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ELECTRONICS

TTP223 Touch Switch with MOSFET for LED Strip

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UPDATED 2026-08-13
TYPECircuit
USE-CASETtp223 Touch Switch
EXAMPLETTP223 Touch Switch with MOSFET for LED Strip
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CASE ANALYSIS

Scenario

A capacitive touch switch controls a low-side N-channel MOSFET to turn a 5V LED strip on and off. The TTP223 output drives the MOSFET gate, with a pull-down resistor keeping the gate low when idle.

Key decisions

  • Use N-channel MOSFET low-side switching so the gate can be driven directly from the TTP223's 5V output
  • Add 10k pull-down resistor on the gate to keep the LED strip off during power-up or no-touch
  • Place 100nF decoupling capacitor across TTP223 VCC for stable touch detection

When to reuse this

Reuse for any capacitive touch toggle switch controlling low-power LED strips or small DC loads from a 5V sensor output.

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