Diodes Incorporated AZ1084CS2-3.3TRG1

Overview

AZ1084CS2-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V, 5A low-dropout linear regulator in TO252-2 (3) package with 1.35V 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 high-current, low-noise DC rails.

For engineers reviewing the AZ1084CS2-3.3TRG1 datasheet, AZ1084CS2-3.3TRG1 pinout, AZ1084CS2-3.3TRG1 application, or AZ1084CS2-3.3TRG1 equivalent, key selection criteria include dropout voltage at 5A, thermal shutdown behavior under sustained load, compatibility with ceramic output capacitors, and GND-referenced fixed-output configuration without external resistors.

Technical Context

The AZ1084CS2-3.3TRG1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling stable regulation with minimal headroom. Its internal current limit of 6.5A and thermal foldback protect against short-circuit and overload conditions across the full 0°C to +125°C operating range.

It features 0.5% reference voltage stability over temperature and supports low-ESR ceramic capacitors (≥10µF input, ≥22µF output) for fast transient response. Line regulation is 0.5mV typical at 10mA, and load regulation remains within ±7mV from 0 to 5A at V_IN–V_OUT = 3V.

Key Specifications

Pinout & Package

Package: TO252-2 (3), surface-mount, single-gate thermally enhanced DPAK variant with exposed drain pad (pin 2) for PCB heat transfer. Dimensions: 6.7mm × 10.4mm × 2.38mm (L × W × H), 0.312g mass, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2112K-3.3TRG1 and TLV1117-33CDCYR, the AZ1084CS2-3.3TRG1 uniquely delivers 5A continuous current with sub-1.4V dropout in a thermally optimized DPAK, making it irreplaceable in high-power linear regulation where both current capability and thermal management are design-critical.

Availability

AZ1084CS2-3.3TRG1 is available at Aetrix Electronics and suitable for microprocessor core supplies, battery charger post-regulation, and desktop PC standby rails requiring stable component supply, long-term lifecycle assurance, and RoHS 3-compliant sourcing.

Supply support for AZ1084CS2-3.3TRG1 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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AZ1084C series belongs to Diodes' high-current LDO portfolio, designed specifically for post-regulation and high-efficiency linear conversion in space-constrained, thermally demanding embedded systems.

FAQ

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

The AZ1084CS2-3.3TRG1 requires a minimum input voltage of 4.65V to maintain regulation at 5A, based on its 1.35V typical dropout voltage. At 4.5V input, output drops below 3.3V under full load; operation below 4.65V risks thermal shutdown due to excessive power dissipation in the pass transistor.

Can this device be used with ceramic output capacitors, and what value is recommended?

Yes - the AZ1084CS2-3.3TRG1 is fully stable with low-ESR ceramic capacitors. Diodes specifies a minimum 22µF X5R/X7R ceramic capacitor on the output, placed within 5mm of pins 2 and 3. A 22µF/16V part with ≤10mΩ ESR meets all stability and transient requirements per DS36545 Rev. 5-2.

Does the GND pin require a dedicated ground plane connection, or can it share with other signals?

The GND pin (pin 3) must connect to a low-impedance, dedicated ground plane region adjacent to the OUTPUT pad (pin 2). Sharing with noisy digital or power grounds introduces instability and degrades PSRR; Diodes recommends a separate 5mm² ground pour tied to system ground at a single point near the regulator's thermal pad.

Is thermal derating required when mounting on a standard 2-layer FR-4 PCB?

Yes - on a 2-layer 1oz FR-4 board with no internal copper planes, θ_JA rises to ~65°C/W. At 5A and 4.65V input, power dissipation is ~5.7W, resulting in ~370°C rise above ambient - exceeding the +150°C absolute max. A 2in² 2oz copper pour under the exposed pad reduces θ_JA to ~45°C/W, enabling full 5A operation at +70°C ambient.