Diodes Incorporated AZ1117CR2-3.3TRG1

Overview

AZ1117CR2-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V low-dropout linear regulator in SOT89-3 package, delivering up to 1.35A typical current with ±1% output voltage accuracy, 1.3V typical dropout at 0.8A, and 70dB PSRR at 120Hz. It integrates thermal shutdown and current limiting, and is optimized for USB devices, PC motherboards, and add-on cards requiring stable low-noise 3.3V supply.

For engineers reviewing the AZ1117CR2-3.3TRG1 datasheet, AZ1117CR2-3.3TRG1 pinout, AZ1117CR2-3.3TRG1 application, or AZ1117CR2-3.3TRG1 equivalent, key selection criteria include dropout voltage at 800mA load, RMS output noise (0.003% of VOUT), quiescent current (max 6mA), and compatibility with low-ESR ceramic capacitors (ESR <20Ω).

Technical Context

The AZ1117CR2-3.3TRG1 uses a trimmed bandgap reference for precise 3.3V regulation and features internal current-limit and thermal-shutdown circuitry triggered at +160°C junction temperature with +16°C hysteresis. Its architecture supports fast transient response and stable operation with ≥10µF ceramic output capacitance.

Designed for fixed-voltage operation, it eliminates external feedback resistors-unlike the ADJ variant-and relies on on-die trimming to maintain ±1% output accuracy across -20°C to +125°C junction temperature range. The SOT89-3 package provides θJA = 170°C/W (no heatsink) and θJC = 30°C/W.

Key Specifications

Pinout & Package

Package: SOT89-3 (TO-243AA), surface-mount, 3-pin plastic package with exposed tab for thermal dissipation. Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/TT and TLV1117-33CDCYR, AZ1117CR2-3.3TRG1 delivers higher current (1.35A), tighter accuracy (±1%), and lower noise-making it optimal for medium-power, noise-sensitive 3.3V systems where SOT89-3 thermal performance is acceptable.

Availability

AZ1117CR2-3.3TRG1 is available at Aetrix Electronics and suitable for USB devices, PC add-on cards, and industrial control modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AZ1117CR2-3.3TRG1 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 company specializing in discrete, analog, and mixed-signal solutions, with emphasis on power management, signal integrity, and protection devices.

The AZ1117C series is designed for cost-sensitive, high-volume applications demanding robust low-dropout regulation-including consumer electronics, computing peripherals, and industrial controls-with focus on thermal resilience and ceramic-capacitor compatibility.

FAQ

What is the minimum required output capacitance for stable operation?

The AZ1117CR2-3.3TRG1 requires a minimum 10µF ceramic output capacitor with ESR less than 20Ω. This value is specified in the datasheet's "Typical Applications Circuit" and validated across all operating conditions. Using smaller or higher-ESR capacitors may cause oscillation or poor transient response, especially under dynamic load changes.

Can this device replace the original AZ1117C-3.3 in existing SOT89 layouts?

Yes-AZ1117CR2-3.3TRG1 is a direct replacement for earlier AZ1117C-3.3 variants in SOT89-3 footprints. It shares identical pinout (INPUT/OUTPUT/GND), electrical specifications, and thermal characteristics. The "R2" suffix denotes updated assembly and marking per Diodes' revision control, with no functional change.

Does the device require an input capacitor, and if so, what value?

An input capacitor is recommended but not strictly mandatory for stability. A 10µF ceramic capacitor placed close to the INPUT and GND pins improves PSRR and mitigates input trace inductance effects during load transients. This recommendation appears in the "Typical Applications Circuit" and is validated in the "Line Transient Response" test data.

Is AZ1117CR2-3.3TRG1 qualified for automotive applications?

No-AZ1117CR2-3.3TRG1 is not AEC-Q100 qualified. Diodes offers automotive-grade versions (e.g., AZ1117CQ series) with PPAP documentation, IATF 16949 manufacturing, and extended qualification testing. For automotive use, contact Diodes directly for Q-grade part numbers and change-control documentation.