LD1117AG-AD-TN3-A-R
Public Unreviewedby Ray
UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2(DPAK). Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdownLD1117AG-AD-TN3-A-R
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2(DPAK)
LD1117AG-AD-TN3-A-R from UTC Unisonic Tech, in a TO-252-2(DPAK). 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 for the adjustable output version. Feedback node held at VREF=1.25V (typ) relative to VOUT; connect a resistor divider from VOUT to ADJ to GND to program the output voltage. On fixed-voltage variants this pin functions as GND. |
| 2 | VOUT | power_out | Regulated positive output. Delivers up to 1A (LD1117A) with output noise ~100µV (10Hz-10kHz) and SVR ~75dB. Requires an output capacitor for stability; supports MLCC. |
| 3 | VIN | power_in | Unregulated positive input supply. Recommended operating input up to 15V, absolute maximum 18V. Requires VIN ≥ VOUT + dropout (≈1.2V at 800mA, 1.3V at 1A). |
| TAB | VOUT | power_out | Exposed metal tab of TO-252, internally tied to VOUT. Used for heat dissipation to the PCB copper pour; θJC ≈ 12 °C/W. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | TO-252-2(DPAK) |
| Category | PMIC |
| Pins | 4 |
Ordering variants
Same part, different packaging or reel option.
LD1117AG-AD-TN3-A-RLD1117AG-AD-TN3-A-RAA3LD1117AG-AD-TN3-A-RAB3LD1117AG-AD-TN3-A-RTA3LD1117AG-AD-TN3-A-RTF3LD1117AG-AD-TN3-A-RTNDLD1117AG-AD-TN3-A-RT2QLD1117AG-AD-TN3-A-RTQ2LD1117AG-AD-TN3-A-RTQ3LD1117AG-AD-TN3-A-RS08
CAD (KiCad official)
- Symbol:
LD1117AG-AD-TN3-A-R - Footprint:
Package_TO_SOT_SMD:TO-252-2 - 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
ld1117ag-ad-tn3-a-r.step |
119 KB | You want the bare part, or you mark your own boards. |
ld1117ag-ad-tn3-a-r-etched.step |
2.0 MB | You want the part with LD1117AG-AD-TN3-A-R already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 544 faces against 83 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.
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).