component
UC3844D8TR
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.
← Commit history
README.mdadded+45@@ -0,0 +1,45 @@+# UC3844D8TR++**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-8++UC3844D8TR 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. Connect external compensation elements to modify error amplifier output; internal current limiting allows forcing COMP to GROUND externally to control zero duty cycle. |+| 2 | VFB | input | Inverting input of internal error amplifier used to control power converter voltage feedback loop for stability. |+| 3 | ISENSE | input | Primary side current sensing pin connected to current sense resistor; PWM uses this signal to terminate OUTPUT switch conduction; voltage ramp can be applied for voltage mode control configuration. |+| 4 | RT/CT | bidirectional | Fixed frequency oscillator setting point; timing resistor RRT connects from this pin to VREF and timing capacitor CCT connects to GROUND to set switching frequency; keep timing capacitor leads as short as possible and directly connected to device GROUND. |+| 5 | GROUND | power_in | Analog ground. For device packages without PWRGND, GROUND serves as both power ground and analog ground. |+| 6 | OUTPUT | output | Gate driver for external MOSFET; on-chip driver output designed to directly drive MOSFET with peak current up to 1A sourced and sunk; actively held low when VCC is below turn-on threshold. |+| 7 | VCC | power_in | Analog controller bias input for powering the device; total VCC current equals static VCC current plus average OUTPUT current; requires 0.1µF bypass capacitor directly connected to GROUND with minimal trace length. |+| 8 | VREF | power_in | 5V reference voltage providing charging current to oscillator timing capacitor through timing resistor; bypass to ground with ceramic capacitor placed close to pin connection; minimum 0.1µF ceramic capacitor required for reference stability. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Power Management (PMIC) |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `UC3844D8TR`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)+- 3D model files: `uc3844d8tr-etched.step` / `uc3844d8tr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc3844d8tr.step` / `uc3844d8tr.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 2026-10-07, 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/uc3844d8tr-datasheet.pdf)
page.jsonadded+198@@ -0,0 +1,198 @@+{+ "slug": "uc3844d8tr",+ "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)",+ "uc3844d8tr",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "uc3844d8tr.kicad_sym",+ "uc3844d8tr.kicad_mod",+ "uc3844d8tr.glb",+ "uc3844d8tr.step",+ "uc3844d8tr.lbr",+ "docs/hero.png",+ "docs/uc3844d8tr-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "uc3844d8tr-hero.glb",+ "uc3844d8tr-hero.overlay.json"+ ],+ "component": {+ "mpn": "UC3844D8TR",+ "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": "uc3844d8tr.kicad_sym",+ "footprint": "uc3844d8tr.kicad_mod",+ "model_3d": "uc3844d8tr-hero.glb",+ "model_3d_plain": "uc3844d8tr.glb",+ "model_3d_step": "uc3844d8tr-etched.step",+ "model_3d_step_plain": "uc3844d8tr.step",+ "lbr": "uc3844d8tr.lbr"+ },+ "distributor_links": {+ "lcsc": "C2657919",+ "digikey": "296-47907-2-ND",+ "mouser": "595-UC3844D8TR"+ },+ "distributor_check": {+ "checked_at": "2026-10-07T08:32:13Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "296-47907-2-ND",+ "status": "found",+ "lifecycle": "Active"+ },+ "mouser": {+ "pn": "595-UC3844D8TR",+ "status": "found"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "COMP",+ "type": "output",+ "description": "Error amplifier compensation pin. Connect external compensation elements to modify error amplifier output; internal current limiting allows forcing COMP to GROUND externally to control zero duty cycle."+ },+ {+ "number": "2",+ "name": "VFB",+ "type": "input",+ "description": "Inverting input of internal error amplifier used to control power converter voltage feedback loop for stability."+ },+ {+ "number": "3",+ "name": "ISENSE",+ "type": "input",+ "description": "Primary side current sensing pin connected to current sense resistor; PWM uses this signal to terminate OUTPUT switch conduction; voltage ramp can be applied for voltage mode control configuration."+ },+ {+ "number": "4",+ "name": "RT/CT",+ "type": "bidirectional",+ "description": "Fixed frequency oscillator setting point; timing resistor RRT connects from this pin to VREF and timing capacitor CCT connects to GROUND to set switching frequency; keep timing capacitor leads as short as possible and directly connected to device GROUND."+ },+ {+ "number": "5",+ "name": "GROUND",+ "type": "power_in",+ "description": "Analog ground. For device packages without PWRGND, GROUND serves as both power ground and analog ground."+ },+ {+ "number": "6",+ "name": "OUTPUT",+ "type": "output",+ "description": "Gate driver for external MOSFET; on-chip driver output designed to directly drive MOSFET with peak current up to 1A sourced and sunk; actively held low when VCC is below turn-on threshold."+ },+ {+ "number": "7",+ "name": "VCC",+ "type": "power_in",+ "description": "Analog controller bias input for powering the device; total VCC current equals static VCC current plus average OUTPUT current; requires 0.1µF bypass capacitor directly connected to GROUND with minimal trace length."+ },+ {+ "number": "8",+ "name": "VREF",+ "type": "power_in",+ "description": "5V reference voltage providing charging current to oscillator timing capacitor through timing resistor; bypass to ground with ceramic capacitor placed close to pin connection; minimum 0.1µF ceramic capacitor required for reference 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": 0.3092,+ "at": "2026-10-07T08:31:55"+ },+ "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"+ },+ "models_3d": [+ {+ "file": "uc3844d8tr.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 4.9,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "uc3844d8tr-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 4.9,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "a26ba12ab755a64984ba8801e771d7316cf8587a9f5e16beec4de7f6b104bcbd",+ "checked": "2026-10-07",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}