Circuit Issues
Templates
#0115OutputDRC cleanv1.1

High-side switch 3 A, up to 20 V

P-MOSFET high-side switch driven by a small N-MOSFET, so a 3.3 V GPIO can switch a 3.3–20 V rail or load: peripheral power, 12 V pumps or valves up to 3 A. A Zener diode clamps the gate-source voltage to about 10 V, so the MOSFET gate stays within its limit at any supply up to 20 V. The control input is pulled down, so the load is off at reset.

3D render of the 0115 High-side switch 3 A, up to 20 V KiCad design block
3D render (KiCad 10)
3D render of the 0115 High-side switch 3 A, up to 20 V KiCad design block
3D render, top view (KiCad 10)
Schematic of the 0115 High-side switch 3 A, up to 20 V KiCad design block
Schematic (KiCad 10)

Key specifications

  • Supply 3.3–20 V
  • Load current up to 3 A (needs copper area for cooling)
  • Control: high = on, pulled down (off at reset)
  • Gate-source voltage clamped to about 10 V
  • Slow turn-off: for on/off switching, not for PWM

Design notes

  • Inductive loads (pumps, valves): add a freewheel diode across the load; it is not in this block.
  • Not built yet: the gate clamp and switching at 12 V are still to be verified on a prototype.

Seen in real hardware

Flossa AI Controller PCBA, 3D render, isometric view

Flossa AI Controller

Uses this block alongside 9 other templates · flossa.ai

Coming soon

This block is not available yet. It is released once its checks are complete. Planned price: €29.

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Planned package contents

  • KiCad 10 design block

    Schematic and PCB layout fragment; symbols and footprints embedded

  • BOM (CSV)

    Manufacturer part numbers and LCSC codes

  • Schematic PDF + README

    Interface, specs, population options and design notes

  • 3D models

    STEP models of the special parts; standard parts use KiCad’s 3D library

  • template.yaml

    Machine-readable interface and limits

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About PCB Composer

Development status

Block ID0115
Block name0115-highside-switch-3a-20v
Version1.1
StatusDRC clean – Schematic and layout pass the KiCad rule checks; not yet verified on hardware.
Open review items2 (0 blocking)
PCB layoutRule-checked layout fragment
FormatKiCad 10 design block (schematic + PCB)
Last change2026-11-03

Interface

Hierarchical labels the block exposes to the rest of your design. ${ID} is replaced per instance, so several copies can live on one sheet.

NetDirectionDescription
HS_SWITCH_SUP_${ID}Power inSupply to be switched, 3.3–20 V
HS_SWITCH_LOAD_${ID}Power outSwitched supply to the load
DO_HS_SWITCH_${ID}InputControl from a GPIO, high = on; pulled down

FAQ

Which KiCad version do I need?

KiCad 10. The files are saved in the KiCad 10 format and are meant to be placed with KiCad’s Design Blocks feature (schematic block, then “Apply Design Block Layout” on the PCB).

Do I need the Circuit Issues part library?

No. Symbols are embedded in the schematic and footprints in the PCB, so the block opens on its own. Parts carry manufacturer part numbers and LCSC codes.

Is the layout production-ready?

The layout fragment passes the KiCad design rule check. Route it into your board and run DRC with your own fab rules.

Can I use the template in a commercial product?

The licence terms are published together with the first release.

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