AMS1117S-3.3
Public Made by Adomby adom
JSMSEMI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdownAMS1117S-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ams1117s-3-3.step/ams1117s-3-3.glbare 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).