W Series Heatsinks
For TO-220 and TO-247 devices
Patent Pending
| Heatsink Part Number | Package Type | For Ohmite Resistor Series | Surface Area (in2) | Weight | Thermal Resistance* |
| WA-T220-101E | TO-220 | TBH25, TCH35 | 6.5 | 0.35 oz./10g | Rs-a=10°C/W |
| WV-T220-101E | Rs-a=13°C/W |
| WA-T247-101E | TO-247 | TEH70, TEH100 | 8.4 | 0.42 oz./12g | Rs-a=7°C/W |
| WV-T247-101E | Rs-a=9°C/W |
| WA-DT2-101E | TO-220 & TO-247 | TBH25, TCH35, TEH70, TEH100 | 15.1 | 0.79 oz/22g | Rs-a=5°C/W |
| WV-DT2-101E | Rs-a=6°C/W |
*Natural convection
The unique design (patent pending) of the W Series heat sinks combines a tin plated, solderable, integral spring clip with an extruded aluminum heat sink body for an all-in-one solution to through-hole mounting of TO-220 or TO-247 packages. These self-aligning heat sinks feature solderable feet and an integrated clip with 13.2 (lbf) of force on the center of the device to enhance thermal performance.
FEATURES
- Reduced Assembly Cost: spring clip and auto-align feature makes fasteners and fixtures obsolete, along with stray metal filings from tapped holes
- Maximum Repeatability: clamping force of the spring clip is not degraded by repeated loading and unloading
- Maximum Heat Transfer per Unit Space: maximum surface area per unit volume and consistent mounting force reduces thermal resistance
- Maximum Resistance to Shock and Vibration: light weight, resilient spring clip locks the component in place and is highly resistant to shock and vibration
- Maximum Reliability: helps prevent short circuits by eliminating metal particles from thread tapping
- RoHS compliant
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SPECIFICATIONS
Applications Notes: Thermal Performance/Analysis
- Heat Sink: Aluminum alloy 6063-T5 or equivalent.
- Spring Clip: Music wire, per ASTM A228
- Pin: Solderable 100% tin over copper strike
- Suggested Insulator: (optional) Sil-pad 900S (Manufactured by Berquist) or equivalent
- Mounting: Vertical thru-hole mount
- Clip Force: 13.2 lbf.
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LAND PATTERN
HEAT DISSIPATION
STANDARD PART NUMBERS FOR W SERIES
| Part Number | Description | Packaging |
| WA-T220-101E | Heat sink for TO-220, black anodized | Bulk |
| WV-T220-101E | Heat sink for TO-220, degreased | Bulk |
| WA-T247-101E | Heat sink for TO-247, black anodized | Bulk |
| WV-T247-101E | Heat sink for TO-247, degreased | Bulk |
| WA-DT2-101E | Heat sink for TO-247 &TO-220, black anodized | Bulk |
| WV-DT2-101E | Heat sink for TO-247 &TO-220, degreased | Bulk |
 
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Download Datasheet (PDF)