Diodes Incorporated AZ1084S2-3.3TRE1

Overview

AZ1084S2-3.3TRE1 from Diodes Incorporated is a fixed-output 3.3V, 5A low dropout linear regulator in TO-263-2 package, featuring 1.3V typical dropout at full load, on-chip thermal limiting, and ±1% output voltage accuracy over 0°C to +125°C junction temperature. It delivers stable post-regulation for switching supplies and powers microprocessor cores in embedded systems.

For engineers reviewing the AZ1084S2-3.3TRE1 datasheet, AZ1084S2-3.3TRE1 pinout, AZ1084S2-3.3TRE1 application, or AZ1084S2-3.3TRE1 equivalent, key selection criteria include dropout voltage at 5A, thermal resistance (θ_JA = 60°C/W), load regulation (≤15 mV), and compatibility with standard TO-263-2 PCB footprints and heatsinking.

Technical Context

The AZ1084S2-3.3TRE1 implements a trimmed band-gap reference with internal resistor divider for fixed 3.3V output, eliminating external feedback components. Its current-limiting circuit triggers at 6.5A and integrates thermal shutdown to protect against sustained overload or high ambient temperatures.

Designed for high-current linear regulation, it operates with input voltages up to 12V and maintains output stability under dynamic load steps from 10mA to 5A. The TO-263-2 package provides low thermal resistance (θ_JC = 4.15°C/W) and exposed tab for direct heatsink attachment.

Key Specifications

Pinout & Package

Package: TO-263-2 (D²PAK-2), surface-mount, thermally enhanced with exposed metal tab (pin 2). Pin 1: INPUT; Pin 2: OUTPUT (tab); Pin 3: ADJ/GND - for fixed 3.3V version, pin 3 is internally connected to GND and must be soldered to ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1084S33G-13 and LD1085V33, the AZ1084S2-3.3TRE1 offers superior thermal autonomy (integrated foldback), tighter dropout (1.3V typ), and optimized SMT thermal performance (θ_JA = 60°C/W), making it preferred for compact, self-protecting 3.3V/5A rails.

Availability

AZ1084S2-3.3TRE1 is available at Aetrix Electronics and suitable for microprocessor supply, battery charger post-regulation, and industrial embedded controller applications requiring stable component supply and long-term design continuity.

Supply support for AZ1084S2-3.3TRE1 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 AZ1084 series belongs to Diodes' high-current LDO portfolio, engineered specifically for post-regulation and core power delivery in systems demanding low noise, high PSRR, and robust thermal behavior under sustained 5A loads.

FAQ

What is the minimum input voltage required for stable 3.3V output at 5A?

The AZ1084S2-3.3TRE1 requires VIN ≥ 4.6V at 5A load to maintain regulation, based on its 1.3V typical dropout voltage. At worst-case 1.5V dropout (per datasheet limit), VIN must be ≥ 4.8V. Input capacitors ≥10µF ceramic are mandatory for transient stability.

Can the AZ1084S2-3.3TRE1 be used without a heatsink?

Yes, in low-power or intermittent-duty scenarios: at TA = 70°C and no heatsink, maximum continuous power dissipation is ~3W (PD_max = (125°C − 70°C)/60°C/W). For 5A at 3.3V output with VIN = 6V, PD = (6V − 3.3V) × 5A = 13.5W - a heatsink is mandatory.

Is the ADJ/GND pin functional in the fixed 3.3V version?

No - in AZ1084S2-3.3TRE1, pin 3 (ADJ/GND) is internally connected to ground and serves only as a thermal and electrical ground tie point. It must be soldered to a low-impedance PCB ground plane; floating or high-impedance connections degrade regulation accuracy and thermal performance.

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

The AZ1084S2-3.3TRE1 limits output current to 6.5A typical (5.5A min) and enters thermal shutdown if junction temperature exceeds +150°C. During sustained short-circuit, it cycles between current limit and thermal shutdown - not hiccup mode - requiring external fault handling for safe recovery.