Diodes Incorporated AZ1084CD-3.3TRG1

Overview

AZ1084CD-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V, 5A low-dropout linear regulator in TO252-2 (3)/(4)/(5) or TO252 (Type CJ) package, featuring 1.35V typical dropout at full load, on-chip thermal limiting, and ±1% output voltage accuracy over 0°C to +125°C. It delivers stable post-regulation for switching supplies and powers microprocessor cores in embedded systems requiring high-current, low-noise DC rails.

For engineers reviewing the AZ1084CD-3.3TRG1 datasheet, AZ1084CD-3.3TRG1 pinout, AZ1084CD-3.3TRG1 application, or AZ1084CD-3.3TRG1 equivalent, key selection criteria include dropout voltage at 5A, thermal shutdown behavior, compatibility with ceramic output capacitors, and fixed 3.3V output tolerance under varying line/load conditions.

Technical Context

The AZ1084CD-3.3TRG1 uses a trimmed bandgap reference and internal current-limiting circuit to maintain regulation across 4.8V–8V input range. Its thermal protection activates when junction temperature exceeds +150°C, and it supports stable operation with ≥10µF low-ESR ceramic output capacitance.

Designed for high-current linear regulation, it achieves 0.5mV typical load regulation (3–20mV max) and 0.5mV typical line regulation (up to 6mV max) at 3.3V output, enabling precise voltage delivery in noise-sensitive analog and digital subsystems.

Key Specifications

Pinout & Package

Package: TO252-2 (3), TO252-2 (4), TO252-2 (5), or TO252 (Type CJ) - surface-mount, thermally enhanced DPAK variant with exposed drain pad for PCB heat sinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3.3V, 5A LDO applications.

Compared with APL5324QBI-33 and MIC29501-3.3WU, the AZ1084CD-3.3TRG1 provides superior thermal safety margin, tighter output accuracy, and lower dropout-making it optimal for space-constrained industrial and computing applications where reliability under overload is critical.

Availability

AZ1084CD-3.3TRG1 is available at Aetrix Electronics and suitable for microprocessor core supplies, battery charger post-regulators, and industrial PLC I/O modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AZ1084CD-3.3TRG1 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-performance power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AZ1084C series belongs to Diodes' high-current LDO product line, engineered specifically for post-regulation in power-dense systems where thermal robustness, low dropout, and ceramic capacitor compatibility are essential design requirements.

FAQ

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

The AZ1084CD-3.3TRG1 requires a minimum input voltage of 4.65V (3.3V + 1.35V dropout) to maintain regulation at full 5A load. The datasheet specifies 4.8V as the recommended minimum for guaranteed performance across temperature and process variation, with absolute maximum input at 13.2V.

Can this device be used with ceramic output capacitors?

Yes-the AZ1084CD-3.3TRG1 is explicitly designed for stability with low-ESR ceramic capacitors ≥10µF. Unlike older LDOs requiring tantalum or aluminum electrolytic types, its internal compensation ensures phase margin remains adequate with ceramic caps, reducing board area and improving transient response.

Does the ADJ/GND pin require external components in the fixed 3.3V version?

No-the ADJ/GND pin is internally connected to ground in the AZ1084CD-3.3TRG1 fixed-output variant. It serves solely as the reference return path and thermal sensor node; no external resistors or capacitors are needed, simplifying layout and eliminating adjustment error sources.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches +150°C, the AZ1084CD-3.3TRG1 enters thermal shutdown, disabling output until die temperature falls below +135°C (typical hysteresis). This cycle repeats autonomously, preventing permanent damage while allowing safe recovery-no external reset or power cycling is required.