Diodes Incorporated AP7365-18SNG-7

Overview

AP7365-18SNG-7 from Diodes Incorporated is a fixed-output 1.8V, 600mA low-dropout linear regulator in U-DFN2020-6 package, featuring 35μA quiescent current, 300mV dropout at full load, and 65dB PSRR at 1kHz. It integrates enable control, thermal shutdown, and current limiting, and is optimized for FPGA I/O power, battery-powered portable devices, and low-power embedded systems requiring stable 1.8V rail generation.

For engineers reviewing the AP7365-18SNG-7 datasheet, AP7365-18SNG-7 pinout, AP7365-18SNG-7 application, or AP7365-18SNG-7 equivalent, key selection criteria include its ultra-low IQ, fast 200μs startup, compatibility with 1μF ceramic output capacitors, and thermal performance in space-constrained U-DFN2020-6 layout.

Technical Context

The AP7365-18SNG-7 implements a PMOS pass transistor architecture enabling low dropout (300mV @ 600mA) and high PSRR (65dB @ 1kHz). Its internal 0.8V bandgap reference and error amplifier regulate output precisely across -40°C to +85°C ambient range.

Enable logic operates with VIH ≥ 1.4V and VIL ≤ 0.4V, supporting direct microcontroller GPIO control. Built-in thermal shutdown activates at ~145°C with 15°C hysteresis, and current limit clamps output to ~1.4A under overload and ~240mA during short-circuit conditions.

Key Specifications

Pinout & Package

AP7365-18SNG-7 is housed in a 2.0mm × 2.0mm, 0.65mm height U-DFN2020-6 package with exposed thermal pad (pin 1–6 layout). The package supports high-density PCB layouts and provides θ_JA = 132°C/W on standard FR-4 board.

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 XC6219B182MR-G, AP7365-18SNG-7 uniquely balances 600mA delivery, 35μA IQ, 200μs startup, and 2.0mm × 2.0mm footprint - making it optimal for space-limited, battery-powered systems demanding both high current and low standby loss.

Availability

AP7365-18SNG-7 is available at Aetrix Electronics and suitable for FPGA I/O power, portable medical sensors, and wearable audio processors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7365-18SNG-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 company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

The AP7365 series targets low-power, space-constrained systems needing high-efficiency linear regulation - particularly battery-operated consumer, industrial, and computing devices where IQ, size, and transient performance are critical.

FAQ

What is the minimum input voltage required for AP7365-18SNG-7 to maintain 1.8V regulation at 600mA?

The device requires VIN ≥ VOUT + VDROPOUT = 1.8V + 0.37V = 2.17V (max dropout for VOUT < 2.5V) to sustain regulation at full load. At 25°C and 600mA, typical dropout is 300mV, so 2.1V input suffices. Below 2V input, regulation fails per absolute maximum ratings.

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

No. A minimum 1μF ceramic capacitor with ESR > 15mΩ is mandatory at the OUT pin for stability and transient response. Omitting it causes oscillation, voltage overshoot, and potential damage. Larger capacitance improves line/load transient behavior but is not required for basic stability.

Is the ADJ pin functional in AP7365-18SNG-7?

No. AP7365-18SNG-7 is a fixed-output variant; the ADJ pin (Pin 6) is internally disconnected and must remain unconnected. It serves no function and should not be tied to any voltage or ground - doing so may compromise reliability or violate internal biasing.

How does thermal performance differ between U-DFN2020-6 and SOT25 packages for AP7365-18SNG-7?

U-DFN2020-6 offers θ_JA = 132°C/W versus SOT25's 169°C/W on identical FR-4 boards. This 37°C/W improvement allows ~25% higher power dissipation before thermal shutdown - critical in compact designs where airflow is limited and thermal pad soldering is optimized.