Diodes Incorporated AZ1117ID-2.5TRG1

Overview

AZ1117ID-2.5TRG1 from Diodes Incorporated is a fixed-output 2.5V low-dropout linear regulator in TO252-2 package, delivering up to 1.35A output current with ±1% output voltage accuracy, 1.3V typical dropout at 0.8A, and integrated thermal shutdown. It powers USB devices and PC motherboard auxiliary rails where stable low-voltage regulation under transient load is critical.

For engineers reviewing the AZ1117ID-2.5TRG1 datasheet, AZ1117ID-2.5TRG1 pinout, AZ1117ID-2.5TRG1 application, or AZ1117ID-2.5TRG1 equivalent, key selection criteria include dropout voltage at 0.8A, PSRR at 120Hz, RMS output noise (% of VOUT), thermal shutdown junction temperature, and compatibility with low-ESR ceramic capacitors.

Technical Context

The AZ1117ID-2.5TRG1 implements a trimmed bandgap reference for precise 2.5V output regulation across -40°C to +125°C junction temperature. Its internal current-limit circuit activates at 1.35A typical, and thermal protection triggers at +160°C with +16°C hysteresis.

It operates with input voltages up to 15V and requires a minimum 10µF ceramic output capacitor with ESR <20Ω. The device maintains 70dB PSRR at 120Hz with 3V headroom and 300mA load, and exhibits 0.003% RMS output noise (10Hz–10kHz) referenced to VOUT.

Key Specifications

Pinout & Package

Package: TO252-2 (Type CJ), surface-mount, thermally enhanced plastic package with exposed drain pad for improved heat dissipation (θJA = 70°C/W with heatsink).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU-2.5 and TLV1117-25CDCY, the AZ1117ID-2.5TRG1 delivers optimal balance of 1.35A output, 70dB PSRR, and TO252-2 thermal performance for industrial-grade 2.5V rails where both current and noise matter.

Availability

AZ1117ID-2.5TRG1 is available at Aetrix Electronics and suitable for USB peripheral power, PC motherboard auxiliary rails, and industrial sensor interfaces requiring stable component supply across extended temperature ranges.

Supply support for AZ1117ID-2.5TRG1 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 and signal integrity solutions.

The AZ1117I series targets industrial and commercial applications needing robust, low-noise LDOs with wide temperature operation and ceramic capacitor compatibility.

FAQ

What is the minimum input voltage required for stable 2.5V output at 1A load?

The AZ1117ID-2.5TRG1 requires VIN ≥ VOUT + VDROP. At 1A load, maximum dropout is 1.4V (TO252-2), so minimum input is 3.9V. For guaranteed operation across temperature and process variation, design with ≥4.0V input headroom.

Can this regulator be used with a 4.7µF ceramic output capacitor?

No. The datasheet mandates a minimum 10µF ceramic output capacitor with ESR <20Ω for stability. Using 4.7µF risks oscillation or poor transient response, especially under load steps. Always meet the 10µF minimum requirement.

Does the GND pin require a dedicated thermal pad connection on the PCB?

Yes. Pin 3 (GND) connects internally to the exposed drain pad. This pad must be soldered to a large copper pour with multiple thermal vias to achieve the specified θJA = 70°C/W with heatsink; omitting this compromises thermal performance and current capability.

How does the thermal shutdown hysteresis affect recovery behavior after an overtemperature event?

After thermal shutdown triggers at +160°C, the device remains off until junction temperature falls to +144°C (+16°C hysteresis). This prevents rapid on-off cycling during sustained overload, allowing safe cooldown before resuming regulation.