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LM1117MPX-3.3/NOPB

800mA LDO, 3.3V fixed, 1.2V dropout, SOT-223, +/-1% accuracy

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Manufacturer Part：

LM1117MPX-3.3/NOPB

Package：

SOT-223-4 (6.7 x 3.7 x 1.7 mm)

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Description

Product Overview

The LM1117MPX-3.3/NOPB from Texas Instruments is an 800mA low-dropout linear regulator with a fixed 3.3V output in a SOT-223 surface-mount package. Featuring 1.2V dropout at 800mA and +/-1% output accuracy, it is widely used for point-of-load regulation in digital systems.

Key Specifications

Output Voltage 3.3V (fixed)
Output Current 800mA
Dropout Voltage 1.2V @ 800mA
Input Voltage Max 15V
Output Accuracy +/-1%
Line Regulation 0.2% max
Load Regulation 0.4% max
Operating Temperature 0°C ~ 125°C

Features

  • 800mA output current capability
  • 1.2V dropout at full load
  • +/-1% output voltage accuracy
  • Current limiting and thermal shutdown
  • Zener-trimmed bandgap reference
  • SOT-223 space-saving package

Applications

  • 3.3V point-of-load regulation
  • FPGA and CPLD core power
  • Post-regulation after DC-DC converters
  • Instrumentation and test equipment
  • Embedded system power supplies

The LM1117MPX-3.3/NOPB is an 800mA low-dropout linear regulator from Texas Instruments, providing a fixed 3.3V output with +/-1% accuracy ensured by a Zener-trimmed bandgap reference. The 1.2V dropout voltage at 800mA allows operation with minimal headroom, while the wide input range (up to 15V) provides flexibility in power supply design. Built-in current limiting and thermal shutdown protect both the device and the load. The SOT-223 package offers a compact footprint with adequate thermal performance for moderate dissipation applications.

The LM1117 uses a PNP pass element to achieve low dropout voltage. An error amplifier compares a divided-down version of the output voltage with an internal bandgap reference (trimmed by Zener zapping for +/-1% accuracy). The amplifier drives the PNP pass transistor base to regulate the output. When the input-output differential falls below the dropout voltage, the PNP saturates and output tracks input minus Vdropout. Current limiting activates when load current exceeds the safe operating area, and thermal shutdown disables the output when junction temperature exceeds approximately 160C.

Pin Name Type Function
1 GND/ADJ Ground Ground (fixed version)
2 VOUT Output Regulated 3.3V output
3 VIN Input Input voltage (up to 15V)
4 VOUT (Tab) Output Output / Heatsink tab
  • 3.3V rail generation from 5V supply in digital systems
  • FPGA/CPLD I/O power regulation
  • Post-regulation after switching converters for noise-sensitive loads
  • Embedded processor and peripheral power
  • Battery-powered device regulation
Manufacturer Part Number Package Notes
TI TLV1117LV33DCYR SOT-223 Lower dropout, newer alternative
onsemi NCP1117ST33T3G SOT-223 Pin-compatible, 800mA
Microchip TC2117-3.3VDBTR SOT-223 800mA, low Iq
Diodes Inc AZ1117CH-3.3TRG1 SOT-223 1A, 3.3V LDO
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We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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