Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Regulator Type | Fixed positive LDO |
| Output Voltage | 3.3 V |
| Output Current | Up to 1.2 A source-listed rating |
| Maximum Supply Voltage | 15 V |
| Dropout | 1.5 V at 800 mA source-listed value |
| Package | SOT-223 |
Product Overview
AMS1117-3.3V is a JSMSEMI fixed 3.3 V positive linear regulator in SOT-223. The available source data identifies a 15 V maximum supply rating, a 1.2 A output-current rating and thermal-shutdown capability.
Because this is a linear regulator, usable current is constrained by the input-to-output voltage difference and the thermal path from the SOT-223 tab into the PCB. The current rating should therefore not be treated independently of board copper and ambient temperature.
Technical Specifications
| Group | Parameter | Value / Condition |
|---|---|---|
| Output | Nominal voltage | 3.3 V |
| Output | Current rating | Up to 1.2 A source-listed |
| Input | Maximum supply | 15 V |
| Dropout | Source-listed condition | 1.5 V at 800 mA |
| Supply | Standby current | 5 mA source-listed |
| Protection | Integrated | Thermal shutdown |
| Package | Type | SOT-223 |
Functional Highlights
Fixed 3.3 V output simplifies the regulator network
The fixed-output version does not require an adjustable feedback divider.
Thermal dissipation is the main continuous-current constraint
For a linear regulator, power loss is approximately (VIN − 3.3 V) × IOUT. Higher input voltage therefore reduces the current that can be sustained thermally in a small SOT-223 implementation.
Applications / Application Fit
- 5 V class input rails regulated to 3.3 V
- General embedded and consumer 3.3 V supply rails
- Designs already standardized on an AMS1117-style SOT-223 footprint
Design Considerations
Verify the actual datasheet for capacitor requirements and pin assignment before a board substitution.
Check junction temperature with the intended copper area, input voltage and continuous load.
Do not assume interchangeability with similarly named AMS1117 parts from another manufacturer; electrical limits and qualification can differ.
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.
