Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Regulator Type | Fixed positive LDO |
| Output Voltage | 3.3 V |
| Output Current | Up to 1 A |
| Dropout Voltage | Up to about 1.3 V at high load |
| Protection | Current limiting and thermal limiting |
| Package | SOT-223 |
Product Overview
AMS1117-3.3 is the fixed 3.3 V member of Advanced Monolithic Systems’ AMS1117 low-dropout regulator family. It is intended for simple medium-current linear regulation where a compact three-terminal solution is preferred over a switching converter.
The important design constraint is package dissipation. The regulator converts the input-to-output voltage difference directly into heat, so usable continuous current depends on VIN, load, board copper and ambient conditions rather than the 1 A headline rating alone.
Technical Specifications
| Group | Parameter | Value / Condition |
|---|---|---|
| Output | Nominal voltage | 3.3 V |
| Output | Current capability | Up to 1 A |
| Dropout | Maximum family value | About 1.3 V at high load |
| Regulation | Load regulation | 0.4% max family specification |
| Protection | Integrated | Current limit and thermal limiting |
| Package | Type | SOT-223 |
| Packing | Format | Tape and reel |
Functional Highlights
Fixed 3.3 V output keeps the external circuit simple
The fixed-output version removes the external resistor divider required by the adjustable AMS1117 variant.
Board thermal resistance determines practical load capability
At elevated VIN, power loss rises quickly with load current. Copper area around the SOT-223 tab should therefore be treated as part of the regulator design.
Applications / Application Fit
- 5 V to 3.3 V post-regulation
- Linear post-regulation after a switching converter
- Existing designs standardized on the AMS1117 pinout and SOT-223 footprint
Design Considerations
Confirm the worst-case input-to-output differential remains compatible with both dropout and thermal requirements.
Place the required output capacitor close to the regulator and follow the manufacturer stability guidance.
Evaluate junction temperature from the real PCB copper area rather than assuming the full 1 A rating is continuously available.
Related Engineering Resources
- AMS1117-3.3 verified Datasheet PDF — identity-verified datasheet hosted on HKEQGOO assets.
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
Request a Quote
To request a quotation, provide the manufacturer part number, required quantity, destination, target Date Code if applicable, and any testing or inspection requirements.
