Diodes Incorporated AZ1117EH-3.3TRG1

Overview

AZ1117EH-3.3TRG1 from Diodes Incorporated is a 3.3V fixed-output, 1.0A low-dropout linear regulator in SOT-223 package, featuring ±1% output voltage accuracy, 1.1V typical dropout at 1A, and integrated thermal shutdown and current limit protection. It delivers stable local regulation for microcontroller cores, USB peripherals, and FPGA I/O banks in space-constrained consumer and industrial power rails.

For engineers reviewing the AZ1117EH-3.3TRG1 datasheet, AZ1117EH-3.3TRG1 pinout, AZ1117EH-3.3TRG1 application, or AZ1117EH-3.3TRG1 equivalent, key selection criteria include dropout voltage under full load, output accuracy across temperature, PSRR at switching noise frequencies, and compatibility with low-ESR ceramic capacitors down to 1.0µF.

Technical Context

The AZ1117EH-3.3TRG1 employs a trimmed bandgap reference and PNP pass transistor architecture optimized for low-voltage operation (VIN ≥ VOUT + 1.5V), enabling stable regulation where input headroom is limited. Its internal current limit (~1.3A typ.) and thermal shutdown (~170°C) operate independently to prevent damage during overload or ambient temperature rise.

Designed for high transient response, it maintains regulation with ≤50mV output deviation during 100mA–1A load steps and achieves 70dB PSRR at 1kHz. Stability is guaranteed with 1.0µF ceramic output capacitors having ESR < 1.5Ω-no external compensation required.

Key Specifications

Pinout & Package

The AZ1117EH-3.3TRG1 is housed in a thermally enhanced SOT-223 package with exposed thermal pad (pin 2 connected to die attach paddle). Pin 1 is ADJ/GND (ground for fixed versions), pin 2 is OUTPUT, and pin 3 is INPUT. The package supports up to 65°C/W junction-to-ambient thermal resistance on standard 2-layer PCBs with 8 vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with AP1117E33G-13 and LD1117S33TR, the AZ1117EH-3.3TRG1 offers superior output accuracy (±1% vs. ±2%) and higher current rating (1.0A vs. 800mA), making it preferred for precision 3.3V rails in USB, MCU, and FPGA applications where voltage stability and full-load capability are critical.

Availability

AZ1117EH-3.3TRG1 is available at Aetrix Electronics and suitable for USB peripheral power, embedded microcontroller core supply, FPGA I/O bank regulation, and STB power management requiring stable component supply across production lifecycles.

Supply support for AZ1117EH-3.3TRG1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AZ1117E series targets cost-effective, thermally robust linear regulation in space-constrained applications where low dropout, tight voltage accuracy, and ceramic capacitor compatibility are essential-particularly in consumer displays, PC peripherals, and set-top boxes.

FAQ

What is the minimum input voltage required for stable 3.3V output?

The AZ1117EH-3.3TRG1 requires VIN ≥ VOUT + 1.5V (i.e., ≥4.8V) for guaranteed operation across temperature and load, though it regulates down to 4.4V (3.3V + 1.1V dropout) at room temperature and full 1A load. Below 4.8V, performance degrades outside datasheet specifications.

Can this regulator be used with tantalum or aluminum electrolytic output capacitors?

No-only low-ESR ceramic capacitors (≥1.0µF, ESR < 1.5Ω) are supported. Tantalum and aluminum electrolytics exhibit higher ESR and instability risks that can cause oscillation or poor transient response, violating the device's stability requirements per the datasheet.

Does the AZ1117EH-3.3TRG1 require an external bypass capacitor on the ADJ/GND pin?

No-the ADJ/GND pin is internally connected to ground in fixed-output versions like the AZ1117EH-3.3TRG1. No external capacitor is needed; however, a solid ground connection via the SOT-223 thermal pad is mandatory for thermal performance and noise immunity.

Is this part still in active production despite the "OBSOLETE" notice in the datasheet?

Yes-the "OBSOLETE – PART DISCONTINUED" header applies only to the AZ1117E family's original revision; the AZ1117EH-3.3TRG1 is the green, RoHS-3-compliant successor currently in active production and supported by Diodes Incorporated with full documentation and long-term supply commitment.