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WA-T247-101E-ND

WA-T247-101E-ND

Product catalog summary

Overview: The document provides technical specifications and features of the W Series heatsinks designed for TO-220, TO-247, and TO-264 devices by Ohmite Manufacturing Company. These heatsinks are engineered to enhance thermal performance and reliability in electronic applications.

Specifications:

Material: The heatsinks are made from aluminum alloy 6063-T5 or equivalent, with a spring clip made from music wire per ASTM A228.
Thermal Resistance: The thermal resistance varies by model, with values such as Rs-a=12°C/W for WA-T220-101E and Rs-a=7°C/W for WA-DT2-101E under natural convection at 10W heat dissipation.
Dimensions: The document provides detailed dimensions for each heatsink model, ensuring compatibility with specific device packages.

Features:

Reduced Assembly Cost: The integrated spring clip and auto-align feature eliminate the need for additional fasteners and fixtures.
Maximum Repeatability: The clamping force of the spring clip remains consistent even after repeated use.
Enhanced Heat Transfer: The design maximizes surface area per unit volume, reducing thermal resistance.
Shock and Vibration Resistance: The lightweight, resilient spring clip secures components and withstands shock and vibration.
Reliability: The design prevents short circuits by eliminating metal particles from thread tapping.
Compliance: The heatsinks are RoHS compliant.

Recommendations: For improved thermal performance, the use of thermal joint compounds or Grafoil (TGon 800 by Laird) is suggested. For electrical isolation, Sil-Pad 900S by Bergquist or equivalent is recommended.

Additional Information: The document includes a patent-pending design for the heatsinks, emphasizing their innovative approach to thermal management in electronic devices.

Catalog excerpts

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, TO-247, and TO-264 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. Specifications Heat Sink: Aluminum alloy 6063T5 or equivalent. Spring Clip: Music wire, per ASTM A228 Pin: Solderable 100% tin over copper strike Interface thermal resistance: for improvement, use thermal joint compound or 0.005 Grafoil (TGon 800 by Laird) Interface electrical isolation: Sil-Pad 900S by Bergquist or equivalent Mounting: Vertical thru-hole mount Clip Force: 13.2 lbf. Mounting Surface Temp. Rise above Ambient (°C) 4 Air Flow along Fins 4 8 12 Heat Dissipated (watts) Air Flow Side to Side Air Flow along Fins 4 8 12 Heat Dissipated (watts) Part Number Mounting Surface Temp. Rise above Ambient (°C) Air Flow Side to Side land pattern Thermal Resistance from Mounting Surface to Ambient (°C/watts) Patent Pending • Maximum Reliability: helps prevent short circuits by eliminating metal particles from thread tapping • RoHS Compliant • 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 Thermal Resistance from Mounting Surface to Ambient (°C/watts) Description Packaging WA-T220-101E Heat sink for TO-220, black anodized WV-T220-101E Heat sink for TO-220, no finish (degreased) Bulk Bulk WA-T247-101E Heat sink for TO-247, black anodized WV-T247-101E Heat sink for TO-247, no finish (degreased) Bulk Bulk WA-T264-101E Heat sink for TO-264, black anodized WV-T264-101E Heat sink for TO-264, no finish (degreased) Bulk Bulk WA-DT2-101E Heat sink for TO-247 &TO-220, black anodized Bulk WV-DT2-101E Heat sink for TO-247 &TO-220, no finish (degreased) Bulk 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 •

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