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LD2981ABU33TR

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by Ray

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpmicld2981abu33tr
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3D Model

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Symbol & Footprint

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Datasheet

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Contents

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LD2981ABU33TR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

LD2981ABU33TR from STMicroelectronics, in a SOT-89-3. 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 VOUT power_out Regulated output port. Fixed 3.3 V (LD2981ABU33), guaranteed up to 100 mA. Requires a 2.2 µF (or larger, low-ESR ceramic) output capacitor to ground for stability.
2 GND power_in Device ground reference. Also serves as the thermal path (tab connection in SOT-89, RthJC = 15 °C/W).
3 VIN power_in Unregulated DC input port. Operating range 2.5 V to 16 V (absolute max 16 V). Requires a 1 µF (typ.) input decoupling capacitor to ground.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOT-89-3
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LD2981ABU33TRU
  • LD2981ABU33TRM

CAD (KiCad official)

  • Symbol: LD2981ABU33TR
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: STMicroelectronics datasheet (27 pp, sha256 872f7e5b1c76b812, 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