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LD1117AG-25-AA3-A-R

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UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LD1117AG-25-AA3-A-R

UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4

LD1117AG-25-AA3-A-R from UTC Unisonic Tech, in a SOT-223-4. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 GND power_in Ground reference pin (marked GND/ADJ; GND on this fixed 2.5V version), pin assignment code A.
2 VOUT power_out Regulated 2.5V output (2.450 to 2.550V at 25°C), with up to 1A output current for the LD1117A and internal current limit and over-temperature protection.
3 VIN power_in Input supply voltage, recommended maximum 15V and absolute maximum 18V.
4 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer UTC Unisonic Tech
Package SOT-223-4
Category Power Management (PMIC)
Pins 4

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output Voltage VOUT 2.45 2.5 2.55 V VIN=4.5V, IOUT=10mA, TJ=25°C 6
Line Regulation VOUT 1 6 mV VIN=3.9 to 10V, IOUT=0mA 6
Load Regulation VOUT 1 10 mV VIN=3.9V, LD1117A: IOUT=0~1000mA 6
Quiescent Current IQ 5 10 mA VIN10V 6
Supply Voltage Rejection SVR 60 75 dB IOUT=40mA, f=120Hz, TJ=25°C, VIN=5.5V, VRIPPLE=1VPP 6
Dropout Voltage VD 1 1.1 V IOUT=100mA 6
Dropout Voltage VD 1.15 1.25 V IOUT=500mA 6
Dropout Voltage VD 1.2 1.3 V IOUT=800mA 6
Thermal Regulation 0.01 0.1 %/W TA=25°C, 30ms Pulse 6
Input Voltage (recommended) VIN 15 V 4
Operating Junction Temperature TJ -20 125 °C 4
DC Input Voltage VIN 18 V 4
Junction Temperature TJ 150 °C 4
Operating Temperature TOPR -20 125 °C Note 2: determined from design only, not 100% tested in mass production 4
Storage Temperature TSTG -65 150 °C 4
Junction to Ambient, SOT-223 θJA 165 °C/W 4
Junction to Case, SOT-223 θJC 15 C/W 4

CAD (KiCad official)

  • Symbol: LD1117AG-25-AA3-A-R
  • Footprint: Package_TO_SOT_SMD:SOT-223
  • 3D model: SOT-223-4 (KiCad packages3D, STEP)
  • 3D model files: ld1117ag-25-aa3-a-r-etched.step / ld1117ag-25-aa3-a-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ld1117ag-25-aa3-a-r.step / ld1117ag-25-aa3-a-r.glb are the bare package body.

Provenance

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

  • Datasheet: UTC Unisonic Tech datasheet (15 pp, sha256 f7f26a117cb07dc2, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF