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LD1117AL-33-TA3-A-T

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UTC(Unisonic Tech) Linear Voltage Regulators (LDO), TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LD1117AL-33-TA3-A-T

UTC(Unisonic Tech) · Linear Voltage Regulators (LDO) · TO-220

LD1117AL-33-TA3-A-T from UTC(Unisonic Tech), in a TO-220. 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 reference pin (GND/ADJ) of the fixed 3.3V LD1117A, which is the adjust pin only on the ADJ version; pin code A assigns G to pin 1.
2 VOUT power_out Regulated 3.3V output (3.234 to 3.366V) delivering up to 1A for the LD1117A, with a 10µF output capacitor (CO) used in the test conditions.
3 VIN power_in Unregulated input supply, recommended up to 15V and absolute maximum 18V, with a typical dropout of 1.0 to 1.3V depending on load.

Key specifications

Parameter Value
Manufacturer UTC(Unisonic Tech)
Package TO-220
Category Power Management ICs
Pins 3

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 3.234 3.3 3.366 V VIN=5.3V, IOUT=10mA, TJ=25°C 8
Line Regulation VOUT 1 6 mV VIN=4.75 to 15V, IOUT=0mA 8
Load Regulation VOUT 1 10 mV VIN=4.75V, LD1117A: IOUT=0~1000mA 8
Operating Input Voltage VIN 15 V IOUT=100mA 8
Quiescent Current IQ 5 10 mA VIN≤15V 8
Current Limit ILIMIT 1000 mA LD1117A, VIN=8.3V, TJ=25°C 8
Supply Voltage Rejection SVR 60 75 dB IOUT=40mA, f=120Hz, TJ=25°C, VIN=6.3V, VRIPPLE=1VPP 8
Dropout Voltage VD 1 1.1 V IOUT=100mA 8
Dropout Voltage VD 1.15 1.25 V IOUT=500mA 8
Dropout Voltage VD 1.2 1.3 V IOUT=800mA 8
Thermal Regulation 0.01 0.1 %/W TA=25°C, 30ms Pulse 8
DC Input Voltage VIN 18 V TA=25°C 4
Junction Temperature TJ 150 °C TA=25°C 4
Operating Temperature TOPR -20 125 °C TA=25°C 4
Storage Temperature TSTG -65 150 °C TA=25°C 4
Input Voltage VIN 15 V 4
Operating Junction Temperature TJ -20 125 °C 4
Thermal Resistance Junction to Ambient θJA 54 °C/W TO-220 4
Thermal Resistance Junction to Case θJC 4 °C/W TO-220/TO-262/TO-263 4
Temperature stability VOUT 0.5 % 8
Long Term Stability VOUT 0.3 % 1000 hrs, TJ=125°C 8
Output Noise Voltage eN 100 µV B=10Hz to 10KHz, TJ=25°C 8

CAD (KiCad official)

  • Symbol: LD1117AL-33-TA3-A-T
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220 (KiCad packages3D, STEP)
  • 3D model files: ld1117al-33-ta3-a-t-etched.step / ld1117al-33-ta3-a-t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ld1117al-33-ta3-a-t.step / ld1117al-33-ta3-a-t.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 2026-10-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-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).

Datasheet PDF