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D Series Heatsink

D Series Heatsink

Product catalog summary

Overview: The document provides technical specifications and features of the Ohmite D Series heatsinks, designed for TO-252, TO-263, and TO-268 semiconductor devices. These heatsinks offer enhanced thermal management solutions for surface-mount technology (SMT) components.

Key Features:

Increased surface area by three times, improving thermal performance by up to 300% compared to standard aluminum stamped heatsinks.
Lightweight aluminum construction facilitates faster assembly, reducing manufacturing cycle time.
Unique design with radius-mounted 'rollers' to maximize heat transfer and eliminate thermal bottlenecks.
Available in bulk packaging or tape & reel (250 units per reel).
RoHS compliant.

Design and Performance: The D Series heatsinks feature a patent-pending design that combines tin-plated, solderable rods with an aluminum extruded body. This design reduces thermal resistance and eliminates air gaps and thermal bottlenecks common in stamped heatsinks. The heatsinks are specifically designed for TO-252, TO-263, and TO-268 packages, offering superior thermal performance.

Thermal Performance: The document includes graphs showing the relationship between heat dissipation, air velocity, and case temperature rise above ambient. It highlights that thermal performance is highly dependent on the PCB's thermal characteristics, with potential for a 50% reduction in temperature rise with improved PCBs.

Dimensions: Detailed dimensions for each heatsink style (10, 20, 30) and package type (TO-252, TO-263, TO-268) are provided, ensuring compatibility with various device configurations.

Ordering Information: The document lists standard part numbers for the D Series, including options for degreased or black anodized finishes, and packaging in bulk or reel. Part numbers are structured to indicate series, style, length, finish, package type, and compliance.

Land Patterns: Land patterns for D, D2, and D3 styles are provided to assist in PCB layout design.

Catalog excerpts

Ohmite D Series heatsinks provide an innovative solution for SMT compatible semiconductors and resistors. The unique design (Patent Pending) combines tin plated, solderable rods with an aluminum extruded heat sink body. These rods (or “rollers”) are mated mechanically to the heatsink by forging to reduce the thermal resistance between the heatsink body and the solderable feet. Specifically designed for use with the increasingly popular TO-252, TO-263 and TO-268 packages, the D Series affords the user superior thermal performance over the more common stamped aluminum heatsinks. By eliminating the staking joint typically used in stamped heatsinks, the resulting air gap and thermal “bottle-neck” is also eliminated, while surface area for cooling is maximized with the extruded fins of the D Series body. THERMAL MANAGEMENT • Increased surface areas by 3 times therefore thermal performance up to 300% over the aluminum stamped heat sinks on markets • Light weight aluminum construction allows faster pick and place assembly reducing the manufacturing cycle time • Radius mounted “Rollers” are designed for maximizing heat transfer from the component and avoiding the thermal “bottle-neck” seen in stamped and staked heatsinks. • Available in bulk packaging or tape & reel (250 units per reel • RoHS Compliant Case Temp. Rise above Ambient ( C) 55 Case Temp. Rise above Ambient ( C) Thermal Resistance from Mounting Surface to Ambient ( C/watts) 4 6 8 Heat Dissipated (watts) Final thermal performance is highly dependent on the thermal characteristics of the PCB. It is possible to see a 50% drop in temp rise in natural convection with a thermally improved PCB. Thermal Resistance from Mounting Surface to Ambient ( C/watts) 4 6 8 Heat Dissipated (watts) 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]

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THERMAL MANAGEMENT RoHS Compliant Series Finish D A = black anodized V = degreased Tape & Reel Length 1 = 0.50" 2, 3, 4 = optional lengths assigned sequentially on customer request Standard part numbers For D Series ø D0 Removable Kapton tape on each part facilitates handling by automatic pick and place equipment. Style 10 tape and reel only. Part Number pack, pack, pack, pack, degreased black anodized degreased black anodized Bulk Bulk Reel Reel pack, pack, pack, pack, degreased black anodized degreased black anodized Bulk Bulk Reel Reel 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522...

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All Ohmite catalogs and technical brochures

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