WV Series Heatsinks For TO-220 and TO-247 devices T220 0.72" (18.3mm) T247 0.92" (23.4mm) 0.63" (16.0mm) T220 1.20" (30.5mm) T247 1.20-1.26" (30.5-32.0mm) Ohmite Manufacturing has launched a series of heatsink solutions for use with our popular TO-220 and TO-247 power resistors, or similarly packaged semiconductors. These self aligning heatsinks feature solderable feet for through-hole placement, and an integrated clip which provides 13.2 (lbf) of force on the center of the resistor, enhancing thermal performance and reducing parts count and assembly time. S pe c i f i c at i ons Heat Sink: Aluminum alloy 6063T5 or equivalent. Copper alloy C110 or equivalent Spring Clip: Music wire, per ASTM A228 Foot: Cold-rolled steel, per ASTM A366, commercial quality or equivalent Insulator: (optional) Sil-pad 900-S, K6 800-S, and K10, or equivalent Mounting: thru-hole, vertical Suggested Sil Pad: Sil-Pad 900S (Manufactured by Bergquist) Clip Force: 13.2 lbf. 0.14" (3.6mm) T220 0.50" (12.7mm) T247 0.71" (18.0mm) For Heatsink Package Part Number Type WV-T220-101E TO-220 WV-T247-101E TO-247 Ohmite Resistor Series TBH25, TCH35 TEH70 Surface Area Thermal (in2) Weight Resistance* 6.5 0.35 oz/10g Rs-a=10°C/W 8.4 0.42 oz/12g Rs-a=7°C/W *Natural convection WV-T220-101E WV-T247-101E 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] 1