← Commit history

page.json: fold the "TAB" entry into pin 2. On TO-252-2 the tab is not a separate pad - it is that lead - so nothing was ever unconnected, but the page listed it as its own pin and pads.json reported pin-not-in-symbol for a pin that cannot exist. Target chosen because net VOUT matches pin 2; the tab's description is merged into that pin rather than dropped.

Ray ·a63b7545f6 · ·parent 72ab285
2 files changed +4−17
pads.json+2−9
@@ -24,14 +24,7 @@   "3"  ],  "paste_apertures": 4,- "issues": [-  {-   "kind": "pin-not-in-symbol",-   "pin": "TAB",-   "name": "VOUT",-   "detail": "page.json describes pin \"TAB\" (VOUT) from the datasheet, but the symbol has no such pin, so nothing can connect to it"-  }- ],+ "issues": [],  "pads": [   {    "pad": "1",@@ -84,7 +77,7 @@    "pin": "2",    "name": "VOUT",    "type": "power_out",-   "description": "Regulated 3.3V output (Typ 3.3V, ±1% initial accuracy, ±1.5% over temperature). Rated for ≥1A load current with 1.35A typical current limit. Requires a minimum 10µF low-ESR (<20Ω) ceramic capacitor to ground for stability.",+   "description": "Regulated 3.3V output (Typ 3.3V, ±1% initial accuracy, ±1.5% over temperature). Rated for ≥1A load current with 1.35A typical current limit. Requires a minimum 10µF low-ESR (<20Ω) ceramic capacitor to ground for stability. Also the package tab: exposed thermal tab, electrically connected to VOUT (pin 2). Provides the primary heat conduction path to the PCB copper - thermal resistance θ_JA drops from 100°C/W (no heatsink) to 70°C/W (soldered to 100mm² 2oz copper, 8×0.5mm vias). Solder to a copper pour that is also the V_OUT net.",    "is_pin1": false,    "source": {     "geometry": "TO-252-2.kicad_mod",
page.json+2−8
@@ -15,7 +15,7 @@     "mpn": "AZ1117ID-3.3TRG1",     "manufacturer": "Diodes Incorporated AZ1117ID 3 3TRG1",     "package": "TO-252-2",-    "pin_count": 4,+    "pin_count": 3,     "category": "PMIC",     "subcategory": "Voltage Regulators - Linear, Low Drop Out (LDO) Regulators",     "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2111301930_Diodes-Incorporated-AZ1117ID-3-3TRG1_C2926306.pdf",@@ -40,19 +40,13 @@         "number": "2",         "name": "VOUT",         "type": "power_out",-        "description": "Regulated 3.3V output (Typ 3.3V, \u00b11% initial accuracy, \u00b11.5% over temperature). Rated for \u22651A load current with 1.35A typical current limit. Requires a minimum 10\u00b5F low-ESR (<20\u03a9) ceramic capacitor to ground for stability."+        "description": "Regulated 3.3V output (Typ 3.3V, \u00b11% initial accuracy, \u00b11.5% over temperature). Rated for \u22651A load current with 1.35A typical current limit. Requires a minimum 10\u00b5F low-ESR (<20\u03a9) ceramic capacitor to ground for stability. Also the package tab: exposed thermal tab, electrically connected to VOUT (pin 2). Provides the primary heat conduction path to the PCB copper - thermal resistance \u03b8_JA drops from 100\u00b0C/W (no heatsink) to 70\u00b0C/W (soldered to 100mm\u00b2 2oz copper, 8\u00d70.5mm vias). Solder to a copper pour that is also the V_OUT net."       },       {         "number": "3",         "name": "VIN",         "type": "power_in",         "description": "Unregulated input supply. Recommended operating range is up to 15V; absolute maximum is 18V. For 3.3V output, V_IN must exceed V_OUT by the dropout voltage (typ 1.3V, max 1.4V on TO252-2 at I_OUT = 0.8A). Bypass with \u226510\u00b5F capacitor to ground."-      },-      {-        "number": "TAB",-        "name": "VOUT",-        "type": "power_out",-        "description": "Exposed thermal tab, electrically connected to VOUT (pin 2). Provides the primary heat conduction path to the PCB copper - thermal resistance \u03b8_JA drops from 100\u00b0C/W (no heatsink) to 70\u00b0C/W (soldered to 100mm\u00b2 2oz copper, 8\u00d70.5mm vias). Solder to a copper pour that is also the V_OUT net."       }     ],     "provenance": {