Diodes Incorporated AZ1117H-2.5TRG1

Overview

AZ1117H-2.5TRG1 from BCD Semiconductor Manufacturing Limited is a fixed-output 2.5V, 1A low-dropout linear regulator in SOT-223 package, featuring 1.15V dropout at full load, ±1% output voltage accuracy over temperature and load, integrated thermal shutdown and current limiting. It delivers stable local regulation for FPGA I/O banks, USB PHY power rails, and embedded microcontroller core supplies.

For engineers reviewing the AZ1117H-2.5TRG1 datasheet, AZ1117H-2.5TRG1 pinout, AZ1117H-2.5TRG1 application, or AZ1117H-2.5TRG1 equivalent, key selection criteria include dropout voltage at 1A, thermal shutdown threshold (150°C), output accuracy (±1%), quiescent current (5–10mA), and SOT-223 thermal resistance (120°C/W).

Technical Context

The AZ1117H-2.5TRG1 uses a trimmed bandgap reference and PNP pass transistor architecture to achieve precise 2.5V output with <±1% initial tolerance and 0.5% temperature stability. Its internal current limit is factory-trimmed to 1.25–1.35A, ensuring predictable short-circuit behavior without external components.

Thermal protection activates at 150°C junction temperature with 25°C hysteresis, enabling automatic recovery after overload removal. Ripple rejection reaches 60–75dB at 120Hz with 22µF tantalum output capacitance, supporting noise-sensitive analog and digital subsystems.

Key Specifications

Pinout & Package

SOT-223 package: 3-pin surface-mount, exposed thermal pad on underside for enhanced heat dissipation (θJA = 120°C/W, no heatsink). Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GND (fixed-output variant; no ADJ pin).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with MIC29302WU-2.5 and TLV1117-25CDCY, the AZ1117H-2.5TRG1 offers best-in-class thermal robustness (150°C shutdown) and proven reliability in industrial ambient conditions, while maintaining pin compatibility with legacy SOT-223 LDO footprints.

Availability

AZ1117H-2.5TRG1 is available at Aetrix Electronics and suitable for PC motherboard auxiliary rails, LCD monitor timing controller supplies, and industrial PLC I/O modules requiring stable component supply with long-term lifecycle support.

Supply support for AZ1117H-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

BCD Semiconductor Manufacturing Limited is a China-based fabless analog IC supplier specializing in power management, LED drivers, and mixed-signal solutions for consumer, industrial, and computing markets.

The AZ1117 series was designed as a cost-optimized, drop-in replacement for legacy LM1117-compatible LDOs, targeting high-volume embedded systems where thermal resilience and RoHS compliance are mandatory.

FAQ

What is the minimum input voltage required for stable 2.5V output at 1A?

The AZ1117H-2.5TRG1 requires a minimum input voltage of 3.65V to maintain regulation at 1A load, based on its 1.15V dropout specification. Below this, output voltage collapses linearly with input; design margin of ≥0.3V above dropout is recommended for transient headroom.

Can AZ1117H-2.5TRG1 replace LM1117-2.5 in existing designs?

Yes - AZ1117H-2.5TRG1 is pin- and function-compatible with LM1117-2.5 in SOT-223 package, matching electrical specs including dropout, accuracy, and thermal shutdown. The "G1" green packaging also satisfies modern RoHS and halogen-free requirements where LM1117 may not.

Is an external capacitor required on the output pin?

Yes - a minimum 22µF low-ESR capacitor (tantalum or polymer) is required on the OUTPUT pin for stability and transient response. Ceramic capacitors ≥10µF may be used if combined with a 1–2Ω damping resistor in series to meet ESR requirements specified in the datasheet.

Does AZ1117H-2.5TRG1 support reverse-voltage protection?

No - the device lacks intrinsic reverse-voltage protection. If input can fall below output (e.g., during hot-swap or backup battery switchover), an external Schottky diode from INPUT to OUTPUT is required to prevent reverse current flow and potential damage.