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LD1117AG-18-AA3-A-R
Public Made by Adomby adom
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.
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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README
markdownLD1117AG-18-AA3-A-R
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4
LD1117AG-18-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/ADJ | power_in | Ground terminal (labelled GND/ADJ in the datasheet pin key); on the adjustable version this pin is the ADJ terminal referenced to a 1.25V VREF, while on this fixed 1.8V part it returns the regulator ground. |
| 2 | VOUT | power_out | Regulated output terminal, which delivers 1.8V for the -18 version with output current up to 1.0A for the LD1117A (1A current code). |
| 3 | VIN | power_in | Unregulated input terminal, rated at 18V DC input absolute maximum and 15V recommended input voltage. |
| 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 |
|---|---|---|---|---|---|---|---|
| DC Input Voltage | VIN | 18 | V | 4 | |||
| Junction Temperature | TJ | 150 | °C | 4 | |||
| Operating Temperature | TOPR | -20 | 125 | °C | Note 2: determined from design, not 100% tested | 4 | |
| Storage temperature | TSTG | -65 | 150 | °C | 4 | ||
| Input Voltage | VIN | 15 | V | 4 | |||
| Operating Junction Temperature | TJ | -20 | 125 | °C | 4 | ||
| Junction to Ambient, SOT-223 | θJA | 165 | °C/W | SOT-223 package | 4 | ||
| Junction to Case, SOT-223 | θJC | 15 | C/W | SOT-223 package | 4 | ||
| Output Voltage | VOUT | 1.764 | 1.8 | 1.836 | V | VIN=3.8V, IOUT=10mA, TJ=25°C | 6 |
| Line Regulation | VOUT | 1 | 6 | mV | VIN=3.3 to 8V, IOUT=0mA | 6 | |
| Load Regulation | VOUT | 1 | 10 | mV | VIN=3.3V; LD1117A: IOUT=0~1000mA | 6 | |
| Temperature stability | VOUT | 0.5 | % | 6 | |||
| Long Term Stability | VOUT | 0.3 | % | 1000 hrs, TJ=125°C | 6 | ||
| Operating Input Voltage | VIN | 15 | V | IOUT=100mA | 6 | ||
| Quiescent Current | IQ | 5 | 10 | mA | VIN10V | 6 | |
| Current Limit (LD1117A) | ILIMIT | 1000 | mA | VIN=6.8V, TJ=25°C | 6 | ||
| Minimum Load Current | IO(MIN) | 2 | 5 | mA | VIN=15V | 6 | |
| Output Noise Voltage | eN | 100 | V | B=10Hz to 10KHz, TJ=25°C | 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 |
CAD (KiCad official)
- Symbol:
LD1117AG-18-AA3-A-R - Footprint:
Package_TO_SOT_SMD:SOT-223 - 3D model: SOT-223-4 (KiCad packages3D, STEP)
- 3D model files:
ld1117ag-18-aa3-a-r-etched.step/ld1117ag-18-aa3-a-r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ld1117ag-18-aa3-a-r.step/ld1117ag-18-aa3-a-r.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).