WIREWOUND SURFACE MOUNT Ohmite has used its thermal management expertise to produce a unique resistor design. The resistor body incorporates fins identical to a heatsink. These fins, as with a heatsink, increase the surface area of the part and allow for greater power dissipation. This unique design allows a small footprint for the SMD device and a high power dissipation. These 5 and 7 watt resistors are extremely stable with a load life drift of only 1%. A special flat has been designed in to the part for pick and place operations. High Power SMD Wirewound Resistors 5 and 7 watt F e at u r e s • Finned design facilitates cooling • High Power Density • Wide Resistance Range • Tight Tolerance • Low TCR Temperature Coefficient Operating temp. range 100 Percent Rated Power Max. working voltage Weight 5.67g P e rf o r m a n c e D ATA Temp. cycle (-55°C to 125°C, 1000 cycles) Load Life (1000 hours at 25°C) Immersion (260°C for 10 sec.) Leaching (260°C Solder immersion, 60 sec.) Thermal Shock (Units at -55°C, then rated power applied) ±1.0%+.05Ω ±0.1%+.05Ω No visible leaching No mechanical damage UL94V0 Flammability UL Material rating 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]

WIREWOUND SURFACE MOUNT High Power SMD Wirewound Resistors 5 and 7 watt dimensions Overall Dimensions Reel Outer Diameter Reel Width Tape Width Power Rating and Temperature Rise data based on the recommended Land Patterns using 10 oz. copper PCB. FR-4 material. 0.062" thick. 4 layer. Component type R = resistor Type of Base S = standard Package FA = 5W FB = 7W Package Modifier A, B sequential T = Tape and Reel (optional) 5W=300/reel 7W=250/reel E = RoHS compliant Resistance Value R = Decimal Examples: K = 1,000 R249 = 0.249 ohms M = 1,000,000 24R9 = 24.9 ohms 2K49 = 2,490 ohms Part Number Component...