Bourns LSPxAJR LED Shunt Protectors

Bourns LSPxAJR LED Shunt Protectors are electronic shunts that provide a current bypass when an LED element in an LED string fails open circuit. This ensures the remaining string of LEDs will continue to function. Adding Bourns LSP Series shunt protectors to an LED design allows the healthy LEDs in the string to remain illuminated by shunting current around the inoperable open circuit LED. Bourns LSPxAJR Series LED Shunt Protectors employ proven thyristor technology similar to Bourns TISP® devices. During normal operation of the circuit, there is no current flowing through the device. Only in the event of an open circuit does the Bourns LSP device become active. These shunts are ideal for applications in which high reliability of the LED lighting must be maintained, such as LCD backlighting, transport lighting, avionics, intrinsically safe, and low maintenance lighting. The LSP Series is available in a surface mount package DO-214AC (SMA) size format.


  • Fast switching
  • Automatic reset
  • SMA package
  • Surge protection
  • Suitable for industrial lighting
  • RoHS compliant


  • 30mA holding current
  • DO-214AC (SMA) package
  • -40°C to +150°C operating temperature range
  • SMD/SMT mounting style
  • 10μA off-state leakage current @ VDRM IDRM


  • LED streetlights
  • LCD backlighting
  • Display lighting
  • Intrinsically safe lighting

Typical Application

Bourns LSPxAJR LED Shunt Protectors

Note: The interaction between the Bourns LSP device and the power supply for the LED series string dictates the power supply architecture. Proper care must be taken in the design of the power supply architecture to ensure that the Bourns LSP devices operate as intended and the design maintains integrity.

Unprotected LED & Single Bourns LSP Circuit

Bourns LSPxAJR LED Shunt Protectors
Published: 2012-01-26 | Updated: 2022-03-11