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HSE-B20635-035H-01
HEAT SINK EXTRUSION 63.5 X 25 X 12.7 MM
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: SAME SKY
- Product type: Natural Convection Heat Sinks
- SVHC: No SVHC (04-Feb-2026)
| Delivery and price | |
|---|---|
| Units per pack | 1200 |
| Price | 3.07 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
CUI Devices is now Same Sky! Learn More **date** 09/12/2024 **page** 1 of 5 Additional Resources: Product Page ## **SERIES:** HSE-BX-035H-02 | **DESCRIPTION:** HEAT SINK ## **FEATURES** - TO-220 package - placement pins for secure PCB attachment - round hole for component attachment - multiple available cut lengths |**MODEL**|||**thermal resistance**|**thermal resistance1**||**power**<br>**dissipation1**| |---|---|---|---|---|---|---| ||**length**|**@ 75**°**C**Δ**T, nat**|**@ 1 W,**|**@ 1 W,**|**@ 1 W,**|**@ 75°C**Δ**T, nat**| |||**conv**(°C/W)|**nat conv**|**200 LFM**|**400 LFM**|**conv**| ||(mm)||(°C/W)|(°C/W)|(°C/W)|(W)| |HSE-B20254-035H-02|25.4|13.64|15.97|4.39|3.27|5.50| |HSE-B20381-035H-02|38.1|10.87|13.97|3.32|2.14|6.90| |HSE-B20508-035H-01|50.8|9.15|13.03|4.76|3.21|8.20| |HSE-B20635-035H-01|63.5|7.98|11.06|4.49|3.31|9.40| ## **MODEL** Note: 1. See performance curves for full thermal resistance details. 2. Custom cut to length options available. Thermal data not available on custom lengths. ## **PERFORMANCE CURVES** ## **HSE-B20254-035H-02** |Mounting Surface Temperature<br>Rise Above Ambient (°C)<br>0<br>10<br>20<br>30<br>40<br>50<br>60<br>70<br>80<br>90<br>100<br>0<br>1<br>2<br>3<br>4<br>5<br>Dissipated Power (W)<br>6<br>7<br>8<br>9<br>10<br>Without Airflow<br>200 LFM<br>400 LFM<br>Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)<br>Power<br>(W)<br>Natural<br>Conv.<br>200 LFM<br>400 LFM<br>0<br>0<br>0<br>0<br>1<br>15.97<br>4.39<br>3.27<br>2<br>31.26<br>8.90<br>6.45<br>3<br>45.86<br>13.39<br>9.63<br>4<br>58.55<br>17.73<br>13.18<br>5<br>70.33<br>21.93<br>16.39<br>6<br>80.76<br>26.48<br>19.66<br>7<br>90.04<br>30.88<br>23.26<br>8<br>97.89<br>35.46<br>26.64<br>9<br>104.05<br>40.56<br>30.58<br>10<br>112.16<br>45.35<br>33.51<br>Ths: “hot spot” temperature measured on the heatsink<br>~~f=~~ Heat<br>~~ee~~<br>|<br>POeer<br>~~ee~~<br>~~a~~<br>4<br>~~———~~<br>TiTTT<br>TATTP TT<br>~~a~~<br>EEREAREER<br>~~a~~<br>He<br>~~ee~~<br>A<br>ere<br>~~ee~~<br>farted<br>~~ee~~| |---| Ths: “hot spot” temperature measured on the heatsink Ta: ambient temperature **sameskydevices.com** Additional Resources: Product Page **SAME SKY** | **SERIES:** HSE-BX-035H-02 | **DESCRIPTION:** HEAT SINK **date** 09/12/2024 | **page** 2 of 5 ## **PERFORMANCE CURVES (CONTINUED)** ## **HSE-B20381-035H-02** ||Heatsink Temperature Rise Above A<br>mbient (ΔT = Ths - Ta) (°C)|Heatsink Temperature Rise Above A<br>mbient (ΔT = Ths - Ta) (°C)|Heatsink Temperature Rise Above A<br>mbient (ΔT = Ths - Ta) (°C)| |---|---|---|---| |Power<br>(W)|Natural<br>Conv.|200 LFM|400 LFM| |0|0|0|0| |1|13.97|3.32|2.14| |2|26.02|7.06|5.29| |3|36.45|10.74|8.06| |4|47.83|14.35|11.12| |5|56.91|18.07|13.94| |6|66.68|21.87|16.57| |7|76.12|25.59|19.23| |8|83.63|29.34|21.97| |9|90.62|33.16|24.05| |10|99.30|36.38|26.25| **==> picture [329 x 212] intentionally omitted <==** **----- Start of picture text -----**<br> 100<br>Without Airflow<br>90<br>200 LFM<br>400 LFM<br>80<br>70<br>60<br>50<br>40<br>30<br>20<br>10<br>0<br>0 1 2 3 4 5 6 7 8 9 10<br>Dissipated Power (W)<br>Rise Above Ambient (°C)<br>Mounting Surface Temperature<br>**----- End of picture text -----**<br> Ths: “hot spot” temperature measured on the heatsink Ta: ambient temperature ## **HSE-B20508-035H-01** ||Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)|Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)|Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)| |---|---|---|---| |Power<br>(W)|Natural<br>Conv.|200 LFM|400 LFM| |0|0|0|0| |1|13.03|4.76|3.21| |2|23.71|9.71|6.44| |3|33.48|14.54|9.72| |4|42.45|19.34|12.99| |5|51.22|24.34|16.17| |6|59.26|29.08|19.43| |7|66.97|33.72|22.66| |8|73.76|38.43|25.87| |9|80.91|43.29|29.05| |10|86.41|48.07|32.37| **==> picture [329 x 178] intentionally omitted <==** **----- Start of picture text -----**<br> 100<br>Without Airflow<br>90<br>200 LFM<br>80 400 LFM<br>70<br>60<br>50<br>40<br>30<br>20<br>10<br>0<br>0 1 2 3 4 5 6 7 8 9 10<br>Heat Dissipated (W)<br>Rise Above Ambient (°C)<br>Mounting Surface Temperature<br>**----- End of picture text -----**<br> Ths: “hot spot” temperature measured on the heatsink Ta: ambient temperature **sameskydevices.com** Additional Resources: Product Page **SAME SKY** | **SERIES:** HSE-BX-035H-02 | **DESCRIPTION:** HEAT SINK **date** 09/12/2024 | **page** 3 of 5 ## **PERFORMANCE CURVES (CONTINUED)** ## **HSE-B20635-035H-01** |Mounting Surface Temperature<br>Rise Above Ambient (°C)<br>0<br>10<br>20<br>30<br>40<br>50<br>60<br>70<br>80<br>90<br>100<br>Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)<br>Power<br>(W)<br>Natural<br>Conv.<br>200 LFM<br>400 LFM<br>0<br>0<br>0<br>0<br>1<br>11.06<br>4.49<br>3.31<br>2<br>20.90<br>9.06<br>6.55<br>3<br>29.15<br>14.11<br>9.89<br>4<br>38.05<br>18.83<br>13.25<br>5<br>45.79<br>23.74<br>16.62<br>6<br>52.98<br>28.44<br>19.99<br>7<br>60.48<br>33.15<br>23.42<br>8<br>67.65<br>38.24<br>26.83<br>9<br>73.09<br>42.81<br>30.28<br>10<br>80.13<br>47.53<br>33.57|Mounting Surface Temperature<br>Rise Above Ambient (°C)<br>0<br>10<br>20<br>30<br>40<br>50<br>60<br>70<br>80<br>90<br>100<br>Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)<br>Power<br>(W)<br>Natural<br>Conv.<br>200 LFM<br>400 LFM<br>0<br>0<br>0<br>0<br>1<br>11.06<br>4.49<br>3.31<br>2<br>20.90<br>9.06<br>6.55<br>3<br>29.15<br>14.11<br>9.89<br>4<br>38.05<br>18.83<br>13.25<br>5<br>45.79<br>23.74<br>16.62<br>6<br>52.98<br>28.44<br>19.99<br>7<br>60.48<br>33.15<br>23.42<br>8<br>67.65<br>38.24<br>26.83<br>9<br>73.09<br>42.81<br>30.28<br>10<br>80.13<br>47.53<br>33.57|Mounting Surface Temperature<br>Rise Above Ambient (°C)<br>0<br>10<br>20<br>30<br>40<br>50<br>60<br>70<br>80<br>90<br>100<br>Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)<br>Power<br>(W)<br>Natural<br>Conv.<br>200 LFM<br>400 LFM<br>0<br>0<br>0<br>0<br>1<br>11.06<br>4.49<br>3.31<br>2<br>20.90<br>9.06<br>6.55<br>3<br>29.15<br>14.11<br>9.89<br>4<br>38.05<br>18.83<br>13.25<br>5<br>45.79<br>23.74<br>16.62<br>6<br>52.98<br>28.44<br>19.99<br>7<br>60.48<br>33.15<br>23.42<br>8<br>67.65<br>38.24<br>26.83<br>9<br>73.09<br>42.81<br>30.28<br>10<br>80.13<br>47.53<br>33.57|Mounting Surface Temperature<br>Rise Above Ambient (°C)<br>0<br>10<br>20<br>30<br>40<br>50<br>60<br>70<br>80<br>90<br>100<br>Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)<br>Power<br>(W)<br>Natural<br>Conv.<br>200 LFM<br>400 LFM<br>0<br>0<br>0<br>0<br>1<br>11.06<br>4.49<br>3.31<br>2<br>20.90<br>9.06<br>6.55<br>3<br>29.15<br>14.11<br>9.89<br>4<br>38.05<br>18.83<br>13.25<br>5<br>45.79<br>23.74<br>16.62<br>6<br>52.98<br>28.44<br>19.99<br>7<br>60.48<br>33.15<br>23.42<br>8<br>67.65<br>38.24<br>26.83<br>9<br>73.09<br>42.81<br>30.28<br>10<br>80.13<br>47.53<br>33.57|||||||ow|ow||||||||||||||| |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| ||||||||With<br>|out<br>|Airfl|ow|||||||||||||||| ||Heatsink Temperature Rise Above<br>Ambient (ΔT = Ths - Ta) (°C)||||||200<br>400|LFM<br>LFM|||||||||||||||||| |Power<br>(W)|Natural<br>Conv.|200 LFM|400 LFM||||||||||||||||||||||| ||||||||||||||||||||||||||| |0|0|0|0||||||||||||||||||||||| ||||||||||||||||||||||||||| |1|11.06|4.49|3.31||||||||||||||||||||||| |2|20.90|9.06|6.55||||||||||||||||||||||| |3|29.15|14.11|9.89||||||||||||||||||||||| |4|38.05|18.83|13.25||||||||||||||||||||||| ||||||||||||||||||||||||||| |5|45.79|23.74|16.62||||||||||||||||||||||| |6|52.98|28.44|19.99||||||||||||||||||||||| |7|60.48|33.15|23.42||||||||||||||||||||||| |8|67.65|38.24|26.83||||||||||||||||||||||| |9|73.09|42.81|30.28||||||||||||||||||||||| |10|80.13|47.53|33.57||||||||||||||||||||||| Ths: “hot spot” temperature measured on the heatsink Ta: ambient temperature **sameskydevices.com** Additional Resources: Product Page **SAME SKY** | **SERIES:** HSE-BX-035H-02 | **DESCRIPTION:** HEAT SINK **date** 09/12/2024 | **page** 4 of 5 ## **MECHANICAL DRAWING** units: mm tolerance: ±0.5 mm |MATERIAL|AL 6063-T5| |---|---| |FINISH|black anodized| |PIN MATERIAL|steel| |PIN PLATING|tin| **==> picture [113 x 42] intentionally omitted <==** **==> picture [174 x 124] intentionally omitted <==** **----- Start of picture text -----**<br> *<br>*<br>L<br>**----- End of picture text -----**<br> |**MODEL NO.**|**LENGTH, L**<br>**(mm)**|**WEIGHT**<br>**(g)**| |---|---|---| |HSE-B20254-035H-02*|25.4|11.33| |HSE-B20381-035H-02|38.1|16.67| |HSE-B20508-035H-01|50.8|22.22| |HSE-B20635-035H-01|63.5|27.5| Note: * Mounting holes not present on 25.4 mm length model. **sameskydevices.com** Additional Resources: Product Page **SAME SKY** | **SERIES:** HSE-BX-035H-02 | **DESCRIPTION:** HEAT SINK **date** 09/12/2024 | **page** 5 of 5 ## **REVISION HISTORY** |**rev.**|**description**|**date**| |---|---|---| |1.0|initial release|05/04/2017| |1.01|updated datasheet|09/11/2017| |1.02|brand update|02/11/2020| |1.03|logo, datasheet style update|08/05/2022| |1.04|CUI Devices rebranded to Same Sky|09/12/2024| The revision history provided is for informational purposes only and is believed to be accurate. Same Sky offers a one (1) year limited warranty. Complete warranty information is listed on our website. Same Sky reserves the right to make changes to the product at any time without notice. Information provided by Same Sky is believed to be accurate and reliable. However, no responsibility is assumed by Same Sky for its use, nor for any infringements of patents or other rights of third parties which may result from its use. Same Sky products are not authorized or warranted for use as critical components in equipment that requires an extremely high level of reliability. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. **sameskydevices.com**
Updated at April 29, 2026
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