Diodes Incorporated AZ1117H-1.5TRE1

Overview

AZ1117H-1.5TRE1 from Diodes Incorporated is a fixed-output 1.5V, 1A low-dropout linear regulator in SOT223 package, delivering ±1% output voltage accuracy at 25°C, 1.15V dropout at full load, and integrated thermal shutdown and current limiting. It powers core logic rails in PC motherboards, LCD monitors, and peripheral equipment where stable low-voltage biasing is required.

For engineers reviewing the AZ1117H-1.5TRE1 datasheet, AZ1117H-1.5TRE1 pinout, AZ1117H-1.5TRE1 application, or AZ1117H-1.5TRE1 equivalent, key selection criteria include dropout voltage at 1A, output accuracy over temperature, thermal resistance (θ_JA = 120°C/W), and compatibility with 10µF–22µF ceramic or tantalum output capacitors.

Technical Context

The AZ1117H-1.5TRE1 uses a trimmed bandgap reference and PNP pass transistor architecture to maintain regulation under varying line and load conditions. Its internal current limit is factory-trimmed to 1.25–1.35A, and thermal shutdown activates at +150°C with +25°C hysteresis.

It operates across –40°C to +125°C junction temperature, supports input voltages up to 15V, and achieves 60–75dB ripple rejection at 120Hz with 22µF tantalum output capacitance. No external compensation is required for stability with standard output capacitor types.

Key Specifications

Pinout & Package

SOT223-3 package: surface-mount, thermally enhanced plastic case with exposed thermal pad (pin 2 is tab-connected to GND in standard configuration). Pin 1 = OUTPUT, Pin 2 = GND, Pin 3 = INPUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU-1.5 and LD1117S15TR, the AZ1117H-1.5TRE1 offers superior output accuracy (±1% vs ±2%) and lower thermal resistance (120°C/W vs 150°C/W), making it optimal for space-constrained, precision-bias applications where 1.5V stability directly impacts signal integrity.

Availability

AZ1117H-1.5TRE1 is available at Aetrix Electronics and suitable for PC motherboard power delivery, LCD monitor logic rails, and printer engine controllers requiring stable component supply with RoHS 3 compliance and industrial temperature support.

Supply support for AZ1117H-1.5TRE1 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 devices, with design centers across Asia, Europe, and the US, serving industrial, computing, and consumer markets.

The AZ1117 series targets cost-effective, thermally robust linear regulation for legacy and mainstream embedded systems-designed for plug-and-play replacement of older 78xx-style regulators while supporting modern low-voltage logic families.

FAQ

What is the minimum input voltage required for stable 1.5V output at 1A?

The AZ1117H-1.5TRE1 requires VIN ≥ VOUT + VDROP = 1.5V + 1.15V = 2.65V to maintain regulation at full load. For reliable operation with margin, Diodes recommends VIN ≥ 3.0V across temperature and line variations. Below this, output voltage sags and regulation is lost.

Can ceramic capacitors be used instead of tantalum for output filtering?

Yes-10µF–22µF X5R/X7R ceramic capacitors are fully compatible and recommended for improved reliability and lower ESR. The device is stable with ESR as low as 0.01Ω; no series resistor is needed. Avoid NP0/C0G below 1µF due to insufficient capacitance.

Is the SOT223 package lead (Pin 2) electrically connected to GND?

Yes-on the AZ1117H-1.5TRE1 in SOT223, Pin 2 is the exposed thermal tab and is internally bonded to GND. It must be soldered to a PCB ground plane for both electrical reference and thermal dissipation; floating the tab degrades θ_JA by >40°C/W.

Does this part support reverse-polarity input protection?

No-the AZ1117H-1.5TRE1 lacks internal reverse-voltage protection. Applying negative voltage to Pin 3 (INPUT) or reverse-biasing the output relative to input can cause latch-up or permanent damage. An external series diode or dedicated protection IC is required for such conditions.