Wakefield Thermal 680-125220 heatsink

Black-anodized aluminum bolt-on heatsink for two TO-220 packages, nominally 45.974 mm square and 31.75 mm overall height. Manufacturer catalog mass is 49.9 g. The 4.7752 mm base thickness is a reference dimension, not a guaranteed manufacturing tolerance.

The catalog lists 45 C mounting-surface rise at 7.5 W in natural convection and 1.5 C/W at 400 LFM forced airflow. These are catalog test conditions, not a power rating for an arbitrary enclosed assembly. Fan RPM or free-air CFM does not establish installed airflow through this sink.

Asset limitations

The original Adom drawing-led STEP/GLB is incomplete. Outer dimensions, mounting pitch and hole diameters follow the catalog. Fin thickness, angular placement, corner radii and corner-column shape are inferred. Two semiconductor lead-relief apertures, root fillets and manufacturing tolerances are omitted. The modeled mass is about 54.4 g at an assumed 2700 kg/m3 density, versus 49.9 g in the catalog. Do not use this reconstruction to qualify tab contact area, airflow, fastener engagement or fabrication.

The zero-pin schematic symbol records an off-board BOM item. Its zero-pad footprint is an envelope, not a copper land pattern or PCB drill template. The sink is conductive metal; this symbol does not establish electrical isolation. Select the actual insulator, fasteners, preload and independent support separately, and verify electrical and thermal performance physically.

Manufacturer product · Manufacturer drawing, printed page 75

Original Adom library assets are MIT. Manufacturer documents are linked, not redistributed or relicensed. This library remains provisional until exact geometry and assembly use are reviewed.