Adom Custom Electronic Load

@@ -0,0 +1,43 @@+{+  "status": "screen-only-not-adopted",+  "source": "https://wakefieldthermal.com/content/catalogs/Thermal_Extrusions_WakefieldThermal-2025.pdf",+  "pdfPage": 9,+  "printedPage": 5,+  "ambientC": 40,+  "q1HeatW": 5.5,+  "caseLimitC": 55,+  "assumedInterfaceAndSpreadingCPerW": 0.52731,+  "maximumSinkCPerW": 2.199962727272727,+  "rows": [+    {+      "stockMpn": "125301",+      "assumedCutLengthMm": 76.2,+      "widthMm": 71.11999999999999,+      "heightMm": 31.75,+      "catalogNaturalCPerW": 2.9,+      "conditionalCaseC": 58.850205+    },+    {+      "stockMpn": "125313",+      "assumedCutLengthMm": 76.2,+      "widthMm": 73.02499999999999,+      "heightMm": 33.324799999999996,+      "catalogNaturalCPerW": 2.3,+      "conditionalCaseC": 55.550205+    },+    {+      "stockMpn": "125319",+      "assumedCutLengthMm": 76.2,+      "widthMm": 76.0984,+      "heightMm": 50.8,+      "catalogNaturalCPerW": 1.5,+      "conditionalCaseC": 51.150205+    }+  ],+  "limits": [+    "Catalog values refer to three-inch natural-convection specimens; operating rise, orientation and installation conditions are not fully specified.",+    "Existing interface/spreading assumption has not been established for these extrusions.",+    "No mounting, fan obstruction, price, final machining or assembly qualification.",+    "No formal spec, board, thermal gate or BOM changes."+  ]+}

@@ -0,0 +1,13 @@+# Passive cooling alternative screen++With the existing 5.5 W Q1 guard, 40 C ambient, 55 C case limit and provisional 0.52731 C/W interface/spreading budget, the sink must be at most **2.20 C/W**. This is a conditional allocation, not accepted thermal evidence.++Wakefield’s [2025 extrusion catalog](https://wakefieldthermal.com/content/catalogs/Thermal_Extrusions_WakefieldThermal-2025.pdf), printed page 5, gives natural-convection values for **three-inch specimens**, not arbitrary cut lengths:++| Stock extrusion | 76.2 mm cut envelope, W × H | Catalog C/W | Conditional case C |+|---|---|---|---|+| 125301 | 71.12 × 31.75 mm | 2.9 | 58.85 |+| 125313 | 73.025 × 33.325 mm | 2.3 | 55.55 |+| 125319 | 76.098 × 50.8 mm | 1.5 | 51.15 |++The larger option is worth a separate mounting study; it is not a drop-in replacement. A centered full-width base overlaps tall J9/J10 header bounds at the existing sink elevation. Offsetting or raising it changes contact/spreading and carrier geometry. Fan obstruction and the actual low-rise natural-convection performance remain unverified. Do not adopt the catalog number as an installed thermal result. No candidate is ordered or substituted into the BOM.