Diodes Incorporated AZ1117D-5.0TRE1

Overview

AZ1117D-5.0TRE1 from Diodes Incorporated is a fixed-output 5.0V, 1A low-dropout linear regulator in TO252-2 (3) package with 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 microcontroller core supplies, USB peripheral power rails, and FPGA I/O banks requiring clean, low-noise DC.

For engineers reviewing the AZ1117D-5.0TRE1 datasheet, AZ1117D-5.0TRE1 pinout, AZ1117D-5.0TRE1 application, or AZ1117D-5.0TRE1 equivalent, key selection criteria include dropout voltage at 1A, thermal resistance (θ_JA = 100°C/W), GND-referenced fixed-output topology, and RoHS-compliant lead-free packaging for industrial and computing applications.

Technical Context

The AZ1117D-5.0TRE1 uses an internal trimmed bandgap reference and PNP pass transistor to achieve 5.0V output with ±1% initial accuracy and 0.5% temperature stability. Its control loop maintains regulation across input voltages from 6.5V to 12V while sustaining 1A output current without external compensation.

Thermal protection activates at +150°C junction temperature with +25°C hysteresis, and current limit is factory-trimmed to 1.25–1.35A. The device operates from –40°C to +125°C junction temperature and requires only 10µF input and 22µF output ceramic or tantalum capacitors for stability.

Key Specifications

Pinout & Package

TO252-2 (3) surface-mount package with exposed thermal pad (pin 2 connected to GND for optimal heat dissipation). Pin 1: INPUT, Pin 2: GND, Pin 3: OUTPUT.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with MIC29302WU-5.0 and LD1117S50TR, the AZ1117D-5.0TRE1 offers tighter output accuracy (±1% vs ±2%), optimized thermal pad layout for TO252-2 (3), and documented 1.15V dropout at 1A-making it preferred for noise-sensitive, thermally constrained 5V point-of-load applications.

Availability

AZ1117D-5.0TRE1 is available at Aetrix Electronics and suitable for PC motherboard VRMs, LCD monitor logic supplies, industrial PLC I/O modules, and network interface cards requiring stable component supply and long-term manufacturability.

Supply support for AZ1117D-5.0TRE1 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 solutions for industrial, computing, and consumer markets.

The AZ1117 series targets cost-effective, robust local regulation in space-constrained systems-designed specifically for legacy and new-design applications needing reliable 5V, 3.3V, or adjustable outputs with integrated protection.

FAQ

What is the minimum input voltage required for AZ1117D-5.0TRE1 to maintain regulation at 1A?

The minimum input voltage is 6.5V, derived from the 5.0V output plus 1.15V maximum dropout at 1A load. Operation below this voltage causes dropout mode, where output tracks input minus saturation voltage. Input must remain ≥6.5V under worst-case load and temperature conditions to guarantee regulation.

Can AZ1117D-5.0TRE1 be used with ceramic output capacitors?

Yes-ceramic capacitors ≥22µF with X5R or X7R dielectric are fully supported and recommended for improved transient response and ESR stability. The device does not require minimum ESR, unlike older LDO architectures, making it compatible with low-ESR ceramics without oscillation risk.

Is thermal pad connection mandatory for AZ1117D-5.0TRE1 in TO252-2 (3) package?

Yes-the exposed thermal pad (pin 2) must be soldered to a dedicated PCB copper pour tied to GND. This connection reduces θ_JA from 135°C/W (no pad) to the specified 100°C/W and prevents thermal shutdown during 1A continuous operation. Omitting the pad risks premature shutdown above ~600mA at +70°C ambient.

How does the current limit behave during short-circuit conditions?

Under short-circuit, the AZ1117D-5.0TRE1 limits output current to 1.25–1.35A (typical 1.3A), dissipating up to ~6.5W at 5V output. Combined with thermal shutdown at +150°C, this creates a safe, self-limiting fault state-no external current-sense resistor or foldback circuitry is needed for basic protection.