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LD1117S12CTR

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STMicroelectronics Dropout Regulators(LDO), SOT-223. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

componentpower management icsld1117s12ctr
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Contents

README

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LD1117S12CTR

STMicroelectronics · Dropout Regulators(LDO) · SOT-223

LD1117S12CTR from STMicroelectronics, 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 GND power_in Ground / common return for the regulator. Reference for both VIN and VOUT.
2 VOUT power_out Regulated 1.2 V fixed output (±1% at 25 °C), up to 800 mA. Requires a minimum 10 µF output capacitor for loop stability. Electrically common with the tab.
3 VIN power_in Unregulated input supply. Must be at least VOUT + Vdropout (~1 V typ.) above VOUT. Absolute maximum 15 V.
TAB VOUT power_out Thermal tab, electrically connected to VOUT. Used both for heat dissipation and as the regulated output node.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOT-223
Category Power Management ICs
Pins 4

Ordering variants

Same part, different packaging or reel option.

  • LD1117S12CTR
  • LD1117S12CTRV12
  • LD1117S12CTRDT12
  • LD1117S12CTRD12

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 VO 1.176 1.2 1.224 V Vin - VO = 2 V, IO = 10 mA, TJ = 25 °C 15
Output voltage VO 1.12 1.2 1.28 V IO = 10 to 800 mA, Vin - VO = 1.4 to 10 V 15
Line regulation ΔVO 1 % Vin - VO = 1.5 to 13.75 V, IO = 10 mA 15
Load regulation ΔVO 1 % Vin - VO = 3 V, IO = 10 to 800 mA 15
Temperature stability ΔVO 0.5 % 15
Long term stability ΔVO 0.3 % 1000 hrs, TJ = 125 °C 15
Operating input voltage Vin 15 V 15
Adjustment pin current Iadj 60 120 µA Vin ≤ 15 V 15
Adjustment pin current change ΔIadj 1 5 µA Vin - VO = 1.4 to 10 V, IO = 10 to 800 mA 15
Minimum load current IO(min) 2 5 mA Vin = 15 V 15
Output current IO 800 950 1300 mA Vin - VO = 5 V, TJ = 25 °C 15
Output noise (%VO) eN 0.003 % B = 10 Hz to 10 kHz, TJ = 25 °C 15
Supply voltage rejection SVR 60 75 dB IO = 40 mA, f = 120 Hz, TJ = 25 °C; Vin - VO = 3 V, Vripple = 1 VPP 15
Dropout voltage Vd 1 1.1 V IO = 100 mA, TJ = 0 to 125 °C 15
Dropout voltage Vd 1.05 1.2 V IO = 500 mA, TJ = 0 to 125 °C 15
Dropout voltage Vd 1.1 1.3 V IO = 800 mA, TJ = 0 to 125 °C 15
Operating junction temperature range (C version) TOP -40 125 °C for C version 7
DC input voltage VIN 15 V 7
Power dissipation PTOT 12 W 7
Storage temperature range TSTG -40 150 °C 7
Thermal resistance junction-case RthJC 15 °C/W SOT-223 package 7
Thermal resistance junction-ambient RthJA 110 °C/W SOT-223 package 7
Thermal regulation 0.01 0.1 %/W Ta = 25 °C, 30 ms Pulse 15

CAD (KiCad official)

  • Symbol: LD1117S12CTR
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: ld1117s12ctr-etched.step / ld1117s12ctr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ld1117s12ctr.step / ld1117s12ctr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (44 pp, sha256 1b80923ec6ca9161, 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).

Datasheet PDF