Diodes Incorporated AZ1117H-2.5TRE1

Overview

AZ1117H-2.5TRE1 from Diodes Incorporated is a fixed-output 2.5V, 1A low-dropout linear regulator in SOT223 package, featuring 1.15V dropout at full load, ±1% output voltage accuracy over temperature, and integrated thermal shutdown and current limiting. It delivers stable local regulation for FPGA core supplies, USB peripheral power rails, and embedded microcontroller I/O domains.

For engineers reviewing the AZ1117H-2.5TRE1 datasheet, AZ1117H-2.5TRE1 pinout, AZ1117H-2.5TRE1 application, or AZ1117H-2.5TRE1 equivalent, key selection criteria include dropout voltage at 1A, thermal resistance (θ_JA = 120°C/W), load regulation (≤10 mV), PSRR (≥60 dB at 120 Hz), and SOT223 lead-free RoHS compliance.

Technical Context

The AZ1117H-2.5TRE1 uses a trimmed bandgap reference and PNP pass transistor architecture to achieve 1% initial output accuracy and maintain regulation down to 1.15V input-to-output differential at 1A. Its internal current limit is factory-trimmed to 1.25–1.35A and thermal shutdown activates at +150°C with +25°C hysteresis.

It operates across –40°C to +125°C junction temperature, supports input voltages up to 15V, and requires only 10µF minimum output capacitance (tantalum or ceramic) for stability. Quiescent current remains 5–10 mA across load and input conditions.

Key Specifications

Pinout & Package

SOT223 package: 4-pin thermally enhanced surface-mount outline with exposed thermal pad (pin 4 connected to VOUT for optimal heat dissipation). Pin 1 = OUTPUT, Pin 2 = INPUT, Pin 3 = GND.

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 TLV1117-2.5, the AZ1117H-2.5TRE1 balances 1A capability, 1.15V dropout, ±1% accuracy, and SOT223 manufacturability-making it optimal for cost-sensitive industrial and computing boards where thermal margin and precision outweigh ultra-low IQ or higher current needs.

Availability

AZ1117H-2.5TRE1 is available at Aetrix Electronics and suitable for PC motherboard VRMs, LCD monitor TCON power, graphic card I/O rails, and industrial PLC modules requiring stable component supply with guaranteed long-term sourcing.

Supply support for AZ1117H-2.5TRE1 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 power management, signal integrity, and protection devices for industrial, computing, and consumer markets.

The AZ1117 series was designed as a pin-compatible, high-reliability replacement for legacy low-dropout regulators-targeting cost-effective, thermally efficient local regulation in space-constrained PCBs across computing and industrial applications.

FAQ

What is the minimum input voltage required for AZ1117H-2.5TRE1 to regulate at 1A?

The minimum input voltage is 3.65V: derived from V_OUT + V_DROP = 2.5V + 1.15V. At 1A load and +25°C, dropout is guaranteed ≤1.15V; at higher temperatures or lower currents, dropout decreases. Input must remain ≥3.9V per recommended operating conditions to ensure full specification compliance.

Can AZ1117H-2.5TRE1 be used with ceramic output capacitors?

Yes-unlike older LDOs, the AZ1117H-2.5TRE1 is stable with low-ESR ceramic capacitors ≥10µF. The datasheet confirms compatibility with both tantalum and ceramic types without requiring minimum ESR, simplifying layout and reducing BOM count in modern designs.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches +150°C, the device shuts down completely. After cooling by ≥25°C (to ≤+125°C), it automatically recovers and resumes regulation. This hiccup-mode protection prevents permanent damage while maintaining system-level fault tolerance without external circuitry.

Is AZ1117H-2.5TRE1 suitable for automotive applications?

No-it is rated for –40°C to +125°C junction temperature but is not AEC-Q200 qualified. Diodes Incorporated explicitly labels it for industrial/commercial use only; automotive designs require the AZ1117I or AZ1117C variants, which undergo additional stress testing and qualification.