Diodes Incorporated AZ1117CD-ADJTRG1

Overview

AZ1117CD-ADJTRG1 from Diodes Incorporated is an adjustable low-dropout linear regulator delivering up to 1.35A output current with ±1% reference voltage accuracy (1.25V), 1.3V typical dropout at 0.8A, and 70dB PSRR at 120Hz. It features on-chip thermal shutdown, current limiting, and compatibility with low-ESR ceramic capacitors. Used in USB devices and PC motherboards for stable local voltage regulation.

For engineers reviewing the AZ1117CD-ADJTRG1 datasheet, AZ1117CD-ADJTRG1 pinout, AZ1117CD-ADJTRG1 application, or AZ1117CD-ADJTRG1 equivalent, key selection criteria include dropout voltage at load, thermal resistance in TO252-2 (3), adjust-pin current tolerance, RMS output noise (0.003% of VOUT), and minimum load current requirement (1.7mA).

Technical Context

The AZ1117CD-ADJTRG1 implements a trimmed bandgap reference with internal error amplifier and PNP pass transistor, enabling precise output voltage setting via external R1/R2 resistors per VOUT = VREF × (1 + R2/R1) + IADJ × R2. Its architecture supports fast transient response and stable operation with ≥10µF ceramic output capacitance (ESR < 20Ω).

Thermal protection activates at +160°C junction temperature with +16°C hysteresis; current limit is internally fixed at 1.35A typical. The device operates across –20°C to +125°C junction temperature and accepts input voltages up to 15V (recommended) or 18V (absolute max).

Key Specifications

Pinout & Package

Package: TO252-2 (3) - surface-mount, thermally enhanced DPAK variant with exposed drain pad for PCB heat sinking (θ_JA = 100°C/W without heatsink; 70°C/W with heatsink).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU and LD1117S33TR, the AZ1117CD-ADJTRG1 offers superior PSRR (70dB vs. ≤60dB) and lower noise (0.003% vs. 0.01%), making it optimal for noise-sensitive analog rails, while retaining adjustability and TO252 thermal performance unmatched by SOT-223 alternatives.

Availability

AZ1117CD-ADJTRG1 is available at Aetrix Electronics and suitable for USB devices, PC motherboards, and DVD player designs requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for AZ1117CD-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The AZ1117C series was developed for cost-effective, thermally robust local regulation in consumer and computing platforms where low dropout, precision, and ceramic capacitor compatibility are essential.

FAQ

What is the minimum output capacitor value required for stable operation?

The AZ1117CD-ADJTRG1 requires a minimum 10µF ceramic output capacitor with ESR less than 20Ω. This value ensures phase margin stability across all loads and temperatures. Using smaller values or higher-ESR capacitors may cause oscillation or poor transient response, especially above 500mA load current.

How does the ADJ pin current affect output voltage accuracy?

The ADJ pin draws 60–120µA, which flows through the lower resistor (R2) in the feedback divider. This introduces a systematic offset: V_OUT = V_REF × (1 + R2/R1) + I_ADJ × R2. For ±0.5% total accuracy, R2 should be ≤10kΩ to limit I_ADJ×R2 error to <6mV at V_REF = 1.25V.

Can this regulator operate with an input voltage below 2.7V?

No. The AZ1117CD-ADJTRG1 requires a minimum input voltage of 2.7V to maintain regulation, as specified in the recommended operating conditions. Below this, the internal bandgap reference and error amplifier cannot function correctly, resulting in unregulated or undefined output behavior-even if VIN exceeds V_OUT + dropout.

Is the TO252-2 (3) package lead-free and RoHS compliant?

Yes. The AZ1117CD-ADJTRG1 uses a fully lead-free, RoHS 3-compliant (2015/863/EU) TO252-2 (3) package. Diodes Incorporated certifies zero intentionally added lead, with bromine and chlorine content each below 900ppm and antimony below 1000ppm, meeting "Green" product definitions.