Product family data sheet
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and
EasyWhite® are registered trademarks and the Cree logo is a trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
Cree, Inc.
4600 Silicon Drive
Durham, NC 27703
USA Tel: +1.919.313.5300
WWW.CREE.COM/XLAMP
CLD-DS123 REV 4
Cree® XLamp® CXB2540 LED
PRODUCT DESCRIPTION
The XLamp® CXB2540 LED Array is a
member of the second generation of
the CXA family that delivers up to 30%
higher efcacy and up to 20% higher
lumens than the rst generation in the
same LES. The higher performance
second generation CXA LED Arrays
provide a drop-in performance upgrade
to existing CXA LED designs to shorten
product development time. In addition,
the CXB LEDs also allow lighting
manufacturers to achieve the same
or better performance with a smaller
LES, enabling a smaller, more impactful
luminaire. Available in 2-step, 3-step
and 5-step EasyWhite® bins and 2-step
and 3-step Premium Color bins, the
CXB2540 LED delivers high lumen
output and high efcacy in a single,
easy-to-use package that eliminates the
need for reow soldering.
The CX Family LED Design Guide
provides basic information on the
requirements to use the CXB2540 LED
successfully in luminaire designs.
FEATURES
• 19-mm optical source
• Mechanical and optical design
consistent with other CXA25 and
CXB25 LEDs
• Available in 70-, 80-, 90- and
95-minimum CRI options
• Cree EasyWhite® 2-, 3- and 5-step
binning
• Premium Color 2- and 3-step binning
• Forward voltage option: 36-V class
• 85°C binning and characterization
• Extremely uniform color over viewing
angle
• Top-side solder connections
• Thermocouple attach point
• NEMA SSL-3 2011 standard ux bins
• RoHS and REACh compliant
• UL® recognized component
(E349212)
TABLE OF CONTENTS
Characteristics ............................................2
Operating Limits ..........................................2
Flux Characteristics, EasyWhite® Order
Codes and Bins ...........................................3
Flux Characteristics, Premium Color
Order Codes and Bins .................................6
Relative Spectral Power Distribution .........7
Relative Spectral Power Distribution,
Premium Color ............................................7
Electrical Characteristics ............................8
Relative Luminous Flux ...............................9
Typical Spatial Distribution ...................... 10
Performance Groups - Brightness .......... 10
Performance Groups - Chromaticity ....... 11
Premium Color Performance Groups -
Chromaticity ............................................. 12
Cree’s EasyWhite® Bins Plotted on the
1931 CIE Color Space .............................. 13
Cree Premium Color Bins Plotted on the
1931 CIE Color Space .............................. 14
Bin and Order Code Formats ................... 16
Mechanical Dimensions .......................... 16
Thermal Design ........................................ 17
Notes ........................................................ 18
Packaging ................................................. 19
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
2
XLamp® CXB2540 LED
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, Tj = 85°C) V 34.8 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 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
0
300
600
900
1200
1500
1800
2100
2400
025 50 75 100 125 150
If (mA)
Case Temperature (°C)
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
3
XLamp® CXB2540 LED
Notes
• Cree maintains a tolerance of ±7% on ux and power measurements, ±0.005 on chromaticity (CCx, CCy) measurements and a tolerance of ±2 on CRI
measurements. See the Measurements section (page 18).
• Cree XLamp CXB2540 LED order codes specify only a minimum ux bin and not a maximum. Cree may ship reels in ux bins higher than the minimum
specied by the order code without advance notice. Shipments will always adhere to the chromaticity bin restrictions specied by the order code.
* For 80 CRI minimum LEDs, CRI R9 minimum is 0 with a ±2 tolerance. For 90 CRI minimum LEDs, CRI R9 typical is 60.
** Flux values @ 25°C are calculated and for reference only.
FLUX CHARACTERISTICS, EASYWHITE® ORDER CODES AND BINS (IF mA, TJ 
The following table provides order codes for XLamp CXB2540 LEDs. For a complete description of the order code nomenclature, please
see the Bin and Order Code Formats section (page 16).
Nominal
CCT
CRI* Minimum Luminous Flux 2-Step 3-Step 5-Step
Min Typ Group 


 Group Order Code Group Order Code Group Order Code
6500K
70 ---
W4 5225 5784
65E
CXB2540-0000-
000N0BW465E
X2 5590 6188 CXB2540-0000-
000N0BX265E
X4 6010 6653 CXB2540-0000-
000N0BX465E
80 ---
W4 5225 5784
65E
CXB2540-0000-
000N0HW465E
X2 5590 6188 CXB2540-0000-
000N0HX265E
X4 6010 6653 CXB2540-0000-
000N0HX465E
5700K
70 ---
W4 5225 5784
57E
CXB2540-0000-
000N0BW457E
X2 5590 6188 CXB2540-0000-
000N0BX257E
X4 6010 6653 CXB2540-0000-
000N0BX457E
80 ---
W4 5225 5784
57E
CXB2540-0000-
000N0HW457E
X2 5590 6188 CXB2540-0000-
000N0HX257E
X4 6010 6653 CXB2540-0000-
000N0HX457E
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
4
XLamp® CXB2540 LED
Notes
• Cree maintains a tolerance of ±7% on ux and power measurements, ±0.005 on chromaticity (CCx, CCy) measurements and a tolerance of ±2 on CRI
measurements. See the Measurements section (page 18).
• Cree XLamp CXB2540 LED order codes specify only a minimum ux bin and not a maximum. Cree may ship reels in ux bins higher than the minimum
specied by the order code without advance notice. Shipments will always adhere to the chromaticity bin restrictions specied by the order code.
* For 80 CRI minimum LEDs, CRI R9 minimum is 0 with a ±2 tolerance. For 90 CRI minimum LEDs, CRI R9 typical is 60.
** Flux values @ 25°C are calculated and for reference only.
Nominal
CCT
CRI* Minimum Luminous Flux 2-Step 3-Step 5-Step
Min Typ Group 


 Group Order Code Group Order Code Group Order Code
5000K
70 ---
W4 5225 5784
50E
CXB2540-0000-
000N0BW450E
X2 5590 6188 CXB2540-0000-
000N0BX250E
X4 6010 6653 CXB2540-0000-
000N0BX450E
80 ---
W4 5225 5784
50G
CXB2540-0000-
000N0HW450G
50E
CXB2540-0000-
000N0HW450E
X2 5590 6188 CXB2540-0000-
000N0HX250G
CXB2540-0000-
000N0HX250E
X4 6010 6653 CXB2540-0000-
000N0HX450G
CXB2540-0000-
000N0HX450E
90 92
V4 4545 5031
50G
CXB2540-0000-
000N0UV450G
W2 4860 5380 CXB2540-0000-
000N0UW250G
W4 5225 5784 CXB2540-0000-
000N0UW450G
4000K
70 ---
W4 5225 5784
40E
CXB2540-0000-
000N0BW440E
X2 5590 6188 CXB2540-0000-
000N0BX240E
X4 6010 6653 CXB2540-0000-
000N0BX440E
80 ---
W2 4860 5380
40H
CXB2540-0000-
000N0HW240H
40G
CXB2540-0000-
000N0HW240G
W4 5225 5784 CXB2540-0000-
000N0HW440H
CXB2540-0000-
000N0HW440G
X2 5590 6188 CXB2540-0000-
000N0HX240H
CXB2540-0000-
000N0HX240G
90 92
V2 4230 4683
40H
CXB2540-0000-
000N0UV240H
40G
CXB2540-0000-
000N0UV240G
V4 4545 5031 CXB2540-0000-
000N0UV440H
CXB2540-0000-
000N0UV440G
W2 4860 5380 CXB2540-0000-
000N0UW240H
CXB2540-0000-
000N0UW240G
FLUX CHARACTERISTICS, EASYWHITE® ORDER CODES AND BINS (IF mA, TJ 
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
5
XLamp® CXB2540 LED
Notes
• Cree maintains a tolerance of ±7% on ux and power measurements, ±0.005 on chromaticity (CCx, CCy) measurements and a tolerance of ±2 on CRI
measurements. See the Measurements section (page 18).
• Cree XLamp CXB2540 LED order codes specify only a minimum ux bin and not a maximum. Cree may ship reels in ux bins higher than the minimum
specied by the order code without advance notice. Shipments will always adhere to the chromaticity bin restrictions specied by the order code.
* For 80 CRI minimum LEDs, CRI R9 minimum is 0 with a ±2 tolerance. For 90 CRI minimum LEDs, CRI R9 typical is 60.
** Flux values @ 25°C are calculated and for reference only.
Nominal
CCT
CRI* Minimum Luminous Flux 2-Step 3-Step 5-Step
Min Typ Group 


 Group Order Code Group Order Code Group Order Code
3500K
80 ---
W2 4860 5380
35H
CXB2540-0000-
000N0HW235H
35G
CXB2540-0000-
000N0HW235G
W4 5225 5784 CXB2540-0000-
000N0HW435H
CXB2540-0000-
000N0HW435G
X2 5590 6188 CXB2540-0000-
000N0HX235H
CXB2540-0000-
000N0HX235G
90 92
V2 4230 4683
35H
CXB2540-0000-
000N0UV235H
35G
CXB2540-0000-
000N0UV235G
V4 4545 5031 CXB2540-0000-
000N0UV435H
CXB2540-0000-
000N0UV435G
W2 4860 5380 CXB2540-0000-
000N0UW235H
CXB2540-0000-
000N0UW235G
3000K
80 ---
V4 4545 5031
30H
CXB2540-0000-
000N0HV430H
30G
CXB2540-0000-
000N0HV430G
W2 4860 5380 CXB2540-0000-
000N0HW230H
CXB2540-0000-
000N0HW230G
W4 5225 5784 CXB2540-0000-
000N0HW430H
CXB2540-0000-
000N0HW430G
90 92
U4 3955 4378
30H
CXB2540-0000-
000N0UU430H
30G
CXB2540-0000-
000N0UU430G
V2 4230 4683 CXB2540-0000-
000N0UV230H
CXB2540-0000-
000N0UV230G
V4 4545 5031 CXB2540-0000-
000N0UV430H
CXB2540-0000-
000N0UV430G
2700K
80 ---
V4 4545 5031
27H
CXB2540-0000-
000N0HV427H
27G
CXB2540-0000-
000N0HV427G
W2 4860 5380 CXB2540-0000-
000N0HW227H
CXB2540-0000-
000N0HW227G
W4 5225 5784 CXB2540-0000-
000N0HW427H
CXB2540-0000-
000N0HW427G
90 92
U2 3680 4074
27H
CXB2540-0000-
000N0UU227H
27G
CXB2540-0000-
000N0UU227G
U4 3955 4378 CXB2540-0000-
000N0UU427H
CXB2540-0000-
000N0UU427G
V2 4230 4683 CXB2540-0000-
000N0UV227H
CXB2540-0000-
000N0UV227G
FLUX CHARACTERISTICS, EASYWHITE® ORDER CODES AND BINS (IF mA, TJ 
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
6
XLamp® CXB2540 LED
Notes
• Cree maintains a tolerance of ±7% on ux and power measurements, ±0.005 on chromaticity (CCx, CCy) measurements and a tolerance of ±2 on CRI
measurements. See the Measurements section (page 18).
• Cree XLamp CXB2540 LED order codes specify only a minimum ux bin and not a maximum. Cree may ship reels in ux bins higher than the minimum
specied by the order code without advance notice. Shipments will always adhere to the chromaticity bin restrictions specied by the order code.
* For 80 CRI minimum LEDs, CRI R9 minimum is 0 with a ±2 tolerance. For 90 CRI minimum LEDs, CRI R9 typical is 60.
** Flux values @ 25°C are calculated and for reference only.
FLUX CHARACTERISTICS, PREMIUM COLOR ORDER CODES AND BINS (IF mA, TJ 
Fidelity
Nominal
CCT
CRI* Minimum Luminous Flux Typical
Luminous


2-Step
Min Typ Group 


 Group Order Code
4000K 95 98 U4 3955 4378 4451 L5A CXB2540-0000-000N0ZU4L5A
3500K 95 98 U4 3955 4378 4286 35H CXB2540-0000-000N0ZU435H
3000K 95 98 U2 3680 4074 4121 30H CXB2540-0000-000N0ZU230H
2700K 95 98 U2 3680 4074 3888 27H CXB2540-0000-000N0ZU227H
Specialty
Nominal
CCT
CRI Minimum Luminous Flux Typical
Luminous


2-Step 3-Step
Min Typ Group 


 Group Order Code Group Order Code Group Order Code
3100 K 90 92 U4 3955 4378 4749 31Q CXB2540-0000-
000N0UU431Q
3000K
80 --- W2 4860 5380 5522 L7B CXB2540-0000-
000N0HW2L7B
90 92
U2 3680 4074
4749 30Q 30U
CXB2540-0000-
000N0UU230U
U4 3955 4378 CXB2540-0000-
000N0UU430Q
CXB2540-0000-
000N0UU430U
V2 4230 4683 CXB2540-0000-
000N0UV230Q
CXB2540-0000-
000N0UV230U
95 98 U2 3680 4074 4121 L7C CXB2540-0000-
000N0ZU2L7C
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
7
XLamp® CXB2540 LED
RELATIVE SPECTRAL POWER DISTRIBUTION
The following graph is the result of a series of pulsed measurements at 1100mA and TJ = 85°C.
RELATIVE SPECTRAL POWER DISTRIBUTION, PREMIUM COLOR
The following graphs are the result of a series of pulsed measurements at 800mA and TJ = 85°C.
Fidelity
Relative Spectral Power Distribution
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
380 430 480 530 580 630 680 730 780
Relative Spectral Power
Wavelength (nm)
5000 K, 70 CRI
4000 K, 70 CRI
3000 K, 80 CRI
3000 K, 90 CRI
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
380 430 480 530 580 630 680 730 780
Relative Spectral Power
Wavelength (nm)
4000 K, Z CRI
3500 K, Z CRI
3000 K, Z CRI
2700 K, Z CRI
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
8
XLamp® CXB2540 LED
RELATIVE SPECTRAL POWER DISTRIBUTION, PREMIUM COLOR - CONTINUED
Specialty
ELECTRICAL CHARACTERISTICS
The following graph is the result of a series of steady-state measurements.
Relative Spectral Power Distribution
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
380 430 480 530 580 630 680 730 780
Relative Spectral Power
Wavelength (nm)
31Q, 3100 K, 90 CRI
30Q, 3000 K, 90 CRI
30U, 3000 K, 90 CRI
L7B, 3000 K 80 CRI
L7C, 3000 K, Z CRI
32
33
34
35
36
37
38
39
400 740 1080 1420 1760 2100
Voltage (V)
Current (mA)
Tc = 25 °C
Tc = 55 °C
Tc = 85 °C
Tc = 105 °C
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
9
XLamp® CXB2540 LED
RELATIVE LUMINOUS FLUX
The relative luminous ux values provided below are the ratio of measurements of the CXB2540 LED at steady-state operation at the given
conditions, divided by the ux measured during binning, which is a pulsed measurement at 1100mA at TJ = 85°C.
For example, at steady-state operation of Tc = 25°C, IF = 740mA, the relative luminous ux ratio is 80% in the chart below. A CXB2540 LED
that measures 5225lm during binning will deliver 4180lm (5225 * 0.8) at steady-state operation of Tc = 25°C, IF = 740mA.
0%
20%
40%
60%
80%
100%
120%
140%
160%
180%
400 740 1080 1420 1760 2100
Relative Luminous Flux
Current (mA)
Tc = 25 °C
Tc = 55 °C
Tc = 85 °C
Tc = 105 °C
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
10
XLamp® CXB2540 LED
TYPICAL SPATIAL DISTRIBUTION
PERFORMANCE GROUPS - BRIGHTNESS (IF mA, TJ 
XLamp CXB2540 LEDs are tested for luminous ux and placed into one of the following bins.
Group Code Minimum Luminous Flux Maximum Luminous Flux
U2 3680 3955
U4 3955 4230
V2 4230 4545
V4 4545 4860
W2 4860 5225
W4 5225 5590
X2 5590 6010
X4 6010 6430
Y2 6430 6910
Far Field
0%
20%
40%
60%
80%
100%
-90 -70 -50 -30 -10 10 30 50 70 90
Relative Luminous Intensity
Angle (º)
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
11
XLamp® CXB2540 LED
PERFORMANCE GROUPS - CHROMATICITY (TJ 
XLamp CXB2540 LEDs are tested for chromaticity and placed into one of the regions dened by the following bounding coordinates.
EasyWhite Color Temperatures – 2-Step
Code CCT x y
40H 4000K
0.3777 0.3739
0.3797 0.3816
0.3861 0.3855
0.3838 0.3777
35H 3500K
0.4022 0.3858
0.4053 0.3942
0.4125 0.3977
0.4091 0.3891
30H 3000K
0.4287 0.3975
0.4328 0.4064
0.4390 0.4086
0.4347 0.3996
27H 2700K
0.4524 0.4048
0.4574 0.4140
0.4633 0.4154
0.4581 0.4062
EasyWhite Color Temperatures – 3-Step Ellipse
Bin Code CCT Center Point Major Axis Minor Axis Rotation Angle

x y a b
50G 5000K 0.3447 0.3553 0.00840 0.00312 65.0
40G 4000K 0.3818 0.3797 0.00939 0.00402 53.7
35G 3500K 0.4073 0.3917 0.00927 0.00414 54.0
30G 3000K 0.4338 0.4030 0.00834 0.00408 53.2
27G 2700K 0.4577 0.4099 0.00834 0.00420 48.5
EasyWhite Color Temperatures – 5-Step Ellipse
Bin Code CCT Center Point Major Axis Minor Axis Rotation Angle

x y a b
65E 6500K 0.3123 0.3282 0.01110 0.00550 61.0
57E 5700K 0.3287 0.3417 0.01230 0.00600 72.0
50E 5000K 0.3447 0.3553 0.01400 0.00520 65.0
40E 4000K 0.3818 0.3797 0.01565 0.00670 53.7
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
12
XLamp® CXB2540 LED
PREMIUM COLOR PERFORMANCE GROUPS - CHROMATICITY (TJ
XLamp CXB2540 LEDs are tested for chromaticity and placed into one of the regions dened by the following bounding coordinates.
Fidelity
EasyWhite Color Temperatures – 2-Step
Code CCT x y
L5A 4000K
0.3764 0.3711
0.3784 0.3787
0.3847 0.3826
0.3825 0.3748
35H 3500K
0.4022 0.3858
0.4053 0.3942
0.4125 0.3977
0.4091 0.3891
30H 3000K
0.4287 0.3975
0.4328 0.4064
0.4390 0.4086
0.4347 0.3996
27H 2700K
0.4524 0.4048
0.4574 0.4140
0.4633 0.4154
0.4581 0.4062
Specialty
EasyWhite Color Temperatures – 2-Step
Code CCT x y
L7B 3000K
0.4263 0.3848
0.4296 0.3916
0.4361 0.3938
0.4326 0.3868
L7C 3000K
0.4192 0.3754
0.4224 0.3823
0.4291 0.3847
0.4257 0.3777
EasyWhite Color Temperatures – 3-Step Ellipse
Bin Code CCT Center Point Major Axis Minor Axis Rotation Angle

x y a b
31Q 3100K 0.4236 0.3888 0.00848 0.00455 50.3
30Q 3000K 0.4305 0.3935 0.00834 0.00408 53.2
30U 3000K 0.4274 0.3837 0.00834 0.00408 53.2
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
13
XLamp® CXB2540 LED
CREE’S EASYWHITE® BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ 
2700 K
3000 K
3500 K
4000 K
4500 K
5000 K
5700 K
6500 K
0.31
0.32
0.33
0.34
0.35
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.29
0.30
0.31
0.32
0.33
0.34
0.35
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.45
0.46
0.47
0.48
CCy
CCx
ANSI C78.377 Quadrangle
EasyWhite 5-step
EasyWhite 3-step
EasyWhite 2-step
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
14
XLamp® CXB2540 LED
CREE PREMIUM COLOR BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ 

2700K
3000K
3500K
4000K
4500K
L5A
0.34
0.35
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.35
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.45
0.46
0.47
0.48
CCy
CCx
ANSI C78.377 Quadrangle
35H
30H
27H
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
15
XLamp® CXB2540 LED
CREE PREMIUM COLOR BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ 


3000 K
3500 K
L7B
L7C
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.41
0.42
0.43
0.44
0.45
0.46
CCx
ANSI C78.377 Quadrangle
3000K
3500K
30Q
30U
31Q
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.44
0.41
0.42
0.43
0.44
0.45
0.46
CCy
CCx
ANSI C78.377 Quadrangle
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
16
XLamp® CXB2540 LED
BIN AND ORDER CODE FORMATS
Bin codes and order codes are congured as follows:
Order Code Bin Code
MECHANICAL DIMENSIONS
Dimensions are in mm.
Tolerances unless otherwise
specied: ±.13
x° ±1°
Meaning of B2540N
B2540N = 36-V CXB2540
SSSSSCC-HHHH-HHHGGRNNNNN
Series = CXB25
Internal code
CRI Specification
B = 70 CRI minimum
H = 80 CRI minimum
U = 90 CRI minimum
Z = 95 CRI minimum
Kit code
Vf class
N0 = 36-V class
Performance class
SSSSSCC-WWW-FF-GGR-AAAAA
Series = CXB25
Chromaticity bin
Vf class
N0 = 36-V class
Internal code
CRI Specification
B = 70 CRI minimum
H = 80 CRI minimum
U = 90 CRI minimum
Z = 95 CRI minimum
Flux bin
Performance class
B2540N
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
17
XLamp® CXB2540 LED
THERMAL DESIGN
The CXB family of LED arrays can include over a hundred different LED die inside one package, and thus over a hundred different junction
temperatures (TJ). Cree has intentionally removed junction-temperature-based operating limits and replaced the commonplace maximum
TJ calculations with maximum ratings based on forward current (IF) and case temperature (Tc). No additional calculations are required to
ensure that the CXB LED is being operated within its designed limits. LES temperature measurement provides additional verication of
good thermal design. Please refer to page 2 for the Operating Limit specications.
There is no need to calculate for TJ inside the package, as the thermal management design process, specically from TSP to ambient
(Ta), remains identical to any other LED component. For more information on thermal management of Cree XLamp LEDs, please refer to
the Thermal Management application note. For CXB soldering recommendations and more information on thermal interface materials
(TIM), LES temperature measurement, and connection methods, please refer to the Cree XLamp CX Family LEDs soldering and handling
document. The CX Family LED Design Guide provides basic information on the requirements to use Cree XLamp CXB LEDs successfully
in luminaire designs.
To keep the CXB2540 LED at or below the maximum rated Tc, the case to ambient temperature
thermal resistance (R_c-a) must be at or below the maximum R_c-a value shown on the following
graph, depending on the operating environment. The y-axis in the graph is a base 10 logarithmic
scale.
As the gure at right shows, the R_c-a value is the sum of the thermal resistance of the TIM (R_tim)
plus the thermal resistance of the heat sink (R_hs).
R_j-c
Tc
R_tim
R_hs
Ta
R_j-c
Tc
R_c-a
Ta
CXB2540
0.01
0.10
1.00
10.00
400 740 1080 1420 1760 2100
Maximum R_c-a
Current (mA)
Ta = 25 °C
Ta = 55 °C
Ta = 85 °C
Ta = 105 °C
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
18
XLamp® CXB2540 LED
NOTES
Measurements
The luminous ux, radiant power, chromaticity, forward voltage and CRI measurements in this document are binning specications only
and solely represent product measurements as of the date of shipment. These measurements will change over time based on a number
of factors that are not within Cree’s control and are not intended or provided as operational specications for the products. Calculated
values are provided for informational purposes only and are not intended as specications.

Please read the LED Reliability Overview for details of the qualication process Cree applies to ensure long-term reliability for XLamp
LEDs and details of Cree’s pre-release qualication testing for XLamp LEDs.
Lumen Maintenance
Cree now uses standardized IES LM-80-08 and TM-21-11 methods for collecting long-term data and extrapolating LED lumen maintenance.
For information on the specic LM-80 data sets available for this LED, refer to the public LM-80 results document.
Please read the Long-Term Lumen Maintenance application note for more details on Cree’s lumen maintenance testing and forecasting.
Please read the Thermal Management application note for details on how thermal design, ambient temperature, and drive current affect
the LED junction temperature.
RoHS Compliance
The levels of RoHS restricted materials in this product are below the maximum concentration values (also referred to as the threshold
limits) permitted for such substances, or are used in an exempted application, in accordance with EU Directive 2011/65/EC (RoHS2), as
implemented January 2, 2013. RoHS Declarations for this product can be obtained from your Cree representative or from the Product
Ecology section of the Cree website.
REACh Compliance
REACh substances of very high concern (SVHCs) information is available for this product. Since the European Chemical Agency (ECHA)
has published notice of their intent to frequently revise the SVHC listing for the foreseeable future, please contact a Cree representative
to insure you get the most up-to-date REACh Declaration. REACh banned substance information (REACh Article 67) is also available upon
request.
UL® Recognized Component
Level 4 enclosure consideration. The LED package or a portion thereof has been investigated as a re and electrical enclosure per ANSI/
UL 8750.
Vision Advisory
WARNING: Do not look at an exposed lamp in operation. Eye injury can result. For more information about LEDs and eye safety, please
refer to the LED Eye Safety application note.
Copyright © 2015-2017 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, XLamp® and EasyWhite® are registered trademarks and the Cree logo is a
trademark of Cree, Inc. UL® and the UR logo are registered trademarks of UL LLC.
19
XLamp® CXB2540 LED
PACKAGING
Cree CXB2540 LEDs are packaged in trays of 20. Five trays are sealed SCin an anti-static bag and placed inside a carton, for a total of 100
LEDs per carton. Each carton contains 100 LEDs from the same performance bin.
Dimensions are in inches.
Tolerances: ±.13
x° ±1°
SIZE
TITLE
OF
REV.
SHEET
C
DRAWING NO.
DATE
DATE
DATE
CHECK
FINAL PROTECTIVE FINISH
MATERIAL
APPROVED
DRAWN BY
THIRD ANGLE PROJECTION
.X ± 0.1
X° ± 2 °
.XXX ± .010
.XX ± .03
.X ± .06
FOR SHEET METAL PARTS ONLY
.XX ± .05
.XXX ± .005
X° ± 1 °
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN
MILLIMETERS & BEFORE FINISH.
TOLERANCE UNLESS SPECIFIED:
SCALE
A
B
C
D
123456
6 5 4 3 2 1
A
B
C
D
Phone (919) 361-4770
Fax (919) 313-5303
4600 Silicon Drive
Durham, N.C 27703
UNAUTHORIZED PERSON WITHOUT
THE WRITTEN CONSENT
MAY NOT BE COPIED, REPRODUCED OR DISCLOSED TO ANY
CONFIDENTIAL INFORMATION OF CREE, INC. THIS PLOT
CONTAINED WITHIN ARE THE PROPRIETARY AND
CREE CONFIDENTIAL. THIS PLOT AND THE INFORMATION
OF CREE INC.
NOTICE
7.625
7.125
R.375
1.188
1.188 .38
1/10.500
A
CXA25XX_DATASHEET_BAG2013
CXA25XX_DATASHEET
BAG
PATENT LABEL IS LOCATED
ON UNDERSIDE OF COVER
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
SIZE
TITLE
OF
REV.
SHEET
C
DRAWING NO.
DATE
DATE
DATE
CHECK
FINAL PROTECTIVE FINISH
MATERIAL
APPROVED
DRAWN BY
THIRD ANGLE PROJECTION
.X ± 0.1
X° ± 2 °
.XXX ± .010
.XX ± .03
.X ± .06
FOR SHEET METAL PARTS ONLY
.XX ± .05
.XXX ± .005
X° ± 1 °
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN
MILLIMETERS & BEFORE FINISH.
TOLERANCE UNLESS SPECIFIED:
SCALE
A
B
C
D
123456
6 5 4 3 2 1
A
B
C
D
Phone (919) 361-4770
Fax (919) 313-5303
4600 Silicon Drive
Durham, N.C 27703
UNAUTHORIZED PERSON WITHOUT
THE WRITTEN CONSENT
MAY NOT BE COPIED, REPRODUCED OR DISCLOSED TO ANY
CONFIDENTIAL INFORMATION OF CREE, INC. THIS PLOT
CONTAINED WITHIN ARE THE PROPRIETARY AND
CREE CONFIDENTIAL. THIS PLOT AND THE INFORMATION
OF CREE INC.
NOTICE
7.625
7.125
R.375
1.188
1.188 .38
1/10.500
A
CXA25XX_DATASHEET_BAG2013
CXA25XX_DATASHEET
BAG
PATENT LABEL IS LOCATED
ON UNDERSIDE OF COVER
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
PATENT LABEL IS LOCATED
ON UNDERSIDE OF CARTON
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
SIZE
TITLE
OF
REV.
SHEET
C
DRAWING NO.
DATE
DATE
DATE
CHECK
FINAL PROTECTIVE FINISH
MATERIAL
APPROVED
DRAWN BY
THIRD ANGLE PROJECTION
.X ± 0.1
X° ± 2 °
.XXX ± .010
.XX ± .03
.X ± .06
FOR SHEET METAL PARTS ONLY
.XX ± .05
.XXX ± .005
X° ± 1 °
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN
MILLIMETERS & BEFORE FINISH.
TOLERANCE UNLESS SPECIFIED:
SCALE
A
B
C
D
123456
6 5 4 3 2 1
A
B
C
D
Phone (919) 361-4770
Fax (919) 313-5303
4600 Silicon Drive
Durham, N.C 27703
UNAUTHORIZED PERSON WITHOUT
THE WRITTEN CONSENT
MAY NOT BE COPIED, REPRODUCED OR DISCLOSED TO ANY
CONFIDENTIAL INFORMATION OF CREE, INC. THIS PLOT
CONTAINED WITHIN ARE THE PROPRIETARY AND
CREE CONFIDENTIAL. THIS PLOT AND THE INFORMATION
OF CREE INC.
NOTICE
5.875
5.875
.38
R.375
.875
.875
1/10.500
A
CXA15XX_DATASHEET_BAG2013
CXA15XX_DATASHEET
BAG
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
LABEL WITH CREE BIN
CODE, QUANTITY, LOT #
PATENT LABEL IS LOCATED
ON UNDERSIDE OF COVER
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Cree, Inc.:
CXB2540-0000-000N0HW235H CXB2540-0000-000N0HV430H CXB2540-0000-000N0BW450E CXB2540-0000-
000N0HW227G CXB2540-0000-000N0HW227H CXB2540-0000-000N0HV427H CXB2540-0000-000N0UV440H
CXB2540-0000-000N0BX250E CXB2540-0000-000N0BW440E CXB2540-0000-000N0UV230H CXB2540-0000-
000N0HV427G CXB2540-0000-000N0HW457E CXB2540-0000-000N0UV235H CXB2540-0000-000N0HW435H
CXB2540-0000-000N0HW450E CXB2540-0000-000N0HW450G CXB2540-0000-000N0HX265E CXB2540-0000-
000N0UU430H CXB2540-0000-000N0UU430G CXB2540-0000-000N0UV235G CXB2540-0000-000N0BX257E
CXB2540-0000-000N0UV240G CXB2540-0000-000N0HW440H CXB2540-0000-000N0UU427H CXB2540-0000-
000N0HW435G CXB2540-0000-000N0UW250G CXB2540-0000-000N0BW457E CXB2540-0000-000N0UV450G
CXB2540-0000-000N0UV230G CXB2540-0000-000N0BX265E CXB2540-0000-000N0UV240H CXB2540-0000-
000N0HW465E CXB2540-0000-000N0HX250G CXB2540-0000-000N0UU427G CXB2540-0000-000N0HW240H
CXB2540-0000-000N0HW235G CXB2540-0000-000N0UV435H CXB2540-0000-000N0UV440G CXB2540-0000-
000N0BW465E CXB2540-0000-000N0UU227H CXB2540-0000-000N0UU227G CXB2540-0000-000N0HX250E
CXB2540-0000-000N0HX257E CXB2540-0000-000N0HW230H CXB2540-0000-000N0UV435G CXB2540-0000-
000N0BX240E CXB2540-0000-000N0HW230G CXB2540-0000-000N0HV430G CXB2540-0000-000N0UU430U
CXB2540-0000-000N0UU430Q CXB2540-0000-000N0UV230U CXB2540-0000-000N0UU230U CXB2540-0000-
000N0UV230Q CXB2540-0000-000N0HW440G CXB2540-0000-000N0HW240G CXB2540-0000-000N0HW2L7B
CXB2540-0000-000N0ZU227H CXB2540-0000-000N0ZU230H CXB2540-0000-000N0ZU2L7C CXB2540-0000-
000N0ZU435H CXB2540-0000-000N0ZU4L5A CXB2540-0000-000N0UU431Q