AP1117E33G-13 DIODES Linear Voltage Regulator IC Guide

1. Introduction to Stable Power Regulation

In the intricate world of electronics, a stable and reliable power supply isn’t just a luxury; it’s a fundamental necessity. From powering delicate microcontrollers to ensuring the consistent operation of high-speed bus terminations, voltage regulation plays a critical role. Unstable power can lead to system malfunctions, data corruption, and even permanent damage to components. This is where Linear Voltage Regulators come into play, offering a simple yet effective solution for delivering clean, consistent voltage to sensitive circuits.

Among the vast array of available regulators, the DIODES Incorporated AP1117E33G-13 stands out as a robust and widely utilized component. This particular device, a positive fixed linear voltage regulator, is engineered to provide a stable 3.3V output with a generous 1A current capability. Its low drop out voltage and comprehensive protection features make it an ideal choice for a multitude of modern electronic designs. Understanding its capabilities and proper application can significantly enhance the reliability and performance of your projects.

 

2. Unveiling the AP1117E33G-13 Regulator

The AP1117E33G-13 is a specific variant within the popular AP1117 series of low drop out (LDO) regulators manufactured by Diodes Incorporated. What sets this particular model apart is its fixed 3.3V output, making it highly suitable for powering digital logic, microcontrollers, and various peripheral components that operate at this common voltage level. Designed for efficiency and stability, it addresses the critical need for a well-regulated supply in applications where input voltage can fluctuate but a steady output is paramount.

At its core, the AP1117E33G-13 functions as a positive voltage regulator, meaning it takes a higher input voltage and steps it down to a desired positive output voltage. Its “low drop out” characteristic is particularly noteworthy. This refers to its ability to maintain regulation even when the input voltage is only slightly higher than the desired output voltage. For the AP1117E33G-13, the maximum dropout voltage is specified at an impressive 1.3V to 1.4V at full load current, which translates to greater efficiency and flexibility in power supply design, especially for battery-powered devices or systems with limited voltage headroom. This performance makes it an excellent choice for converting a 5V or 6V input from a USB port or a battery pack directly to a stable 3.3V for your circuits.

3. The Price Range of  AP1117E33G-13

According to the latest market conditions, the price range for AP1117E33G-13 is approximately USD0.035 – USD0.125 per piece. The specific price may vary depending on the following factors:

Purchase quantity (bulk purchases typically offer more favorable unit prices)

Supplier and regional differences

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4. Key Technical Specifications

   

Delving into the technical details reveals why the AP1117E33G-13 is a preferred choice for many engineers. Its specifications highlight a balance of performance, robustness, and ease of integration into various electronic systems.

General Characteristics

The AP1117E33G-13 is primarily known for its fixed 3.3V output voltage. While other variants in the AP1117 series offer adjustable outputs or different fixed voltages (such as 1.5V, 1.8V, 2.5V, or 5.0V), this specific model is pre-configured for 3.3V, simplifying design by eliminating external resistors for voltage division. It boasts a maximum output current of 1A, making it capable of supplying power to a wide range of components, from individual Integrated Circuits (ICs) to entire sub-systems.

Input and Output Voltage Range

The device operates effectively with an input voltage range of 6.4V to 18V. This broad input tolerance ensures compatibility with various power sources, including standard 9V or 12V adapters , and regulated power lines within industrial equipment. The fixed output is precisely 3.3V, ensuring consistent power delivery to sensitive loads.

Dropout Voltage and Power Dissipation

As a Low Drop Out (LDO) regulator, the AP1117E33G-13 exhibits a maximum dropout voltage of 1.3V (or typically 1.4V according to some datasheets) at its full 1A load . This means that for a 3.3V output, the input voltage needs to be at least 4.6V (3.3V + 1.3V) for the regulator to maintain stable operation. The device is also designed to handle significant power dissipation, supporting a maximum of 15W. This high power rating, coupled with built-in thermal shutdown, provides robust protection against overheating under demanding conditions.

Package and Environmental Compliance

The AP1117E33G-13 comes in a SOT-223 surface-mount package. This compact form factor with gull-wing terminals is widely used in modern PCB designs, allowing for efficient use of board space. Furthermore, the component is RoHS compliant and utilizes “Green” molding compound (specifically for SOT223-3L and TO252-3L packages), indicating its adherence to environmental standards regarding hazardous substances. It is suitable for operation across a wide industrial temperature range, typically from 0°C to 125°C.

Here’s a concise overview of its key specifications:

Specification	Value (AP1117E33G-13)	Benefit
Output Voltage	3.3V (Fixed)	Ideal for digital logic & microcontrollers
Output Current	1A (Maximum)	Powers a variety of components
Input Voltage Range	6.4V to 18V	Wide compatibility with power sources
Dropout Voltage	1.3V – 1.4V @ 1A	Efficient regulation with small Vin-Vout difference
PSRR (Power Supply Rejection Ratio)	60dB	Good noise rejection for clean output
Maximum Power Dissipation	15W	Handles significant loads without failure
Operating Temperature	0 °C to 125°C	Suitable for commercial & industrial environments
Package Type	SOT-223	Compact surface-mount for modern PCBs
Compliance	RoHS, Lead-Free, “Green” Compound	Environmentally friendly & regulatory compliant

5. AP1117E33G-13 Datasheet Download

• AP1117E33G-13 Datasheet: AP1117E33G-13

 

6. Advantages & Design Considerations

Choosing the AP1117E33G-13 for your power management needs offers several distinct advantages, alongside some crucial design considerations to ensure optimal performance.

Key Advantages

• Excellent Output Stability:The fixed 3.3V output ensures a highly stable voltage supply, crucial for sensitive digital and analog circuits.
• Low DropOut Voltage: With a dropout of 1.3V at full load, it minimizes power loss and extends battery life in portable applications , allowing for efficient use of input voltage headroom.
• High Output Current:A 1A output capability makes it versatile for a wide range of applications, from single ICs to multiple components.
• Built -in Protection Features:Integrated thermal shutdown and output current limiting provide robust protection against overheating and over-current conditions, enhancing the longevity and reliability of your circuit.
• Fast Transient Response:The device can quickly respond to sudden changes in load current, maintaining stable output voltage even during dynamic operations.
• Good Noise Rejection:A Power Supply Rejection Ratio (PSRR) of 60dB helps filter out input supply noise, providing a cleaner output voltage.
• Compact Package:The SOT-223 package is ideal for space-constrained applications, offering a small footprint on the PCB.
• Reliable Manufacturer:Diodes Incorporated is a well-regarded manufacturer, ensuring quality and consistent product performance, backed by rigorous quality control standards like ERAI and AS6081.

Design Considerations

• Heat Dissipation:While the AP1117E33G-13 has a high power dissipation rating of 15W and thermal shutdown, it’s crucial to consider heat management. The actual power dissipated (P_diss) can be calculated as (V_in – V_out) * I_out. For example, if V_in is 12V and I_out is 1A, P_diss = (12V – 3.3V) * 1A = 8.7W. At this level, proper PCB layout with sufficient copper pour for heat sinking, or even an external heatsink, might be necessary to keep the junction temperature within limits and prevent the thermal shutdown from activating.
• Input and Output Capacitors:Although the datasheet for the AP1117 series generally recommends input and output capacitors for stability and transient response, the exact values depend on the application and load characteristics. Typically, a ceramic capacitor (e.g., 1µF to 10µF) on both the input and output is recommended to improve transient response and reduce noise. Place these capacitors as close as possible to the regulator’s pins.
• Grounding:A solid ground plane is essential for maintaining stability and minimizing noise in the power delivery network.
• Maximum Input Voltage:Always ensure that your input voltage does not exceed the absolute maximum rating of 18V to prevent damage to the device.
• Current Limiting:Understand that the built-in current limit will protect the device, but it will also cause the output voltage to drop if the load attempts to draw more than 1A. Design your circuit to ensure the load current remains within the 1A specified maximum for stable 3.3V output.

 

7. Versatile Applications

The robustness, stability, and specific 3.3V output of the AP1117E33G-13 make it suitable for a broad spectrum of electronic applications across various industries.

• High-Speed Bus Termination:In digital systems, maintaining signal integrity on high-speed data buses requires precise voltage termination. The AP1117E33G-13 can provide the stable 3.3V needed for terminating resistors, preventing reflections and ensuring reliable data transmission.
• 3V Logic Supply:Modern microcontrollers, FPGAs, DSPs, and other digital ICs often operate on a 3.3V supply. This regulator is an ideal choice for providing a clean and consistent power rail for such components, ensuring their optimal performance and longevity.
• VGA Cards and Graphics Processors:While specific implementations vary, voltage regulators like the AP1117E33G-13 are frequently used within the power management subsystems of graphics cards. They help supply stable power to various logic circuits, memory modules, and other peripherals on the card .
• Networking Equipment:Routers, modems, and network switches often require multiple regulated voltage rails. The 3.3V fixed output is commonly used for Ethernet controllers, Wi-Fi modules, and processor logic within these devices.
• Consumer Electronics:From set-top boxes and DVD or Blu-ray players to smart home devices and portable gadgets, the need for a reliable 3.3V power source is ubiquitous . The AP1117E33G-13’s compact size and robust features make it a strong candidate for these applications.
• Industrial Control Systems:In industrial environments, where power supplies can be noisy or prone to fluctuations, the AP1117E33G-13’s good noise rejection and thermal protection features make it suitable for powering sensors, actuators, and control logic.
• USB-Powered Devices:When designing devices powered by a 5V USB source, the AP1117E33G-13 can efficiently step down the 5V to a stable 3.3V for internal circuitry , given its low dropout characteristic.

Its ease of integration, coupled with its reliable performance, solidifies the AP1117E33G-13’s position as a workhorse in power management for a diverse array of electronic designs.

 

8. AP1117E33G-13 FAQs

9. Summary

The Diodes Incorporated AP1117E33G-13 is a highly reliable and efficient positive fixed 3.3V linear voltage regulator. With its robust 1A output current capability, exceptionally low drop out voltage, and integrated protection features like thermal shutdown and current limiting, it stands as a cornerstone component for stable power delivery in diverse electronic systems. Whether you’re designing for high-speed bus terminations, 3.3V logic circuits, or general power management in consumer and industrial applications, this LDO offers a compelling combination of performance, compact packaging, and environmental compliance. By understanding its specifications and considering appropriate design practices, engineers can confidently integrate the AP1117E33G-13 to ensure the stable and efficient operation of their valuable electronic designs.

 

Key Takeaways

• The AP1117E33G-13 is a fixed 3.3V, 1A Low Drop Out (LDO) linear voltage regulator from Diodes Incorporated.
• It boasts a low dropout voltage of 1.3V-1.4V at full load, enhancing efficiency and battery life.
• Key features include thermal shutdown, output current limiting, fast transient response, and good noise rejection ( 60dB PSRR), ensuring robust and stable operation.
• Packaged in a compact SOT-223, it’s ideal for space-constrained PCB designs and operates from 6.4V to 18V input.
• Widely used in applications such as 3V logic supply, high-speed bus termination, VGA cards, and various consumeror industrial electronics.