Diodes Incorporated AP7361EA-25E-13

Overview

AP7361EA-25E-13 from Diodes Incorporated is a 1A fixed-output (2.5V), ultra-low dropout linear regulator in SOT223 package with enable control, ±1% output accuracy, 360mV dropout at 1A (3.3V version), and 68µA quiescent current-designed for stable power delivery in LCD TV mainboards, set-top box SoC rails, and battery-powered audio subsystems.

For engineers reviewing the AP7361EA-25E-13 datasheet, AP7361EA-25E-13 pinout, AP7361EA-25E-13 application, or AP7361EA-25E-13 equivalent, key selection criteria include dropout voltage at 1A load, thermal resistance (θ_JA = 110°C/W), EN logic thresholds (V_IH = 1.0V min), foldback short-circuit current (400mA), and MLCC-compatible stability down to 2.2µF.

Technical Context

The AP7361EA-25E-13 integrates a PMOS pass transistor with internal 0.8V bandgap reference and error amplifier to regulate fixed 2.5V output. Its enable circuitry accepts TTL/CMOS-compatible logic-high input (≥1.0V) and features built-in pull-down resistor (3.0MΩ) for default-off behavior when unconnected.

Protection architecture includes foldback current limiting (1.5A trip, 400mA short-circuit clamp), thermal shutdown at +150°C with 20°C hysteresis, and stable operation with ≥2.2µF ceramic output capacitance-no minimum load required across –40°C to +85°C ambient range.

Key Specifications

Pinout & Package

AP7361EA-25E-13 uses the SOT223 package (3-pin, exposed thermal pad), with pin 1 = IN, pin 2 = GND, pin 3 = OUT. The exposed pad must be connected to PCB ground plane via thermal vias for effective heat dissipation (θ_JA = 110°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2502E/MB and XC6210B252MR-G, the AP7361EA-25E-13 uniquely combines 1A output, SOT223 thermal performance (110°C/W), integrated enable, and 68µA IQ-making it the only drop-in solution for space-constrained, thermally demanding 2.5V rails requiring active power management.

Availability

AP7361EA-25E-13 is available at Aetrix Electronics and suitable for LCD TV mainboard power, set-top box SoC core rails, and battery-powered audio amplifier biasing requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for AP7361EA-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 devices, with manufacturing certified to IATF 16949 and product definitions aligned to AEC-Q200 for automotive-grade reliability.

The AP7361EA belongs to Diodes' high-performance LDO family targeting consumer and industrial power management, designed specifically for low-dropout, low-IQ operation in space- and thermal-constrained applications such as flat-panel displays and portable media devices.

FAQ

What is the maximum allowable input voltage for AP7361EA-25E-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 device's safe operating area, especially under high ambient temperatures or heavy load, due to increased power dissipation (P_D = (V_IN – 2.5V) × I_OUT). Operation above 6.0V voids warranty and may trigger immediate thermal shutdown.

Can AP7361EA-25E-13 operate without an output capacitor?

No. A minimum 2.2µF ceramic output capacitor is mandatory for stability across –40°C to +85°C. Omitting it causes oscillation and output voltage collapse under load. The datasheet explicitly states "stable with MLCC, E-Cap, Tan-Cap, or Solid Capacitor ≥2.2µF" and shows instability in characteristic curves when C_OUT < 2.2µF.

Is the EN pin internally pulled down on AP7361EA-25E-13?

Yes. The EN pin has a built-in 3.0MΩ pull-down resistor, ensuring the regulator remains off during power-up until a valid logic-high signal (>1.0V) is applied. This eliminates the need for external pull-down components in most designs, simplifying BOM and improving startup reliability in systems with uncontrolled enable timing.

Does AP7361EA-25E-13 require a minimum load current to maintain regulation?

No. The device remains stable and fully regulated with zero load current. The datasheet confirms "no minimum load is required" and specifies that output voltage accuracy (±1%) and line/load regulation hold from 0A to 1.0A. This enables use in always-on monitoring circuits where load current varies from µA to 1A.