CR401-25AE
Heat Sink, 5.4 °C/W, TO-247, TO-264, 40 mm, 75 mm, 25 mm
- Manufacturer: OHMITE
- Product type: Natural Convection Heat Sinks
- SVHC: No SVHC (15-Jan-2018)
- Product Range: CR Series
- Packages Cooled: TO-247, TO-264
- Heat Sink Material: Aluminium Alloy
- Thermal Resistance: 5.4°C/W
- External Width - Metric: 40mm
- External Height - Metric: 75mm
- External Length - Metric: 25mm
- External Width - Imperial: 1.57"
- External Diameter - Metric: -
- External Height - Imperial: 2.95"
- External Length - Imperial: 0.98"
- External Diameter - Imperial: -
| Delivery and price | |
|---|---|
| Units per pack | 100 |
| Price | 3.09 € |
| Current stock | 10+ |
| Lead time | 30 days |
## **CR Series Heatsink with universal cam-clip** ## **F E A T U R E S** - **Minimum assembly cost and labor:** Spring Clips make the mounting holes, fasteners, tools and fixtures obsolete in assembly operations & reduce costs. Ohmite introduces the CR-series, configurable and patented (Pat. Pending) high performance, heatsinks with universal cam-clip for TO-247, TO-264, and other packages. This proprietary heat sink provides tool and fixture free assembly operation with its Pat Pending cam clip system. The CR series heatsinks are comparable to some AAVID popular MAX-clip heat sinks in footprint and thermal performance. It is the ideal type of heat sink for high power density and small size electronic packaging with forced convec tion cooling. - **Maximum Repeatability:** Constant spring force over repeated assembly/disassembly - **Maximum Reliability:** Resilient spring action locks electronic component in place. Fewer parts in assembly and no fasteners and washers required. Prevent short circuit by eliminating metal particles generated from hardware or thread tapping - Design Flexibility: Maximum flexibility for dynamic device locations and power up grading. “Configureto-Fit” gives designers total freedom to configure heat sink needed to fit their dynamic design environments. ~~**S E R i E S S P E C i F i C AT i O N S** es~~ |**Heatsink**<br>**Part Number**|**Surface**<br>**Area**<br>**(in2/mm2)**|**Weight**<br>**(oz/g)**|**Length Resistance***<br>**(mm)**|**Thermal**<br>**Length Resistance***<br>**(°C/W)**| |---|---|---|---|---| |CR101-25|20 / 12,785|1.0 / 28|25|7.6| |CR101-50|40 / 25,570|2.0 / 57|50|5.3| |CR101-75|60 / 38,355|3.0 / 85|75|4.2| |CR201-25|36.8 / 23,705|1.8 / 52|25|4.7| |CR201-50|73.5 / 47,409|3.6 /103|50|3.3| |CR201-75|110 / 71,114|5.4 /155|75|2.6| |CR301-25|19.5 / 12,595|1.38 /39|25|8.1| |CR301-50|39.0 / 25,189|2.75 /78|50|5.7| |CR301-75|58.5 / 37,784|4.12/117|75|4.5| |CR401-25|31.7 / 20,477|2.26/63.5|25|5.4| |CR401-50|63.5 / 40,954|4.48/127|50|3.8| |CR401-75|95.2 / 61,431|6.74/191|75|3.0| *Natural convection thermal resistance based on 70 °C Temp rise above ambient. ## ~~ee~~ ~~**h O w T O O R d E R**~~ **==> picture [271 x 53] intentionally omitted <==** **----- Start of picture text -----**<br> RoHS Compliant<br>1<br>C R 1 0 1 - 2 5 - A E C L A - T O - 2 1 E<br>:e s i s | e s<br>Series Extrusion style Length (mm) Coating Cam Clip<br>101, 201,301,401 25, 50, 75 A = Anodized ordered separately<br>V = degreased<br>**----- End of picture text -----**<br> ## ~~**C h A R A C T E R i S T i C S**~~ | ~~ee~~ **Heat Sink** Aluminum Alloy 6063-T5 or Equivalent with either degreased or black anodized finish. **Spring Clip** Music Wire, Per ASTM A228 with bright nickel plating **Solder Foot** Cold-rolled Steel, Per ASTM A-366 with pure tin over copper strike. RoHS compliant. **Insulator** (Optional) Sil-Pad 900-S, K6 800-S and K10 ## **Thermal Performance** **==> picture [158 x 144] intentionally omitted <==** **----- Start of picture text -----**<br> 2.75<br>2.5<br>2.25<br>2.0<br>1.75<br>1.5 CR101<br>CR301<br>1.25<br>1.0<br>0.75 CR401<br>0.5 CR201<br>0.25<br>0 200 400 600 800 1000 1200<br>Air Velocity (ft./min.)<br>Thermal Resistance (°C/W)<br>**----- End of picture text -----**<br> Two TO-247 heat sources uniformly spaced on the heat Sink, L= 1.97” [50mm] and total of 10W Power Dissipation (continued) **178** 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com ## **CR Series Heatsink with universal cam-clip** ## ~~**d i m E N S i O N S**~~ **==> picture [515 x 604] intentionally omitted <==** **----- Start of picture text -----**<br> 1.06"<br>(27.0mm)<br>Y X<br>Ø0.105"<br>(2.67mm)<br>(27.0mm) 1.06" 0.18" (4.5mm) CR201<br>0.67"<br>(50mm) 1.97" (17.0mm) 1.34 "<br>(34mm)<br>0.55"<br>0.98" 2x 0.08" (13.995mm) M3<br>(25mm) L (2.0mm)<br>0.89"<br>(22.5mm)<br>Y X<br>0.24" Ø0.105"<br>0.18" (6.025mm) (2.67mm)<br>(4.55mm) 2.95"<br>0.19" (75mm)<br>CR101 1.34" (4.95mm)<br>(34mm)<br>0.91" 1.19"<br>(23.2mm) (30.2mm)<br>1.1"<br>(27.7mm)<br>2x 0.08"<br>(2.0mm)<br>L<br>0.19" 0.23"<br>(4.95mm) (5.778mm)<br>1.18"<br>(30mm)<br>M4X0.7<br>Y X<br>Ø0.105"<br>(2.67mm)<br>CR401<br>CR301<br>1.18" 0.157"<br>(30mm) (4.0mm) 1.57"<br>2.36" (40mm)<br>(60mm) (15mm) 0.59" M3 (2.79mm)Ø0.11"<br>0.24"<br>2x 0.08" (6mm)<br>0.98" L (2.0mm)<br>1.18" (25mm)<br>(30mm)<br>1.08"<br>(27.5mm)<br>Y X Ø0.105" 2.95"<br>(2.67mm) (75mm)<br>0.32"<br>(8mm) 0.157"<br>(4.0mm)<br>1.18" 0.98"<br>0.75" (40mm) 1.57" (30mm) 1.08" (25mm)<br>Clip (19.1mm) 0.197" (27.5mm)<br>0.57" 0.79" (5.0mm)<br>(14.5mm)<br>(20mm) 0.39"<br>(10mm) 0.197"<br>(4.8mm) 0.19" 2x 0.08" (5.0mm)<br>0.78" L (2.0mm)<br>(19.8mm)<br>1.39"<br>(35.3mm)<br>0.43"<br>(10.9mm)<br>**----- End of picture text -----**<br> rev 2/18-1 **==> picture [146 x 41] intentionally omitted <==** 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com **179**
Updated at April 29, 2026
With nearly a century of engineering expertise, Ohmite is a premier manufacturer of high-performance resistive and thermal management products. Founded in 1925, the company has continuously evolved alongside the electronics industry, building a reputation for resolving complex design challenges. Ohmite specializes in delivering reliable solutions for high-current, high-voltage, and high-energy applications across the industrial, medical, aerospace, and transportation sectors. The core of our Ohmite offering centers on their advanced cooling and thermal management solutions, particularly natural convection heat sinks. Engineered to efficiently dissipate thermal energy in demanding environments, these heat sinks help designers overcome critical thermal bottlenecks. By effectively managing heat dissipation, Ohmite's thermal products ensure the optimal performance and extended longevity of sensitive electronic assemblies. Complementing their thermal management expertise, our selection includes precision sensing and circuit protection components. Ohmite's robust force sensors and load cells provide dependable measurement capabilities for specialized industrial applications, while their temperature sensing and compensation NTC thermistors offer accurate environmental monitoring. These product lines reflect Ohmite’s enduring commitment to quality, innovation, and specialized component engineering.
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