Diodes Incorporated AP7361EA-33SP-13

Overview

AP7361EA-33SP-13 from Diodes Incorporated is a 1A fixed-output (3.3V), ultra-low dropout linear regulator in SO-8EP package with enable control, ±1% output accuracy, 360mV dropout at 1A, and 68µA quiescent current-designed for stable power delivery in LCD TVs, set-top boxes, and home appliances.

For engineers reviewing the AP7361EA-33SP-13 datasheet, AP7361EA-33SP-13 pinout, AP7361EA-33SP-13 application, or AP7361EA-33SP-13 equivalent, key selection factors include dropout voltage at full load, EN logic thresholds, thermal resistance (θ_JA = 100°C/W), PSRR (75dB @ 1kHz), and compatibility with 2.2µF MLCC output capacitors.

Technical Context

The AP7361EA-33SP-13 integrates a PMOS pass element, bandgap reference (0.8V), error amplifier, and foldback current limiting (400mA short-circuit clamp). Its enable input operates with VIH ≥ 1.0V and VIL ≤ 0.3V, supporting direct microcontroller GPIO control without level shifting.

Thermal shutdown activates at TJ ≈ 150°C with 20°C hysteresis, and stability is guaranteed with ≥2.2µF ceramic output capacitance across –40°C to +85°C ambient. The SO-8EP package uses an exposed thermal pad connected to GND for enhanced heat dissipation.

Key Specifications

Pinout & Package

AP7361EA-33SP-13 is housed in SO-8EP (exposed pad) package, optimized for thermal performance with θ_JA = 100°C/W and θ_JC = 28.5°C/W when mounted on FR-4 with thermal vias to ground plane.

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 TLS850F3TAV50, AP7361EA-33SP-13 uniquely delivers 1A output with EN control, 360mV dropout, and SO-8EP thermal performance-making it the only viable option for high-current, logic-controlled consumer power rails.

Availability

AP7361EA-33SP-13 is available at Aetrix Electronics and suitable for LCD TVs, set-top boxes, and smart home appliances requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7361EA-33SP-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 AP7361EA belongs to Diodes' high-performance LDO family targeting consumer and industrial power rails where low dropout, low IQ, and robust protection are mandatory-designed specifically for compact, thermally constrained PCBs in cost-sensitive mass-market devices.

FAQ

What is the minimum input voltage required for AP7361EA-33SP-13 to regulate 3.3V at 1A?

The minimum input voltage is 3.66V: 3.3V output plus 360mV typical dropout. Absolute minimum VIN per datasheet is 2.2V, but regulation fails below 3.66V under full 1A load. For reliable operation, maintain VIN ≥ 3.7V to accommodate worst-case dropout (500mV) and line tolerance.

Can AP7361EA-33SP-13 be used without connecting the EN pin?

Yes, but only if the regulator must remain permanently enabled. The EN pin has an internal 3.0MΩ pull-down resistor, so leaving it unconnected results in default OFF state. To force ON, tie EN directly to IN. Do not leave EN floating in production designs-unintended noise coupling may cause erratic enable/disable behavior.

Is the exposed pad on the SO-8EP package required to be connected to ground?

Yes-the exposed pad (Pin EP) must be soldered to a PCB copper area connected to GND. This connection provides the primary thermal path (θ_JC = 28.5°C/W) and electrical grounding. Leaving it unconnected or floating degrades thermal performance by >40%, risking thermal shutdown under 0.7A load at +60°C ambient.

Does AP7361EA-33SP-13 require an external output capacitor, and what type is recommended?

Yes-a minimum 2.2µF ceramic capacitor is required between OUT and GND for stability. X5R or X7R dielectrics are recommended; tantalum or aluminum electrolytics are not supported. Larger values (e.g., 4.7µF) improve transient response but are not mandatory. MLCC placement must be within 3mm of the OUT/GND pins to minimize parasitic inductance.