Diodes Incorporated AZ1117CR-2.5TRG1

Overview

AZ1117CR-2.5TRG1 from Diodes Incorporated is a fixed-output 2.5 V low-dropout linear regulator in SOT89 package, delivering up to 1.35 A with ±1% output voltage accuracy, 1.3 V typical dropout at 0.8 A, and 70 dB PSRR at 120 Hz. It integrates thermal shutdown and current limiting, and is optimized for USB devices and PC motherboard power rails where transient response and input headroom are constrained.

For engineers reviewing the AZ1117CR-2.5TRG1 datasheet, AZ1117CR-2.5TRG1 pinout, AZ1117CR-2.5TRG1 application, or AZ1117CR-2.5TRG1 equivalent, key selection criteria include dropout voltage at full load, RMS output noise (0.003% of VOUT), compatibility with low-ESR ceramic capacitors (<20 Ω), minimum 10 µF output capacitance requirement, and thermal resistance (θJA = 170 °C/W without heatsink).

Technical Context

The AZ1117CR-2.5TRG1 uses a trimmed bandgap reference and internal error amplifier to maintain stable 2.5 V output across -20°C to +125°C junction temperature. Its dropout behavior is characterized by ≤1.4 V at 0.8 A in TO252-2, but for this SOT89 variant, typical dropout is 1.3 V under same conditions.

Thermal protection activates at +160°C junction temperature with +16°C hysteresis, and the device draws ≤6 mA quiescent current. It requires no external components for fixed-output operation and supports fast load transient response due to low output impedance and high PSRR at low frequencies.

Key Specifications

Pinout & Package

Package: SOT89 (3-pin, surface-mount, standard outline per Diodes Inc. documentation). Thermal pad on leadframe enhances heat dissipation; recommended PCB copper area ≥100 mm² for θJA = 150 °C/W with heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2502E/MB and TLV1117-25CDCYR, the AZ1117CR-2.5TRG1 uniquely balances 1.35 A capability, SOT89 compactness, and 70 dB PSRR-making it optimal for mid-power USB and motherboard I/O rails where size, noise, and current co-constrain selection.

Availability

AZ1117CR-2.5TRG1 is available at Aetrix Electronics and suitable for USB peripheral designs, PC motherboard I/O rails, DVD player AV subsystems, and PCIe add-on card interfaces requiring stable component supply with consistent parametric performance across production batches.

Supply support for AZ1117CR-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 company specializing in discrete, analog, and mixed-signal solutions, with emphasis on power management, signal integrity, and protection devices.

The AZ1117C series was designed for cost-sensitive, high-volume applications demanding robust LDO performance in legacy and new industrial, computing, and consumer platforms-prioritizing dropout, accuracy, and thermal resilience over ultra-low IQ.

FAQ

What is the minimum required output capacitance for stable operation?

The AZ1117CR-2.5TRG1 requires a minimum 10 µF ceramic output capacitor with ESR less than 20 Ω. This value ensures phase margin >45° and prevents oscillation under all load and temperature conditions specified in the datasheet. Larger values improve transient response but do not affect stability if ESR remains within limit.

Can this part replace the AZ1117CH-2.5TRG1 in a design?

No-AZ1117CH-2.5TRG1 uses SOT223 package (θJA = 125 °C/W), while AZ1117CR-2.5TRG1 uses SOT89 (θJA = 170 °C/W). At 1.35 A load, junction temperature rise will be ~55°C higher in SOT89 under identical PCB conditions. Derating or enhanced copper pour is required for equivalent thermal performance.

Does the device require an input capacitor?

While not strictly mandatory for stability, a 10 µF ceramic input capacitor placed within 5 mm of the VIN pin is strongly recommended. It reduces high-frequency noise coupling from upstream sources and limits inrush current during power-up, preventing input rail sag that could trigger undervoltage lockout in preceding stages.

Is the AZ1117CR-2.5TRG1 qualified for automotive applications?

No-the AZ1117CR-2.5TRG1 is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., AZ1117CQ series) with PPAP support, IATF 16949 manufacturing, and extended qualification testing. For automotive use, contact Diodes directly for Q-grade part numbers and change control documentation.