component
LM4121AIM5X-ADJ
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Texas Instruments Voltage Reference, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+41@@ -0,0 +1,41 @@+# LM4121AIM5X-ADJ++**Texas Instruments** · Voltage Reference · SOT-23-5++LM4121AIM5X-ADJ from Texas Instruments, in a SOT-23-5. 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 | ADJ | input | Adjust pin of the adjustable option that sets the output voltage through the feedback resistors; it is noise and capacitive-load sensitive, so its trace must be kept as short as possible with the feedback resistors close to it, and its bias current (typically flowing out of the pin, 15 to 40 nA) should be accounted for with R1 and R2 chosen below 1 MΩ. |+| 2 | GND | power_in | Negative supply or ground connection, where a single-point ground to the LM4121 helps ensure good accuracy at high load currents. |+| 3 | EN | input | Enable input that is pulled to the input supply for normal operation and turns the output off when forced to ground; it needs about 6 µA to turn the part on, a minimum slew rate of about 0.003 V/µs to avoid output glitches, and floating it is not recommended. |+| 4 | VIN | power_in | Positive supply input that operates from 1.8 V to 12 V, with the input and enable pins rated to a maximum of 14 V and a minimum of −0.3 V absolute. |+| 5 | VOUT | output | Reference output that sources and sinks up to ±5 mA and must be stable with a ceramic output capacitor of at least 0.022 µF (up to about 0.047 µF ceramic, with values above that requiring tantalum). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOT-23-5 |+| Category | Power Management (PMIC) |+| Pins | 5 |++## CAD (KiCad official)++- Symbol: `LM4121AIM5X-ADJ`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)+- 3D model files: `lm4121aim5x-adj-etched.step` / `lm4121aim5x-adj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm4121aim5x-adj.step` / `lm4121aim5x-adj.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/lm4121) (23 pp, sha256 `0ca0016b3d710f20`, retrieved 2026-10-08, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (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/lm4121aim5x-adj-datasheet.pdf)
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it is noise and capacitive-load sensitive, so its trace must be kept as short as possible with the feedback resistors close to it, and its bias current (typically flowing out of the pin, 15 to 40 nA) should be accounted for with R1 and R2 chosen below 1 MΩ."+ },+ {+ "number": "2",+ "name": "GND",+ "type": "power_in",+ "description": "Negative supply or ground connection, where a single-point ground to the LM4121 helps ensure good accuracy at high load currents."+ },+ {+ "number": "3",+ "name": "EN",+ "type": "input",+ "description": "Enable input that is pulled to the input supply for normal operation and turns the output off when forced to ground; it needs about 6 µA to turn the part on, a minimum slew rate of about 0.003 V/µs to avoid output glitches, and floating it is not recommended."+ },+ {+ "number": "4",+ "name": "VIN",+ "type": "power_in",+ "description": "Positive supply input that operates from 1.8 V to 12 V, with the input and enable pins rated to a maximum of 14 V and a minimum of −0.3 V absolute."+ },+ {+ "number": "5",+ "name": "VOUT",+ "type": "output",+ "description": "Reference output that sources and sinks up to ±5 mA and must be stable with a ceramic output capacitor of at least 0.022 µF (up to about 0.047 µF ceramic, with values above that requiring tantalum)."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.3",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.3",+ "primary_model": "claude-haiku-5-5",+ "primary_mode": "text",+ "consensus_model": "claude-sonnet-5-5",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "extractor flagged: Pin 1 is labeled REF on the 1.25 V option and ADJ on the adjustable option; this extraction uses the; Pin numbers were taken from the pin description text on page 12 because the connection diagram in th; The package is confirmed as SOT-23 (DBV), 5 pins, on the package option addendum (page 16), so the p"+ ],+ "pages_sent": 23,+ "cost_usd": 0.0792,+ "at": "2026-10-08T18:32:15"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/lm4121",+ "pages": 23,+ "sha256": "0ca0016b3d710f20",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 5,+ "described": 5,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "lm4121aim5x-adj.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 2.8,+ 2.9,+ 1.55+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "720a6eab0024069bbee68e7cb4c3ff1149468a34611225cdc852662c5d0ec2b7",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "lm4121aim5x-adj-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 2.8,+ 2.9,+ 1.55+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "25c48c3ba3e5267c66fec083add197cb665b2649de5a7d05e945ff0a88d9dd1e",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}