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AMS1117S-3.3

Public Made by Adom

by adom

JSMSEMI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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AMS1117S-3.3

JSMSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

AMS1117S-3.3 from JSMSEMI, in a SOT-89-3. 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 reference pin. On the fixed 3.3V version this pin is the device ground return; the internal voltage divider references this pin.
2 VOUT power_out Regulated 3.3V output pin (typical 3.30V, min 3.234V, max 3.366V). Requires a minimum 10uF tantalum capacitor to GND (ESR ≤ 0.5Ω) for compensation and stability. Capable of sourcing up to 1A.
3 VIN power_in Unregulated input voltage pin. Maximum input voltage 30V; requires at least VOUT + 1.3V (dropout) for regulation. A 10uF tantalum input bypass capacitor is recommended.

Key specifications

Parameter Value
Manufacturer JSMSEMI
Package SOT-89-3
Category PMIC
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
Input voltage (maximum) VIN 30 V 2
Operating junction temperature range TJ -40 125 ℃ 2
Maximum power dissipation (SOT89) PD 400 mW 2
Thermal resistance, junction to ambient (SOT89) θJA 225 ℃/W 2
Output voltage (fixed 3.3 V) VOUT 3.234 3.3 3.366 V 10mA≤IOUT≤1A, VIN=Vout+2V 3
Line regulation 0.15 0.3 % (VOUT+ 1.5V)≤VIN≤12V, IOUT= 10mA 3
Load regulation 0.2 0.5 % (VIN-VOUT) = 2V, 10mA≤ IOUT≤1A 3
Dropout voltage 1.3 1.4 V VREF= 1%,IOUT=1A 3
Minimum load current 3 10 mA 1.5V≤(VIN-VOUT)≤12V 3
Quiescent current 3 10 mA VIN= VOUT+1.25V 3
Ripple rejection 60 70 dB f = 120Hz, Cout= 22uF Tantalum, (VIN-VOUT) = 3V, Iout=1A 3
Thermal regulation 0.008 0.04 %/W TA= 25℃, 30ms pulse 3
Long-term stability 0.3 1 % TA= 125℃, 1000hrs. 3
Current limit 1 A (VIN-VOUT)=2V 3
Temperature stability 0.5 % 3
RMS output noise (% of VOUT) 0.003 % TA= 25℃, 10Hz≤ f ≤10kHz 3
Thermal resistance, junction to case (SOT89) 20 ℃/W 3
Thermal shutdown junction temperature 150 ℃ 3
Thermal shutdown hysteresis 10 ℃ 3

CAD (KiCad official)

  • Symbol: AMS1117S-3.3
  • Footprint: Package_TO_SOT_SMD:SOT-89-3
  • 3D model: SOT-89-3 (KiCad packages3D, STEP)
  • 3D model files: ams1117s-3-3-etched.step / ams1117s-3-3-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ams1117s-3-3.step / ams1117s-3-3.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ams1117s-3-3.step 57 KB You want the bare part, or you mark your own boards.
ams1117s-3-3-etched.step 1.5 MB You want the part with AMS1117S-3.3 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 405 faces against 42 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: JSMSEMI datasheet (9 pp, sha256 fa4bc29b88340b9a, 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