Application Note
【Annex】

Thermal Resistance Valuesof the Nichia 121, 131, or 170 Series LEDs

Nichia 121 Series

Light Emitting Diode

Part Number

Thermal ResistanceRθJMP (˚C/W)Part Number

Thermal ResistanceRθJMP (˚C/W)

NC2W121D

2.6

NC2W121D-S1

2.6

NC3W121D

2.0

NC3W121D-S1

2.0

NC4W121D

1.5

NC4W121D-S1

1.5

NC5W121D

1.2

NC5W121D-S1

1.2

NC2W121F

2.5

NC3W121F

1.9

NC4W121F

1.4

NC5W121F

1.2

NC2W121G

2.7

NC2W121G-SC

3.0

Nichia 131 SeriesPart Number

Thermal ResistanceRθJMP (˚C/W)Part NumberThermal ResistanceRθJMP (˚C/W)

NCSA131C

7.0

NCSW131C

5.7

NC2A131C

4.2

NC2W131C

3.4

NCSA131D

7.0

NCSW131D

4.9

NCSW131D-PCA

5.2

NC2A131D

4.2

NC2W131D

2.6

NCSA131F

6.8

NCSB131F

7.0

NCSE131F

8.3

NCSG131F

8.4

NCSR131F

7.2

NCSW131F

4.8

NCSW131F-SA

5.1

NCSY131F

6.8

NC2A131F

4.0

NC2W131F

2.5

NCSA131G

7.2

NCSW131G

5.1

NCSW131G-SA

5.4

NCSW131G-SB

5.6This document contains tentative information, Nichia may change the contents without notice.
SP-QR-C2-210552-8
1/3
Jul. 30, 2024

Application Note
Nichia 170 Series

Light Emitting Diode

Part Number

Thermal ResistanceRθJMP (˚C/W)Part Number

Thermal ResistanceRθJMP (˚C/W)

NCSA170C

7.0

NCSW170C

5.7

NC2A170C

4.2

NC2W170C

3.4

NJSW170C

8.6

NCSA170D

7.0

NCSW170D

4.9

NCSW170D-PCA

5.2

NC2A170D

4.2

NC2W170D

2.6

NJSW170D

7.7

NCSA170F

6.8

NCSB170F

7.0

NCSE170F

8.3

NCSG170F

8.4

NCSR170F

7.2

NCSW170F

4.8

NCSW170F-SA

5.1

NCSY170F

6.8

NC2A170F

4.0

NC2W170F

2.5NJSA170F

9.6

NJSW170F

7.6

NJSW170F-SA

7.7

NCSA170G

7.2

NCSW170G

5.1

NCSW170G-SA

5.4

NCSW170G-SB

5.6

NC2W170G

2.7

NJSA170G

10.7

NJSW170G

7.9

NJSW170G-SA

8.0• The RθJMP is the thermal resistance from the chip of the LED to the measurement point Nichia
specifies (i.e. the TMP measurement point).
(PCB used for the RθJMP measurement: Aluminum-core PCB with a thickness of 1.5mm, Copper
layer thickness: 105μm)• The estimated value of the junction temperature (TJ) of the LED can be calculated by measuringthe TMP (i.e. the temperature of the TMP measurement point) of the LED mounted on a PCB andusing the RθJMP value provided above. For details of how to calculate the TJ, refer to the application
note: How to Calculate the Junction Temperature for the Nichia 121, 131, or 170 Series LEDs.
• RθJMP values are values measured under Nichia’s measurement conditions. The RθJMP values
provided above are the maximum values calculated from the measurement results; these values
should be used for reference purposes only.
• For the LEDs that do not have the RθJMP values provided above, contact a local Nichia sales
representative.

This document contains tentative information, Nichia may change the contents without notice.
SP-QR-C2-210552-8
2/3Jul. 30, 2024

Application NoteDisclaimer
This application note is a controlled document of Nichia Corporation (Nichia) published to provide
technical information/data for reference purposes only. By using this application note, the user
agrees to the following:・ This application note has been prepared solely for reference on the subject matters incorporated
within it and Nichia makes no guarantee that customers will see the same results for their chosenapplication.

Light Emitting Diode・ The information/data contained herein are only typical examples of performances and/orapplications for the product. Nichia does not provide any guarantees or grant any license underor immunity from any intellectual property rights or other rights held by Nichia or third parties.
・ Nichia makes no representation or warranty, express or implied, as to the accuracy, completenessor usefulness of any information contained herein. In addition, Nichia shall not be liable for any
damages or losses arising out of exploiting, using, or downloading or otherwise this document,or any other acts associated with this document.
・ The content of this application note may be changed without any prior or subsequent notice.
・ Copyrights and all other rights regarding the content of this document are reserved by Nichia or
the right holders who have permitted Nichia to use the content. Without prior written consent of
Nichia, republication, reproduction, and/or redistribution of the content of this document in anyform or by any means, whether in whole or in part, including modifications or derivative works
hereof, is strictly prohibited.

491 Oka, Kaminaka-Cho, Anan-Shi,
TOKUSHIMA 774-8601, JAPAN
Phone: +81-884-22-2311 Fax: +81-884-21-0148

NICHIA CORPORATION
http://www.nichia.co.jp

This document contains tentative information, Nichia may change the contents without notice.
SP-QR-C2-210552-8
3/3Jul. 30, 2024