Diodes Incorporated AZ1117EH-1.8TRG1

Overview

AZ1117EH-1.8TRG1 from Diodes Incorporated is a 1.0A low-dropout linear regulator delivering a fixed 1.8V output with ±1% accuracy, 1.1V typical dropout at full load, and integrated thermal shutdown and current limit protection. It operates over –40°C to +125°C and is optimized for space-constrained, low-voltage applications such as notebook CPU core logic rails and LCD bias supplies.

For engineers reviewing the AZ1117EH-1.8TRG1 datasheet, AZ1117EH-1.8TRG1 pinout, AZ1117EH-1.8TRG1 application, or AZ1117EH-1.8TRG1 equivalent, key selection criteria include dropout voltage at 1A, ±1% output tolerance across temperature, SOT-223 thermal resistance (θ_JA = 65°C/W), PSRR of 70dB at 1kHz, and compatibility with low-ESR ceramic capacitors ≥1.0µF.

Technical Context

The AZ1117EH-1.8TRG1 uses an internal trimmed bandgap reference and PNP pass transistor architecture to achieve stable 1.8V regulation with minimal input–output differential. Its feedback network is fully integrated-no external resistors required-enabling direct replacement in fixed-output power domains.

Thermal shutdown activates at +170°C with +20°C hysteresis, and current limiting is set at 1.3A typical. The device maintains stability with output capacitors having ESR <1.5Ω and requires no minimum load for fixed versions, simplifying design in always-on subsystems.

Key Specifications

Pinout & Package

Supplied in the industry-standard SOT-223 package (6.5mm × 3.5mm × 1.6mm), featuring exposed thermal pad for enhanced heat dissipation. Pin 1 is ADJ/GND, Pin 2 is OUTPUT, Pin 3 is INPUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP1117E18G-13 and MCP1700T-1802E/TT, the AZ1117EH-1.8TRG1 provides superior output accuracy (±1% vs ±2%/±0.5%), higher current capability (1.0A vs 1.0A/0.25A), and integrated safety features-making it the only viable option for robust, high-current 1.8V regulation in industrial and computing applications.

Availability

AZ1117EH-1.8TRG1 is available at Aetrix Electronics and suitable for mobile processor core supply, LCD panel bias rail, and notebook memory interface rail applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AZ1117EH-1.8TRG1 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 for industrial, computing, and consumer markets.

The AZ1117E series belongs to Diodes' precision LDO portfolio, designed specifically for low-voltage, high-current applications where dropout voltage, thermal resilience, and output accuracy are critical-such as CPU core, memory, and display power domains.

FAQ

What is the minimum input voltage required for stable 1.8V output at 1.0A?

The AZ1117EH-1.8TRG1 requires a minimum input voltage of 2.9V to maintain regulation at 1.0A load, based on its 1.1V typical dropout voltage. Input voltage must remain ≥(1.8V + 1.1V) = 2.9V under worst-case conditions; derating to 3.0V is recommended for margin across temperature and process variation.

Can this LDO operate without an output capacitor?

No. The AZ1117EH-1.8TRG1 requires a minimum 1.0µF ceramic output capacitor with ESR <1.5Ω for stability. Omitting it causes oscillation and potential device failure. The capacitor must be placed adjacent to the OUTPUT pin; adding a 0.1µF capacitor in parallel is allowed only if positioned ≥5mm away to avoid destabilizing the control loop.

Does the AZ1117EH-1.8TRG1 require a minimum load current?

No. Unlike adjustable LDOs, the fixed-output AZ1117EH-1.8TRG1 has no minimum load requirement. It maintains regulation from zero load up to 1.0A, making it suitable for always-on circuits and low-power sleep modes without external dummy loads.

How does thermal shutdown behave during sustained overload?

Under sustained overload, the AZ1117EH-1.8TRG1 triggers thermal shutdown at +170°C junction temperature and remains latched off until junction cools by at least 20°C (to ≤+150°C). This hysteresis prevents rapid cycling and allows safe cooldown before automatic recovery, protecting both the IC and downstream circuitry.