Diodes Incorporated AP7361EA-33ER-13

Overview

AP7361EA-33ER-13 from Diodes Incorporated is a 1A fixed-output (3.3V), ultra-low dropout linear regulator with enable functionality, designed for power rail regulation in space-constrained, battery-sensitive systems. It delivers ±1% output accuracy, 360mV dropout at 1A (3.3V output), 68µA quiescent current, and integrates thermal shutdown, foldback current limiting (400mA short-circuit), and 75dB PSRR at 1kHz - enabling stable operation in LCD TVs, set-top boxes, and portable audio/video equipment.

For engineers reviewing the AP7361EA-33ER-13 datasheet, AP7361EA-33ER-13 pinout, AP7361EA-33ER-13 application, or AP7361EA-33ER-13 equivalent, key selection criteria include dropout voltage at full load, EN logic thresholds (VIH = 1.0V min, VIL = 0.3V max), thermal resistance (θJA = 110°C/W in SOT223R), stability with ≥2.2µF MLCC output capacitance, and compatibility with 2.2–6.0V input rails.

Technical Context

The AP7361EA-33ER-13 implements a PMOS pass transistor architecture with internal 0.8V bandgap reference and error amplifier, enabling fixed 3.3V output without external resistors. Its enable circuitry uses a high-impedance input (RENPD = 3.0MΩ) with active-high logic control and 0.1µA leakage, supporting direct microcontroller GPIO interfacing.

Protection functions operate autonomously: current limit triggers at 1.5A (foldback to 400mA under short-circuit), thermal shutdown activates at +150°C with 20°C hysteresis, and all protections remain functional across –40°C to +85°C ambient range without derating.

Key Specifications

Pinout & Package

The AP7361EA-33ER-13 is packaged in SOT223R (RoHS-compliant, exposed thermal pad), optimized for thermal performance in compact consumer power supplies. Pin assignments are validated per Diodes DS42797 Rev. 3–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3302E/MB and TLS850B2TE/VXUMA1, the AP7361EA-33ER-13 uniquely balances 1A output, 360mV dropout, enable functionality, and consumer-grade cost-making it optimal for mid-power consumer electronics where thermal margin and GPIO controllability are essential.

Availability

AP7361EA-33ER-13 is available at Aetrix Electronics and suitable for LCD TV power rails, set-top box core logic supplies, and portable audio amplifier biasing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AP7361EA-33ER-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 company specializing in discrete, analog, and mixed-signal components, with design centers in Asia, Europe, and the U.S., and manufacturing in certified ISO/TS 16949 and ISO 14001 facilities.

The AP7361EA belongs to Diodes' high-performance LDO regulator product line, engineered for low-noise, low-dropout power management in consumer, computing, and industrial applications where efficiency, small size, and reliability are critical.

FAQ

What is the maximum input voltage for AP7361EA-33ER-13?

The absolute maximum input voltage is 6.5V, but the recommended operating range is 2.2V to 6.0V. Exceeding 6.0V risks violating the 0.3V overvoltage limit on EN, ADJ, and OUT pins relative to IN, potentially damaging internal protection structures. Operation above 6.0V is not characterized or guaranteed.

Can AP7361EA-33ER-13 be used without an enable signal?

Yes - tie the EN pin directly to the IN pin to maintain continuous operation. This configuration disables enable control but retains all regulation, protection, and thermal features. Do not leave EN floating, as its 3.0MΩ internal pull-down may allow noise-induced toggling in high-EMI environments.

Does AP7361EA-33ER-13 require a minimum load current?

No - the device remains stable and regulated with zero load current. The datasheet explicitly states "no minimum load is required," and the internal error amplifier and reference circuitry maintain regulation down to 0A output, making it suitable for intermittent-load applications like sensor wake-up circuits.

How does thermal performance differ between SOT223 and SOT223R packages?

The SOT223R package features an enhanced thermal pad layout and optimized die attach, achieving θJA = 110°C/W (vs. 120°C/W for standard SOT223). This 10°C/W improvement allows ~15% higher continuous output current at +85°C ambient before thermal shutdown, verified in Diodes' characterization data for DS42797 Rev. 3–2.