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

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