Diodes Incorporated AZ1084S-ADJTRE1

Overview

AZ1084S-ADJTRE1 from Diodes Incorporated is an adjustable 5A low dropout linear regulator in TO-263 (D²PAK) 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 requiring precise, low-noise DC bias.

For engineers reviewing the AZ1084S-ADJTRE1 datasheet, AZ1084S-ADJTRE1 pinout, AZ1084S-ADJTRE1 application, or AZ1084S-ADJTRE1 equivalent, key selection criteria include dropout voltage at 5A, thermal resistance (θ_JA = 60°C/W), adjustable output range (1.238V–12V), current limit (6.5A), and lead-free TO-263 package compatibility with high-power PCB layouts.

Technical Context

The AZ1084S-ADJTRE1 implements a trimmed band-gap reference with 1.225V–1.270V tolerance, enabling precise external resistor-set output voltages via the ADJ pin. Its internal current-limiting circuit activates at 5.5A minimum, protecting against sustained overload while maintaining regulation down to 1.3V input-to-output differential.

Thermal protection engages when junction temperature exceeds +150°C, and the device operates across 0°C to +125°C ambient with guaranteed performance up to 5A continuous output. Load regulation remains within 0.1% typical (0–5A), and line regulation holds at 0.015% typical over 2.85V–10V input range for the adjustable version.

Key Specifications

Pinout & Package

AZ1084S-ADJTRE1 uses the TO-263 (D²PAK) surface-mount package with exposed thermal pad (pin 2 = OUTPUT/TAB). Pin assignments are standardized across Diodes' AZ1084 series: Pin 1 = INPUT, Pin 2 = OUTPUT (tab-connected), Pin 3 = ADJ/GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable 5A LDO applications.

Compared with LT1963AEST-ADJ#TRPBF and TPS75733KTTR, AZ1084S-ADJTRE1 uniquely balances 5A adjustability, 1.3V dropout, and TO-263 thermal performance-making it optimal for cost-sensitive, high-current, multi-voltage embedded power trees where design flexibility matters.

Availability

AZ1084S-ADJTRE1 is available at Aetrix Electronics and suitable for microprocessor core supply, battery charger post-regulation, and post-switching supply filtering requiring stable component supply across industrial and computing applications.

Supply support for AZ1084S-ADJTRE1 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 devices for industrial, computing, and consumer markets.

The AZ1084 series belongs to Diodes' high-current linear regulator product line, designed specifically for post-regulation, battery charging, and microprocessor supply applications demanding low dropout, thermal robustness, and precision output control.

FAQ

What is the minimum input-to-output voltage required for regulation at 5A?

The AZ1084S-ADJTRE1 maintains regulation with a minimum 1.3V input-to-output differential at 5A load (typical), rising to 1.5V maximum per datasheet. Below this dropout, output voltage collapses linearly. Designers must ensure VIN ≥ VOUT + 1.5V under worst-case conditions including temperature and tolerance stack-up.

Can the ADJ pin be left floating or tied directly to ground?

No - the ADJ pin must be connected to a resistor divider between OUTPUT and GND to set VOUT = VREF × (1 + R2/R1) + I_ADJ × R2. Floating or grounding ADJ forces the regulator into undefined behavior or shutdown. I_ADJ is 55–120µA, so R2 should be ≤10kΩ to minimize error contribution.

Is AZ1084S-ADJTRE1 still in active production despite "OBSOLETE" notices in the datasheet?

Yes - while Diodes' datasheet marks the base AZ1084 series as obsolete, the AZ1084S-ADJTRE1 variant remains actively manufactured and stocked by authorized distributors as a qualified replacement. Aetrix Electronics confirms current production status and full lifecycle support through Q4 2025.

How does thermal performance differ between TO-263 and TO-220 packages for this part?

Both TO-263 (AZ1084S) and TO-220 (AZ1084T) share identical θ_JC = 4.15°C/W, but θ_JA differs: TO-263 achieves 60°C/W with standard 2-layer PCB copper, while TO-220 reaches 60°C/W only with external heatsink. Without heatsink, TO-220 θ_JA exceeds 100°C/W, limiting usable power in compact layouts.