Diodes Incorporated AZ1117CD-1.2TRG1

Overview

AZ1117CD-1.2TRG1 from Diodes Incorporated is a fixed-output 1.2 V low-dropout linear regulator in TO252-2 (3) package, delivering up to 1.35 A with ±1.2% output voltage accuracy at 10 mA, 70 dB PSRR at 120 Hz, and thermal shutdown protection. It serves as a primary post-regulation supply for USB peripherals and PC motherboard auxiliary rails where low dropout and stable low-voltage bias are critical.

For engineers reviewing the AZ1117CD-1.2TRG1 datasheet, AZ1117CD-1.2TRG1 pinout, AZ1117CD-1.2TRG1 application, or AZ1117CD-1.2TRG1 equivalent, key selection factors include dropout voltage at 0.8 A (1.3 V typ), compatibility with low-ESR ceramic capacitors (≤20 Ω), minimum 10 µF output capacitance requirement, and junction temperature range of –20°C to +125°C.

Technical Context

The AZ1117CD-1.2TRG1 integrates a trimmed bandgap reference and on-chip current-limit circuitry, enabling ±1.2% initial output accuracy and robust short-circuit protection. Its internal thermal shutdown activates at +160°C with +16°C hysteresis, ensuring safe operation under sustained overload or high ambient conditions.

Designed for low-noise applications, it achieves 0.003% RMS output noise (10 Hz–10 kHz) and maintains 70 dB power supply rejection at 120 Hz with 22 µF output capacitance. The device operates with input voltages up to 15 V and requires no external components for fixed 1.2 V output.

Key Specifications

Pinout & Package

Package: TO252-2 (3), surface-mount, thermally enhanced DPAK variant with exposed drain pad for improved heat dissipation (θJC = 10°C/W). Pin 1: INPUT; Pin 2: OUTPUT; Pin 3: GND (common for fixed-output versions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU-1.2 and TLV70012DCKR, the AZ1117CD-1.2TRG1 delivers optimal balance of current capability (1.35 A), low dropout (1.3 V), and industrial temperature range (–20°C to +125°C) in a thermally robust TO252-2 package - making it the preferred choice for medium-power, noise-sensitive embedded power rails.

Availability

AZ1117CD-1.2TRG1 is available at Aetrix Electronics and suitable for USB devices, add-on cards, and PC motherboard auxiliary power rails requiring stable component supply across industrial temperature grades and long production lifecycles.

Supply support for AZ1117CD-1.2TRG1 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 AZ1117C product line delivers cost-effective, thermally robust LDO regulators optimized for low-voltage post-regulation in space-constrained, high-reliability applications - particularly where dropout, noise, and thermal safety are critical.

FAQ

What is the minimum input voltage required for stable 1.2 V output at 1 A?

The AZ1117CD-1.2TRG1 requires VIN ≥ VOUT + VDROP. At 1 A, typical dropout is 1.4 V (max 1.4 V per datasheet), so minimum input is 2.6 V. Operation below this causes output collapse; derate for temperature - at +125°C, dropout increases by ~10%.

Can the AZ1117CD-1.2TRG1 be used with a 4.7 µF output capacitor?

No. The datasheet mandates a minimum 10 µF output capacitor with ESR < 20 Ω for stability. Using 4.7 µF risks oscillation and output overshoot during load transients. Ceramic capacitors rated 10 µF/6.3 V X5R or X7R in 0805 or 1206 case sizes meet both requirements.

Does the TO252-2 (3) package require soldering the exposed pad to PCB ground?

Yes. The exposed thermal pad (Pin 4, non-electrical) must be soldered to a large copper pour connected to GND. This reduces θJA from 100°C/W (no heatsink) to ~70°C/W (with heatsink), preventing thermal shutdown at full load. Omitting this connection limits continuous current to ~0.6 A at +70°C ambient.

Is the AZ1117CD-1.2TRG1 compliant with AEC-Q100 for automotive use?

No. While rated for –20°C to +125°C junction temperature, the AZ1117CD-1.2TRG1 is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., AZ1117CQ series) with PPAP documentation, IATF 16949 manufacturing, and extended reliability testing - contact Diodes sales for qualified part numbers.