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LM4128BQ1MFX3.3

Public Made by Adom

by adom

Texas Instruments Voltage Reference, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM4128BQ1MFX3.3

Texas Instruments · Voltage Reference · SOT-23-5

LM4128BQ1MFX3.3 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 N/C unconnected No connect pin; leave floating.
2 GND power_in Ground connection for the device.
3 EN input Enable input: the datasheet gives VIL maximum 35 % and VIH minimum 65 % of the supply level, and EN = 0 V puts the part in shutdown with 3 µA typical supply current.
4 VIN power_in Input supply, maximum 5.5 V, operating from VREF + 400 mV to 5.5 V at 10 mA load.
5 VREF power_out Reference voltage output, sourcing up to 20 mA maximum load current.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23-5
Category Power Management (PMIC)
Pins 5

CAD (KiCad official)

  • Symbol: LM4128BQ1MFX3.3
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lm4128bq1mfx3-3-etched.step / lm4128bq1mfx3-3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm4128bq1mfx3-3.step / lm4128bq1mfx3-3.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (35 pp, sha256 e27d30b33d01ce1e, 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