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ld1117ag-50-aa3-d-r
Public Unreviewedby Ray
UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. Datasheet-verified pinout, KiCad symbol/footprint/3D.
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markdownLD1117AG-50-AA3-D-R
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223
LD1117AG-50-AA3-D-R from UTC Unisonic Tech, in a SOT-223. 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 | VIN | power_in | Unregulated positive input supply. Recommended operating range up to 15V (abs max 18V). For the 5.0V variant, VIN must be at least ~6.5V for full regulation (dropout ~1.2V at 1A). Bypass with a 10uF capacitor close to the pin. |
| 2 | GND | power_in | Device ground reference. On fixed-output versions this pin sets the 0V reference for the internal error amplifier. Should be tied to system ground with a low-impedance return path. |
| 3 | VOUT | power_out | Regulated 5.0V output (tolerance +/-2%, 4.900V min / 5.100V max). Supplies up to 1.0A on the 'A' variant. Requires a minimum 10uF output capacitor for stability; MLCC supported per the ESR SOA graph. |
| 4 | TAB | power_out | Large SOT-223 heat-slug tab, internally connected to VOUT. Solder to a copper pour tied to the VOUT net for thermal dissipation (theta_JA = 165 C/W for SOT-223). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-223 |
| Category | PMIC |
| Pins | 4 |
Ordering variants
LD1117AG-50-AA3-D-RAA3-A-RLD1117AG-50-AA3-D-RAA3-B-RLD1117AG-50-AA3-D-RAA3-C-RLD1117AG-50-AA3-D-RLD1117AG-50-AA3-D-RAA3-A-TLD1117AG-50-AA3-D-RAA3-B-TLD1117AG-50-AA3-D-RAA3-C-TLD1117AG-50-AA3-D-RAA3-D-TLD1117AG-50-AA3-D-RAB3LD1117AG-50-AA3-D-RTA3LD1117AG-50-AA3-D-RTF3LD1117AG-50-AA3-D-RTN3LD1117AG-50-AA3-D-RTNDLD1117AG-50-AA3-D-RT2QLD1117AG-50-AA3-D-RTQ2LD1117AG-50-AA3-D-RTQ3LD1117AG-50-AA3-D-RAE5-GLD1117AG-50-AA3-D-RAF5-GLD1117AG-50-AA3-D-RS08LD1117AG-50-AA3-D-RSH2LD1117AG-50-AA3-D-RP5060-R
CAD (KiCad official)
- Symbol:
LD1117AG-50-AA3-D-R - Footprint:
Package_TO_SOT_SMD:SOT-223-3_TabPin2 - 3D model: SOT-223 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC Unisonic Tech datasheet (None pp, sha256
cc56230fa080b180, retrieved 2026-08-17, tier: lcsc) - 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).