Diodes Incorporated AP7361E-33FGE-7

Overview

AP7361E-33FGE-7 from Diodes Incorporated is a 1A fixed-output (3.3V), ultra-low dropout linear regulator with enable and power-good functions, designed for point-of-load regulation in space-constrained, battery-powered systems. It delivers ±1% output accuracy, 360mV dropout at 1A (3.3V output), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and 75dB PSRR at 1kHz - enabling stable 3.3V rail generation in LCD-TVs, set-top boxes, and home appliances.

For engineers reviewing the AP7361E-33FGE-7 datasheet, AP7361E-33FGE-7 pinout, AP7361E-33FGE-7 application, or AP7361E-33FGE-7 equivalent, this page provides verified technical context, validated pin-level circuit roles, confirmed operating conditions (−40°C to +85°C ambient), real-world load transient response data, and precise alternative selection guidance - all derived from Diodes' official DS41964 Rev. 2-2 datasheet.

Technical Context

The AP7361E-33FGE-7 implements a PMOS pass transistor architecture with internal 0.8V bandgap reference and error amplifier, enabling fixed 3.3V output without external resistors. Its EN pin accepts logic-high input (≥1.0V) to activate regulation, while the open-drain PG pin asserts low when VOUT falls below 82–85% of nominal (2.706–2.805V) or during shutdown.

It features built-in fold-back current limiting (triggers at ~1.5A, clamps short-circuit current to 400mA), thermal shutdown at +150°C with +20°C hysteresis, and stability with ≥2.2µF MLCC output capacitors. The U-DFN3030-8 (Type E) package provides 70°C/W junction-to-ambient thermal resistance under standard PCB layout conditions.

Key Specifications

Pinout & Package

The AP7361E-33FGE-7 is housed in a thermally enhanced U-DFN3030-8 (Type E) package with exposed thermal pad, measuring 3.0mm × 3.0mm × 0.6mm and rated for 1700mW power dissipation under JEDEC-standard PCB layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-3302E/TO and TLS850B2TE/V33, the AP7361E-33FGE-7 uniquely combines 1A output, 360mV dropout, integrated PG, and compact U-DFN3030-8 packaging - making it optimal for consumer electronics demanding high current density and precise rail monitoring without automotive overhead.

Availability

AP7361E-33FGE-7 is available at Aetrix Electronics and suitable for LCD-TVs, set-top boxes, and home appliance control systems requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7361E-33FGE-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, with design centers across Asia, Europe, and the US and ISO/TS 16949-certified manufacturing facilities.

The AP7361E belongs to Diodes' high-performance LDO regulator product line, engineered specifically for low-noise, low-dropout point-of-load regulation in consumer, computing, and industrial applications where efficiency, small size, and reliability are critical.

FAQ

What is the minimum input voltage required for AP7361E-33FGE-7 to maintain 3.3V output at 1A?

The minimum input voltage is calculated as VOUT + VDROPOUT = 3.3V + 0.36V = 3.66V. At 1A load and +25°C, the typical dropout is 360mV; the datasheet confirms stable regulation down to this input level. Below 3.66V, output voltage will drop proportionally - e.g., at 3.5V input, output falls to ~3.14V.

Can the PG pin be pulled up to a voltage higher than the IN pin?

Yes - the PG pin is an open-drain output rated for up to 6V on the pull-up rail, which may exceed the IN voltage. Diodes' datasheet explicitly permits pulling PG to VIN, VOUT, or any other supply ≤6V. A 100kΩ resistor to a 5V auxiliary rail is a common implementation for independent sequencing.

Is an external capacitor required on the ADJ pin for the AP7361E-33FGE-7?

No - the "33" suffix denotes the fixed 3.3V output version, where Pin 3 (ADJ/NC) is internally disconnected and must remain unconnected. External resistors or capacitors on this pin are unnecessary and could impair operation. Only IN, OUT, GND, EN, and PG require external components.

How does thermal shutdown behave under sustained overload conditions?

When junction temperature reaches +150°C, the device disables the pass transistor and forces OUT low. After cooling to +130°C (20°C hysteresis), regulation automatically resumes. This cycling prevents permanent damage but causes output voltage oscillation - proper PCB thermal design (copper pour, vias to inner ground planes) is essential to avoid repeated tripping at 1A loads.