NCP1117ST33
Compact SOT-223 LDO voltage regulators, fixed 3.3V, 1A output
Manufacturer： ['onsemi', 'rochester', 'lrc']
series introduction
# NCP1117ST33 Product Series Introduction
## 1. Overview
The NCP1117ST33 is a highly reliable and widely - used series of low - dropout (LDO) voltage regulators. These regulators are designed to provide a stable and precise output voltage, making them an essential component in a vast array of electronic devices. They are part of ON Semiconductor's product portfolio, leveraging the company's expertise in power management solutions to offer high - performance and cost - effective voltage regulation.
## 2. Key Features
### 2.1 Low Dropout Voltage
One of the most significant features of the NCP1117ST33 series is its low dropout voltage. Dropout voltage is the minimum voltage difference between the input and output voltages required for the regulator to maintain a stable output. For the NCP1117ST33, it can operate with a relatively small voltage differential, which is crucial in battery - powered applications. This allows the device to continue providing a stable 3.3V output even as the battery voltage gradually decreases, thus extending the battery life and improving the overall efficiency of the system.
### 2.2 High Output Current Capability
The NCP1117ST33 can deliver a maximum output current of up to 1A. This high - current capability makes it suitable for powering a wide range of components, including microcontrollers, digital signal processors (DSPs), and other power - hungry integrated circuits. Whether it's a small - scale embedded system or a more complex industrial control unit, the NCP1117ST33 can meet the power requirements of various loads.
### 2.3 Excellent Line and Load Regulation
Line regulation refers to the ability of the regulator to maintain a constant output voltage when the input voltage changes, while load regulation is about keeping the output voltage stable as the load current varies. The NCP1117ST33 offers excellent line and load regulation characteristics. It can precisely control the output voltage within a tight tolerance, typically ±1% over a wide range of input voltages and load currents. This ensures that the connected electronic components receive a stable and accurate power supply, which is essential for their proper operation and reliability.
### 2.4 Thermal Over - Protection
To prevent damage due to excessive heat, the NCP1117ST33 is equipped with thermal over - protection circuitry. When the device's temperature rises above a certain threshold, the thermal protection mechanism kicks in and reduces the output current or shuts down the regulator to prevent overheating. This feature enhances the safety and reliability of the regulator, especially in high - power or high - ambient - temperature applications.
### 2.5 Short - Circuit Protection
The series also includes short - circuit protection. In the event of a short - circuit at the output, the regulator limits the output current to a safe level, protecting both the regulator itself and the connected components from damage. This protection mechanism ensures the durability of the device and the overall stability of the power supply system.
## 3. Technical Specifications
### 3.1 Output Voltage
The NCP1117ST33 is specifically designed to provide a fixed output voltage of 3.3V. This standard voltage is commonly used in modern electronic systems, such as those based on 3.3V microcontrollers and digital logic circuits.
### 3.2 Input Voltage Range
It can accept an input voltage in the range of typically 4.75V to 12V. This wide input voltage range allows the NCP1117ST33 to be used in various power supply scenarios, including those powered by batteries, wall adapters, or other DC power sources.
### 3.3 Dropout Voltage
The dropout voltage of the NCP111
Images for reference
SOT223-3L
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