Diodes Incorporated AZ1117IH-ADJTRG1

Overview

AZ1117IH-ADJTRG1 from Diodes Incorporated is an industrial-grade adjustable low-dropout linear regulator delivering 1.25 V reference voltage, ±1% output accuracy, 1.35 A typical current limit, and 1.2–1.4 V dropout at 0.8 A in SOT223 or TO252-2 packages. It operates across –40°C to +125°C and integrates thermal shutdown and current-limit protection for USB peripherals, PC motherboard auxiliary rails, and embedded power subsystems.

For engineers reviewing the AZ1117IH-ADJTRG1 datasheet, AZ1117IH-ADJTRG1 pinout, AZ1117IH-ADJTRG1 application, or AZ1117IH-ADJTRG1 equivalent, key selection criteria include adjustable output configuration (via external R1/R2), compatibility with low-ESR ceramic capacitors (≤20 Ω), minimum 10 µF output capacitance, and thermal performance in SOT223 (125 °C/W θJA, no heatsink) versus TO252-2 (100 °C/W).

Technical Context

The AZ1117IH-ADJTRG1 uses a trimmed bandgap reference to maintain 1.238–1.262 V reference voltage over –40°C to +125°C, enabling precise output setting via VOUT = VREF × (1 + R2/R1) + IADJ × R2. Its internal current-limit circuit activates at ≥1 A and sustains 1.35 A typical before foldback.

Thermal shutdown triggers at +160°C junction temperature with +16°C hysteresis, and PSRR reaches 70 dB at 120 Hz with 22 µF output capacitor. Dropout voltage remains ≤1.3 V (SOT223) or ≤1.4 V (TO252-2) at 0.8 A load, supporting operation with minimal VIN–VOUT margin.

Key Specifications

Pinout & Package

SOT223 package: 3-pin surface-mount, thermally enhanced with exposed tab (pin 2). Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = ADJ/GND. Requires ≥10 µF low-ESR ceramic output capacitor (ESR < 20 Ω) and proper thermal pad layout per Diodes' recommended footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU and TLV1117-ADJ, the AZ1117IH-ADJTRG1 uniquely balances 1.35 A capability, ±1% accuracy, ultra-low noise, and industrial temperature support in a cost-effective SOT223 package-making it optimal for mid-power embedded and computing applications demanding both precision and ruggedness.

Availability

AZ1117IH-ADJTRG1 is available at Aetrix Electronics and suitable for USB peripheral power, PC motherboard auxiliary rails, and industrial sensor interface applications requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant packaging.

Supply support for AZ1117IH-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, computing, communications, and consumer markets.

The AZ1117I series is part of Diodes' industrial LDO portfolio, designed specifically for high-reliability, extended-temperature applications where precision regulation, thermal robustness, and low noise are critical.

FAQ

What output voltage range can be set with AZ1117IH-ADJTRG1?

The AZ1117IH-ADJTRG1 supports output voltages from 1.25 V to 15 V, determined by the external resistor divider (VOUT = 1.25 V × (1 + R2/R1) + IADJ × R2). Minimum load current is 1.7–5 mA depending on temperature, and output capacitor must be ≥10 µF with ESR < 20 Ω for stability.

Does AZ1117IH-ADJTRG1 require a heatsink in SOT223 package?

No heatsink is required for ≤0.5 A continuous load at TA ≤ 60°C in still air, given its 125 °C/W θJA (no heatsink). At 1.35 A, thermal derating applies: maximum ambient drops to ~40°C without PCB copper pour. Use ≥100 mm² thermal pad with 8×0.5 mm vias to achieve 100 °C/W θJA.

Can AZ1117IH-ADJTRG1 replace fixed-output variants like AZ1117IH-3.3TRG1?

Yes, but only with external resistor network (e.g., R1 = 124 Ω, R2 = 768 Ω for 3.3 V). The ADJ version lacks internal resistors, so direct pin-for-pin replacement requires board redesign. Fixed versions offer tighter initial accuracy (±1%) and simplified layout, while ADJ provides flexibility across multiple voltages.

Is AZ1117IH-ADJTRG1 qualified for automotive applications?

No-AZ1117IH-ADJTRG1 is rated for industrial temperature (–40°C to +125°C) but is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AZ1117I-AU series) with PPAP support, IATF 16949 manufacturing, and additional stress testing; contact Diodes directly for those part numbers.