Diodes Incorporated AZ1117ID-ADJTRG1

Overview

AZ1117ID-ADJTRG1 from Diodes Incorporated is an adjustable low-dropout linear regulator optimized for industrial-grade power management in space-constrained systems requiring stable 1.25 V reference accuracy (±1%), 1.35 A current limit, and operation from –40°C to +125°C. It delivers regulated output voltage via two external resistors, supports ceramic capacitors down to 10 µF with ESR <20 Ω, and integrates thermal shutdown and current-limit protection.

For engineers reviewing the AZ1117ID-ADJTRG1 datasheet, AZ1117ID-ADJTRG1 pinout, AZ1117ID-ADJTRG1 application, or AZ1117ID-ADJTRG1 equivalent, key selection criteria include dropout voltage (1.3 V typ at 0.8 A in TO252-2), PSRR (70 dB at 120 Hz), RMS output noise (0.003% of VOUT), and compatibility with low-ESR ceramic output capacitors.

Technical Context

The AZ1117ID-ADJTRG1 implements a trimmed bandgap reference and error amplifier architecture to maintain ±1% output voltage accuracy across temperature and load. Its internal current-limit circuit triggers at 1.35 A typical, while thermal shutdown activates at +160°C junction temperature with +16°C hysteresis.

Designed for minimal input-to-output differential, it achieves 1.3 V typical dropout at 0.8 A in the TO252-2 package and supports transient response optimization via external resistor divider on the ADJ pin. The device operates with input voltages up to 15 V and requires no minimum load beyond 1.7 mA.

Key Specifications

Pinout & Package

Package: TO252-2 (Type CJ), surface-mount, thermally enhanced with exposed drain pad for improved heat dissipation. Thermal resistance θJA is 100 °C/W (no heatsink) and 70 °C/W (with heatsink).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3302E/MB and TLV1117-ADJ, the AZ1117ID-ADJTRG1 offers superior current capability (1.35 A), tighter reference accuracy (±1% vs. ±2%), lower dropout (1.3 V vs. ~1.2 V but with higher current), and broader industrial temperature support (–40°C to +125°C vs. –40°C to +125°C for TLV1117, but only –40°C to +85°C for MCP1703).

Availability

AZ1117ID-ADJTRG1 is available at Aetrix Electronics and suitable for industrial sensor nodes, PC add-in cards, USB peripheral power, and optical drive logic requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AZ1117ID-ADJTRG1 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 AZ1117I series targets industrial-grade linear regulation where precision, thermal robustness, and ceramic capacitor compatibility are essential - particularly in systems lacking dedicated heatsinking or operating in wide ambient temperature swings.

FAQ

What is the minimum output capacitor value required for stability?

The AZ1117ID-ADJTRG1 requires a minimum 10 µF ceramic output capacitor with ESR less than 20 Ω. This value ensures phase margin and transient stability across the full load range (1.7 mA to 1.35 A) and temperature range (–40°C to +125°C). Larger values improve ripple suppression but do not affect basic stability.

Can this part replace fixed-output variants like AZ1117ID-3.3TRG1?

Yes, but only with external resistor configuration: R1 = 124 Ω and R2 = 768 Ω set VOUT ≈ 3.3 V per VOUT = 1.25 V × (1 + R2/R1) + IADJ × R2. Unlike fixed versions, the ADJ variant requires these resistors and has slightly higher quiescent current due to ADJ pin bias (60–120 µA), which must be factored into low-power designs.

What thermal performance can be expected in TO252-2 without a heatsink?

In TO252-2 without a heatsink, θJA is 100 °C/W. At 1 A output and 3 V dropout (3 W dissipation), junction temperature rise is 300°C above ambient - exceeding the +125°C maximum. Derating is mandatory: maximum continuous current is ~0.9 A at +25°C ambient or ~0.5 A at +70°C ambient, assuming PCB copper area per datasheet layout guidelines.

Is the ADJ pin internally connected to ground in fixed-output versions?

No. In fixed-output versions (e.g., AZ1117ID-3.3TRG1), the ADJ/GND pin is internally connected to the output reference node - not ground - and functions as the feedback point. In the ADJ version, it is a high-impedance input for external resistor divider bias; connecting it directly to ground disables regulation and may damage the device.