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LD1117AG-33-AB3-C-R

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by Ray

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

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LD1117AG-33-AB3-C-R

UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

LD1117AG-33-AB3-C-R from UTC Unisonic Tech, 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 GND power_in Ground / device reference return. On the fixed-voltage LD1117A-33 this pin is the regulator common; the internal band-gap and error amplifier reference to this node. Quiescent current (~5 mA typ, 10 mA max) flows out of this pin.
2 VIN power_in Unregulated input supply. Recommended operating range up to 15 V (absolute max 18 V). For the 3.3 V fixed output, VIN must be at least VOUT + Vdropout (Vdropout ~1.15 V @ 500 mA, ~1.20 V @ 800 mA, ~1.20 V typ @ 1 A). Bypass to GND close to the pin.
3 VOUT power_out Regulated 3.3 V ±1% (typ, at 25 °C) fixed output, ±2% over full temperature range. Sources up to 1.0 A (LD1117A). Requires an output capacitor for stability; part supports MLCC output caps. Internally current-limited and thermally protected.

Key specifications

Parameter Value
Manufacturer UTC Unisonic Tech
Package SOT-89-3
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LD1117AG-33-AB3-C-R
  • LD1117AG-33-AB3-C-RAA3
  • LD1117AG-33-AB3-C-RTA3
  • LD1117AG-33-AB3-C-RTF3
  • LD1117AG-33-AB3-C-RTN3
  • LD1117AG-33-AB3-C-RTND
  • LD1117AG-33-AB3-C-RT2Q
  • LD1117AG-33-AB3-C-RTQ2
  • LD1117AG-33-AB3-C-RTQ3
  • LD1117AG-33-AB3-C-RS08

CAD (KiCad official)

  • Symbol: LD1117AG-33-AB3-C-R
  • 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: UTC Unisonic Tech datasheet (15 pp, sha256 523e17f5f8eefa72, 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