Item specifics
Description
The NCP1117ST33T3G is a fixed-output positive low dropout (LDO) linear voltage regulator from onsemi's NCP1117 series, housed in a SOT-223 surface-mount package. It provides a fixed 3.3V output requiring no external resistors, delivering output current in excess of 1.0A with a maximum dropout voltage of only 1.2V at 800mA and supporting input voltages up to 20V. On-chip trimming adjusts the reference/output voltage to ±1.0% accuracy, and internal protection features include output current limiting, safe operating area compensation, and thermal shutdown. The NCP1117ST33T3G is a pin-compatible replacement for the LM1117-3.3 and AMS1117-3.3, widely used in consumer electronics, industrial control, computer peripherals, communication equipment, and battery chargers.
| Model | NCP1117ST33T3G |
| Series | NCP1117 |
| Device Type | Low-Dropout Fixed Output Positive Linear Voltage Regulator (LDO) |
| Output Polarity | Positive |
| Output Voltage | 3.3V (Fixed) |
| Output Current | 1.0 A (Max) |
| Input Voltage (Max) | 20 V |
| Dropout Voltage (Max) | 1.2V @ 800mA (Over Temperature) |
| PSRR | 64dB @ 120Hz |
| Quiescent Current (Iq) | 10 mA (Max) |
| Output Voltage Accuracy | ±1.0% |
| Reference Voltage | 1.25 V |
| Output Noise | 0.003% Vout |
| Number of Outputs | 1 |
| Output Type | Fixed |
| Protections | Output Current Limiting, Safe Operating Area Compensation, Thermal Shutdown |
| Operating Temp (TA) | 0℃ ~ +125℃ |
| Package | SOT-223 |
| Mounting Type | Surface Mount |
Typical Applications
Consumer and Industrial Equipment Point of Regulation
Switching Power Supply Post Regulation
Hard Drive Controllers
Battery Chargers
Set-Top Boxes, Game Consoles, Monitors, VCRs and TVs
Industrial Control and Embedded System 3.3V Power
FAQs:
Q: What are the output voltage and current?
A: Fixed 3.3V output, 1.0A maximum output current. Maximum dropout voltage is 1.2V at 800mA over temperature.
Q: Does this LDO require a minimum load?
A: No. NCP1117 series fixed voltage output devices have no minimum load requirement to maintain regulation, making them ideal for standby or light-load applications.
Q: What protection features are integrated?
A: Output current limiting, safe operating area compensation, and thermal shutdown for device and system safety under abnormal conditions.
Q: What is the PSRR?
A: 64dB at 120Hz, effectively suppressing input supply ripple effects on the output voltage
Q: What are the input and output capacitor requirements?
A: A minimum 1μF ceramic capacitor (X7R or X5R type) is recommended at the input, placed close to the IC. A minimum 10μF ceramic capacitor is recommended at the output; if tantalum or aluminum electrolytic capacitors are used, capacitance should be greater than 22μF with sufficiently low ESR to avoid instability or oscillation.
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