Diodes Incorporated AP7361-25D-13

Overview

AP7361-25D-13 from Diodes Incorporated is a 1A fixed-output (2.5V) ultra-low dropout linear regulator in TO252 package with enable control, 70µA quiescent current, and 500mV dropout at full load-designed for FPGA I/O power, laptop subsystems, and battery-powered audio devices.

For engineers reviewing the AP7361-25D-13 datasheet, AP7361-25D-13 pinout, AP7361-25D-13 application, or AP7361-25D-13 equivalent, key selection criteria include dropout voltage at 1A, thermal shutdown threshold (150°C), PSRR (65dB @1kHz), stability with ≥2.2µF ceramic output capacitor, and EN pin logic thresholds (VIH = 1.0V, VIL = 0.3V).

Technical Context

The AP7361-25D-13 integrates a PMOS pass element, band-gap reference (0.8V), error amplifier, and thermal shutdown circuitry. Its fixed 2.5V output is internally trimmed, eliminating external feedback resistors-unlike adjustable variants that require ADJ pin resistor dividers.

It operates across 2.2V–6.0V input range with built-in current limiting (1.1–1.5A) and short-circuit protection (200mA clamp). The TO252 package provides 95°C/W junction-to-ambient thermal resistance and supports up to 1.25W power dissipation at +25°C ambient.

Key Specifications

Pinout & Package

AP7361-25D-13 uses the TO252 (DPAK) surface-mount package with exposed thermal pad, offering 95°C/W θJA and 1.25W max power dissipation at +25°C ambient. Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703-2502E/TO and XC6210B252MR-G, AP7361-25D-13 uniquely balances 1A drive, 500mV dropout at full load, 70µA IQ, and active-high EN-making it optimal for mid-power embedded systems needing both performance and controllability.

Availability

AP7361-25D-13 is available at Aetrix Electronics and suitable for FPGA power delivery, laptop subsystem regulation, and battery-powered audio applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for AP7361-25D-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, with emphasis on power management, signal integrity, and protection devices for industrial, computing, and consumer markets.

The AP7361 belongs to Diodes' high-performance LDO regulator product line, engineered for low-noise, high-current applications where dropout voltage, PSRR, and thermal robustness are critical-particularly in space-constrained portable and embedded systems.

FAQ

What is the minimum input voltage required for AP7361-25D-13 to regulate 2.5V output?

The absolute minimum input voltage is 2.2V per datasheet specifications. However, to maintain regulation under 1A load, VIN must exceed 3.0V due to the 500mV dropout voltage. At light loads (<100mA), regulation is sustained down to VIN = 2.7V. Input below 2.2V risks device malfunction or shutdown.

Can AP7361-25D-13 be used with a 1µF output capacitor?

No. The datasheet mandates ≥2.2µF ceramic output capacitance with 10–300mΩ ESR for guaranteed stability and transient response. Using 1µF risks oscillation, overshoot, or failure to recover from load steps-especially at 1A transitions. A 4.7µF X5R 0805 capacitor is the recommended minimum.

Is the EN pin internally pulled up or does it require an external pull-up?

The EN pin has no internal pull-up; it is a high-impedance CMOS input. To ensure reliable turn-on, it must be actively driven to ≥1.0V (VIH min) or tied directly to the IN pin. Leaving EN floating may cause erratic startup or unintended shutdown due to noise coupling.

Does AP7361-25D-13 support reverse polarity protection?

No. The device lacks integrated reverse-voltage protection. Applying reversed input voltage (e.g., IN < GND) can damage the internal pass transistor and band-gap reference. An external series Schottky diode or ideal diode controller is required if reverse polarity exposure is possible in the application.