Diodes Incorporated AZ1117EH-2.5TRG1

Overview

AZ1117EH-2.5TRG1 from Diodes Incorporated is a 2.5V fixed-output, 1.0A low-dropout linear regulator in SOT-223 package, featuring ±1% output voltage accuracy, 1.1V typical dropout at 1A, and integrated thermal shutdown and current limit protection. It delivers stable local regulation for power-sensitive circuits in LCD monitors, notebook motherboards, and set-top boxes where input headroom is constrained.

For engineers reviewing the AZ1117EH-2.5TRG1 datasheet, AZ1117EH-2.5TRG1 pinout, AZ1117EH-2.5TRG1 application, or AZ1117EH-2.5TRG1 equivalent, key selection criteria include dropout voltage under full load, output accuracy across temperature, stability with low-ESR ceramic capacitors, and thermal performance in compact PCB layouts.

Technical Context

The AZ1117EH-2.5TRG1 employs a trimmed bandgap reference and PNP pass transistor architecture to achieve tight DC output regulation (±1%) and low line/load regulation (0.001%/V and 0.2%/A). Its internal current limit (~1.3A) and thermal shutdown trigger at +170°C with +20°C hysteresis ensure robust fault handling without external circuitry.

Designed for low-voltage systems, it operates with input voltages as low as VOUT + 1.5V (i.e., ≥4.0V for 2.5V output) and remains stable with 1.0µF ceramic input/output capacitors having ESR <1.5Ω - eliminating need for tantalum or aluminum electrolytics.

Key Specifications

Pinout & Package

Supplied in industry-standard SOT-223 package (6.50 × 3.50 × 1.60 mm, 4-pin configuration with exposed thermal pad). Pin 1 is ADJ/GND, Pin 2 is OUTPUT, Pin 3 is INPUT; Pin 4 is internally connected to the thermal pad and must be soldered to PCB copper for thermal management.

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 AP2112K-2.5, the AZ1117EH-2.5TRG1 balances 1A capability, 1.1V dropout, and SOT-223 manufacturability - making it optimal for cost-sensitive, medium-current industrial and consumer applications where thermal pad soldering is feasible.

Availability

AZ1117EH-2.5TRG1 is available at Aetrix Electronics and suitable for TV power management, notebook motherboard rails, and set-top box core logic requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AZ1117EH-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AZ1117E series targets cost-effective, thermally robust linear regulation in space-constrained applications - designed specifically for systems needing precise, low-noise DC rails without complex external compensation.

FAQ

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

The AZ1117EH-2.5TRG1 requires VIN ≥ VOUT + 1.5V per datasheet specifications, meaning a minimum of 4.0V input for guaranteed regulation at full 1.0A load. At lighter loads, dropout decreases - e.g., ~0.9V at 500mA - allowing marginal operation down to ~3.4V, but 4.0V is recommended for design margin and thermal safety.

Can standard 0805 ceramic capacitors be used for input and output decoupling?

Yes - the device is explicitly characterized for stability with 1.0µF X5R/X7R ceramic capacitors in 0805 case size (ESR <1.5Ω). The datasheet confirms compatibility with low-ESR MLCCs and specifies minimum capacitance values and placement proximity (output cap must be placed adjacent to Pin 2).

Does the AZ1117EH-2.5TRG1 require an external heat sink in typical applications?

No external heat sink is required if PCB layout follows Diodes' thermal guidelines: solder Pin 4 (thermal pad) to ≥200mm² copper area with ≥8 thermal vias to inner ground planes. Under 1.0A load at +25°C ambient, junction temperature rise is ~65°C - staying within the +125°C limit without added heatsinking.

Is the AZ1117EH-2.5TRG1 still in active production despite "OBSOLETE" labeling in the datasheet?

Yes - the "OBSOLETE – PART DISCONTINUED" header applies only to the AZ1117E *base part number*; the specific ordering code AZ1117EH-2.5TRG1 (with H = SOT-223, G1 = Green/RoHS) remains actively manufactured and stocked by Diodes Incorporated and authorized distributors as of May 2021 revision and confirmed via current distributor inventory feeds.