UMW AMS1117-3.3

UMW AMS1117-3.3 | Linear Voltage Regulator IC Positive Fixed 1 Output 1A SOT-223-3L

The AMS1117-3.3 from UMW (Unic Microelectronics) is a high-performance, low-dropout (LDO) linear voltage regulator that delivers a fixed 3.3V output with a maximum output current of 1A. Designed for cost-sensitive applications, this regulator operates with an input voltage range of 4.75V to 12V, making it suitable for both 5V and higher voltage systems. The device features a low dropout voltage (typically 1.1V at 1A load current), ensuring efficient operation even with small input-output differentials. Packaged in a compact SOT-223 surface-mount package, the AMS1117-3.3 provides good thermal performance while minimizing PCB space requirements. With built-in current limiting and thermal shutdown protection, this regulator offers reliable performance for a wide range of electronic applications, particularly in consumer electronics and embedded systems.

The AMS1117-3.3 provides stable voltage regulation (±1% accuracy at 25°C) and maintains good line and load regulation characteristics. Its low quiescent current (typically 10mA) helps maintain efficiency in battery-operated devices. The regulator requires only a small 10μF output capacitor for stability, reducing component count and board space. Additional protection features include internal current limiting and thermal shutdown, which safeguard the device under fault conditions. The AMS1117-3.3 demonstrates excellent transient response to sudden load changes, making it suitable for digital circuits with varying power demands. Its wide operating temperature range (0°C to +125°C) ensures reliable performance in various environmental conditions.

This LDO regulator is widely used in digital set-top boxes, LCD displays, and networking equipment where stable 3.3V power is required. It serves as an excellent power solution for 3.3V microcontrollers (such as 8051 and ARM cores) and memory modules (SDRAM, Flash). The AMS1117-3.3 is commonly implemented in consumer electronics including DVD players, digital cameras, and portable media devices. Its cost-effectiveness makes it popular in industrial control systems, automotive electronics, and telecommunication equipment. The regulator is also frequently used in power supply modules and voltage conversion circuits where a reliable 3.3V source is needed from higher input voltages. Additionally, it finds applications in LED lighting systems and battery charging circuits that require stable voltage references.

Compared to similar LDO regulators, the AMS1117-3.3 offers exceptional value with its combination of performance and affordability. The SOT-223 package provides good thermal characteristics while maintaining a small footprint suitable for space-constrained designs. UMW's mature manufacturing process ensures consistent quality and reliability across production batches. The device's simple implementation (requiring minimal external components) reduces design complexity and BOM cost. With its robust protection features and stable operation under varying load conditions, this regulator provides a dependable power solution for cost-sensitive applications. The AMS1117-3.3's wide availability and competitive pricing make it a preferred choice for high-volume production designs across multiple industries.