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AMS1085CM-3.3

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by Ray

Advanced Monolithic Systems AMS1085CM 3 3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-263-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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AMS1085CM-3.3

Advanced Monolithic Systems AMS1085CM 3 3 · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-3

AMS1085CM-3.3 from Advanced Monolithic Systems AMS1085CM 3 3, in a TO-263-3. 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 GND power_in Ground reference for the fixed 3.3V regulator. Connects to the negative side of the load; carries only the small quiescent current (typ 5 mA, max 10 mA).
2 VOUT power_out Regulated 3.3V output (3.235 V to 3.365 V over temperature) with 3A output current capability. Requires an output capacitor for stability (22µF tantalum or 150µF aluminum electrolytic recommended). Electrically shorted to the package tab.
3 VIN power_in Unregulated input supply, 4.75V to 12V for the -3.3 fixed variant (absolute max 15V). Dropout is 1.3V max at IOUT = 3A. Bypass with a local capacitor (e.g., 1µF tantalum) recommended.
TAB VOUT power_out Metal tab is electrically connected to VOUT (pin 2) and serves as the primary thermal path. Solder to a copper pour (≥0.5 in² recommended) to achieve the specified θJA of 30°C/W.

Key specifications

Parameter Value
Manufacturer Advanced Monolithic Systems AMS1085CM 3 3
Package TO-263-3
Category PMIC
Pins 4

Ordering variants

  • AMS1085CM-3.3
  • AMS1085CM-3.3AMS1085CT-3.3
  • AMS1085CM-3.3AMS1085CD-3.3

CAD (KiCad official)

  • Symbol: AMS1085CM-3.3
  • Footprint: Package_TO_SOT_SMD:TO-263-2
  • 3D model: TO-263-3 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ams1085cm-3-3.step 108 KB You want the bare part, or you mark your own boards.
ams1085cm-3-3-etched.step 2.2 MB You want the part with AMS1085CM-3.3 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 573 faces against 79 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: Advanced Monolithic Systems AMS1085CM 3 3 datasheet (9 pp, sha256 32e902e83fe32b68, retrieved 2026-08-17, tier: lcsc)
  • 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