component
LD1117AG-AD-AA3-A-R
Public Unreviewedby Ray
UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Datasheet-verified pinout, 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-AD-AA3-A-R
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4
LD1117AG-AD-AA3-A-R from UTC Unisonic Tech, in a SOT-223-4. 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 | ADJ | input | Adjust pin. Reference voltage node (VREF = 1.25V typ) used with an external resistor divider from VOUT to ADJ to GND to set the output voltage. On the fixed-voltage versions this pin is GND; on the AD (adjustable) variant it is the feedback/ADJ input. |
| 2 | VOUT | power_out | Regulated positive output. Adjustable via external resistor divider between VOUT, ADJ, and GND (VOUT = 1.25V × (1 + R2/R1) + IADJ·R2). Delivers up to 1A (A-suffix). Requires an output capacitor for stability; supports MLCC. |
| 3 | VIN | power_in | Unregulated positive supply input. Absolute maximum 18V, recommended operating up to 15V. Must exceed VOUT by at least the dropout voltage (typ 1.15V at 500mA, 1.20V at 800mA/1A). |
| 4 | VOUT | power_out | SOT-223 thermal tab, internally connected to VOUT (die attach pad). Solder to a copper pour to improve θJA. Electrically equivalent to pin 2. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-223-4 |
| Category | PMIC |
| Pins | 4 |
Ordering variants
Same part, different packaging or reel option.
LD1117AG-AD-AA3-A-RLD1117AG-AD-AA3-A-RAB3LD1117AG-AD-AA3-A-RTA3LD1117AG-AD-AA3-A-RTF3LD1117AG-AD-AA3-A-RTN3LD1117AG-AD-AA3-A-RTNDLD1117AG-AD-AA3-A-RT2QLD1117AG-AD-AA3-A-RTQ2LD1117AG-AD-AA3-A-RTQ3LD1117AG-AD-AA3-A-RS08
CAD (KiCad official)
- Symbol:
LD1117AG-AD-AA3-A-R - Footprint:
Package_TO_SOT_SMD:SOT-223 - 3D model: SOT-223-4 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC Unisonic Tech datasheet (15 pp, sha256
f7f26a117cb07dc2, 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).