UC3845B

@@ -36,6 +36,20 @@ UC3845B from UMW, in a SOP-8. Pinout and pin descriptions extracted from the man - Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm` - 3D model: SOP-8 (KiCad packages3D, STEP) +## 3D model downloads++Two STEP files. Same geometry, different body top:++| File | Size | Use it when |+|---|---|---|+| [`uc3845b.step`](uc3845b.step) | 122 KB | You want the bare part, or you mark your own boards. |+| [`uc3845b-etched.step`](uc3845b-etched.step) | 2.0 MB | You want the part with `UC3845B` already on it. |++The marking in the etched file is real recessed geometry cut into the solid, not a+texture or a decal: 481 faces against 147 in the bare model. It+survives export, section views, and rendering in any CAD tool, and it drops straight+into KiCad or Fusion with no extra setup.+ ## Provenance  Data extracted from the manufacturer datasheet, not a distributor listing:

@@ -1,6 +1,6 @@ {   "slug": "uc3845b",-  "version": "0.1.0",+  "version": "0.2.0",   "type": "component",   "description": "UMW AC-DC Controllers and Regulators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.",   "tags": [

@@ -4,7 +4,7 @@   "slug": "uc3845b",   "title": "UC3845B",   "brief": "UMW AC-DC Controllers and Regulators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.",-  "version": "0.1.0",+  "version": "0.2.0",   "license": "CC-BY-SA-4.0",   "tags": [     "component",@@ -34,13 +34,13 @@         "number": "1",         "name": "COMP",         "type": "output",-        "description": "Error Amplifier output pin, used for external loop compensation. Typical high output voltage 5-6 V, low output 0.8-1.1 V (with 15 k\u03a9 load)."+        "description": "Error Amplifier output pin, used for external loop compensation. Typical high output voltage 5-6 V, low output 0.8-1.1 V (with 15 kΩ load)."       },       {         "number": "2",         "name": "VFB",         "type": "input",-        "description": "Inverting input of the Error Amplifier. Normally connected to the switching power supply output through a resistor divider; internal reference at 2.5 V (typ). Input bias current -0.1 \u00b5A typ."+        "description": "Inverting input of the Error Amplifier. Normally connected to the switching power supply output through a resistor divider; internal reference at 2.5 V (typ). Input bias current -0.1 µA typ."       },       {         "number": "3",@@ -64,13 +64,13 @@         "number": "6",         "name": "OUT",         "type": "output",-        "description": "Totem-pole gate drive output for an external power MOSFET. Sources/sinks peak currents up to 1 A. VOH \u2248 13-13.5 V, VOL \u2248 0.08-1.4 V depending on load; rise/fall time ~35-45 ns into 1 nF."+        "description": "Totem-pole gate drive output for an external power MOSFET. Sources/sinks peak currents up to 1 A. VOH ≈ 13-13.5 V, VOL ≈ 0.08-1.4 V depending on load; rise/fall time ~35-45 ns into 1 nF."       },       {         "number": "7",         "name": "VCC",         "type": "power_in",-        "description": "Positive supply for the IC. UVLO start threshold 8.4 V typ (7.8-9 V), min operating 7.6 V typ (7-8.2 V) after turn-on. Absolute max 30 V; zener clamp \u2248 30-38 V at 25 mA. Operating supply current 13 mA typ; start-up current 0.5 mA typ."+        "description": "Positive supply for the IC. UVLO start threshold 8.4 V typ (7.8-9 V), min operating 7.6 V typ (7-8.2 V) after turn-on. Absolute max 30 V; zener clamp ≈ 30-38 V at 25 mA. Operating supply current 13 mA typ; start-up current 0.5 mA typ."       },       {         "number": "8",@@ -150,9 +150,9 @@     "docs/hero.png",     "docs/uc3845b-datasheet.pdf",     "viewers/symbol.html",-    "viewers/footprint.html"+    "viewers/footprint.html",+    "pads.json"   ],-  "visibility": {-    "public": true-  }+  "visibility": "public",+  "description": "UMW AC-DC Controllers and Regulators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D." }\ No newline at end of file