Diodes Incorporated AZ1117CD-3.3TRG1

Overview

AZ1117CD-3.3TRG1 from Diodes Incorporated is a fixed-output 3.3V low-dropout linear regulator in TO252-2 (3) package, delivering up to 1.35A typical output current with ±1% output voltage accuracy, 1.3V typical dropout at 0.8A, and 70dB PSRR at 120Hz. It integrates thermal shutdown and current-limit protection, and is optimized for USB devices and PC motherboard power rails where transient response and minimal input headroom are critical.

For engineers reviewing the AZ1117CD-3.3TRG1 datasheet, AZ1117CD-3.3TRG1 pinout, AZ1117CD-3.3TRG1 application, or AZ1117CD-3.3TRG1 equivalent, key selection criteria include dropout voltage under load, thermal resistance (θJC = 10°C/W), compatibility with low-ESR ceramic capacitors (<20Ω), minimum 10µF output capacitance requirement, and junction temperature range of –20°C to +125°C.

Technical Context

The AZ1117CD-3.3TRG1 uses a trimmed bandgap reference to maintain ±1% output voltage accuracy across –20°C to +125°C. Its internal current-limit circuit activates at 1.35A typical, and thermal shutdown triggers at +160°C with +16°C hysteresis.

It operates with input voltages up to 15V (recommended) and requires only a 10µF ceramic output capacitor with ESR <20Ω. The device achieves 0.003% RMS output noise (10Hz–10kHz) and 70dB ripple rejection at 120Hz with 3V headroom and 300mA load.

Key Specifications

Pinout & Package

Package: TO252-2 (3), surface-mount, thermally enhanced DPAK with exposed drain pad for PCB heat sinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU-3.3 and TLV1117-33CDCYR, the AZ1117CD-3.3TRG1 delivers superior current capability (1.35A) in a thermally efficient TO252-2 package while maintaining ultra-low noise and industry-standard 3.3V accuracy-making it optimal for mid-power industrial and computing applications balancing performance, thermal management, and cost.

Availability

AZ1117CD-3.3TRG1 is available at Aetrix Electronics and suitable for USB devices, PC motherboards, and DVD player power subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AZ1117CD-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 design and manufacturing facilities certified to IATF 16949 and ISO 9001 standards.

The AZ1117C series is part of Diodes' precision linear regulator product line, engineered for low-noise, high-accuracy power delivery in computing, consumer, and industrial applications where reliability and thermal resilience are essential.

FAQ

What is the minimum input voltage required for AZ1117CD-3.3TRG1 to maintain regulation?

The minimum input voltage is determined by dropout voltage plus output voltage: 3.3V + 1.3V = 4.6V typical at 0.8A load. At lighter loads, dropout decreases - e.g., ~1.1V at 100mA - allowing regulation down to ~4.4V. Absolute minimum VIN per datasheet is 1.5V above VOUT (i.e., 4.8V) for guaranteed specification compliance across temperature and process variation.

Can AZ1117CD-3.3TRG1 be used with a 22µF tantalum capacitor instead of ceramic?

Yes, but with caution: the datasheet specifies stability with ESR <20Ω and recommends ceramic capacitors due to their low ESR and wide temperature stability. A 22µF tantalum typically has ESR ~0.5–2Ω, which satisfies the ESR requirement, but its capacitance degrades significantly below –20°C and above +85°C. For industrial temperature range operation, ceramic is strongly preferred for consistent performance.

Does AZ1117CD-3.3TRG1 require an input capacitor, and if so, what value and type?

While not strictly mandatory for stability, a 10µF ceramic input capacitor placed within 10mm of the INPUT and GND pins is recommended to suppress high-frequency noise and prevent oscillation during fast load transients. The capacitor should be X5R/X7R dielectric, rated ≥10V, and placed close to minimize loop inductance - especially critical when sourcing from a switching regulator or long PCB traces.

How does thermal shutdown behave during sustained overload conditions?

When junction temperature reaches +160°C, thermal shutdown disables the pass transistor, halting output current. After shutdown, the device cools until temperature drops by ~16°C (hysteresis), then automatically resumes regulation. During repeated cycling, average output current is limited by thermal mass and PCB heatsinking - e.g., on a 2-layer 100mm² copper pad, sustained current is ~0.9A before entering thermal cycling mode.