Diodes Incorporated AZ1117CH-3.3TRG1

Overview

AZ1117CH-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V low-dropout linear regulator with ±1% output voltage accuracy, 1.35A typical current limit, and thermal shutdown protection. It operates across -20°C to +125°C junction temperature and supports stable USB device power rails using low-ESR ceramic capacitors.

For engineers reviewing the AZ1117CH-3.3TRG1 datasheet, AZ1117CH-3.3TRG1 pinout, AZ1117CH-3.3TRG1 application, or AZ1117CH-3.3TRG1 equivalent, key selection criteria include dropout voltage (1.3V typ at 0.8A), PSRR (70dB at 120Hz), RMS output noise (0.003% of VOUT), quiescent current (≤6mA), and compatibility with SOT223 package thermal performance (θJC = 15°C/W).

Technical Context

The AZ1117CH-3.3TRG1 integrates a trimmed bandgap reference for ±1% output accuracy and on-chip thermal shutdown triggered at +160°C with +16°C hysteresis. Its architecture uses internal current limiting (1.35A typ) and dropout optimization for low-voltage operation where input margin is constrained.

Designed for fixed-output use, it eliminates external resistors-unlike the ADJ variant-and requires only a 10µF minimum output capacitor with ESR <20Ω. The device maintains regulation under load transients up to 800mA while delivering 70dB ripple rejection at 120Hz with 22µF output capacitance.

Key Specifications

Pinout & Package

The AZ1117CH-3.3TRG1 is packaged in SOT223 (H package), a surface-mount 4-pin thermally enhanced outline with exposed thermal pad. Pin 1 is INPUT, Pin 2 is OUTPUT, Pin 3 is GND, and Pin 4 is the exposed thermal tab (electrically connected to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and TLV1117-33CDCYR, the AZ1117CH-3.3TRG1 delivers superior current capacity (1.35A vs. 250mA/800mA), tighter output accuracy (±1% vs. unspecified/±2%), and proven thermal resilience in SOT223-making it optimal for USB host ports and PC motherboard auxiliary rails requiring sustained 1A delivery.

Availability

AZ1117CH-3.3TRG1 is available at Aetrix Electronics and suitable for USB devices, add-on cards, and PC motherboards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AZ1117CH-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for industrial, computing, consumer, and automotive markets.

The AZ1117C series targets cost-sensitive, high-volume power management applications demanding low dropout, thermal robustness, and compatibility with ceramic output capacitors-particularly in USB, storage, and motherboard subsystems.

FAQ

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

The AZ1117CH-3.3TRG1 requires VIN ≥ VOUT + VDROP. With a typical dropout of 1.3V at 0.8A, the minimum functional input is 4.6V. At lighter loads (e.g., 10mA), dropout drops to ~1.2V, allowing operation down to ~4.5V while maintaining ±1% regulation across -20°C to +125°C.

Can this regulator be used with a 10µF X5R ceramic capacitor?

Yes-the AZ1117CH-3.3TRG1 is explicitly designed for low-ESR ceramic capacitors. A 10µF X5R capacitor (ESR <20Ω) meets the stability requirement. Avoid high-ESR types like standard aluminum electrolytics; X5R/X7R ceramics ensure phase margin and transient response remain within spec.

Does the SOT223 package require a heatsink for 1A continuous operation?

No external heatsink is required. With θJC = 15°C/W and θJA = 125°C/W (no heatsink), power dissipation at 1A with 1.5V input-to-output differential is 1.5W. Junction temperature rise is ~188°C above ambient-exceeding safe limits. However, proper PCB copper area (≥100mm² GND pour connected to Pin 4) reduces effective θJA to ~60°C/W, enabling 1A continuous operation at +70°C ambient.

Is the AZ1117CH-3.3TRG1 qualified for automotive applications?

No-the AZ1117CH-3.3TRG1 is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., AZ1117CH-3.3TRG1-AU) with PPAP documentation, IATF 16949 manufacturing, and extended temperature screening. For non-automotive industrial or computing use, this part meets full industrial (-20°C to +125°C) specifications and RoHS compliance.