LDO Voltage Regulator, Fixed 1.2V, 800mA, SOT-223-3, STMicroelectronics

The STMicroelectronics LD1117S12TR is a low-dropout voltage regulator with a fixed 1.2V output voltage, capable of delivering up to 800mA of output current. It is also available as an adjustable version with a reference voltage of 1.25V, offering design flexibility for a wide range of applications.

This regulator utilises an NPN pass transistor to ensure high efficiency, as quiescent current flows predominantly into the load, unlike PNP-based designs. A standard 10µF capacitor is sufficient for stability. On-chip trimming enables an output voltage tolerance of ±1% at 25°C, ensuring precise and reliable operation.

Key Features

• Low dropout voltage: 1.1V typical
• Input voltage range: 1.4V to 15V
• Output current: 800mA maximum
• Supply voltage rejection: 75dB typical
• Internal current and thermal limiting for protection
• Suitable for SCSI-2 active termination
• Surface mount package: SOT-223-3 (3 pins)
• Operating temperature range: 0°C to 125°C
• MSL 1 - unlimited floor life

The LD1117S12TR is a reliable solution for power management applications, offering stable output, robust protection, and compact SOT-223 packaging. Its tight voltage tolerance and low dropout make it suitable for precision electronics, including SCSI-2 termination and general-purpose power regulation.