STMicroelectronics STLQ50C33R Linear Voltage Regulator IC - 3.3V Fixed Output, 50mA SOT323-5 Package

The STMicroelectronics STLQ50C33R linear voltage regulator represents a critical solution for engineers seeking reliable power management in compact electronic designs. This ultra-low-power regulator combines precision engineering with robust protection features, making it ideal for battery-powered devices, portable instrumentation, and automotive systems where space and efficiency matter most. With its fixed 3.3V output and SOT323-5 package, this IC addresses modern design challenges while maintaining exceptional performance across diverse operating conditions.

Technical Excellence in Power Regulation

At its core, the STLQ50C33R delivers precise voltage regulation through a sophisticated CMOS architecture that minimizes power loss. The device maintains a stable 3.3V output while accepting input voltages up to 12V, providing designers with ample headroom for various power supply configurations. Its 0.7V dropout voltage at 50mA load current ensures optimal performance even in low-voltage scenarios, while the 5µA quiescent current makes it particularly well-suited for energy-conscious applications.

Advanced Protection and Stability

Beyond its electrical specifications, the STLQ50C33R incorporates multiple safety mechanisms to ensure long-term reliability. Integrated thermal shutdown and overcurrent protection prevent damage under fault conditions, while the 30dB PSRR (Power Supply Rejection Ratio) at 120Hz maintains output stability in noisy environments. The device's surface-mount SOT323-5 package combines compact dimensions with efficient thermal dissipation, enabling use in space-constrained applications without compromising performance.

Key Performance Features

The regulator's CMOS output stage delivers exceptional line and load regulation, maintaining voltage accuracy within tight tolerances despite varying operating conditions. Its wide operating temperature range (-40°C to 125°C) makes it suitable for both industrial and automotive environments. The device's ultra-low quiescent current (5µA typical) and shutdown current (6µA max) enable extended battery life in portable devices, while the fixed output voltage eliminates the need for external resistor networks.

Design Flexibility and Applications

Engineers will appreciate the STLQ50C33R's versatility across multiple domains. Its combination of low dropout voltage, high PSRR, and thermal protection makes it ideal for:

• Portable medical devices requiring stable power supplies
• Automotive sensor interfaces needing robust voltage regulation
• Industrial control systems operating in harsh environments
• Consumer electronics with space and power constraints
• Wireless communication modules requiring clean voltage rails

The SOT323-5 package's small footprint (comparable to SC-70 and TSSOP variants) allows implementation in dense PCB layouts while maintaining compatibility with standard surface-mount assembly processes.

Reliability and Compliance

As part of STMicroelectronics' extensive power management portfolio, the STLQ50C33R meets rigorous industry standards for quality and reliability. The device's active product status ensures long-term availability for production systems, while its tape-and-reel packaging facilitates automated manufacturing processes. Designers can implement this regulator with confidence in its ability to meet automotive, industrial, and consumer electronics requirements.

Tags: Voltage Regulator IC, Low Dropout Regulator, 3.3V Fixed Output, SOT323-5 Package, Electronic Components