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W Series Heatsinks

W Series Heatsinks

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. These heatsinks are engineered to enhance thermal performance and are compliant with RoHS standards.

Specifications:

Heatsinks are available for different package types: TO-220, TO-247, and TO-264.
Surface area and weight vary by model, with thermal resistance ranging from 7°C/W to 13°C/W under natural convection at 10W heat dissipation.
Constructed from aluminum alloy 6063-T5 or equivalent, with a solderable tin-plated spring clip.
Electrical isolation can be achieved using Sil-Pad 900S or equivalent materials.

Features:

Reduced assembly cost due to the integrated spring clip and auto-align feature, eliminating the need for fasteners and fixtures.
Maximum repeatability with consistent clamping force unaffected by repeated use.
Enhanced heat transfer per unit space due to optimal surface area and mounting force.
High resistance to shock and vibration, ensuring component stability.
Improved reliability by preventing short circuits from metal particles.

Design and Dimensions:

The heatsinks feature a unique design with a patent-pending integral spring clip and extruded aluminum body.
Dimensions are provided for each model, ensuring compatibility with standard through-hole soldering requirements.

Ordering Information:

Part numbers are specified for each model, with options for different coatings such as black anodized, degreased, or Alodine 1500 clear.

Performance Graphs:

Graphs illustrate the relationship between heat dissipation, mounting surface temperature rise, and thermal resistance under varying air velocities.

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. F E AT URES • 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 SERiES SPECIFICATIONS Heatsink For Package Ohmite Resistor Surface Area Thermal Part Number Type Series (in2) Weight Resistance* ’Natural convection at 10W heat dissipation Heat Sink Aluminum alloy 6063-T5 or equivalent. Spring Clip Music wire, per ASTM A228 Pin Solderable 100% tin over copper strike Interface thermal for improvement, use thermal joint com-resistance pound or 0.005 Grafoil (TGon 800 by Laird) Interface electrical Sil-Pad 900S by Bergquist or equivalent isolation Mounting Vertical thru-hole mount Clip Force 13.2 lbf. 180 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite

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Heat Dissipation Thermal Resistance from Mounting Surface to Ambient (1C/watts) Heat Dissipated (watts) Land pattern ORDERING INFORMATION Series Coating Device A- Black Anodized size V- degreased N- Alodine 1500 Clear Package RoHS modifier Compliant WA-T220-101E WV-T220-101E WA-T247-101E WV-T247-101E 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected] 181

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All Ohmite catalogs and technical brochures

Archived catalogs

Ohmite Catalog Revised October 26, 2011
118 Pages
General catalog
101 Pages