Diodes Incorporated AZ1117S-ADJTRE1

Overview

AZ1117S-ADJTRE1 from Diodes Incorporated is an adjustable 1A low-dropout linear regulator with 1.15V dropout at full load, ±1% reference voltage accuracy (1.25V), and integrated thermal shutdown and current limiting. It operates from −40°C to +125°C and delivers stable output voltages from 1.25V to 12V using two external resistors-commonly deployed in PC motherboard power rails and LCD monitor bias supplies.

For engineers reviewing the AZ1117S-ADJTRE1 datasheet, AZ1117S-ADJTRE1 pinout, AZ1117S-ADJTRE1 application, or AZ1117S-ADJTRE1 equivalent, key selection criteria include dropout performance at 1A, adjustable output flexibility, thermal shutdown hysteresis (+25°C), SOT-223 package thermal resistance (θ_JA = 120°C/W), and compliance with RoHS 3 (2015/863/EU).

Technical Context

The AZ1117S-ADJTRE1 uses a trimmed bandgap reference to maintain 1.225V–1.270V V_REF across temperature and load, enabling precise output setting via R1/R2 feedback. Its internal current limit is factory-trimmed to 1.25A–1.35A, ensuring consistent short-circuit protection without external components.

Thermal shutdown activates at +150°C junction temperature with +25°C hysteresis, and the device sustains operation up to 125°C ambient when properly heatsinked. Dropout voltage remains ≤1.25V across 0.1A–1.0A output current and input-to-output differentials ≥1.4V.

Key Specifications

Pinout & Package

SOT-223 package: surface-mount, thermally enhanced 4-pin variant with exposed thermal pad (pin 4). Pin 1 = OUTPUT, Pin 2 = INPUT, Pin 3 = ADJUST, Pin 4 = GND/thermal tab.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU and LD1117S33TR, the AZ1117S-ADJTRE1 uniquely balances adjustability, SOT-223 compactness, and 1A capability - making it optimal for multi-voltage consumer electronics where layout area and design reuse are prioritized over ultra-low quiescent current or extreme input voltage range.

Availability

AZ1117S-ADJTRE1 is available at Aetrix Electronics and suitable for PC motherboard power delivery, LCD monitor bias generation, and telecom line card control-plane supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AZ1117S-ADJTRE1 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 AZ1117 series belongs to Diodes' precision linear regulator product line, engineered for cost-effective, thermally robust DC-DC regulation in computing, display, and communications infrastructure where reliability and manufacturability are critical.

FAQ

What is the minimum load current required for stable operation of AZ1117S-ADJTRE1?

The AZ1117S-ADJTRE1 requires a minimum load current of 1.7mA to 5mA (depending on junction temperature) to maintain regulation in adjustable mode. This is specified in the Electrical Characteristics table for the ADJ version under "Minimum Load Current (ADJ)" and arises from internal biasing requirements of the bandgap reference and error amplifier.

Can AZ1117S-ADJTRE1 be used with ceramic output capacitors?

Yes - the AZ1117S-ADJTRE1 is stable with ceramic output capacitors ≥10µF, provided ESR is ≥15mΩ. The datasheet confirms compatibility with tantalum and ceramic types; however, ultra-low-ESR ceramics (<5mΩ) may require a small series resistor (≈100mΩ) to ensure phase margin.

How does thermal shutdown hysteresis affect system recovery after overload?

Thermal shutdown triggers at +150°C junction temperature and resets at +125°C due to +25°C hysteresis. This prevents oscillatory cycling during sustained overload, allowing the die to cool sufficiently before resuming regulation - critical for protecting downstream logic in unattended equipment.

Is AZ1117S-ADJTRE1 pin-compatible with older AZ1117 versions like AZ1117H-ADJTRE1?

No - AZ1117S-ADJTRE1 uses the SOT-223 package with pin 4 as GND/thermal tab, whereas AZ1117H-ADJTRE1 is also SOT-223 but marked with different suffixes indicating identical pinout; however, "S" denotes Diodes' standard SOT-223 variant (same mechanical footprint and pin assignment), so PCB layout is compatible across H/S/D/T variants of the same voltage option.