Diodes Incorporated AZ1084D-3.3TRG1

Overview

AZ1084D-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V, 5A low dropout linear regulator in TO-252-2 (3) package with 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 microprocessor supply in desktop PCs and embedded systems requiring high-current, low-noise post-regulation after switching converters.

For engineers reviewing the AZ1084D-3.3TRG1 datasheet, AZ1084D-3.3TRG1 pinout, AZ1084D-3.3TRG1 application, or AZ1084D-3.3TRG1 equivalent, key selection criteria include dropout voltage at 5A, thermal resistance (θ_JA = 100°C/W), load regulation (≤15 mV), and compatibility with standard PCB pad layouts for TO-252-2 (3) packages.

Technical Context

The AZ1084D-3.3TRG1 implements a trimmed band-gap reference with internal current limiting and thermal shutdown circuitry. Its architecture supports stable operation with input voltages as low as 4.8V (for 3.3V output) and maintains regulation across 10mA–5A load range.

It features fixed 3.3V output with no external resistors required, achieves 72dB PSRR at 120Hz, and exhibits 0.003% RMS output noise (10Hz–10kHz). The device operates within 0°C to +125°C junction temperature range and shuts down above +150°C.

Key Specifications

Pinout & Package

Package: TO-252-2 (3), surface-mount, lead-free, RoHS-compliant, with exposed thermal pad (pin 2 = OUTPUT/TAB).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1084K-3.3TSG-13, AZ1084D-3.3TRG1 offers superior PCB area efficiency and reflow compatibility but requires careful thermal pad layout; versus TLV1117-33CDCYR, it delivers 6.25× higher current in a physically larger but thermally optimized package.

Availability

AZ1084D-3.3TRG1 is available at Aetrix Electronics and suitable for desktop PC power delivery, embedded microprocessor supply, and post-regulation for switching supplies requiring stable component supply and long-term BOM continuity.

Supply support for AZ1084D-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-reliability power management, signal integrity, and protection solutions.

AZ1084D-3.3TRG1 belongs to the AZ1084 series of high-current LDO regulators designed specifically for demanding linear regulation tasks in computing, industrial, and communications infrastructure where thermal robustness and output precision are critical.

FAQ

Is AZ1084D-3.3TRG1 still in active production?

No - Diodes Incorporated has marked AZ1084 as obsolete and recommends AZ1084C as the replacement series. AZ1084D-3.3TRG1 remains available through authorized distributors for legacy program support, but new designs should use AZ1084C-3.3TRG1, which shares identical electrical specs and pinout while improving ESD robustness (HBM 3000V vs. 2000V) and thermal performance.

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

The minimum input voltage is 4.8V, per the Recommended Operating Conditions table. At 5A load and 25°C, the 1.3V typical dropout means VIN must exceed 4.6V; however, the datasheet specifies 4.8V minimum to guarantee regulation across full temperature and tolerance ranges, including worst-case 1.5V dropout and ±1% V_OUT tolerance.

Can AZ1084D-3.3TRG1 be used without an input capacitor?

No - the datasheet mandates a minimum 10µF input capacitor (tantalum or ceramic) placed within 10mm of the INPUT and GND pins. Omitting it risks instability, input voltage overshoot during hot-swap events, and failure to meet PSRR and transient response specifications. For optimal performance, use 22µF with ≤50mΩ ESR.

How does the thermal pad (Pin 2) connect electrically and thermally?

Pin 2 is the OUTPUT node and the exposed thermal tab - it is electrically tied to the regulated 3.3V output and must be soldered to a dedicated PCB copper pour for thermal dissipation. The pad layout must follow Diodes' recommended dimensions (11.6 × 7.0 mm) with ≥4 thermal vias (0.3mm diameter, filled or plated) connecting to inner-layer ground or power planes to achieve θ_JA ≤ 100°C/W.