Diodes Incorporated AP7365-18WG-7

Overview

AP7365-18WG-7 from Diodes Incorporated is a fixed-output 1.8V, 600mA low-dropout linear regulator with 35μA quiescent current, 300mV dropout at full load, and enable control. It integrates current limit, thermal shutdown, and fast transient response for battery-powered portable electronics requiring stable low-voltage core/I/O supply.

For engineers reviewing the AP7365-18WG-7 datasheet, AP7365-18WG-7 pinout, AP7365-18WG-7 application, or AP7365-18WG-7 equivalent, key selection criteria include dropout voltage under 600mA load, PSRR performance at 1kHz, EN logic thresholds, thermal resistance in SOT25, and compatibility with 1μF ceramic output capacitors.

Technical Context

The AP7365-18WG-7 implements a PMOS pass transistor architecture enabling ultra-low quiescent current (35μA typ.) while maintaining fast 200μs start-up and excellent load transient response. Its internal 0.8V bandgap reference and error amplifier regulate output precisely across -40°C to +85°C ambient.

Designed for input voltages from 2V to 6V, it delivers stable 1.8V ±2% output accuracy with <0.2%/V line regulation and ±1.0% load regulation over 1mA–600mA. Built-in protection includes thermal shutdown at +145°C with +15°C hysteresis and short-circuit current limiting to 240mA.

Key Specifications

Pinout & Package

SOT25 (W package) - 5-pin surface-mount package with exposed thermal pad on underside; footprint optimized for low thermal resistance (θ_JA = 169°C/W) on standard FR-4 PCBs with minimum recommended copper area.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO applications.

Compared with MCP1700-1802E/TO and TLS850B2TE/V33, the AP7365-18WG-7 uniquely balances 600mA output, 35μA IQ, EN control, and 300mV dropout in a compact SOT25 - making it optimal for portable FPGA, DSP, and BLE subsystems where all four parameters are simultaneously critical.

Availability

AP7365-18WG-7 is available at Aetrix Electronics and suitable for portable medical sensors, FPGA I/O power rails, smart home motion detectors, and USB-C peripheral controllers requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP7365-18WG-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP7365 belongs to Diodes' precision LDO portfolio targeting battery-powered and space-constrained applications - designed specifically to deliver low IQ, fast transient response, and robust protection in minimal footprint packages like SOT25 and U-DFN2020-6.

FAQ

What is the minimum input voltage required for AP7365-18WG-7 to maintain regulation at 600mA?

The AP7365-18WG-7 requires VIN ≥ (VOUT + VDROPOUT) = 1.8V + 0.37V = 2.17V to sustain 600mA output while staying within specification. At 2V input, regulation is not guaranteed per datasheet absolute maximum ratings, which specify 2V as minimum recommended operating voltage only for no-load or light-load conditions.

Can AP7365-18WG-7 operate without an output capacitor?

No - the AP7365-18WG-7 requires a minimum 1μF ceramic output capacitor with ESR >15mΩ for stability, as confirmed in the Application Information section. Omitting it risks oscillation, excessive overshoot/undershoot during transients, and potential thermal shutdown due to instability-induced power dissipation.

Is the EN pin internally pulled up or down?

The EN pin has no internal pull-up or pull-down; it is a high-impedance CMOS input requiring external bias. To ensure reliable turn-on, EN must be driven above 1.4V (VIH min); to guarantee shutdown, it must be pulled below 0.4V (VIL max). Leaving EN floating may result in undefined output state.

Does AP7365-18WG-7 support adjustable output configurations?

No - AP7365-18WG-7 is a fixed 1.8V output variant in SOT25 package. Adjustable versions (e.g., AP7365-WG-7) exist but require external resistor divider on ADJ pin and are only offered in SOT25 and U-DFN2020-6 packages - not in the -18WG-7 marking.