Tutorial: LD271 / CQY99

Produces or controls light in an electronic circuit.

LD271 / CQY99

Tutorial / documentation

LED & lighting

Quick documentation & first test preparation

  1. Identify component LD271 and its package.
  2. Check operating current, polarity and forward or driver voltage.
  3. Size the current limiting and thermal dissipation.
  4. Consult the application circuit in the linked documentation before testing.

LD271

940nm IR-LED, 5mm

  • 940nm IR-LED, 5mm
  • Check operating current, polarity and forward or driver voltage.
  • Size the current limiting and thermal dissipation.
  • The manufacturer’s pinout and absolute limits take precedence over this page.
Technical documentation

CQY99

950nm IR-LED, 5mm

  • 950nm IR-LED, 5mm
  • Check operating current, polarity and forward or driver voltage.
  • Size the current limiting and thermal dissipation.
  • The manufacturer’s pinout and absolute limits take precedence over this page.
Technical documentation

Inputs and outputs must match the function described in the selected reference’s documentation.