● Community Submission — This content is pending review by the Adom team. v2.0.0
Molecule

PCA9306 Level Shifter Molecule

Bidirectional 2-channel I2C/SMBus voltage-level translator molecule (TI PCA9306DCUR) ā€” 1.8 V <-> 3.3 V, no one-shot ACK contention, 24x16 mm 4-pin Adom workcell molecule with 8 medium machine contacts. Built with tscircuit + adom-tsci.

Photo
Creator Drew Owens
Tools tscircuitadom-tsci
Version 2.0.0
Assets 1 files
šŸ’¬ Sample prompts Paste any of these into Claude Code to use this molecule
I2C 1.8V to 3.3V Show me a 1.8V to 3.3V I2C level shifter molecule
PCA9306 breakout Open the PCA9306 level shifter molecule
Replace TXS0108E What molecule replaces a TXS0108E without the one-shot ACK contention?
Order from JLC I want to order the PCA9306 level shifter molecule from JLC
Show the 3D viewer Open the live 3D viewer for the PCA9306 level shifter
āš” Install this molecule

Paste this into Claude Code (VS Code panel, Adom editor, or terminal) to install:

Search the Adom Wiki for the molecule "PCA9306 Level Shifter Molecule" (slug: pca9306-level-shifter) at https://wiki-ufypy5dpx93o.adom.cloud/wiki/molecules/pca9306-level-shifter. Download its symbol (.kicad_sym), footprint (.kicad_mod), and 3D model (.glb/.step) assets into my current KiCad project under symbols/, footprints/, and 3dmodels/ directories. Register them in the project library tables. Show me the files once installed.

PCA9306 Level Shifter Molecule ā€” Plan

Brief

Drop-in IĀ²C / SMBus voltage-level translator molecule for Adom workcells. Bridges a 1.8 V bus to a 3.3 V (or up to 5 V) bus with no direction pin and no one-shot accelerator contention ā€” the canonical replacement for the TXS0108E on the Bosch sensortec arm board, where the TXS family's one-shot rising-edge accelerator fights IĀ²C slave open-drain ACK pull-down and produces address-NACK at probe time.

Decisions

  • Tool: adom-tsci / tscircuit (canonical Adom path).
  • Size: 24x16 ā€” 4-pin molecule. Wider than tall so 4 + 4 perimeter contacts fit comfortably.
  • Pin grid: medium machine pins (4 corner pins + 4 edge contacts per long side).
  • IC: TI PCA9306DCUR in VSSOP-8 (DCU package). LCSC C58662 (JLC extended).
  • EN handling: internally tied to VREF2 via a 10 kĪ© pull-up (always-enabled by default). Cut the R5 trace if external EN control is needed later.
  • Pull-ups: 4.7 kĪ© on SDA1, SCL1 ā†’ VREF1; 4.7 kĪ© on SDA2, SCL2 ā†’ VREF2. UNI-ROYAL 0402 (LCSC C25900 ā€” JLC basic).
  • Decoupling: one 100 nF 0402 X7R on each VREF rail, placed within 1 mm of the IC pin. Samsung CL05B104KO5NNNC (LCSC C1525 ā€” JLC basic).
  • Top silkscreen: "PCA9306", function tag, pin labels on every contact.
  • Bottom silkscreen: part name, "1.8V <-> 3.3V I2C", version + author + date.

Components

RefValuePackageMPNLCSC
U1PCA9306DCURVSSOP-8PCA9306DCURC58662
C1, C2100 nF 25 V X7R0402CL05B104KO5NNNCC1525
R1..R44.7 kĪ© 1 %04020402WGF4701TCEC25900
R510 kĪ© 1 %04020402WGF1002TCEC25744

Workcell interface (8 medium machine contacts)

PinNetSideNotes
MC_VREF1VREF1left (LV)1.71ā€“1.89 V supply
MC_SDA1SDA1left1.8 V SDA, 4.7 kĪ© to VREF1
MC_SCL1SCL1left1.8 V SCL, 4.7 kĪ© to VREF1
MC_GND1GNDleftshared ground
MC_VREF2VREF2right (HV)3.3 V supply
MC_SDA2SDA2right3.3 V SDA, 4.7 kĪ© to VREF2
MC_SCL2SCL2right3.3 V SCL, 4.7 kĪ© to VREF2
MC_GND2GNDrightshared ground

Don'ts

  • No BGA / 0201.
  • No external EN pin.
  • Only one JLC extended part (U1 itself); everything else basic-tier.

Publish

cd ~/project/adom-tsci-projects/pca9306-level-shifter
bun install
bunx tsci build lib/index.tsx --glbs --svgs --3d-png --pcb-png
adom-tsci start .
adom-tsci export-wiki --slug pca9306-level-shifter --page-type molecules

Source files

MD plan.md
Original design brief / plan for pca9306-level-shifter ā€” the prompt the project was authored from.
 file 2.5 KB
GLB 3d.glb
Full 3D model ā€” opens in any glTF viewer
 glb 894.1 KB
PNG 3d.png
Top-down 3D render
 screenshot 40.5 KB
PNG pcb.png
PCB layout ā€” copper, silkscreen, drill
 screenshot 78.0 KB
SVG pcb.svg
PCB layout (vector SVG)
 file 93.6 KB
SVG schematic.svg
Circuit schematic
 file 126.7 KB
GZ pca9306-level-shifter-source.tar.gz
Source for pca9306-level-shifter ā€” full tscircuit project (lib/, package.json, walkthrough.json, plan.md if present). Untar and `bun install && bunx tsci build` to recreate.
 file 4.9 KB

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0 revisions · Molecule # · Updated 2026-05-26 14:37:09

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