Diodes Incorporated AP7361C-25ER-13

Overview

AP7361C-25ER-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 dropout is 200–250mV), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and current limiting (1.5A). It operates across –40°C to +85°C ambient and supports MLCC, tantalum, or solid capacitors ≥2.2µF.

For engineers reviewing the AP7361C-25ER-13 datasheet, AP7361C-25ER-13 pinout, AP7361C-25ER-13 application, or AP7361C-25ER-13 equivalent, key selection considerations include dropout voltage at 2.5V output, EN pin logic thresholds (VIH = 1.0V min), thermal resistance of SOT223R package (θJA = 110°C/W), and compatibility with low-ESR ceramic output capacitors.

Technical Context

The AP7361C-25ER-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-fixed versions bypass ADJ, while adjustable variants use external resistor dividers.

Enable control is active-high with integrated 3.0MΩ pull-down resistor; EN pin leakage is ±0.1µA. Protection circuitry includes fold-back current limiting (400mA short-circuit clamp), thermal shutdown at ~150°C with 20°C hysteresis, and input overvoltage tolerance up to 6.5V.

Key Specifications

Pinout & Package

AP7361C-25ER-13 is supplied in the SOT223R package: 4-pin variant with pin 1 = GND, pin 2 = OUT, pin 3 = IN, and pin 4 = EN. The exposed thermal pad (pin 4 not electrically connected) enhances thermal performance; θJA = 110°C/W under standard FR-4 layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2502E/TO and TLS850B2L1V50, AP7361C-25ER-13 uniquely balances 1A output, 60µA IQ, EN control, and industrial temperature range in a thermally enhanced SOT223R package - making it optimal for non-automotive portable and industrial embedded systems needing headroom and flexibility.

Availability

AP7361C-25ER-13 is available at Aetrix Electronics and suitable for portable audio devices, industrial sensor nodes, LCD display bias rails, and USB-C peripheral power requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AP7361C-25ER-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 AP7361C belongs to Diodes' high-performance LDO family targeting low-dropout, low-IQ regulation in battery-powered and space-constrained applications - emphasizing thermal robustness, wide VIN range, and compatibility with modern ceramic capacitors.

FAQ

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

The minimum input voltage is determined by dropout: for 2.5V output, typical dropout is 200–250mV at 1A. Thus, VIN(min) = 2.5V + 0.25V = 2.75V. Operation below 2.75V results in unregulated output; the absolute minimum VIN rating is 2.2V, but regulation cannot be guaranteed below 2.75V at full load.

Can AP7361C-25ER-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 always-on operation, tie EN directly to the IN pin. Do not leave EN floating in noise-prone environments, as leakage or coupling could cause erratic enable behavior.

Is the SOT223R package thermally superior to standard SOT223 for AP7361C-25ER-13?

Yes - SOT223R reassigns pinout (GND/OUT/IN/EN) and features an optimized thermal pad layout. While both share the same θJA = 110°C/W rating per datasheet, SOT223R's pin 1 GND placement improves ground loop efficiency and reduces thermal resistance in multi-layer PCBs with dedicated ground planes.

Does AP7361C-25ER-13 require a minimum load current to maintain stability?

No - the device remains stable and regulated with zero load current. Unlike older LDOs, AP7361C-25ER-13 uses advanced internal compensation and does not require a minimum load or ESR-based damping. Stability is ensured with ≥2.2µF ceramic output capacitance regardless of load condition.