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AMS1117-2.85
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Advanced Monolithic Systems Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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ams1117-2-85: specified limits as data (metadata.characteristics, 19 rows from the datasheet)
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AMS1117-2.85
Advanced Monolithic Systems · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223
AMS1117-2.85 from Advanced Monolithic Systems, 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 / negative supply reference for the fixed-voltage regulator. Serves as the internal Kelvin return for the top of the on-die output divider (R1 connected internally to case), so it can also be used for negative-side load sensing. |
| 2 | VOUT | power_out | Regulated 2.85V output, 1A maximum (2.808V-2.892V typical, tightened tolerance 2.7645V-2.9355V over full temperature). Requires a 22µF solid tantalum output capacitor for frequency compensation and stability. |
| 3 | VIN | power_in | Unregulated DC input, 15V absolute maximum. Must exceed VOUT by at least 1.1V typical / 1.3V max dropout at 0.8A load; recommended nominal 4.35V for the 2.85V variant. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Advanced Monolithic Systems |
| Package | SOT-223 |
| Category | PMIC |
| Pins | 3 |
Ordering variants
AMS1117-2.85AMS1117-2.85AMS1117CD-2.85AMS1117-2.85AMS1117CS-2.85
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 | 2.808 | 2.85 | 2.892 | V | VIN = 4.35V; IOUT = 0 mA; TJ = +25°C unless otherwise specified | 2 | |
| Output Voltage | 2.7645 | 2.85 | 2.9355 | V | VIN = 4.35V | 2 | |
| Line Regulation | 0.3 | 6 | mV | 1.5V ≤ (VIN - VOUT) ≤ 12V | 2 | ||
| Line Regulation | 0.6 | 6 | mV | 1.5V ≤ (VIN - VOUT) ≤ 12V | 2 | ||
| Load Regulation | 3 | 12 | mV | VIN = 4.35V, 0 ≤ IOUT ≤ 0.8A | 3 | ||
| Load Regulation | 6 | 20 | mV | VIN = 4.35V, 0 ≤ IOUT ≤ 0.8A | 3 | ||
| Dropout Voltage (VIN - VOUT) | 1.1 | 1.3 | V | ΔVOUT, ΔVREF = 1%, IOUT = 0.8A (Note 4) | 3 | ||
| Current Limit | 900 | 1100 | 1500 | mA | (VIN - VOUT) = 1.5V | 3 | |
| Quiescent Current | 5 | 11 | mA | (VIN - VOUT) = 1.5V | 3 | ||
| Ripple Rejection | 60 | 72 | dB | f = 120Hz, COUT = 22µF Tantalum, IOUT = 1A, VIN = 4.35V | 3 | ||
| Long Term Stability | 0.3 | 1 | % | TA = 125°C, 1000Hrs | 3 | ||
| Input Voltage | 15 | V | 2 | ||||
| Lead Temperature | 265 | °C | 25 sec | 2 | |||
| Storage Temperature | -65 | 150 | °C | 2 | |||
| Operating Junction Temperature Range (Control Section) | -40 | 125 | °C | Control section | 2 | ||
| Operating Junction Temperature Range (Power Transistor) | -40 | 125 | °C | Power transistor | 2 | ||
| Maximum Power Dissipation (line and load regulation guarantee) | 1.2 | W | SOT-223; line and load regulation guaranteed up to this power dissipation (Note 2) | 3 | |||
| Thermal Resistance Junction-to-Ambient | ϕJA | 90 | °C/W | SOT-223 package; with package soldering to copper area over backside ground plane or internal power plane | 2 | ||
| Thermal Resistance Junction-to-Case | 15 | °C/W | All packages | 3 |
CAD (KiCad official)
- Symbol:
AMS1117-2.85 - Footprint:
Package_TO_SOT_SMD:SOT-223-3_TabPin2 - 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files:
ams1117-2-85-etched.step/ams1117-2-85-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ams1117-2-85.step/ams1117-2-85.glbare the bare package body.
3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
ams1117-2-85.step |
64 KB | You want the bare part, or you mark your own boards. |
ams1117-2-85-etched.step |
1.8 MB | You want the part with AMS1117-2.85 already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 456 faces against 75 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: Advanced Monolithic Systems datasheet (8 pp, sha256
189a2651878a87d5, 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).
# AMS1117-2.85
**Advanced Monolithic Systems** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223
AMS1117-2.85 from Advanced Monolithic Systems, 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 / negative supply reference for the fixed-voltage regulator. Serves as the internal Kelvin return for the top of the on-die output divider (R1 connected internally to case), so it can also be used for negative-side load sensing. |
| 2 | VOUT | power_out | Regulated 2.85V output, 1A maximum (2.808V-2.892V typical, tightened tolerance 2.7645V-2.9355V over full temperature). Requires a 22µF solid tantalum output capacitor for frequency compensation and stability. |
| 3 | VIN | power_in | Unregulated DC input, 15V absolute maximum. Must exceed VOUT by at least 1.1V typical / 1.3V max dropout at 0.8A load; recommended nominal 4.35V for the 2.85V variant. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Advanced Monolithic Systems |
| Package | SOT-223 |
| Category | PMIC |
| Pins | 3 |
## Ordering variants
- `AMS1117-2.85`
- `AMS1117-2.85AMS1117CD-2.85`
- `AMS1117-2.85AMS1117CS-2.85`
## 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 | | 2.808 | 2.85 | 2.892 | V | VIN = 4.35V; IOUT = 0 mA; TJ = +25°C unless otherwise specified | 2 |
| Output Voltage | | 2.7645 | 2.85 | 2.9355 | V | VIN = 4.35V | 2 |
| Line Regulation | | | 0.3 | 6 | mV | 1.5V ≤ (VIN - VOUT) ≤ 12V | 2 |
| Line Regulation | | | 0.6 | 6 | mV | 1.5V ≤ (VIN - VOUT) ≤ 12V | 2 |
| Load Regulation | | | 3 | 12 | mV | VIN = 4.35V, 0 ≤ IOUT ≤ 0.8A | 3 |
| Load Regulation | | | 6 | 20 | mV | VIN = 4.35V, 0 ≤ IOUT ≤ 0.8A | 3 |
| Dropout Voltage (VIN - VOUT) | | | 1.1 | 1.3 | V | ΔVOUT, ΔVREF = 1%, IOUT = 0.8A (Note 4) | 3 |
| Current Limit | | 900 | 1100 | 1500 | mA | (VIN - VOUT) = 1.5V | 3 |
| Quiescent Current | | | 5 | 11 | mA | (VIN - VOUT) = 1.5V | 3 |
| Ripple Rejection | | 60 | 72 | | dB | f = 120Hz, COUT = 22µF Tantalum, IOUT = 1A, VIN = 4.35V | 3 |
| Long Term Stability | | | 0.3 | 1 | % | TA = 125°C, 1000Hrs | 3 |
| Input Voltage | | | | 15 | V | | 2 |
| Lead Temperature | | | | 265 | °C | 25 sec | 2 |
| Storage Temperature | | -65 | | 150 | °C | | 2 |
| Operating Junction Temperature Range (Control Section) | | -40 | | 125 | °C | Control section | 2 |
| Operating Junction Temperature Range (Power Transistor) | | -40 | | 125 | °C | Power transistor | 2 |
| Maximum Power Dissipation (line and load regulation guarantee) | | | | 1.2 | W | SOT-223; line and load regulation guaranteed up to this power dissipation (Note 2) | 3 |
| Thermal Resistance Junction-to-Ambient | ϕJA | | 90 | | °C/W | SOT-223 package; with package soldering to copper area over backside ground plane or internal power plane | 2 |
| Thermal Resistance Junction-to-Case | | | 15 | | °C/W | All packages | 3 |
## CAD (KiCad official)
- Symbol: `AMS1117-2.85`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `ams1117-2-85-etched.step` / `ams1117-2-85-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ams1117-2-85.step` / `ams1117-2-85.glb` are the bare package body.
## 3D model downloads
Two STEP files. Same geometry, different body top:
| File | Size | Use it when |
|---|---|---|
| [`ams1117-2-85.step`](ams1117-2-85.step) | 64 KB | You want the bare part, or you mark your own boards. |
| [`ams1117-2-85-etched.step`](ams1117-2-85-etched.step) | 1.8 MB | You want the part with `AMS1117-2.85` already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 456 faces against 75 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:** [Advanced Monolithic Systems datasheet](docs/ams1117-2-85-datasheet.pdf) (8 pp, sha256 `189a2651878a87d5`, 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](docs/ams1117-2-85-datasheet.pdf)