Diodes Incorporated AP7361C-25E-13

Overview

AP7361C-25E-13 from Diodes Incorporated is a 1A fixed-output (2.5V) ultra-low dropout linear regulator with enable, designed for power rail regulation in space-constrained portable and battery-powered systems. It delivers ±1% output accuracy, 360mV dropout at 1A (for 3.3V version; 2.5V variant exhibits ~250mV typical), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and current limit (1.5A).

For engineers reviewing the AP7361C-25E-13 datasheet, AP7361C-25E-13 pinout, AP7361C-25E-13 application, or AP7361C-25E-13 equivalent, key selection criteria include dropout voltage at 2.5V output, EN pin logic thresholds (VIH = 1.0V min, VIL = 0.3V max), stability with ≥2.2µF MLCC output capacitors, and thermal performance in the SO-8EP package (θJA = 100°C/W).

Technical Context

The AP7361C-25E-13 implements a PMOS pass transistor architecture enabling ultra-low dropout operation and high PSRR (75dB @ 1kHz). Its internal 0.8V bandgap reference and error amplifier regulate output via feedback to the ADJ/NC pin - unused in fixed 2.5V configuration but retained as no-connect in SO-8EP.

Enable control is implemented with active-high EN pin (VIH ≥ 1.0V, VIL ≤ 0.3V), supporting precise power sequencing. Protection functions include fold-back current limiting (triggers at ~400mA during short-circuit) and thermal shutdown activation at TJ ≈ 150°C with 20°C hysteresis, ensuring robust fault tolerance without external components.

Key Specifications

Pinout & Package

AP7361C-25E-13 is packaged in SO-8EP (exposed pad), a thermally enhanced 8-pin surface-mount package with GND-connected thermal pad for improved heat dissipation (θJA = 100°C/W). Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT, Pin 4 = NC, Pin 5 = EN, Pin 6 = NC, Pin 7 = NC, Pin 8 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2502E/TO and XC6210B252MR-G, AP7361C-25E-13 uniquely combines 1A capability, SO-8EP thermal performance (100°C/W), and guaranteed 2.5V ±1% accuracy across -40°C to +85°C - making it optimal for industrial and portable designs demanding both current headroom and precision.

Availability

AP7361C-25E-13 is available at Aetrix Electronics and suitable for portable audio devices, industrial sensor nodes, set-top box USB peripherals, and smart home hub controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AP7361C-25E-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 solutions, with manufacturing certified to IATF16949:2016 and compliance to AEC-Q100/101/200 standards.

The AP7361C belongs to Diodes' high-performance LDO family targeting battery-powered and noise-sensitive applications, emphasizing ultra-low dropout, low IQ, and integrated protection for reliable operation in compact, thermally constrained layouts.

FAQ

What is the minimum input voltage required for AP7361C-25E-13 to maintain regulation at 1A load?

The minimum input voltage is calculated as VOUT + VDROPOUT = 2.5V + 0.25V = 2.75V (typical). At worst-case conditions (e.g., high temperature, low VIN), the datasheet specifies 2.2V minimum input, but regulation at full 1A requires VIN ≥ 2.75V to guarantee 2.5V ±1% output. Below this, dropout occurs and output sags proportionally.

Can AP7361C-25E-13 be used without connecting the EN pin?

Yes - the EN pin has an internal 3.0MΩ pull-down resistor, so leaving it unconnected defaults the device to OFF. To ensure reliable startup, tie EN directly to IN (or a logic-high source ≥1.0V) using a 10kΩ series resistor for noise immunity. Do not float EN in noise-prone environments.

Is the SO-8EP package's exposed thermal pad required to be soldered to PCB ground?

Yes - the exposed pad (Pin 8) is internally connected to GND and serves as the primary thermal path. It must be soldered to a dedicated PCB copper pour tied to system ground with ≥4 thermal vias (0.3mm diameter) to an inner ground plane. Omitting this compromises θJA and risks thermal shutdown under 1A load.

Does AP7361C-25E-13 require a minimum load current for stability?

No - the device remains stable and regulated at zero load. The datasheet explicitly states "no minimum load is required." This eliminates the need for bleed resistors, reducing power waste in battery-critical applications such as remote sensors or wearables operating in extended sleep cycles.