AMS1117-3.3
Manufacturer
Model
AMS1117-3.3
Category
The TWGMC AMS1117-3.3 is a compact linear LDO delivering stable 3.3V output with 1A current capability, optimized for low-power embedded systems. Its 70dB PSRR at 120Hz ensures minimal noise propagation, while overheat protection enhances reliability. Designed for -40°C to +125°C operation, it suits consumer electronics, medical devices, and automotive applications. Proper thermal management and ESD protection are critical for sustained performance.
Reference Pricing
Reference Stock
Specifications
| Dropout Voltage | 1.2V～1.25V |
| Load Regulation | +/-0.5% |
| Operating Temperature Range | -40～+125°C |
| Output Current | 0～1A |
| Output Noise | 50μVrms (typical) |
| Output Voltage Accuracy | +/-1.5% |
| Output Voltage Adjustment Rate | +/-1.2% |
| PSRR | 60dB (typical) |
| Package Type | SOT-223-3L |
| Rated Voltage | 3.3V |
| Transient Response Time | 20μs (typical) |
Function And Role
Core Function
Provide a stable 3.3V output with low dropout characteristics
Key Characteristics
- 70dB Power Supply Rejection Ratio (PSRR) at 120Hz
- 1A maximum output current
- 12V input voltage range
- Overheat protection functionality
- Fixed output configuration
Application Domains
Basic Scenarios
- Consumer electronics (IoT devices, portable gadgets)
- Low-power embedded systems
- Telecommunication equipment power supplies
Extended Scenarios
- Medical devices requiring stable power
- Automotive electronic control units
- Industrial control systems with harsh environments
Precautions
| Soldering | Use proper SOT-223-3L soldering techniques; avoid thermal damage to plastic package |
| Current Limit | Max continuous output current 1A; derate to 0.5A above 70°C |
| Voltage Limit | Input voltage 4.5-12V; output voltage 3.3V fixed |
| Thermal Management | Thermal resistance 50°C/W; require heatsinking for >500mA continuous load |
| Storage | Store in <10% relative humidity; avoid exposure to temperatures >125°C |
| Risk Warnings |
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Alternative Model Params
- Output voltage (must match 3.3V requirement)
- Input voltage range (4.5-12V compatibility)
- Max output current (1A equivalent or higher)
- PSRR performance (≥60dB at 100Hz minimum)
- Package type (SOT-223-3L dimensional match required)
Design Recommendations
| Layout | Maintain ≥2mm trace width for output current paths |
| Thermal | Add 10mm copper foil heat sink for continuous operation >500mA |
| Compatibility | Verify input capacitor stability with 10μF ceramic capacitor parallel to output |
| Testing | Perform 100-hour burn-in test at max load and 85°C ambient |
Market Positioning
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| Weaknesses |
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