XLAMP® CXB2540 LED

© 2015-2021 Cree LED. The information in this document is subject to change without notice. Cree® and the Cree logo are registered trademarks, and

the Cree LED logo is a trademark, of Wolfspeed, Inc. XLamp® and EasyWhite® are registered trademarks of Cree LED. UL® and the UL logo are registered

trademarks of UL LLC.

CLD-DS123

REV 10A

2

CHARACTERISTICS

Characteristics

Unit

Minimum

Typical

Maximum

Viewing angle (FWHM)

degrees

115

ESD withstand voltage (HBM per Mil‑Std‑883D)

V

8000

DC forward current

mA

2100*

Reverse current

mA

0.1

Forward voltage (@ 1100 mA, T

j = 85 °C)

V

34.1

38

*

Refer to the Operating Limits section.

OPERATING LIMITS

The maximum current rating of the CXB2540 depends on the case temperature (Tc) when the LED has reached thermal equilibrium under

steady‑state operation. The graph shown below assumes that the system design employs good thermal management (thermal interface

material and heat sink) and may vary when poor thermal management is employed. Please refer to the Mechanical Dimensions section

on page 16 for the location of the Tc measurement point.

Another important factor in good thermal management is the temperature of the Light Emitting Surface (LES). Cree LED recommends a

maximum LES temperature of 135 °C to ensure optimal LED lifetime. Please refer to the Thermal Design section on page 17 for more

information on LES temperature measurement.

CXB2540 - Standard

0

300

600

900

1200

1500

1800

2100

2400

0

25

50

75

100

125

150

Case Temperature (°C)

85 °C, 2100 mA

125 °C,

808 mA