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LM4040C50IDBZR

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by Ray

Texas Instruments Voltage Reference, SOT-23. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

markdown

LM4040C50IDBZR

Texas Instruments · Voltage Reference · SOT-23

LM4040C50IDBZR from Texas Instruments, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CATHODE passive Shunt current/voltage input (cathode of the shunt reference). Connect through a series resistor Rs from the supply Vs; the pin regulates to Vz = 5.0 V above ANODE at Iz = 100 µA to 15 mA.
2 ANODE passive Common pin, normally connected to ground. Reference return terminal of the shunt zener.
3 SUB passive Substrate connection. Pin 3 is attached to the die substrate and must be connected to ANODE or left open.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-23
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LM4040C50IDBZR
  • LM4040C50IDBZT
  • LM4040C50IDBZRIDCKR
  • LM4040C50IDBZRIDCKT

CAD (KiCad official)

  • Symbol: LM4040C50IDBZR
  • Footprint: Package_TO_SOT_SMD:SOT-23
  • 3D model: SOT-23 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
lm4040c50idbzr.step 59 KB You want the bare part, or you mark your own boards.
lm4040c50idbzr-etched.step 2.3 MB You want the part with LM4040C50IDBZR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 585 faces against 69 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: Texas Instruments datasheet (60 pp, sha256 b5a974bf159211df, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF