all components, part numbers, and values.
• An interactive BOM (.html) that visually highlights each component on the PCB, making it easy to locate and reference parts.

3D files

A 3D model of the PCB is available in .step format, allowing you to inspect the board design in CAD software.

Gerber files

Gerber files are essential for PCB manufacturing, as they contain precise instructions for each layer of the board. The repository includes standard Gerber outputs in a .zip file, such as:

• Copper layers (.Cu.gbr) – Defines the traces and pads on the board.
• Solder mask layers (.Mask.gbr) – Specifies the protective solder mask.
• Silkscreen layers (.Silkscreen.gbr) – Contains text and component markings.
• Paste layers (.Paste.gbr) – Used for stencil fabrication in SMD assembly.
• Drill files (.drl) – Provides drilling coordinates for vias and holes.
• Board outline (.Edge_Cuts.gbr) – Defines the shape of the PCB.
• Gerber job file (.gbrjob) – Describes the set of Gerber files used for production.

These files are ready for fabrication and can be used in PCB manufacturing.

Compliance

The Compliance section includes important regulatory and safety documentation for this product. These files ensure compliance with relevant industry standards and legal requirements.

• CE – Certification document confirming compliance with EU safety, health, and environmental requirements.
• UKCA – UKCA (UK Conformity Assessed) certification for the UK market.
• Safety Instructions – Safety guidelines and precautions in English and in German.
• Info.txt – Contains product details such as SKU, country of origin, HS tariff code, and barcode.