PRODUCT FAMILY DATA SHEET
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo,
XLamp® and EasyWhite® are registered trademarks 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-DS166 REV 7B
Cree® XLamp® CMT1945 LED
PRODUCT DESCRIPTION
The Cree XLamp® High-Current
LED Array family is optimized for
best‑in‑class lumen output, efcacy
and reliability at high drive currents.
XLamp CMT LEDs deliver performance
in industry-compatible packages and
LESes, enabling lighting manufacturers
to upgrade their designs for applications
such as track, downlight and outdoor
lighting. XLamp High-Current LED
Arrays are available in 2-step, 3-step
and 5-step EasyWhite® bins.
FEATURES
• 14.5-mm optical source
• Available in 70-, 80- and 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
• Maximum drive current: 2500mA
• 115° viewing angle, uniform
chromaticity profile
• Top-side solder connections
• 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 .................................4
Relative Spectral Power Distribution,
EasyWhite® LEDs .........................................5
Relative Spectral Power Distribution,
Premium Color LEDs ...................................6
Electrical Characteristics ............................8
Relative Luminous Flux ...............................9
Typical Spatial Distribution .........................9
Performance Groups - Chromaticity ....... 10
Premium Color Performance Groups -
Chromaticity ............................................. 11
Cree EasyWhite® Bins Plotted on the
1931 CIE Color Space .............................. 12
Cree Premium Color Bins Plotted on the
1931 CIE Color Space .............................. 13
Bin and Order Code Formats ................... 15
Mechanical Dimensions .......................... 16
Thermal Design ........................................ 17
Notes ........................................................ 18
Packaging ................................................. 19
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
2
XLAMP® CMT1945 LED
CHARACTERISTICS
Characteristics Unit Minimum Typical Maximum
Viewing angle (FWHM) degrees 115
ESD withstand voltage (JEDEC JS-001-2012) V Class 3A
DC forward current mA 2500*
Reverse current mA 0.1
Forward voltage (@ 1200mA, 85°C) V 34.7 38.2
* Refer to the Operating Limits section.
OPERATING LIMITS
The maximum current rating of the CMT1945 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. Either solder pad shown in the Mechanical
Dimensions section on page 16 can be used as 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 140°C to ensure optimal LED lifetime. Please refer to the Thermal Design section on page 14 for more
information on LES temperature measurement.
CMT1945 - Standard
0
250
500
750
1000
1250
1500
1750
2000
2250
2500
2750
025 50 75 100 125 150
If (mA)
Case Temperature (°C)
85 °C, 2500 mA
125 °C,
962 mA
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
3
XLAMP® CMT1945 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).
• 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 CHARACTERISTICS, EASYWHITE® ORDER CODES AND BINS (IF = 1200mA, TJ=85°C)
The following table provides order codes for XLamp CMT1945 LEDs. For a complete description of the order code nomenclature, please
see the Bin and Order Code Formats section (page 15).
Nominal
CCT
CRI Minimum
Luminous
Flux (lm)
Typical
Luminous
Flux (lm)
2-Step 3-Step 5-Step
Min. Typ Group Order Code Group Order Code Group Order Code
6500 K
70 73 6126 6587 65E CMT1945-0000-
000N0B0A65E
80 82 5723 6153 65E CMT1945-0000-
000N0H0A65E
5700 K
70 73 6251 6721 57E CMT1945-0000-
000N0B0A57E
80 82 5839 6279 57E CMT1945-0000-
000N0H0A57E
90 92 4967 5341 57G CMT1945-0000-
000N0U0A57G
5000K
70 73 6070 6526 50E CMT1945-0000-
000N0B0A50E
80 82 5670 6097 50G CMT1945-0000-
000N0H0A50G
90 92 4967 5341 50G CMT1945-0000-
000N0U0A50G
4000K
70 73 6024 6477 40E CMT1945-0000-
000N0B0A40E
80 82 5606 6027 40H CMT1945-0000-
000N0H0A40H 40G CMT1945-0000-
000N0H0A40G
90 92 4827 5190 40H CMT1945-0000-
000N0U0A40H 40G CMT1945-0000-
000N0U0A40G
3500K
80 82 5469 5880 35H CMT1945-0000-
000N0H0A35H 35G CMT1945-0000-
000N0H0A35G
90 92 4694 5047 35H CMT1945-0000-
000N0U0A35H 35G CMT1945-0000-
000N0U0A35G
3000K
70 73 5606 6027 30E CMT1945-0000-
000N0B0A30E
80 82 5310 5710 30H CMT1945-0000-
000N0H0A30H 30G CMT1945-0000-
000N0H0A30G
90 92 4490 4828 30H CMT1945-0000-
000N0U0A30H 30G CMT1945-0000-
000N0U0A30G
2700K
80 82 5095 5479 27H CMT1945-0000-
000N0H0A27H 27G CMT1945-0000-
000N0H0A27G
90 92 4287 4609 27H CMT1945-0000-
000N0U0A27H 27G CMT1945-0000-
000N0U0A27G
2200K 80 82 4490 4828 22G CMT1945-0000-
000N0H0A22G
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
4
XLAMP® CMT1945 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).
• 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 CHARACTERISTICS, PREMIUM COLOR ORDER CODES AND BINS (IF = 1200mA, TJ = 85°C)
Fidelity
Nominal
CCT
CRI* Minimum
Luminous
Flux (lm)
Typical
Luminous
Flux (lm)
2-Step
Min. Typ Group Order Code
4000K 95 98 4323 4648 L5A CMT1945-0000-000N0Z0AL5A
3500K 95 98 4207 4524 35H CMT1945-0000-000N0Z0A35H
3000K 95 98 3934 4230 30H CMT1945-0000-000N0Z0A30H
2700K 95 98 3725 4005 27H CMT1945-0000-000N0Z0A27H
Specialty
Nominal
CCT
CRI Minimum
Luminous
Flux (lm)
Typical
Luminous
Flux (lm)
2-Step 3-Step
Min. Typ Group Order Code Group Order Code Group Order Code
3100K 90 92 4490 4828 31Q CMT1945-0000-
000N0U0A31Q
3000K
80 82 5310 5710 L7B CMT1945-0000-
000N0H0AL7B
90 92 4490 4828 30Q CMT1945-0000-
000N0U0A30Q 30U CMT1945-0000-
000N0U0A30U
95 98 3934 4230 L7C CMT1945-0000-
000N0Z0AL7C
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
5
XLAMP® CMT1945 LED
RELATIVE SPECTRAL POWER DISTRIBUTION, EASYWHITE® LEDS
The following graphs are the result of a series of pulsed measurements at 1200mA and TJ = 85°C.
Relative Spectral Power Distribution
EZW 70 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)
6500 K, 70 CRI
5700 K, 70 CRI
5000 K, 70 CRI
4000 K, 70 CRI
3000 K, 70 CRI
EZW 80 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)
6500 K, 80 CRI
5700 K, 80 CRI
5000 K, 80 CRI
4000 K, 80 CRI
3500 K, 80 CRI
3000 K, 80 CRI
2700 K, 80 CRI
2200 K, 80 CRI
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
6
XLAMP® CMT1945 LED
RELATIVE SPECTRAL POWER DISTRIBUTION, EASYWHITE® LEDS - CONTINUED
RELATIVE SPECTRAL POWER DISTRIBUTION, PREMIUM COLOR LEDS
The following graphs are the result of a series of pulsed measurements at 1200mA and TJ = 85°C.
Fidelity
EZW 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)
5700 K, 90 CRI
5000 K, 90 CRI
4000 K, 90 CRI
3500 K, 90 CRI
3000 K, 90 CRI
2700 K, 90 CRI
Fidelity
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 © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
7
XLAMP® CMT1945 LED
RELATIVE SPECTRAL POWER DISTRIBUTION, PREMIUM COLOR LEDS - CONTINUED
Specialty
Speciality
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
Speciality
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)
30Q, 3000 K, 90 CRI
30U, 3000 K, 90 CRI
L7B, 3000 K, 80 CRI
L7C, 3000 K, Z CRI
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
8
XLAMP® CMT1945 LED
ELECTRICAL CHARACTERISTICS
The following graph is the result of a series of steady-state measurements.
31
32
33
34
35
36
37
38
39
300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500
Voltage (V)
Current (mA)
Tc = 25 °C
Tc = 55 °C
Tc = 85 °C
Tc = 105 °C
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
9
XLAMP® CMT1945 LED
RELATIVE LUMINOUS FLUX
The relative luminous ux values provided below are the ratio of:
• Measurements of CMT1945 at steady-state operation at the given conditions, divided by
• Flux measured during binning, which is a pulsed measurement at 1200mA at TJ = 85°C.
For example, at steady‑state operation of Tc = 55°C, IF = 2100mA, the relative luminous ux ratio is 160% in the chart below. A CMT1945
LED that measures 5710lm during binning will deliver 9136lm (5710 * 1.6) at steady‑state operation of Tc=55°C, IF = 2100mA.
TYPICAL SPATIAL DISTRIBUTION
0%
20%
40%
60%
80%
100%
120%
140%
160%
180%
200%
300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500
Relative Luminous Flux
Current (mA)
Tc = 25 °C
Tc = 55 °C
Tc = 85 °C
Tc = 105 °C
0%
20%
40%
60%
80%
100%
-90 -70 -50 -30 -10 10 30 50 70 90
Relative Luminous Intensity
Angle (º)
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
10
XLAMP® CMT1945 LED
PERFORMANCE GROUPS - CHROMATICITY (TJ = 85°C)
XLamp CMT1945 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
57G 5700K 0.3287 0.3417 0.00738 0.00360 72.0
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
22G 2200K 0.5066 0.4158 0.00980 0.00480 45.5
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
30E 3000K 0.4338 0.4030 0.01390 0.00680 53.2
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
11
XLAMP® CMT1945 LED
PREMIUM COLOR PERFORMANCE GROUPS - CHROMATICITY (TJ = 85°C)
XLamp CMT1945 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 © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
12
XLAMP® CMT1945 LED
CREE EASYWHITE® BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ = 85°C)
2700 K
3000 K
3500 K
4000 K
4500 K
5000 K
5700 K
6500 K
7000K
2450 K 2200 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
0.45
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
0.49
0.50
0.51
0.52
0.53
0.54
CCy
CCx
ANSI C78.377 Quadrangle
EasyWhite 5-step
EasyWhite 3-step
EasyWhite 2-step
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
13
XLAMP® CMT1945 LED
CREE PREMIUM COLOR BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ = 85°C)
Fidelity (2-step)
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 © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
14
XLAMP® CMT1945 LED
CREE PREMIUM COLOR BINS PLOTTED ON THE 1931 CIE COLOR SPACE (TJ = 85°C) - CONTINUED
Speciality (2-step)
Speciality (3-step)
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
CCy
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 © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
15
XLAMP® CMT1945 LED
BIN AND ORDER CODE FORMATS
Bin codes and order codes are congured as follows:
Order Code Bin Code
SSSSSCC-HHHH-HHHGGRNNNNN
Series = CMT19
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 = CMT19
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
0A = Not binned into flux bins
Performance class
order code and bin code headings and diagrams are in a table
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
16
XLAMP® CMT1945 LED
MECHANICAL DIMENSIONS
Dimensions are in mm.
Tolerances unless otherwise specied: ±.13
x° ± 1°
Meaning of LED marking
T1945N = 36-V CMT1945
X1 X2 X3 X4 X5
X1 CCT
1 = 6500K
2 = 5700K
3 = 5000K
5 = 4000K
6 = 3500K
7 = 3000K
8 = 2700K
A = 2200K
X2
M = EasyWhite or
Fidelity LED on the
black-body line
Q = Specialty LED below
the black-body line
U = Specialty LED below
the black-body line
X3 X4 Flux bin
0A = Not binned into ux
bins
X5 CRI
B = 70 CRI min
H = 80 CRI min
U = 90 CRI min
Z = 95 CRI min
Tc measurement point: either the anode or cathode solder pad
SIZE
TITLE
OF
REV.
SHEET
C
DRAWING NO.
DATE
DATE
DATE
CHECK
FINAL PROTECTIVE FINISH
MATERIAL
APPROVED
DRAWN BY
THIRD ANGLE PROJECTION
SCALE
A
B
C
D
123456
6 5 4 3 2 1
A
B
C
D
Phone (919) 313-5300
Fax (919) 313-5558
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
X .5
.XXX .25
.XX .75
.X 1.5
FOR SHEET METAL PARTS ONLY
.XX .25
.XXX .125
X .5
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN
MILLIMETERS AND AFTER FINISH.
TOLERANCE UNLESS SPECIFIED:
SURFACE FINISH:
1.6
ø14.5
±0.2
ø16.0
±0.2
R2.00
5.46
3.19
3.19
5.46
5.46
3.19
5.46
3.19
.90±.15
.55±.1
R.60
R.60
19.00
±0.2
19.00
±0.2
1/28.000
B
2500-00714
CMT19XX MARKETING SPEC
05/08/12D. CRONIN
REVISONS
REV DESCRIPTION BY DATE APP'D
ALL DIMENSIONS ARE .13MM UNLESS OTHERWISE NOTED
Marking 1
T1945: product family (CMT1945)
N:36V Voltage Class
Marking 2
X X CCT (eg. 27.2700K, 30:3000K)
X X : Flux Bin
X :CRI (B:70 H:80, U:90, Z:95
12
34
5
OPTICAL REFERENCE
OPTICAL
REFERENCE
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
17
XLAMP® CMT1945 LED
THERMAL DESIGN
The CMT 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 the CMT 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cation.
There is no need to calculate for TJ inside the package, as the thermal management design process, specically from solder point (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 CMT soldering recommendations and more information on thermal interface
materials (TIM), LES temperature measurement, and connection methods, please refer to the Cree XLamp CM Family LEDs soldering and
handling document.
To keep the CMT1945 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
CMT1945
0.01
0.10
1.00
10.00
100.00
300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500
Maximum R_c-a
Current (mA)
Ta = 25 °C
Ta = 55 °C
Ta = 85 °C
Ta = 105 °C
Copyright © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
18
XLAMP® CMT1945 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 or provided as specications.
Pre-Release Qualication Testing
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. Cree did not perform Room Temperature Operating Life
(RTOL) testing on the CMT1945 LED.
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 rom 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 SVHC Declaration. REACh banned substance information (REACh Article 67) is also available
upon request.
UL® Recognized Component
This product meets the requirements to be considered a UL Recognized Component with 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 © 2017-2020 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree®, the Cree logo, XLamp® and EasyWhite® are registered trademarks of Cree,
Inc. UL® and the UR logo are registered trademarks of UL LLC.
19
XLAMP® CMT1945 LED
PACKAGING
Cree CMT1945 LEDs are packaged in trays of 20. Five trays are sealed in 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
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
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
LABEL WITH CREE BIN CODE,
QUANTITY, LOT # 1.063
7.125
7.625
1.125
R.375