STLQ50C33R

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The STLQ50C33R is a low-dropout linear regulator manufactured by STMicroelectronics, designed for ultra-low power consumption in battery-operated systems. It features a fixed 3.3 V output with a maximum load current of 50 mA and an exceptionally low quiescent current of 3 µA. The device operates within an input voltage range of 2.3 V to 12 V and provides high accuracy with a line regulation of 0.3% and load regulation of 0.15%. It utilizes a PMOS pass element to achieve a dropout voltage of 400 mV at full load. The component is housed in a compact SOT-323-5 surface-mount package and includes internal thermal protection for reliable operation across temperatures from -40°C to +150°C.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Ultra-low quiescent current of 3 µA extends battery life in standby applications
• PMOS pass element ensures excellent dropout performance without increasing power consumption
• Integrated thermal protection safeguards against overheating conditions
• Compact SOT-323-5L package optimizes space efficiency for portable devices

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Battery-powered equipment requiring extended standby times
• Portable consumer electronics with strict space constraints
• Low-power sensor nodes and IoT devices
• Systems demanding minimal supply current during idle states

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific ordering suffix to confirm the exact packaging configuration, such as reel, cut tape, or MouseReel options, as these affect handling and storage requirements. Ensure the selected variant matches the required output voltage tolerance and package type for your PCB layout. Cross-reference the manufacturer's latest datasheet to confirm RoHS compliance status and any recent design changes before finalizing procurement orders.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this regulator when the application prioritizes minimizing static power drain over high current delivery capabilities. The 50 mA output limit suits light loads, while the wide input voltage range accommodates various battery chemistries. Consider the SOT-323-5L footprint for size-constrained designs. Evaluate thermal dissipation needs given the small package size and ensure adequate airflow or copper area for heat spreading if operating near maximum load currents.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This component belongs to the STLQ50 series of low-dropout linear regulators from STMicroelectronics. The series is engineered specifically for BiCMOS technology applications where extremely low supply current is critical. It complements other LDO offerings by focusing on ultra-low quiescent performance rather than high-current capacity, serving niche markets in wearable technology and long-life battery devices.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes within the same family include variants with different fixed output voltages such as STLQ50C18R (1.8 V), STLQ50C25R (2.5 V), and STLQ50C50R (5.0 V). These parts share identical pinouts, packages, and electrical characteristics except for the regulated output voltage. Verify that the system design can accommodate the alternative voltage level before swapping components.