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AMS1117-3.3

1A LDO, 3.3V fixed, 1.3V dropout, SOT-223, +/-2% accuracy

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Manufacturer Part：

AMS1117-3.3

Package：

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

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Description

Product Overview

The AMS1117-3.3 is a 1A low-dropout voltage regulator providing a fixed 3.3V output with 1.3V maximum dropout at full load. Available in SOT-223, TO-252, and SOT-89 packages, it is a widely used industry-standard LDO for post-regulation and battery-powered applications.

Key Specifications

Output Voltage 3.3V (fixed, +/-2%)
Output Current 1A
Dropout Voltage 1.1V typ / 1.3V max @ 1A
Input Voltage Max 15V
Line Regulation 0.3% max
Load Regulation 0.5% max
Quiescent Current 10mA max
Package SOT-223 / TO-252 / SOT-89

Features

  • 1A output current with 1.3V dropout max
  • Fixed 3.3V output with +/-2% accuracy
  • On-chip thermal limiting and current limiting
  • Available in multiple surface-mount packages
  • Pin-compatible with LM1117 and other 1117-series LDOs

Applications

  • Post-regulation after switching converters
  • 5V to 3.3V conversion in digital systems
  • Battery charger regulation
  • LCD monitor power supplies
  • Set-top box and PC add-on card power

The AMS1117-3.3 is a 1A low-dropout voltage regulator from Advanced Monolithic Systems (AMS), providing a fixed 3.3V output with guaranteed maximum dropout voltage of 1.3V at full 1A load. The output voltage is trimmed to +/-2% accuracy using on-chip precision trimming. Built-in thermal shutdown and current limiting protect the device under overload conditions. The AMS1117-3.3 is pin-compatible with the industry-standard 1117 family, making it a drop-in replacement for LM1117-3.3, LD1117-3.3, and other 1117-series devices in SOT-223, TO-252, and SOT-89 packages.

The AMS1117-3.3 uses a PNP pass transistor to achieve low dropout voltage. An error amplifier compares a divided-down version of the output voltage with an internal bandgap reference trimmed to +/-1% accuracy. The amplifier drives the PNP pass element to maintain 3.3V at the output. When the input-output differential falls below the dropout voltage, the PNP saturates and the output tracks the input minus the dropout. The on-chip thermal shutdown circuit disables the output when junction temperature exceeds approximately 150C, while current limiting restricts output current to approximately 1.1A under overload conditions.

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
  • 5V to 3.3V regulation in digital and MCU systems
  • Post-regulation after DC-DC switching converters
  • Battery-powered instrumentation and meters
  • PC add-on card and motherboard clock supply
  • LCD monitor and set-top box power rails
Manufacturer Part Number Package Notes
TI LM1117MPX-3.3/NOPB SOT-223 800mA, +/-1% accuracy
onsemi NCP1117ST33T3G SOT-223 1A, 3.3V, pin-compatible
ST LD1117S33TR SOT-223 800mA, 3.3V LDO
Diodes Inc AZ1117CH-3.3TRG1 SOT-223 1A, 3.3V, low cost
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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.

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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