Diodes Incorporated AZ1117CD-2.5TRG1

Overview

AZ1117CD-2.5TRG1 from Diodes Incorporated is a fixed-output 2.5V low-dropout linear regulator in TO252-2 (3) package, delivering up to 1.35A output current with ±1% output voltage accuracy, 1.3V typical dropout at 0.8A, and integrated thermal shutdown. It powers USB peripherals and PC motherboard auxiliary rails where stable low-voltage bias and transient response are critical.

For engineers reviewing the AZ1117CD-2.5TRG1 datasheet, AZ1117CD-2.5TRG1 pinout, AZ1117CD-2.5TRG1 application, or AZ1117CD-2.5TRG1 equivalent, key selection criteria include dropout voltage at full load, PSRR at 120Hz, compatibility with ceramic output capacitors ≤20Ω ESR, and thermal resistance (θJC = 10°C/W) for board-level thermal design.

Technical Context

The AZ1117CD-2.5TRG1 uses a trimmed bandgap reference and internal current-limit circuitry to maintain output regulation across input voltages from 3.5V to 15V and junction temperatures from –20°C to +125°C. Its architecture integrates overcurrent protection and thermal shutdown triggered at +160°C with +16°C hysteresis.

It operates with a minimum 10µF ceramic output capacitor (ESR < 20Ω), supports no external feedback components for fixed 2.5V operation, and achieves 70dB PSRR at 120Hz with 3V headroom and 300mA load - enabling clean power delivery in noise-sensitive analog and digital subsystems.

Key Specifications

Pinout & Package

Package: TO252-2 (3), surface-mount, thermally enhanced DPAK variant with exposed drain pad (pin 2) for PCB heat sinking. Pin 1: INPUT; Pin 2: OUTPUT; Pin 3: GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU-2.5 and TLV1117-25CDCY, the AZ1117CD-2.5TRG1 balances 1.35A capability, 1.3V dropout, and TO252 thermal efficiency - making it optimal for mid-power industrial and computing applications where board area and thermal management are jointly constrained.

Availability

AZ1117CD-2.5TRG1 is available at Aetrix Electronics and suitable for USB devices, PC motherboards, and DVD player designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AZ1117CD-2.5TRG1 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 for power management, signal integrity, and connectivity applications.

The AZ1117C series targets cost-sensitive, high-volume power regulation needs in consumer, computing, and industrial systems - emphasizing low dropout, thermal robustness, and compatibility with modern ceramic capacitors.

FAQ

What is the minimum input voltage required for stable 2.5V output?

The AZ1117CD-2.5TRG1 requires a minimum input voltage of 3.8V to maintain regulation at full 1.35A load, based on its 1.3V typical dropout voltage. At lighter loads (e.g., 10mA), input can be as low as 3.5V. Operation below the dropout threshold causes unregulated output collapse.

Can this regulator operate with a 4.7µF ceramic output capacitor?

No. The datasheet mandates a minimum 10µF ceramic output capacitor with ESR < 20Ω for stability. Using 4.7µF risks oscillation or poor transient response, especially under load steps. A 10µF X5R or X7R ceramic placed within 5mm of the device pins is required.

Is the TO252-2 (3) package thermally compatible with standard FR-4 PCBs?

Yes - the TO252-2 (3) package has θJC = 10°C/W and is designed for soldering to a copper thermal pad on FR-4. For continuous 1.35A operation, Diodes recommends a ≥100mm² top-side copper area with ≥8 thermal vias to inner ground planes to maintain junction temperature ≤125°C.

Does the AZ1117CD-2.5TRG1 require an input capacitor?

Yes. A minimum 10µF ceramic input capacitor is recommended within 10mm of the INPUT pin to suppress source impedance and prevent instability during load transients. This capacitor must be rated for ≥16V and placed close to minimize loop inductance.