Diodes Incorporated AZ1117CH-1.8TRG1

Overview

AZ1117CH-1.8TRG1 from Diodes Incorporated is a fixed-output 1.8 V low-dropout linear regulator with ±1% output voltage accuracy, 1.35 A typical current limit, and thermal shutdown protection. It operates over -20°C to +125°C junction temperature and supports stable USB device power rails using ceramic output capacitors as low as 10 µF.

For engineers reviewing the AZ1117CH-1.8TRG1 datasheet, AZ1117CH-1.8TRG1 pinout, AZ1117CH-1.8TRG1 application, or AZ1117CH-1.8TRG1 equivalent, key selection criteria include dropout voltage (1.3 V typ at 0.8 A), PSRR (70 dB at 120 Hz), RMS output noise (0.003% of VOUT), and compatibility with low-ESR ceramic capacitors (<20 Ω).

Technical Context

The AZ1117CH-1.8TRG1 integrates a trimmed bandgap reference for ±1% output accuracy and on-chip thermal shutdown triggered at +160°C with +16°C hysteresis. Its architecture supports fast transient response due to internal compensation optimized for ceramic capacitors.

It delivers regulated 1.8 V output from input voltages up to 15 V, with dropout voltage specified at 1.3 V (TO252-2) and 1.2 V (SOT223) under 0.8 A load. Quiescent current remains ≤6 mA across operating conditions, enabling efficient operation in battery-sensitive applications.

Key Specifications

Pinout & Package

AZ1117CH-1.8TRG1 is packaged in SOT223 (H package), a surface-mount 4-pin thermally enhanced outline with exposed thermal pad. Pin 1 is INPUT, Pin 2 is OUTPUT, Pin 3 is GND, and Pin 4 is the exposed thermal tab (internally connected to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC29150-1.8WT and TLV70118DBVR, AZ1117CH-1.8TRG1 balances medium-current capability (1.35 A), low noise (0.003% VOUT), and SOT223 thermal performance-making it optimal for industrial and consumer electronics requiring robust 1.8 V regulation without excessive board area or heat sinking.

Availability

AZ1117CH-1.8TRG1 is available at Aetrix Electronics and suitable for USB peripheral power, PC add-on card designs, DVD player logic supplies, and industrial control modules requiring stable component supply and long-term manufacturability.

Supply support for AZ1117CH-1.8TRG1 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 devices, with manufacturing certified to IATF 16949 and product definitions aligned to AEC-Q standards.

The AZ1117C series is designed for cost-sensitive, high-volume industrial and consumer power management applications where low dropout, thermal robustness, and ceramic capacitor compatibility are essential.

FAQ

What is the minimum input voltage required for AZ1117CH-1.8TRG1 to maintain regulation?

The minimum input voltage is determined by dropout voltage: VIN(min) = VOUT + VDROP. At 0.8 A load in TO252-2 package, VDROP is 1.3 V (typ), so VIN must be ≥3.1 V. At lighter loads or in SOT223, dropout drops to 1.2 V, allowing VIN ≥3.0 V. Absolute minimum VIN is 2.0 V per datasheet limits, but regulation is not guaranteed below dropout threshold.

Can AZ1117CH-1.8TRG1 be used with a 4.7 µF output capacitor?

No. The datasheet specifies a minimum output capacitance of 10 µF with ESR <20 Ω for stability. Using 4.7 µF risks oscillation or poor transient response, especially under load steps. Ceramic capacitors meeting these values-such as 10 µF X5R 0805-are validated and recommended.

Is AZ1117CH-1.8TRG1 pin-compatible with other AZ1117C variants?

Yes-AZ1117CH-1.8TRG1 shares identical SOT223 pinout (INPUT, OUTPUT, GND, thermal tab) with all AZ1117CH-x.xTRG1 fixed-output variants (1.2 V to 5.0 V). This allows drop-in replacement during design iteration or voltage scaling, provided PCB layout accommodates same thermal pad soldering requirements.

Does AZ1117CH-1.8TRG1 require an input capacitor?

Yes. A minimum 10 µF ceramic input capacitor placed near the INPUT pin is required to limit source impedance and prevent instability during load transients. Diodes recommends X5R/X7R dielectrics with low ESR; placement within 5 mm of the INPUT and GND pins is critical for optimal performance.