Diodes Incorporated AP7366-33SN-7

Overview

AP7366-33SN-7 from Diodes Incorporated is a 600mA, fixed 3.3V output, low dropout linear regulator in U-DFN2020-6 package. It features 60μA quiescent current, 250mV dropout at full load, ±1% output accuracy at room temperature, and integrated enable control and thermal shutdown. It powers FPGA I/O rails and battery-powered portable electronics requiring stable, ultra-low-quiescent regulation.

For engineers reviewing the AP7366-33SN-7 datasheet, AP7366-33SN-7 pinout, AP7366-33SN-7 application, or AP7366-33SN-7 equivalent, key selection criteria include dropout voltage at 600mA, enable logic polarity, thermal shutdown threshold, output accuracy over temperature, and U-DFN2020-6 PCB layout compatibility with 0.5mm pitch.

Technical Context

The AP7366-33SN-7 uses a PMOS pass transistor architecture enabling ultra-low dropout (250mV @ 600mA) and reverse-polarity protection. Its bandgap reference and error amplifier deliver ±1% initial output accuracy with line regulation of 0.02%/V and load regulation of 0.1%/A.

Enable functionality is active-high with 1.2V logic threshold; internal current limit is 800mA typical and thermal shutdown activates at 150°C junction temperature. Input voltage range is 2.6V to 6.0V, supporting dual-AA/AAA battery operation down to 2.6V.

Key Specifications

Pinout & Package

AP7366-33SN-7 is housed in a 2.0mm × 2.0mm, 0.5mm pitch, 6-pin U-DFN2020-6 package with exposed thermal pad (EP) connected to GND for enhanced thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-3302E/TO and XC6219B332MR-G, AP7366-33SN-7 uniquely delivers 600mA output, active-high enable, and U-DFN2020-6 thermal performance in a 3.3V fixed variant-making it optimal for compact, battery-sensitive FPGA and IoT edge node designs.

Availability

AP7366-33SN-7 is available at Aetrix Electronics and suitable for portable medical sensors, FPGA I/O power supplies, industrial PLC I/O modules, and smart home hub controllers requiring stable component supply with guaranteed long-term availability.

Supply support for AP7366-33SN-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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP7366 series belongs to Diodes' precision LDO portfolio, engineered specifically for space-constrained, battery-operated systems demanding ultra-low IQ, tight output accuracy, and robust fault protection.

FAQ

What is the recommended input capacitor for AP7366-33SN-7?

A minimum 1μF X5R/X7R ceramic capacitor with ≤100mΩ ESR is required at the IN pin. Place it within 2mm of the IN and GND pins. Larger values (2.2–4.7μF) improve transient response and reduce input ripple, especially when sourced from high-impedance supplies like battery packs.

Does AP7366-33SN-7 require an external feedback resistor network?

No. AP7366-33SN-7 is a fixed-output variant with internal resistor divider set to 3.3V. Unlike the adjustable AP7366-ADJ versions, it has no ADJ pin and does not support external voltage programming. Pin 5 is NC and must remain unconnected.

How does the thermal pad (EP) affect thermal performance?

The exposed thermal pad (Pin 6) is electrically tied to GND and must be soldered to a dedicated PCB copper pour with ≥4 thermal vias to inner ground planes. This reduces θ_JA from 190°C/W (no pad connection) to 65°C/W, enabling 600mA continuous operation at 70°C ambient without derating.

Can AP7366-33SN-7 be used with a 2.4V input source?

No. The absolute minimum input voltage is 2.6V per datasheet specification. At 2.4V, the device cannot regulate 3.3V output and will drop out. For 2.4V–2.6V operation, consider the AP7365 series (2.2V min VIN) or verify actual dropout behavior under load in prototype testing.