W Series Heatsinks 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. For TO-220 and TO-247 devices T220 0.72" (18.3mm) T247 0.92" (23.4mm) 0.63" (16.0mm) Features T220 1.20" (30.5mm) T247 1.20-1.26" (30.5-32.0mm) 0.14" (3.6mm) T220 0.50" (12.7mm) T247 0.71" (18.0mm) Patent Pending Pin diameter 0.06" (1.5mm) • 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 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. Heat Dissipation DT2-101E T220-101E and T247-101E 200 For Ohmite Surface HeatsinkPackage Resistor Area Thermal Part NumberType Series (in2) Weight Resistance* WA-T220-101E TO-220 TBH25, TCH35 6.5 0.35 oz/10g Rs-a=12°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=11°C/W WV-T247-101E Rs-a=12°C/W WA-DT2-101E TO-220 TBH25, TCH35, 15.1 0.79 oz/22g Rs-a=7°C/W WV-DT2-101E & TO-247TEH70, TEH100 Rs-a=8°C/W *Natural convection at 10W heat dissipation Mounting Surface Temp. Rise above Ambient (°C) 250 CL 0.06" (1.5mm) 0.27" 0.18" (6.9mm) (4.6mm) 8 6 100 Free Air 4 Air Flow along Fins 50 2 0 2 0.63" (16.0mm) 0.28" (16mm) 0.79" (20.1mm) 20 200 400 600 800 1000 12 DT2-101E 120 Air Flow Side to Side 100 10 Free Air 8 80 6 60 Air Flow along Fins 40 4 2 20 0 0 0.08" (2.0mm) 0.89" (22.6mm) 16 Air Velocity (ft./min.) 100 0.711" (18.1mm) CL 4 12 8 Heat Dissipated (watts) 0 1.71" (43.4mm) 0.18" (4.6mm) 72 12 140 Mounting Surface Temp. Rise above Ambient (°C) ø 0.080" (2.0mm) 0.59" (15mm) T220-101E T247-101E 10 DT2-101E ø 0.050" (1.3mm) 0.72" 0.500" (18.3mm) (12.7mm) 0.711" T247 0.92" (23.4mm) (18.1mm) ø 0.050" typ. (1.3mm) 1000 14 150 0 T220 DT2 800 0 0.63" (16.0mm) 0.08" (2.0mm) 0.500" (12.7mm) 600 Air Flow Side to Side 200 land pattern ø 0.080" (2.0mm) Air Velocity (ft./min.) 400 Thermal Resistance from Mounting Surface to Ambient (°C/watts) T247-101E Thermal Resistance from Mounting Surface to Ambient (°C/watts) T220-101E 2 4 8 12 Heat Dissipated (watts) 16 20 S ta n d a r d pa rt n u m b e r s F o r W S e r i e s Part Number DescriptionPackaging WA-T220-101E WV-T220-101E Heat sink for TO-220, black anodized Heat sink for TO-220, degreased Bulk Bulk WA-T247-101E WV-T247-101E Heat sink for TO-247, black anodized Heat sink for TO-247, degreased Bulk Bulk WA-DT2-101E WV-DT2-101E Heat sink for TO-247 &TO-220, black anodized Bulk Heat sink for TO-247 &TO-220 , degreased Bulk Ohmite Mfg. Co. 1600 Golf Rd., Rolling Meadows, IL 60008 • 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]