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LM4128AMFX-3.0

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

componentpower management (pmic)lm4128amfx-3.0factory-2.0.0extractor-text

Verified LM4128AMFX-3.0

by Ray · last 5 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

5 Nov 2026RayPublished by the parts factory: tier mfr, 5 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: LM4128AMFX-3.0 · SOT-23-5 · 5 pins
  • ✓copper: 5 copper pads, none touching another net
  • ✓datasheet: all 5 pin names found in the 35-page datasheet
  • ✓distributor: lcsc C2157739, digikey LM4128AMFX-3.0-ND, mouser 926-LM4128AMFX-30
  • ✓family: SOT-23-5
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-e4l9a0q_/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 5 pins = 5 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 5 pins agree
  • ✓symbol_text: no pin names collide
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lm4128amfx-3-0.kicad_sym✓ lm4128amfx-3-0.kicad_mod✓ lm4128amfx-3-0.step
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3D Model

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Symbol & Footprint

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Contents

README

markdown

LM4128AMFX-3.0

Texas Instruments · Voltage Reference · SOT-23-5

LM4128AMFX-3.0 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 that must be left floating.
2 GND power_in Ground reference pin for the device.
3 EN input Enable pin: the enable input low level is at most 35% and the high level at least 65% of VIN, and with EN at 0V the supply current in shutdown is 3 µA typical and 7 µA maximum.
4 VIN power_in Input supply pin with a maximum voltage of 5.5V, which must be at least VREF + 400 mV for regulation.
5 VREF power_out Voltage reference output that supplies a maximum load current of 20 mA.

Key specifications

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

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output Voltage Initial Accuracy VREF -0.1 0.1 % LM4128A-3.0 (A Grade - 0.1%) 6
Temperature Coefficient TCVREF / °C 75 ppm / °C LM4128A-3.0 6
Supply Current IQ 60 100 µA 6
Supply Current in Shutdown IQ_SD 3 7 µA EN = 0V 6
Line Regulation ΔVREF/ΔVIN 70 ppm / V VREF + 400 mV ≤ VIN ≤ 5.5V 6
Load Regulation ΔVREF/ΔILOAD 25 120 ppm / mA 0 mA ≤ ILOAD ≤ 20 mA 6
Dropout Voltage VIN - VREF 175 400 mV ILOAD = 10 mA 6
Enable Pin Maximum Low Input Level VIL 35 %V 6
Enable Pin Minimum High Input Level VIH 65 %V 6
Maximum Voltage on any input -0.3 6 V 2
Power Dissipation 350 mW TA = 25°C 2
Storage Temperature Range -65 150 °C 2
Lead Temperature Soldering 260 °C soldering, 10 sec 2
Lead Temperature Vapor Phase 215 °C Vapor Phase (60 sec) 2
Lead Temperature Infrared 220 °C Infrared (15 sec) 2
ESD Susceptibility Human Body Model 2 kV Human Body Model 2
Maximum Input Supply Voltage 5.5 V 2
Maximum Load Current 20 mA 2
Junction Temperature Range TJ -40 125 °C 2
Junction to Ambient Thermal Resistance θJ-A 220 °C/W SOT-23 package, without PCB copper enhancements 2
Thermal Hysteresis 75 ppm -40°C ≤ TJ ≤ +125°C 6
Long Term Stability ΔVREF 50 ppm 1000 Hrs 6
Output Noise Voltage VN 285 µVPP 0.1 Hz to 10 Hz 6
Short Circuit Current ISC 75 mA 6

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
housing Abs ESD Susceptibility(3) Human Body Model 2 kV (1) Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for 2

CAD (KiCad official)

  • Symbol: LM4128AMFX-3.0
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: lm4128amfx-3-0-etched.step / lm4128amfx-3-0-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm4128amfx-3-0.step / lm4128amfx-3-0.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 2026-11-05, tier: manufacturer)
  • 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