BOARD LEVEL POWER SEMICONDUCTOR HEAT SINKS 274 & 281 SERIES Material: Aluminum, Black Anodized Standard P/N 274-1AB 274-1ABE-01 274-1ABE-02 274-2AB 274-2ABE-01 274-2ABE-02 274-3AB 274-3ABE-01 274-3ABE-02 281-1AB 281-2AB Height Above PC Board in. (mm) .375 (9.5) .375 (9.5) .375 (9.5) .500 (12.7) .500 (12.7) .500 (12.7) .250 (6.4) .250 (6.4) .250 (6.4) .375 (9.5) .500 (12.7) Low-Cost, Low-Height Wavesolderable Heat Sinks Footprint Dimensions in. (mm) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) .520 (13.2) x .750 (19.1) MECHANICAL DIMENSIONS Mounting Configuration Vert./Horiz. Vertical Vertical Vert./Horiz. Vertical Vertical Vert./Horiz. Vertical Vertical Vertical Vertical NATURAL AND FORCED CONVECTION CHARACTERISTICS 274-XAB-02 281 SERIES Dimensions: in. (mm) 2 Mounting Style Mtg Hole Mtg Hole Mtg Hole Mtg Hole Mtg Hole Mtg Hole Mtg Hole Mtg Hole Mtg Hole Mtg Hole Mtg Hole 274 SERIES 274-XAB-01 274 SERIES Solderable Tab Options No Tab 01 02 No Tab 01 02 No Tab 01 02 No Tab No Tab TO-220 Thermal Performance at Typical Load Natural Forced Convection Convection 56°C @ 2W 8.0°C/W @ 400 LFM 56°C @ 2W 8.0°C/W @ 400 LFM 56°C @ 2W 8.0°C/W @ 400 LFM 50°C @ 2W 7.0°C/W @ 400 LFM 50°C @ 2W 7.0°C/W @ 400 LFM 50°C @ 2W 7.0°C/W @ 400 LFM 62°C @ 2W 9.0°C/W @ 400 LFM 62°C @ 2W 9.0°C/W @ 400 LFM 62°C @ 2W 9.0°C/W @ 400 LFM 56°C @ 2W 8.0°C/W @ 400 LFM 50°C @ 2W 7.0°C/W @ 400 LFM 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]