component
UC3845D8
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+45@@ -0,0 +1,45 @@+# UC3845D8++**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-8++UC3845D8 from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | COMP | output | Error amplifier compensation pin for external compensation elements; internally current-limited, can be forced to GROUND to control zero duty cycle. |+| 2 | VFB | input | Inverting input to internal error amplifier for controlling power converter voltage feedback loop and stability. |+| 3 | ISENSE | input | Primary-side current sensing input connected to current sense resistor; PWM uses this signal to terminate OUTPUT switch conduction and can accept voltage ramp for voltage-mode control. |+| 4 | RT/CT | bidirectional | Timing pin for fixed-frequency oscillator; connect timing resistor RRT to VREF and timing capacitor CCT to GROUND to set switching frequency. |+| 5 | GROUND | power_in | Analog ground serving as both power ground and signal return; for packages without separate PWRGND, serves dual function as power and analog ground. |+| 6 | OUTPUT | output | Gate driver output for external MOSFET; provides and sinks peak current up to 1A; actively held low when VCC is below turn-on threshold. |+| 7 | VCC | power_in | Analog controller bias supply input; total current is static current plus average OUTPUT current; requires 0.1µF bypass capacitor directly to GROUND with minimum wiring length. |+| 8 | VREF | power_in | 5V precision reference voltage output; provides charging current to oscillator timing capacitor through timing resistor; requires 0.1µF ceramic bypass capacitor to GROUND for stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Power Management (PMIC) |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `UC3845D8`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)+- 3D model files: `uc3845d8-etched.step` / `uc3845d8-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3845d8.step` / `uc3845d8.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/uc3842) (61 pp, sha256 `0f875fd24cbb5fda`, retrieved 2026-10-03, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (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/uc3845d8-datasheet.pdf)
page.jsonadded+159@@ -0,0 +1,159 @@+{+ "slug": "uc3845d8",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments AC-DC Controllers And Regulators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "power management (pmic)",+ "uc3845d8",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "uc3845d8.kicad_sym",+ "uc3845d8.kicad_mod",+ "uc3845d8.glb",+ "uc3845d8.step",+ "uc3845d8.lbr",+ "docs/hero.png",+ "docs/uc3845d8-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "uc3845d8-hero.glb",+ "uc3845d8-hero.overlay.json"+ ],+ "component": {+ "mpn": "UC3845D8",+ "manufacturer": "Texas Instruments",+ "package": "SOIC-8",+ "pin_count": 8,+ "category": "Power Management (PMIC)",+ "subcategory": "AC-DC Controllers And Regulators",+ "datasheet": "https://www.ti.com/cn/lit/gpn/uc3842",+ "parts": {+ "symbol": "uc3845d8.kicad_sym",+ "footprint": "uc3845d8.kicad_mod",+ "model_3d": "uc3845d8-hero.glb",+ "model_3d_plain": "uc3845d8.glb",+ "model_3d_step": "uc3845d8-etched.step",+ "model_3d_step_plain": "uc3845d8.step",+ "lbr": "uc3845d8.lbr"+ },+ "distributor_links": {+ "lcsc": 2878346,+ "digikey": "2156-UC3845D8-ND",+ "mouser": "595-UC3845D8"+ },+ "distributor_check": {+ "checked_at": "2026-10-03T06:58:55Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "2156-UC3845D8-ND",+ "status": "found",+ "lifecycle": "Obsolete"+ },+ "mouser": {+ "pn": "595-UC3845D8",+ "status": "found",+ "lifecycle": "Obsolete"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "COMP",+ "type": "output",+ "description": "Error amplifier compensation pin for external compensation elements; internally current-limited, can be forced to GROUND to control zero duty cycle."+ },+ {+ "number": "2",+ "name": "VFB",+ "type": "input",+ "description": "Inverting input to internal error amplifier for controlling power converter voltage feedback loop and stability."+ },+ {+ "number": "3",+ "name": "ISENSE",+ "type": "input",+ "description": "Primary-side current sensing input connected to current sense resistor; PWM uses this signal to terminate OUTPUT switch conduction and can accept voltage ramp for voltage-mode control."+ },+ {+ "number": "4",+ "name": "RT/CT",+ "type": "bidirectional",+ "description": "Timing pin for fixed-frequency oscillator; connect timing resistor RRT to VREF and timing capacitor CCT to GROUND to set switching frequency."+ },+ {+ "number": "5",+ "name": "GROUND",+ "type": "power_in",+ "description": "Analog ground serving as both power ground and signal return; for packages without separate PWRGND, serves dual function as power and analog ground."+ },+ {+ "number": "6",+ "name": "OUTPUT",+ "type": "output",+ "description": "Gate driver output for external MOSFET; provides and sinks peak current up to 1A; actively held low when VCC is below turn-on threshold."+ },+ {+ "number": "7",+ "name": "VCC",+ "type": "power_in",+ "description": "Analog controller bias supply input; total current is static current plus average OUTPUT current; requires 0.1µF bypass capacitor directly to GROUND with minimum wiring length."+ },+ {+ "number": "8",+ "name": "VREF",+ "type": "power_in",+ "description": "5V precision reference voltage output; provides charging current to oscillator timing capacitor through timing resistor; requires 0.1µF ceramic bypass capacitor to GROUND for stability."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-4-5-20251001",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [],+ "pages_sent": 38,+ "cost_usd": 0.3435,+ "at": "2026-10-03T06:58:35"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/uc3842",+ "pages": 61,+ "sha256": "0f875fd24cbb5fda",+ "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]"+ }+}