Diodes Incorporated AZ1117IH-1.5TRG1

Overview

AZ1117IH-1.5TRG1 from Diodes Incorporated is a fixed-output 1.5V low-dropout linear regulator in SOT223 package, delivering up to 1.35A output current with ±1% output voltage accuracy, 1.2V typical dropout at 0.8A, 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 biasing and transient response are critical.

For engineers reviewing the AZ1117IH-1.5TRG1 datasheet, AZ1117IH-1.5TRG1 pinout, AZ1117IH-1.5TRG1 application, or AZ1117IH-1.5TRG1 equivalent, key selection considerations include dropout voltage at 0.8A load, PSRR of 70dB at 120Hz, RMS output noise of 0.003% of VOUT, quiescent current ≤6mA, and compatibility with low-ESR ceramic capacitors (ESR <20Ω).

Technical Context

The AZ1117IH-1.5TRG1 implements a trimmed bandgap reference and internal current-limit circuitry, enabling precise 1.5V regulation across -40°C to +125°C junction temperature. Its architecture supports stable operation with ≥10µF ceramic output capacitance and requires no external compensation.

Thermal protection activates at +160°C junction temperature with +16°C hysteresis, and the device maintains ±1% output accuracy over line (1.5V ≤ VIN–VOUT ≤ 10V), load (1mA–1A), and temperature ranges. Dropout voltage remains ≤1.3V at 0.8A in SOT223 package without heatsink.

Key Specifications

Pinout & Package

Package: SOT223 - surface-mount, thermally enhanced 3-pin package with exposed thermal pad (pin 2 is output, pin 3 is ground, pin 1 is input). Thermal resistance θJA = 125°C/W (no heatsink), θJC = 15°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1502E/MB and TLV70115DBVR, the AZ1117IH-1.5TRG1 uniquely balances high output current (1.35A), tight accuracy (±1%), and industrial temperature support in a cost-effective SOT223 package-making it the only viable option for 1.5V power delivery in USB host controllers, DDR memory interfaces, and add-on card FPGA I/O rails.

Availability

AZ1117IH-1.5TRG1 is available at Aetrix Electronics and suitable for USB peripheral designs, PC motherboard auxiliary rails, add-on card FPGA I/O biasing, and DVD player digital subsystems requiring stable component supply with full industrial temperature qualification.

Supply support for AZ1117IH-1.5TRG1 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 AZ1117I series targets industrial-grade linear regulation applications demanding precision, thermal robustness, and ceramic capacitor compatibility-designed specifically for post-regulation in systems where switching noise sensitivity and wide temperature operation are critical.

FAQ

What is the minimum required output capacitance for stable operation?

The AZ1117IH-1.5TRG1 requires a minimum 10µF ceramic output capacitor with ESR less than 20Ω. This value is specified in the datasheet's Recommended Operating Conditions and validated across -40°C to +125°C. Using smaller or higher-ESR capacitors risks instability, overshoot, or oscillation during load transients.

Can this part replace the standard AZ1117-1.5 without design changes?

Yes-the AZ1117IH-1.5TRG1 is a direct replacement for the non-industrial AZ1117-1.5 in SOT223 package, sharing identical pinout, electrical specs, and thermal characteristics. The 'H' suffix denotes industrial temperature qualification (-40°C to +125°C), with no functional or layout differences required.

Does it require an input capacitor, and if so, what value?

An input capacitor is recommended but not strictly mandatory for stability. A 10µF ceramic capacitor placed close to the INPUT pin reduces high-frequency noise and improves transient response. The datasheet specifies this as good practice for all operating conditions, especially when input trace inductance exceeds 10nH.

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

In SOT223, θJA is 125°C/W (no heatsink); in TO252-2, it is 100°C/W. At 1.35A and 1.3V dropout, power dissipation is ~1.76W-resulting in ~220°C rise in SOT223 versus ~176°C in TO252-2. TO252-2 enables higher continuous current in compact layouts where PCB copper area is limited.