Diodes Incorporated AP7361-25ER-13

Overview

AP7361-25ER-13 from Diodes Incorporated is a 1A fixed-output (2.5V) ultra-low dropout linear regulator in SOT223R package with enable control, 70µA quiescent current, and 500mV dropout at full load-designed for FPGA I/O power, battery-powered audio devices, and laptop subsystems requiring stable low-noise voltage regulation.

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

Technical Context

The AP7361-25ER-13 integrates a PMOS pass element, band-gap reference (0.8V), error amplifier, and thermal shutdown circuitry. Its fixed 2.5V output is internally set via resistor divider; no external ADJ pin is used in this variant.

It operates across 2.2V–6.0V input range with active-high enable control and delivers regulated output without minimum load requirement. Current limit (1.1–1.5A) and short-circuit protection (200mA clamp) operate independently of EN state.

Key Specifications

Pinout & Package

SOT223R package: exposed thermal pad on bottom, 3-pin configuration with GND (Pin 1), OUT (Pin 2), IN (Pin 3); pin 1 is ground reference for thermal path and electrical return.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2502E/MB and XC6210B252MR-G, the AP7361-25ER-13 uniquely balances 1A delivery, 500mV dropout, 70µA IQ, and active-high EN in SOT223R - making it optimal for space-constrained, battery-sensitive 2.5V rails where both performance and control are required.

Availability

AP7361-25ER-13 is available at Aetrix Electronics and suitable for FPGA power, portable audio systems, industrial sensor nodes, and laptop subsystems requiring stable component supply with full traceability and long-term lifecycle assurance.

Supply support for AP7361-25ER-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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.

The AP7361 belongs to Diodes' high-performance LDO family targeting portable, industrial, and computing applications where low dropout, low IQ, and robust protection are mandatory design requirements.

FAQ

What is the minimum input voltage required for AP7361-25ER-13 to maintain regulation at 1A load?

The device requires VIN ≥ 3.0V to sustain 2.5V output at 1A, based on its 500mV dropout specification. Below 3.0V, output voltage drops linearly; operation below 2.2V absolute minimum input risks functional failure per Absolute Maximum Ratings.

Can AP7361-25ER-13 be used without an enable signal?

Yes - tie the EN pin directly to IN to force permanent ON state. This configuration is valid and commonly used in fixed-rail applications where sequencing is not required; the EN pin draws only 0.1µA leakage in this condition.

Is a heatsink required for AP7361-25ER-13 operating at 1A with VIN = 5V?

At VIN = 5V and IOUT = 1A, power dissipation is 2.5W. With θJA = 110°C/W for SOT223R, junction rise would exceed 275°C - far above 150°C limit. A minimum 250mm² copper pour with 4 thermal vias is mandatory; external heatsink is strongly advised for sustained 1A operation.

Does AP7361-25ER-13 require a minimum load current for stability?

No - the device remains stable and regulated down to zero load current, as confirmed in the Application Information section. No pull-down resistor or dummy load is needed, simplifying design for intermittent-use battery systems.