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LM385M3X-2.5

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by Ray

Texas Instruments LM385M3X 2 5 NOPB 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

LM385M3X-2.5

Texas Instruments · Voltage Reference · SOT-23

LM385M3X-2.5 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 + passive Positive terminal (cathode) of the shunt voltage reference. Bias with an external current-setting resistor from the supply so that 20 µA <= I_R <= 20 mA; the pin then regulates at ~2.5 V relative to the '-' terminal.
2 - passive Negative terminal (anode) of the shunt voltage reference. Normally returned to circuit ground / common; forms the low side of the 2.5 V reference across pins 1 and 2.
3 DAP passive Die Attach Pad (DAP). Not an electrical function of the reference; the datasheet directs this pin be connected to pin 2 (anode/ground) or left floating.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • LM385M3X-2.5
  • LM385M3X-2.5M
  • LM385M3X-2.5Z
  • LM385M3X-2.5H
  • LM385M3X-2.5E

CAD (KiCad official)

  • Symbol: LM385M3X-2.5
  • 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
lm385m3x-2-5.step 59 KB You want the bare part, or you mark your own boards.
lm385m3x-2-5-etched.step 2.1 MB You want the part with LM385M3X-2.5 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 503 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 (25 pp, sha256 04df8bea6c6dffee, 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