component

LM4121AIM5X-ADJ

Public Made by Adom

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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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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 (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