Diodes Incorporated AZ1117IH-2.5TRG1

Overview

AZ1117IH-2.5TRG1 from Diodes Incorporated is a fixed-output 2.5 V low-dropout linear regulator in SOT223 package, delivering up to 1.35 A with ±1% output voltage accuracy, 1.2–1.3 V dropout at 0.8 A, and integrated thermal shutdown. It serves as a primary post-regulation stage in USB-powered peripherals and PC motherboard auxiliary rails where stable low-voltage supply and transient response are critical.

For engineers reviewing the AZ1117IH-2.5TRG1 datasheet, AZ1117IH-2.5TRG1 pinout, AZ1117IH-2.5TRG1 application, or AZ1117IH-2.5TRG1 equivalent, key selection criteria include dropout voltage at full load, PSRR at 120 Hz (70 dB), RMS output noise (0.003% of VOUT), quiescent current (max 6 mA), and compatibility with low-ESR ceramic capacitors (≤20 Ω, ≥10 µF).

Technical Context

The AZ1117IH-2.5TRG1 employs a trimmed bandgap reference and internal current-limiting circuitry to maintain output regulation across -40°C to +125°C junction temperature. Its architecture integrates protection features including thermal shutdown activation at +160°C with +16°C hysteresis and foldback current limiting.

Designed for industrial-grade reliability, it operates with input voltages up to 15 V and requires no external components for fixed 2.5 V output. The device supports stable operation with ceramic output capacitors as low as 10 µF and ESR under 20 Ω, eliminating need for tantalum or electrolytic alternatives.

Key Specifications

Pinout & Package

SOT223 package: 3-pin surface-mount, thermally enhanced plastic case with exposed tab (pin 2 connected to output and tab). Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP2112K-2.5TRG1 and MCP1700T-2502E/MB, the AZ1117IH-2.5TRG1 uniquely balances 1.35 A capability, ±1% accuracy, and industrial thermal resilience in a cost-effective SOT223 package - making it the preferred choice for mains-powered embedded systems requiring sustained high-current regulation.

Availability

AZ1117IH-2.5TRG1 is available at Aetrix Electronics and suitable for USB devices, PC motherboards, and DVD players requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for AZ1117IH-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions, with ISO 9001 and IATF 16949 certified facilities and broad distribution through authorized channels.

The AZ1117I series was developed for industrial and computing applications demanding high-reliability, low-noise linear regulation across extended temperature ranges - particularly where legacy 3-pin LDO footprints and ceramic capacitor compatibility are mandatory.

FAQ

What is the minimum required output capacitance for stable operation?

The AZ1117IH-2.5TRG1 requires a minimum 10 µF ceramic output capacitor with ESR ≤20 Ω. This value ensures phase margin stability across all operating conditions, including full load and temperature extremes. Using lower capacitance or higher ESR may cause oscillation or poor transient response, as confirmed in the DS38213 Rev. 2-2 datasheet Figure 12 and Section 8.2.

Can this device replace the original AZ1117-2.5 in existing designs?

Yes - AZ1117IH-2.5TRG1 is a direct drop-in replacement for legacy AZ1117-2.5 variants in SOT223. It maintains identical pinout, electrical specifications, and thermal characteristics, while adding industrial-grade temperature qualification (-40°C to +125°C) and RoHS 3 compliance. No layout or firmware changes are needed.

Does the device require an input capacitor?

An input capacitor is strongly recommended: ≥10 µF low-ESR ceramic placed within 5 mm of Pin 1 minimizes high-frequency noise and prevents instability during fast load transients. While not strictly mandatory per absolute minimum specification, omission risks voltage spikes and degraded PSRR, as demonstrated in DS38213 Figure 15 (line transient response).

How does thermal performance differ between SOT223 and TO252-2 packages?

In SOT223, θJA is 125°C/W (no heatsink) and 100°C/W (with heatsink); in TO252-2, it is 100°C/W and 70°C/W respectively. At 1 A load and 25°C ambient, SOT223 junction temperature rises ~125°C above ambient - requiring careful PCB copper area design. TO252-2 offers superior thermal dissipation for higher ambient or sustained full-load operation.