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LD1117DT18TR

LD1117DT18TR

STMicroelectronics
Linear Voltage Regulator IC Positive Fixed 1 Output 800mA DPAK
Active6,765 in stock
Datasheet Digi-Key Compare Prices

Overview

The LD1117DT18TR is a low dropout linear regulator from STMicroelectronics that provides a fixed 1.8V output from input voltages up to 15V. It is capable of delivering up to 800mA of output current and is housed in a DPAK surface mount package for effective thermal dissipation.

Why Choose This Part

This regulator features a high PSRR of 75dB at 120Hz, making it effective at filtering ripple from primary AC-DC stages. It includes built-in thermal and current limiting protection, ensuring robust operation across its 0C to 125C temperature range.

Applications

Digital Logic Power
Provides a stable 1.8V supply for FPGA cores, DSPs, and low-voltage MCU digital rails.
Communication Equipment
Used for powering baseband processors and Ethernet physical layers requiring 1.8V.
Consumer Electronics
Ideal for local regulation in set-top boxes, printers, and gaming consoles where noise rejection is critical.

Key Specifications

PSRR 75dB (120Hz)
Output Type Fixed
Mounting Type Surface Mount
Package / Case TO-252-3, DPAK (2 Leads + Tab), SC-63
Current - Output 800mA
Protection Features Over Current, Over Temperature
Number of Regulators 1
Output Configuration Positive
Operating Temperature 0degC ~ 125degC
Voltage - Input (Max) 15V
Voltage Dropout (Max) 1.2V @ 800mA
Supplier Device Package DPAK
Current - Quiescent (Iq) 10 mA
Voltage - Output (Min/Fixed) 1.8V

Getting Started

When designing with this LDO, ensure a minimum 10uF capacitor is placed on the output for stability, preferably a tantalum or low-ESR electrolytic type as specified in the datasheet. The DPAK tab is electrically connected to the output pin, so thermal layout should include sufficient copper pour area for heat sinking.

Part of 1117 Regulators family » LD1117

LD1117 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Output V Output I PSRR Output Type Temp Range Stock
LD1117DT18TR (this part) Tape & Reel 3-252 1.8V 800mA 120Hz Fixed 0degC ~ 125degC 6,765
LD1117-ADJ 4-261 1.25V — 120Hz Adjustable -40degC ~ 125degC .. 1,570
LD1117AS12TR Tape & Reel 4-261 1.2V 1A 120Hz Fixed 0degC ~ 125degC 57,161

Also Consider

AMS1117-1.8 Advanced Monolithic Systems - A widely available and cost-effective alternative for 1.8V fixed regulation in similar SOT-223 or DPAK packages.
AZ1117CH-1.8TRG1 DIODiodes Incorporated - A pin-compatible 1.8V regulator with high current capability and built-in protection features.