Diodes Incorporated AZ1117D-1.5TRE1

Overview

AZ1117D-1.5TRE1 from Diodes Incorporated is a fixed-output 1.5V, 1A low-dropout linear regulator in TO252-2 (3) package, featuring 1.15V dropout at full load, ±1% output voltage accuracy over temperature, integrated thermal shutdown and current limiting, and operation from −40°C to +125°C junction temperature - used for stable local regulation in PC motherboard VRMs and peripheral power rails.

For engineers reviewing the AZ1117D-1.5TRE1 datasheet, AZ1117D-1.5TRE1 pinout, AZ1117D-1.5TRE1 application, or AZ1117D-1.5TRE1 equivalent, key selection criteria include dropout voltage at 1A, thermal resistance (θ_JA = 100°C/W), output voltage tolerance (1.485–1.530V), minimum input voltage margin, and TO252-2 (3) PCB thermal pad layout compatibility.

Technical Context

The AZ1117D-1.5TRE1 implements a bandgap-referenced error amplifier with internal current limit and thermal foldback, delivering regulated 1.5V output without external components. Its trimmed reference ensures 1% initial accuracy and 0.5% temperature stability across −40°C to +125°C.

It operates with input voltages up to 15V and requires only 10µF ceramic or tantalum output capacitance for stability. Dropout is defined at ∆V_OUT = 1%, with 1.15V typical at I_OUT = 1A and T_J = 25°C - enabling use in 3.3V-to-1.5V or 5V-to-1.5V post-regulation where headroom is constrained.

Key Specifications

Pinout & Package

TO252-2 (3) surface-mount package with exposed thermal pad (pin 2 = GND), optimized for PCB heat dissipation. Pin 1: INPUT; Pin 2: OUTPUT/GND (thermal pad connected internally to output); Pin 3: GND (functional ground terminal).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1502E/MB and LD1117S15TR, AZ1117D-1.5TRE1 uniquely balances 1A capability, ±1% accuracy, TO252 thermal performance, and integrated protection - making it optimal for space-constrained, high-reliability embedded power rails.

Availability

AZ1117D-1.5TRE1 is available at Aetrix Electronics and suitable for PC motherboard power delivery, LCD monitor logic supplies, graphic card auxiliary rails, and printer engine control requiring stable component supply across long production lifecycles.

Supply support for AZ1117D-1.5TRE1 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

AZ1117D-1.5TRE1 belongs to the AZ1117 family of low-dropout linear regulators designed for high-accuracy, high-current local regulation in computing, consumer, and industrial equipment where reliability and thermal robustness are essential.

FAQ

What is the minimum input voltage required for AZ1117D-1.5TRE1 to maintain regulation at 1A?

The minimum input voltage is calculated as V_OUT + V_DROP(max) = 1.5V + 1.25V = 2.75V. At 1A and T_J = 125°C, dropout may reach 1.25V per datasheet limits. Therefore, VIN ≥ 2.75V is required to sustain regulation under worst-case thermal and load conditions.

Can AZ1117D-1.5TRE1 be used with ceramic output capacitors?

Yes - the AZ1117D-1.5TRE1 is stable with ceramic capacitors ≥10µF and ESR as low as 10mΩ. Unlike older LDOs, it does not require minimum ESR for phase margin; this simplifies layout and reduces BOM cost versus tantalum alternatives.

How does the TO252-2 (3) package's thermal pad affect PCB layout?

The exposed thermal pad (Pin 2) must be soldered to a dedicated copper pour with ≥4 thermal vias (0.3mm diameter) connecting to inner-layer ground planes. Insufficient copper area raises θ_JA beyond 100°C/W, risking thermal shutdown at >600mA in still air.

Is AZ1117D-1.5TRE1 pin-compatible with other AZ1117 variants in TO252-2 (3)?

Yes - all AZ1117 variants in TO252-2 (3) (e.g., AZ1117D-3.3TRE1, AZ1117D-ADJTRE1) share identical pinout (INPUT–OUTPUT–GND) and footprint. Only the output voltage and marking differ; no layout change is needed when swapping fixed-voltage versions.