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INA121U
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Texas Instruments Instrumentation Amplifiers, SOIC-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 @@+# INA121U++**Texas Instruments** · Instrumentation Amplifiers · SOIC-8++INA121U 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 | RG | passive | Gain-setting resistor terminal; RG connects between pins 1 and 8 to set G = 1 + 50kΩ/RG (1 to 10,000 V/V), leave open for G = 1. |+| 2 | VIN- | power_in | Inverting input with internal over-voltage protection withstanding up to ±40V, and a ~4pA typical bias current that needs a return path. |+| 3 | VIN+ | power_in | Non-inverting input with internal over-voltage protection withstanding up to ±40V, and a ~4pA typical bias current that needs a return path. |+| 4 | V- | power_in | Negative supply, with total supply range ±2.25V to ±18V. |+| 5 | Ref | input | Output reference terminal, normally grounded, which must be a low-impedance connection to preserve CMR (8Ω in series degrades CMR to ~80dB at G = 1). |+| 6 | VO | output | Amplifier output referred to Ref, drives 1000pF capacitive load with ±14mA short-circuit current. |+| 7 | V+ | power_in | Positive supply, with total supply range ±2.25V to ±18V. |+| 8 | RG | passive | Gain-setting resistor terminal; RG connects between pins 1 and 8 to set G = 1 + 50kΩ/RG. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Amplifiers/Comparators |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `INA121U`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)+- 3D model files: `ina121u-etched.step` / `ina121u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ina121u.step` / `ina121u.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/ina121) (22 pp, sha256 `df8d2ff139ef60c7`, retrieved 2026-10-07, tier: lcsc)+- **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/ina121u-datasheet.pdf)
page.jsonadded+199@@ -0,0 +1,199 @@+{+ "slug": "ina121u",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments Instrumentation Amplifiers, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "amplifiers-comparators",+ "ina121u",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "ina121u.kicad_sym",+ "ina121u.kicad_mod",+ "ina121u.glb",+ "ina121u.step",+ "ina121u.lbr",+ "docs/hero.png",+ "docs/ina121u-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html",+ "ina121u-hero.glb",+ "ina121u-hero.overlay.json"+ ],+ "component": {+ "mpn": "INA121U",+ "manufacturer": "Texas Instruments",+ "package": "SOIC-8",+ "pin_count": 8,+ "category": "Amplifiers/Comparators",+ "subcategory": "Instrumentation Amplifiers",+ "datasheet": "https://www.ti.com/cn/lit/gpn/ina121",+ "parts": {+ "symbol": "ina121u.kicad_sym",+ "footprint": "ina121u.kicad_mod",+ "model_3d": "ina121u-hero.glb",+ "model_3d_plain": "ina121u.glb",+ "model_3d_step": "ina121u-etched.step",+ "model_3d_step_plain": "ina121u.step",+ "lbr": "ina121u.lbr"+ },+ "distributor_links": {+ "lcsc": "C2057413",+ "digikey": "INA121U-ND",+ "mouser": "595-INA121U"+ },+ "distributor_check": {+ "checked_at": "2026-10-07T08:31:56Z",+ "source": "Component Ocean /api/assign-pns",+ "digikey": {+ "pn": "INA121U-ND",+ "status": "found"+ },+ "mouser": {+ "pn": "595-INA121U",+ "status": "found"+ }+ },+ "pins": [+ {+ "number": "1",+ "name": "RG",+ "type": "passive",+ "description": "Gain-setting resistor terminal; RG connects between pins 1 and 8 to set G = 1 + 50kΩ/RG (1 to 10,000 V/V), leave open for G = 1."+ },+ {+ "number": "2",+ "name": "VIN–",+ "type": "power_in",+ "description": "Inverting input with internal over-voltage protection withstanding up to ±40V, and a ~4pA typical bias current that needs a return path."+ },+ {+ "number": "3",+ "name": "VIN+",+ "type": "power_in",+ "description": "Non-inverting input with internal over-voltage protection withstanding up to ±40V, and a ~4pA typical bias current that needs a return path."+ },+ {+ "number": "4",+ "name": "V–",+ "type": "power_in",+ "description": "Negative supply, with total supply range ±2.25V to ±18V."+ },+ {+ "number": "5",+ "name": "Ref",+ "type": "input",+ "description": "Output reference terminal, normally grounded, which must be a low-impedance connection to preserve CMR (8Ω in series degrades CMR to ~80dB at G = 1)."+ },+ {+ "number": "6",+ "name": "VO",+ "type": "output",+ "description": "Amplifier output referred to Ref, drives 1000pF capacitive load with ±14mA short-circuit current."+ },+ {+ "number": "7",+ "name": "V+",+ "type": "power_in",+ "description": "Positive supply, with total supply range ±2.25V to ±18V."+ },+ {+ "number": "8",+ "name": "RG",+ "type": "passive",+ "description": "Gain-setting resistor terminal; RG connects between pins 1 and 8 to set G = 1 + 50kΩ/RG."+ }+ ],+ "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": [+ "extractor flagged: Pin configuration diagram on PAGE 3 has unclear ASCII formatting; pinout determined from circuit sch"+ ],+ "pages_sent": 22,+ "cost_usd": 0.1805,+ "at": "2026-10-07T08:31:39"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/ina121",+ "pages": 22,+ "sha256": "df8d2ff139ef60c7",+ "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": "ina121u.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": "ina121u-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": "a0480f353a072d0db8857199a6261c4f248088b1d2545563cd3de1e2a3601982",+ "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]"+ }+}