Diodes Incorporated AP7361EA-12ER-13

Overview

AP7361EA-12ER-13 from Diodes Incorporated is a 1A, fixed-output (1.2V), ultra-low dropout linear regulator with enable functionality in SOT223R package. It delivers ±1% output voltage accuracy, 360mV dropout at 1A (for 3.3V variant; 1.2V dropout is 600mV typ), and 68µA quiescent current. Designed for power-sensitive applications including LCD TVs, set-top boxes, and battery-powered audio/video equipment.

For engineers reviewing the AP7361EA-12ER-13 datasheet, AP7361EA-12ER-13 pinout, AP7361EA-12ER-13 application, or AP7361EA-12ER-13 equivalent, key selection criteria include dropout performance at 1.2V output, thermal shutdown threshold (150°C), EN logic thresholds (VIH=1.0V min), PSRR (75dB @ 1kHz), and compatibility with 2.2µF MLCC output capacitors.

Technical Context

The AP7361EA-12ER-13 implements a PMOS pass transistor architecture enabling ultra-low dropout operation and stable regulation down to 1.2V output. Its internal 0.8V bandgap reference and error amplifier support precise feedback control across ambient temperatures from –40°C to +85°C.

Enable functionality is implemented via a high-threshold CMOS input (VIH ≥ 1.0V) with 3.0MΩ internal pull-down resistor; the EN pin directly controls gate driver activation without external biasing. Foldback short-circuit protection limits output current to 400mA during fault conditions while maintaining thermal shutdown at 150°C junction temperature with 20°C hysteresis.

Key Specifications

Pinout & Package

SOT223R package: thermally enhanced 4-pin variant with exposed pad connected to GND for improved heat dissipation (θJA = 110°C/W, θJC = 21.8°C/W). Requires minimum 25mm² copper area under exposed pad with ≥4 thermal vias to inner ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1202E/MB and TLS850B2TE/V33, the AP7361EA-12ER-13 uniquely balances 1A output, 68µA IQ, foldback protection, and industrial temperature range in a thermally robust SOT223R package-making it optimal for cost-sensitive, medium-current consumer electronics where automotive qualification is unnecessary.

Availability

AP7361EA-12ER-13 is available at Aetrix Electronics and suitable for LCD TV power management, set-top box subsystem regulation, and battery-powered audio/video equipment requiring stable component supply across production volumes.

Supply support for AP7361EA-12ER-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The AP7361EA belongs to Diodes' high-performance LDO family targeting low-noise, low-dropout regulation in space- and power-constrained applications-designed specifically for consumer electronics requiring precision voltage control without complex external circuitry.

FAQ

What is the minimum input voltage required for stable 1.2V output at 1A?

The AP7361EA-12ER-13 requires VIN ≥ 1.8V to maintain regulation at 1A load, based on its 600mV typical dropout voltage at 300mA and 840mV at 1A (per datasheet Note 6). At 1A, minimum VIN = 1.2V + 0.84V = 2.04V; derating to 2.2V ensures margin across temperature and process variation.

Can the EN pin be left floating?

No. The EN pin has a 3.0MΩ internal pull-down resistor but must not be left floating in production designs. Floating EN risks unintended turn-off due to noise coupling. For always-on operation, tie EN directly to IN; for controlled enable, drive with a clean logic signal meeting VIH ≥ 1.0V and VIL ≤ 0.3V.

Is an external capacitor required on the ADJ pin for the AP7361EA-12ER-13?

No. The AP7361EA-12ER-13 is a fixed 1.2V output variant; the ADJ pin is internally connected and unused (NC). Per datasheet Pin Descriptions, ADJ/NC is "Adjustable voltage version only." No external components are needed on this pin for fixed-output operation.

How does thermal performance differ between SOT223 and SOT223R packages?

The SOT223R package adds an exposed thermal pad that reduces θJA from 110°C/W (SOT223) to effectively ~75°C/W with proper PCB layout (≥25mm² copper, 4+ thermal vias). This allows ~30% higher continuous current before thermal shutdown compared to standard SOT223 under identical ambient conditions.