Diodes Incorporated AZ1117CH-1.2TRG1

Overview

AZ1117CH-1.2TRG1 from Diodes Incorporated is a fixed-output 1.2 V low-dropout linear regulator with ±1.2% output voltage accuracy (1.176–1.224 V), 1.35 A typical current limit, and 1.3 V typical dropout voltage at 0.8 A load in SOT223 package. It integrates thermal shutdown and current-limit protection, and is optimized for USB devices and PC motherboard power rails where input headroom and transient response are critical.

For engineers reviewing the AZ1117CH-1.2TRG1 datasheet, AZ1117CH-1.2TRG1 pinout, AZ1117CH-1.2TRG1 application, or AZ1117CH-1.2TRG1 equivalent, key selection criteria include dropout voltage at full load, output accuracy over -20°C to +125°C, compatibility with low-ESR ceramic capacitors, and thermal performance in SOT223 without heatsink.

Technical Context

The AZ1117CH-1.2TRG1 uses an internal trimmed bandgap reference and PNP pass transistor architecture to achieve stable 1.2 V output with minimal input-to-output differential. Its feedback loop is internally compensated for stability with ≥10 µF ceramic output capacitance (ESR < 20 Ω).

Thermal protection activates at +160°C junction temperature with +16°C hysteresis, and quiescent current remains ≤6 mA across operating conditions. The device operates from 1.5 V to 15 V input and supports load currents up to 1.35 A with guaranteed regulation down to 1.2 V output.

Key Specifications

Pinout & Package

Package: SOT223 (TO-261AA), 4-pin configuration with exposed thermal pad (pin 4). Standard pinout: Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = GND, Pin 4 = GND (thermal tab).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29302WU-1.2 and TLV70012QDDCR, the AZ1117CH-1.2TRG1 offers optimal balance of current capability (1.35 A), thermal robustness in SOT223, and cost-effective fixed-output design for mainstream embedded power rails - making it preferred for volume industrial and computing applications where 1.2 V precision and reliability are prioritized over ultra-low IQ or ultra-low dropout.

Availability

AZ1117CH-1.2TRG1 is available at Aetrix Electronics and suitable for USB peripheral power, PC motherboard auxiliary rails, add-on card core logic, and DVD player SoC power requiring stable component supply across industrial temperature ranges and multi-year production cycles.

Supply support for AZ1117CH-1.2TRG1 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 components for industrial, computing, consumer, and communications markets.

The AZ1117C series is part of Diodes' precision linear regulator product line, designed specifically for low-noise, high-accuracy power delivery in space- and thermally-constrained embedded systems.

FAQ

What is the minimum input voltage required for stable 1.2 V output at 800 mA?

The AZ1117CH-1.2TRG1 requires VIN ≥ VOUT + VDROP = 1.2 V + 1.3 V = 2.5 V minimum at 800 mA load, per datasheet Section 5 (Electrical Characteristics). At lighter loads, dropout decreases - e.g., ~0.8 V at 100 mA - but 2.5 V ensures regulation across full temperature and process variation.

Can this regulator operate with a 4.7 µF ceramic output capacitor?

No. The datasheet mandates a minimum 10 µF ceramic output capacitor with ESR < 20 Ω for stability. Using 4.7 µF risks oscillation or poor transient response, as confirmed in Section 7 (Typical Applications Circuit) and Absolute Maximum Ratings notes. Always meet the 10 µF minimum for reliable operation.

Is the SOT223 package lead-free and RoHS compliant?

Yes. The AZ1117CH-1.2TRG1 is fully RoHS 3 compliant (2015/863/EU), lead-free, and halogen/antimony-free ("Green" per Diodes' definition: <900 ppm Br+Cl, <1000 ppm Sb), as stated in the Features section and Notes 1–3 of the datasheet.

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

Yes. A minimum 10 µF ceramic input capacitor is recommended close to the INPUT and GND pins to suppress source impedance and improve line transient response. While not strictly mandatory for basic regulation, omission degrades PSRR and may cause instability under fast input transients, as shown in Figure 9 (Line Transient Response) of the datasheet.