Diodes Incorporated AZ1117CD-1.5TRG1

Overview

AZ1117CD-1.5TRG1 from Diodes Incorporated is a fixed-output 1.5 V low-dropout linear regulator in TO252-2 (3) package, delivering up to 1.35 A with ±1% output voltage accuracy, 1.3 V typical dropout at 0.8 A, and integrated thermal shutdown. It powers USB devices and PC motherboard subsystems requiring stable low-voltage bias under transient load.

For engineers reviewing the AZ1117CD-1.5TRG1 datasheet, AZ1117CD-1.5TRG1 pinout, AZ1117CD-1.5TRG1 application, or AZ1117CD-1.5TRG1 equivalent, key selection criteria include dropout voltage at full load, PSRR at 120 Hz, quiescent current, thermal resistance (θJC = 10°C/W), and compatibility with ceramic output capacitors ≤20 Ω ESR.

Technical Context

The AZ1117CD-1.5TRG1 uses an internal trimmed bandgap reference and PNP pass transistor architecture to maintain regulation across input voltages from 2.7 V to 15 V. Its feedback loop is internally configured for fixed 1.5 V output, eliminating external resistors.

Thermal protection activates at +160°C junction temperature with +16°C hysteresis, and current limiting engages at ≥1 A. The device operates from –20°C to +125°C junction temperature and requires ≥10 µF ceramic output capacitance with ESR < 20 Ω.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU-1.5 and TLV70115DBVR, the AZ1117CD-1.5TRG1 uniquely balances 1.35 A capability, 1.3 V dropout, and TO252 thermal performance-making it optimal for cost-sensitive, medium-power embedded applications needing robust thermal management without over-spec'ing current or IQ.

Availability

AZ1117CD-1.5TRG1 is available at Aetrix Electronics and suitable for USB devices, PC motherboards, DVD players, and add-on cards requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for AZ1117CD-1.5TRG1 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 ICs for power management, signal integrity, and connectivity applications.

The AZ1117C series is designed for high-reliability, low-noise linear regulation in space-constrained consumer and computing systems where dropout voltage, thermal resilience, and output accuracy are critical.

FAQ

What is the minimum input voltage required for stable 1.5 V output at 1.35 A?

The AZ1117CD-1.5TRG1 requires VIN ≥ VOUT + VDROP = 1.5 V + 1.4 V (max) = 2.9 V to maintain regulation at full current. At 0.8 A, typical dropout is 1.3 V, so 2.8 V input suffices. Below 2.7 V, output drops out of specification.

Can the AZ1117CD-1.5TRG1 be used with a 4.7 µF ceramic output capacitor?

No. The datasheet mandates ≥10 µF output capacitance with ESR < 20 Ω for stability. A 4.7 µF capacitor violates the minimum value requirement and risks oscillation or poor transient response, especially under load steps.

Does this part support reverse-voltage protection?

No. The AZ1117CD-1.5TRG1 lacks built-in reverse-polarity protection. Applying negative voltage to INPUT or OUTPUT relative to GND may cause latch-up or permanent damage. An external series diode or MOSFET is required for reverse-input protection.

Is the TO252-2 (3) package thermally compatible with standard FR-4 PCBs without a heatsink?

Yes-when soldered to ≥100 mm² of 2 oz. copper on top layer with 8×0.5 mm vias to inner ground planes, θJA drops to 70°C/W. This allows ~1.1 W dissipation at +70°C ambient before reaching +125°C junction limit, sufficient for 1.35 A at 1.3 V dropout (1.76 W max) only with adequate copper area.