Diodes Incorporated AP7366EA-18W5-7

Overview

AP7366EA-18W5-7 from Diodes Incorporated is a fixed-output 1.8V, 600mA low-dropout linear regulator in SOT25 package, featuring 60μA quiescent current, 300mV dropout at full load, and integrated enable control. It delivers stable power to FPGA I/O rails, DSP cores, and battery-powered consumer electronics requiring high PSRR (75dB @ 1kHz) and fast transient response.

For engineers reviewing the AP7366EA-18W5-7 datasheet, AP7366EA-18W5-7 pinout, AP7366EA-18W5-7 application, or AP7366EA-18W5-7 equivalent, this page provides verified electrical parameters, thermal performance data, EN-controlled startup timing (150μs), and SOT25 package layout guidance for reliable integration into space-constrained, low-power designs.

Technical Context

The AP7366EA-18W5-7 integrates a PMOS pass element with bandgap reference, error amplifier, and thermal shutdown circuitry. Its fixed 1.8V output is internally trimmed to ±1% accuracy over load and temperature, eliminating external feedback resistors.

It operates across 2.2V–6V input range with built-in current limit (1.0A typ.) and short-circuit protection clamping output to 250mA. Thermal shutdown activates at +150°C with +20°C hysteresis, enabling safe operation under sustained overload conditions.

Key Specifications

Pinout & Package

SOT25 package (3.0mm × 2.8mm × 1.3mm), thermally enhanced with exposed pad not connected internally; requires soldering to PCB copper for optimal θJA = 139°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1802E/TO and TPL7407LADGQR, the AP7366EA-18W5-7 uniquely combines 600mA drive, 60μA IQ, EN control, thermal shutdown, and 75dB PSRR in a single-channel SOT25 package-making it optimal for FPGA/DSP power where both current capacity and noise immunity are critical.

Availability

AP7366EA-18W5-7 is available at Aetrix Electronics and suitable for FPGA I/O power, DSP core supply, portable medical sensors, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7366EA-18W5-7 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 solutions for power management, signal integrity, and connectivity applications.

The AP7366EA belongs to Diodes' low-quiescent-current LDO family, engineered specifically for battery-powered and thermally constrained systems demanding high PSRR, fast transient response, and robust fault protection.

FAQ

What is the minimum input voltage required for stable 1.8V output at 600mA?

The AP7366EA-18W5-7 requires VIN ≥ 2.1V to maintain regulation at full load, based on its 300mV dropout specification (1.8V + 0.3V = 2.1V). Operation below 2.2V is not recommended per absolute maximum ratings, and PSRR degrades below 2.3V.

Can the EN pin be left unconnected, or must it be tied high?

The EN pin must not be left floating-it must be actively driven or tied to IN (via resistor or direct connection) to ensure predictable startup. Internal pull-down resistance is 3MΩ, insufficient for noise immunity in noisy environments; tying to IN guarantees reliable enable behavior.

Is an external capacitor required on the ADJ pin for the AP7366EA-18W5-7?

No. The AP7366EA-18W5-7 is a fixed-output variant; the ADJ pin is not present in this configuration. Pin 4 is NC (no connection), and no external components are needed for output voltage setting-only standard 1μF input and output ceramic capacitors are required.

How does thermal performance differ between SOT25 and U-DFN2020-6 packages?

The U-DFN2020-6 package offers θJA = 46.2°C/W versus 139°C/W for SOT25-enabling ~3× higher power dissipation before thermal shutdown. However, AP7366EA-18W5-7 uses SOT25 (W5 suffix), so thermal design must account for its higher junction-to-ambient resistance using adequate PCB copper area.