component
UC3842BD
Public Made by Adomby adom
COSINE AC-DC Controllers And Regulators, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+44@@ -0,0 +1,44 @@+# UC3842BD++**COSINE** · AC-DC Controllers And Regulators · SOP-8++UC3842BD from COSINE, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | COMP | output | Output of error amplifier for compensation; connect external compensation components to this pin or externally force to GROUND to command zero duty cycle. |+| 2 | VFB | input | Inverting input to error amplifier, normally connected to switching power supply output through resistor divider. |+| 3 | ISENSE | input | Input for voltage proportional to inductor current to terminate output switch conduction; voltage ramp can be applied for voltage-mode control configuration. |+| 4 | RT/CT | bidirectional | Program oscillator frequency and maximum output duty cycle by connecting resistor RT to VREF and capacitor CT to ground; operation up to 1 MHz is possible. |+| 5 | GROUND | power_in | Ground return pin functioning as both power ground and analog ground. |+| 6 | OUTPUT | output | Output of on-chip drive stage directly driving power MOSFET gate with peak current up to 1 A sourced and sunk; output is actively held low when VCC is below turnon threshold. |+| 7 | VCC | power_in | Power supply pin for control IC (7.6 V to 30 V); bypass with 0.1 µF ceramic low ESL capacitor with minimal trace lengths and additional bypass capacitor at least 10 times greater than gate capacitance of main switching MOSFET. |+| 8 | VREF | power_in | 5 V reference providing charging current for capacitor CT through resistor RT; bypass with 0.1 µF ceramic low ESL capacitor with minimal trace length to ground plane. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | COSINE |+| Package | SOP-8 |+| Category | Power Management (PMIC) |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `UC3842BD`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)+- 3D model files: `uc3842bd-etched.step` / `uc3842bd-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3842bd.step` / `uc3842bd.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [COSINE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603380585087705088) (10 pp, sha256 `60a0f42408f6f9e3`, retrieved 2026-09-21, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/uc3842bd-datasheet.pdf)
page.jsonadded+143@@ -0,0 +1,143 @@+{+ "slug": "uc3842bd",+ "version": "0.1.0",+ "type": "component",+ "description": "COSINE AC-DC Controllers And Regulators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "power management (pmic)",+ "uc3842bd",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "uc3842bd.kicad_sym",+ "uc3842bd.kicad_mod",+ "uc3842bd.glb",+ "uc3842bd.step",+ "uc3842bd.lbr",+ "docs/hero.png",+ "docs/uc3842bd-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ],+ "component": {+ "mpn": "UC3842BD",+ "manufacturer": "COSINE",+ "package": "SOP-8",+ "pin_count": 8,+ "category": "Power Management (PMIC)",+ "subcategory": "AC-DC Controllers And Regulators",+ "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603380585087705088",+ "parts": {+ "symbol": "uc3842bd.kicad_sym",+ "footprint": "uc3842bd.kicad_mod",+ "model_3d": "uc3842bd-etched.glb",+ "model_3d_plain": "uc3842bd.glb",+ "model_3d_step": "uc3842bd-etched.step",+ "model_3d_step_plain": "uc3842bd.step",+ "lbr": "uc3842bd.lbr"+ },+ "distributor_links": {+ "lcsc": "C22458872"+ },+ "pins": [+ {+ "number": "1",+ "name": "COMP",+ "type": "output",+ "description": "Output of error amplifier for compensation; connect external compensation components to this pin or externally force to GROUND to command zero duty cycle."+ },+ {+ "number": "2",+ "name": "VFB",+ "type": "input",+ "description": "Inverting input to error amplifier, normally connected to switching power supply output through resistor divider."+ },+ {+ "number": "3",+ "name": "ISENSE",+ "type": "input",+ "description": "Input for voltage proportional to inductor current to terminate output switch conduction; voltage ramp can be applied for voltage-mode control configuration."+ },+ {+ "number": "4",+ "name": "RT/CT",+ "type": "bidirectional",+ "description": "Program oscillator frequency and maximum output duty cycle by connecting resistor RT to VREF and capacitor CT to ground; operation up to 1 MHz is possible."+ },+ {+ "number": "5",+ "name": "GROUND",+ "type": "power_in",+ "description": "Ground return pin functioning as both power ground and analog ground."+ },+ {+ "number": "6",+ "name": "OUTPUT",+ "type": "output",+ "description": "Output of on-chip drive stage directly driving power MOSFET gate with peak current up to 1 A sourced and sunk; output is actively held low when VCC is below turnon threshold."+ },+ {+ "number": "7",+ "name": "VCC",+ "type": "power_in",+ "description": "Power supply pin for control IC (7.6 V to 30 V); bypass with 0.1 µF ceramic low ESL capacitor with minimal trace lengths and additional bypass capacitor at least 10 times greater than gate capacitance of main switching MOSFET."+ },+ {+ "number": "8",+ "name": "VREF",+ "type": "power_in",+ "description": "5 V reference providing charging current for capacitor CT through resistor RT; bypass with 0.1 µF ceramic low ESL capacitor with minimal trace length to ground plane."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.2",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.2",+ "primary_model": "claude-haiku-4-5-20251001",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-4-6",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "1/8 pin names appear NOWHERE in the datasheet text: ['5:GROUND@p2']"+ ],+ "pages_sent": 10,+ "cost_usd": 0.0992,+ "at": "2026-09-21T23:35:28"+ },+ "datasheet": {+ "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603380585087705088",+ "pages": 10,+ "sha256": "60a0f42408f6f9e3",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 8,+ "described": 8,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}