Diodes Incorporated AZ1117CR-ADJTRG1

Overview

AZ1117CR-ADJTRG1 from Diodes Incorporated is an adjustable low-dropout linear regulator delivering up to 1.35A output current with ±1% reference voltage accuracy (1.25V typ), 1.3V typical dropout at 0.8A, and 70dB PSRR at 120Hz - designed for USB devices, PC motherboard auxiliary rails, and add-on cards requiring stable low-voltage biasing.

For engineers reviewing the AZ1117CR-ADJTRG1 datasheet, AZ1117CR-ADJTRG1 pinout, AZ1117CR-ADJTRG1 application, or AZ1117CR-ADJTRG1 equivalent, key selection criteria include adjustable output capability via two external resistors, compatibility with low-ESR ceramic capacitors (≥10µF, ESR <20Ω), thermal shutdown at +160°C, and SOT89 package suitability for space-constrained board layouts.

Technical Context

The AZ1117CR-ADJTRG1 implements a trimmed bandgap reference with 1.25V nominal VREF and integrates current-limit protection (1.35A typ) plus thermal shutdown triggered at +160°C with +16°C hysteresis. Its architecture supports adjustable output via external R1/R2 divider while maintaining load regulation of ≤1.0% and line regulation of ≤0.2% across input-output differentials from 1.5V to 10V.

It operates over -20°C to +125°C junction temperature, requires no minimum load above 1.7mA, and achieves 0.003% RMS output noise (10Hz–10kHz) relative to VOUT. Quiescent current remains ≤6mA under no-load conditions, enabling efficient operation in battery-sensitive applications.

Key Specifications

Pinout & Package

The AZ1117CR-ADJTRG1 is packaged in the SOT89-3 surface-mount outline (3.95mm × 4.40mm × 1.55mm), featuring exposed thermal pad for enhanced heat dissipation and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302AWU and LD1117S33TR, the AZ1117CR-ADJTRG1 uniquely balances SOT89 compactness, 1.35A capability, and full adjustability - making it optimal for space-constrained, multi-rail embedded designs where flexibility and thermal efficiency are prioritized over ultra-high current or wide-input operation.

Availability

AZ1117CR-ADJTRG1 is available at Aetrix Electronics and suitable for USB peripheral power, PC motherboard auxiliary rails, and add-on card biasing requiring stable component supply with consistent lead-time and full traceability.

Supply support for AZ1117CR-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AZ1117C series was developed as a high-performance, cost-optimized LDO family targeting consumer, computing, and industrial systems needing reliable low-dropout regulation with minimal external components.

FAQ

What output voltage range can be set with AZ1117CR-ADJTRG1?

The AZ1117CR-ADJTRG1 supports output voltages from 1.25V (minimum, equal to V_REF) up to (V_IN – 1.3V), constrained by its 1.3V typical dropout voltage. For example, with 5.3V input, outputs up to 4.0V are achievable. The formula V_OUT = 1.25V × (1 + R2/R1) + I_ADJ×R2 applies, where I_ADJ ≤ 120µA.

Which output capacitors are recommended for stability?

Diodes specifies ≥10µF ceramic capacitors with ESR <20Ω for stable operation. X5R or X7R dielectrics are preferred for temperature stability. Tantalum or aluminum electrolytics are not recommended due to higher ESR and potential instability. A 22µF X5R 0805 capacitor is commonly used in reference designs.

Does AZ1117CR-ADJTRG1 require a minimum load current?

Yes - a minimum load current of 1.7mA (typical) is required to maintain regulation, per datasheet Section 7.1. This is satisfied by most downstream logic or by adding a 100kΩ bleed resistor from OUTPUT to GND. Below this threshold, output voltage may rise above nominal due to internal reference biasing.

How does thermal performance differ between SOT89 and TO252 packages?

SOT89 has θ_JA = 170°C/W (no heatsink) and θ_JC = 30°C/W, while TO252-2 offers θ_JA = 100°C/W and θ_JC = 10°C/W. For 1.35A operation at 1.3V dropout (1.76W dissipation), SOT89 junction temperature rises ~300°C above ambient without heatsinking - making TO252 mandatory for continuous high-current use. SOT89 is viable only with derating or moderate loads.