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| Part Number: | 421F | 
| Category: | Fans, Thermal Management | 
| Subcategory: | Thermal - Heat Sinks | 
| Manufacturer: | Wakefield-Vette | 
| Packaging: | Bulk | 
| Product Status: | Active | 
| Type: | Board Level, Extrusion | 
| Package Cooled: | TO-3, DO-5, Stud Mount | 
| Attachment Method: | Press Fit | 
| Shape: | Rectangular, Fins | 
| Length: | 3.000" (76.20mm) | 
| Width: | 4.750" (120.65mm) | 
| Diameter: | - | 
| Fin Height: | 2.625" (66.67mm) | 
| Power Dissipation @ Temperature Rise: | 50.0W @ 58°C | 
| Thermal Resistance @ Forced Air Flow: | 0.70°C/W @ 250 LFM | 
| Thermal Resistance @ Natural: | 1.16°C/W | 
| Material: | Aluminum | 
| Material Finish: | Black Anodized |