Diodes Incorporated AP7361-12D-13

Overview

AP7361-12D-13 from Diodes Incorporated is a 1A fixed-output low-dropout linear regulator with 1.2V output, enable control, and ultra-low 500mV dropout at full load. It features 70µA quiescent current, ±1% output accuracy, and thermal shutdown protection. Designed for power-sensitive applications including portable audio systems, FPGA I/O rails, and battery-powered instrumentation where stable low-voltage biasing is critical.

For engineers reviewing the AP7361-12D-13 datasheet, AP7361-12D-13 pinout, AP7361-12D-13 application, or AP7361-12D-13 equivalent, key selection criteria include dropout voltage at 1A, EN pin logic thresholds (1.0V min VIH), thermal resistance (95°C/W for TO252), ceramic capacitor stability (≥2.2µF), and fixed 1.2V output configuration in TO252 package.

Technical Context

The AP7361-12D-13 implements a PMOS pass transistor architecture enabling ultra-low dropout operation and high PSRR (65dB @ 1kHz). Its internal 0.8V bandgap reference and error amplifier regulate output via feedback from the fixed 1.2V trim - no external resistors required. The device integrates current limiting (1.1–1.5A), short-circuit protection (~200mA clamp), and thermal shutdown with 20°C hysteresis.

EN pin functionality is active-high with VIH ≥ 1.0V and VIL ≤ 0.3V, supporting direct microcontroller GPIO control. The TO252 package provides 95°C/W junction-to-ambient thermal resistance, requiring minimal PCB copper area for 1A continuous operation at +85°C ambient. Input voltage range is strictly 2.2V–6.0V per recommended conditions.

Key Specifications

Pinout & Package

AP7361-12D-13 uses the TO252 (DPAK) surface-mount package with exposed thermal pad. Pin 1 is IN, Pin 2 is GND, Pin 3 is OUT. No ADJ or NC pins are present in this fixed-output variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1202E/MB and XC6206P122MR-G, the AP7361-12D-13 delivers 3.3× higher current capability, integrated enable control, and robust fault protection - making it the sole viable choice for 1A, thermally demanding, or safety-critical 1.2V rail applications.

Availability

AP7361-12D-13 is available at Aetrix Electronics and suitable for FPGA power delivery, portable audio systems, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP7361-12D-13 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 AP7361 belongs to Diodes' high-performance LDO family designed specifically for low-noise, high-current, and thermally constrained applications in computing, industrial, and portable electronics.

FAQ

What is the minimum input voltage required for AP7361-12D-13 to maintain regulation at 1A?

The minimum input voltage is calculated as VOUT + VDROPOUT = 1.2V + 0.5V = 1.7V. However, the absolute minimum specified input is 2.2V per datasheet operating conditions. Below 2.2V, regulation is not guaranteed even if dropout margin exists - design must maintain VIN ≥ 2.2V.

Can AP7361-12D-13 be used without an enable signal?

Yes. The EN pin can be tied directly to IN to maintain permanent enable. This is valid because VIH threshold is 1.0V and VIN ≥ 2.2V satisfies that condition. No pull-up resistor is needed, simplifying layout for always-on applications.

Is a minimum load required for stability with AP7361-12D-13?

No minimum load is required. The device remains stable and regulated at zero load, as confirmed in the Application Information section. This enables use in standby modes where downstream circuitry draws negligible current.

What thermal considerations apply when operating AP7361-12D-13 at 1A in TO252 package?

At 1A and VIN = 4.2V, power dissipation is (4.2V − 1.2V) × 1A = 3.0W. With θJA = 95°C/W, junction rise is ~285°C above ambient - exceeding safe limits. Derating is mandatory: maximum continuous 1A requires VIN ≤ 3.2V or active heatsinking; consult thermal derating curves in DS33626 Rev. 11, page 13.