Diodes Incorporated AP7361-15E-13

Overview

AP7361-15E-13 from Diodes Incorporated is a 1A fixed-output (1.5V) ultra-low dropout linear regulator in SOT223 package with enable control, 70µA typical quiescent current, 500mV dropout at 1A load, and thermal shutdown protection. It delivers stable core power to FPGA I/O rails and portable audio subsystems requiring low-noise, fast transient response, and ceramic capacitor compatibility.

For engineers reviewing the AP7361-15E-13 datasheet, AP7361-15E-13 pinout, AP7361-15E-13 application, or AP7361-15E-13 equivalent, key selection criteria include dropout voltage at full load, EN pin logic thresholds, thermal resistance (θ_JA = 110°C/W), output accuracy (±2% over temperature), and stability with ≥2.2µF ceramic output capacitance.

Technical Context

The AP7361-15E-13 implements a PMOS pass transistor architecture enabling ultra-low dropout (500mV @ 1A) and high PSRR (65dB @ 1kHz). Its internal 0.8V bandgap reference feeds an error amplifier controlling gate drive to maintain regulation across input voltages from 2.2V to 6.0V.

Enable functionality is implemented via a dedicated EN pin (VIH = 1.0V, VIL = 0.3V) with ±0.1µA leakage; thermal shutdown activates at 150°C with 20°C hysteresis. Current limiting triggers at 1.1–1.5A, and short-circuit protection clamps output to ~200mA when V_OUT falls below 15% of nominal.

Key Specifications

Pinout & Package

SOT223 package (3-pin variant, pin 1: IN, pin 2: GND, pin 3: OUT) with exposed thermal pad on bottom surface; θ_JA = 110°C/W on standard FR-4 layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-1502E/MB and XC6209F152MR-G, the AP7361-15E-13 uniquely balances 1A capability, 500mV dropout, integrated enable, and full protection-making it the sole fit for thermally constrained, medium-power FPGA and audio applications requiring robustness and fast response.

Availability

AP7361-15E-13 is available at Aetrix Electronics and suitable for FPGA I/O power, portable audio subsystems, laptop embedded controller rails, and industrial sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP7361-15E-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 for low-noise, high-current power delivery in portable, computing, and industrial systems where dropout, PSRR, and thermal resilience are critical.

FAQ

What is the minimum input voltage required for AP7361-15E-13 to regulate 1.5V output at 1A?

The minimum input voltage is 2.0V, calculated as V_OUT + V_DROPOUT = 1.5V + 0.5V. The datasheet specifies 500mV dropout at 1A load, and absolute minimum VIN is rated at 2.2V-so 2.0V is the practical lower bound for regulation, though operation below 2.2V violates absolute maximum ratings and is not recommended.

Can AP7361-15E-13 be used without an enable signal?

Yes. The EN pin is not present in the SOT223 package variant (AP7361-15E-13 uses SOT223, which has only IN/GND/OUT pins per datasheet Pin Assignments table). This part is always enabled; enable functionality is only available in U-DFN3030-8, SOT89-5, and SO-8EP packages.

Is a minimum load required for stability with AP7361-15E-13?

No minimum load is required. The datasheet explicitly states "no minimum load is required to keep the device stable" and confirms stable operation under no-load conditions. This simplifies design for intermittent-use circuits like sensor wake-up paths or standby logic rails.

What thermal considerations apply when using AP7361-15E-13 at 1A in SOT223 package?

With θ_JA = 110°C/W, power dissipation at 1A with 1V input margin (P_D = 1W) raises junction temperature by 110°C above ambient. At 25°C ambient, T_J reaches 135°C-within safe limits-but at 60°C ambient, T_J hits 170°C, triggering thermal shutdown. Adequate copper pour and thermal vias under the exposed pad are mandatory for 1A operation.