Diodes Incorporated AZ1117S-5.0E1

Overview

AZ1117S-5.0E1 from Diodes Incorporated is a fixed-output 5.0V, 1A low-dropout linear regulator in TO263 (D2PAK) package, featuring 1.15V dropout at full load, ±1% output voltage accuracy over temperature, and integrated thermal shutdown and current limiting. It delivers stable local regulation for FPGA I/O banks, USB peripheral power rails, and embedded microcontroller core supplies.

For engineers reviewing the AZ1117S-5.0E1 datasheet, AZ1117S-5.0E1 pinout, AZ1117S-5.0E1 application, or AZ1117S-5.0E1 equivalent, key selection criteria include dropout voltage at 1A, thermal resistance (θJC = 10°C/W), output voltage tolerance across -40°C to +125°C, and compatibility with 22µF tantalum or ceramic output capacitors.

Technical Context

The AZ1117S-5.0E1 uses a trimmed bandgap reference and PNP pass transistor architecture to achieve 1% initial output accuracy and <0.5% temperature stability. Its internal current limit is factory-trimmed to 1.25–1.35A, ensuring predictable short-circuit behavior without external sensing.

Thermal shutdown activates at +150°C junction temperature with +25°C hysteresis, and the device operates continuously from -40°C to +125°C ambient when mounted on PCBs meeting recommended copper pour guidelines. Ripple rejection reaches 75dB at 120Hz with 22µF output capacitance.

Key Specifications

Pinout & Package

TO263-3 (D2PAK) package with exposed thermal pad; requires minimum 100mm² copper pour for θJA ≤ 60°C/W. Pin 1: INPUT, Pin 2: OUTPUT, Pin 3: GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-5002E/MB and TLV1117-50CDCYR, the AZ1117S-5.0E1 uniquely balances 1A capability, 1.15V dropout, ±1% accuracy, and D2PAK thermal performance - making it optimal for thermally demanding 5V distribution in industrial and computing platforms.

Availability

AZ1117S-5.0E1 is available at Aetrix Electronics and suitable for PC motherboard VRM auxiliary rails, LCD monitor logic supplies, and industrial PLC I/O modules requiring stable component supply with long-term manufacturability.

Supply support for AZ1117S-5.0E1 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 design centers in Asia, Europe, and the US, serving industrial, computing, and consumer markets.

The AZ1117 series was developed for cost-sensitive, high-reliability local regulation in computing peripherals and industrial control systems - emphasizing thermal robustness, tight DC accuracy, and broad package availability.

FAQ

What is the minimum input voltage required for AZ1117S-5.0E1 to maintain regulation at 1A?

The minimum input voltage is 6.5V, derived from the 5.0V nominal output plus the maximum dropout voltage of 1.25V at 1A (per Electrical Characteristics table). Operation below 6.5V risks dropout and unregulated output, especially at elevated temperatures where dropout increases.

Can AZ1117S-5.0E1 be used with ceramic output capacitors?

Yes - the device is stable with ceramic capacitors ≥22µF and ESR ≥15mΩ. Unlike older LDOs, it does not require high-ESR tantalum; however, a 1µF ceramic bypass capacitor must be placed within 3mm of the INPUT pin to suppress high-frequency noise.

Is thermal pad soldering required for AZ1117S-5.0E1 in TO263 package?

Yes - the exposed thermal pad (Pin 4, electrically connected to GND) must be soldered to a ≥100mm² copper area with ≥4 thermal vias to inner ground planes. Omitting this reduces θJC from 10°C/W to >30°C/W, risking thermal shutdown above 600mA at +70°C ambient.

Does AZ1117S-5.0E1 support reverse-polarity input protection?

No - the device lacks internal reverse-voltage protection. Applying negative voltage to INPUT relative to GND may damage the internal PNP pass transistor. An external series Schottky diode (e.g., 1N5819) is required if reverse polarity exposure is possible in the system.