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NCP1117ST12T3G

ONNCP1117ST12T3G

onsemi
Linear Voltage Regulator IC Positive Fixed 1 Output 1A SOT-223
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Overview

The NCP1117ST12T3G is a low dropout positive fixed voltage regulator capable of delivering over 1.0 A of output current. It provides a stable 12V output from an input voltage up to 20V, making it a reliable choice for local on-card regulation. The device includes internal current limiting, thermal shutdown, and safe operating area protection to ensure robustness in demanding environments.

Why Choose This Part

This regulator features a low 1.2V maximum dropout at 800mA, allowing for efficient operation with relatively low input-to-output voltage differentials. It requires no minimum load for stability on fixed voltage versions and has been trimmed to a high precision of +/- 1.0 percent at the reference level.

Applications

Industrial Control Systems
Providing localized 12V rails for sensors and actuators from a higher voltage DC bus.
Post-Regulation for Switching Supplies
Reducing ripple and noise from 15V or 18V switching regulators to create a clean 12V analog supply.
Consumer Electronics Power Management
Main power regulation in set-top boxes or networking equipment requiring a steady 1A 12V rail.

Key Specifications

PSRR 54dB (120Hz)
Output Type Fixed
Mounting Type Surface Mount
Package / Case TO-261-4, TO-261AA
Current - Output 1A
Protection Features Over Current, Over Temperature
Number of Regulators 1
Output Configuration Positive
Operating Temperature 0degC ~ 125degC
Voltage - Input (Max) 20V
Voltage Dropout (Max) 1.2V @ 800mA
Supplier Device Package SOT-223
Current - Quiescent (Iq) 10 mA
Voltage - Output (Min/Fixed) 12V

Getting Started

To implement this device, place a 10 uF tantalum or electrolytic capacitor on the output to ensure stability and improve transient response. Ensure the SOT-223 package tab is soldered to a large copper area on the PCB for effective heat dissipation, as the device is rated for operation up to 125 degrees Celsius.

Also Consider

LM1117MP-5.0 TITexas Instruments - An industry-standard alternative if a 5V output version is needed in the same SOT-223 footprint.
LD1117S12TR STMicroelectronics - A direct equivalent 12V fixed LDO in the SOT-223 package with similar 800mA to 1A current capabilities.