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Ray pinmap.json: symbol pin 4 (Tab/Heatsink) lands on pad 2. On a DPAK the tab IS the middle lead, so the footprint gives i… e87bf03
{
 "schema": "adom.pads/1",
 "slug": "mc78m15cdtrkg",
 "footprint": "TO-252-2",
 "generated_from": {
  "footprint": "TO-252-2@sha256:18c28e5e147d5e9b",
  "pins": "page.json:component.pins",
  "overrides": "pinmap.json"
 },
 "pin1": {
  "pad": "1",
  "at": [
   -5.04,
   -2.28
  ],
  "corner": "top-left",
  "source": "silk-marker",
  "derived_from": "TO-252-2@sha256:18c28e5e147d5e9b"
 },
 "pad_count": 3,
 "symbol_pins": [
  "1",
  "2",
  "3",
  "4"
 ],
 "paste_apertures": 4,
 "issues": [],
 "pads": [
  {
   "pad": "1",
   "kind": "smd",
   "shape": "roundrect",
   "at": [
    -5.04,
    -2.28
   ],
   "rot": 0.0,
   "size": [
    2.2,
    1.2
   ],
   "layers": [
    "F.Cu",
    "F.Mask",
    "F.Paste"
   ],
   "thermal": false,
   "pin": "1",
   "name": "Input",
   "type": "power_in",
   "description": "Unregulated DC input, VI. Recommended operating range up to 35 V (absolute max 35 V; 40 V for short 20-24 V transient conditions). For the +15 V variant, VI must exceed VO by ~2 V dropout (typ 17.5 V min).",
   "is_pin1": true,
   "source": {
    "geometry": "TO-252-2.kicad_mod",
    "meaning": "page.json:component.pins",
    "correspondence": "kicad: symbol pin number == pad name"
   }
  },
  {
   "pad": "2",
   "kind": "smd",
   "shape": "roundrect",
   "at": [
    1.26,
    0.0
   ],
   "rot": 0.0,
   "size": [
    6.4,
    5.8
   ],
   "layers": [
    "F.Cu",
    "F.Mask"
   ],
   "thermal": false,
   "pin": "4",
   "name": "Tab/Heatsink",
   "type": "passive",
   "description": "Exposed thermal pad (heatsink tab) shown as terminal 4 in the DPAK case outline drawing. Internally connected to Pin 2 (Ground). Solder to a copper ground pour for heat dissipation.",
   "is_pin1": false,
   "source": {
    "geometry": "TO-252-2.kicad_mod",
    "meaning": "page.json:component.pins",
    "correspondence": "pinmap.json (declared)"
   }
  },
  {
   "pad": "3",
   "kind": "smd",
   "shape": "roundrect",
   "at": [
    -5.04,
    2.28
   ],
   "rot": 0.0,
   "size": [
    2.2,
    1.2
   ],
   "layers": [
    "F.Cu",
    "F.Mask",
    "F.Paste"
   ],
   "thermal": false,
   "pin": "3",
   "name": "Output",
   "type": "power_out",
   "description": "Regulated +15 V output (14.4 V to 15.6 V over line/load/temperature; 15.0 V typ). Rated 500 mA continuous with adequate heatsinking; short-circuit current limit 350 mA typ; peak output current 700 mA typ.",
   "is_pin1": false,
   "source": {
    "geometry": "TO-252-2.kicad_mod",
    "meaning": "page.json:component.pins",
    "correspondence": "kicad: symbol pin number == pad name"
   }
  }
 ]
}