Diodes Incorporated AP7361EA-25Y5-13

Overview

AP7361EA-25Y5-13 from Diodes Incorporated is a 1A fixed-output (2.5V) ultra-low dropout linear regulator in SOT89-5 package, featuring 360mV dropout at 1A, ±1% output accuracy, and 68µA quiescent current. It integrates enable control, thermal shutdown, foldback current limiting, and stable operation with ≥2.2µF MLCC output capacitors - deployed in LCD TV power rails and set-top box core logic supplies.

For engineers reviewing the AP7361EA-25Y5-13 datasheet, AP7361EA-25Y5-13 pinout, AP7361EA-25Y5-13 application, or AP7361EA-25Y5-13 equivalent, key selection criteria include dropout voltage at full load, EN logic thresholds (VIH = 1.0V min), thermal resistance (θJA = 150°C/W), and compatibility with low-ESR ceramic output capacitors.

Technical Context

The AP7361EA-25Y5-13 uses a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (75dB @ 1kHz). Its internal 0.8V bandgap reference feeds an error amplifier that regulates output by adjusting gate drive to maintain VOUT = 2.5V ±1% across -40°C to +85°C ambient.

Enable functionality is implemented via a dedicated EN pin with 1.0V minimum VIH and 0.3V maximum VIL, supporting direct microcontroller GPIO control. Protection circuitry includes foldback short-circuit current limiting (400mA) and thermal shutdown activation at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

AP7361EA-25Y5-13 is packaged in SOT89-5: a thermally enhanced 5-pin surface-mount package with exposed tab for improved heat dissipation. Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT, Pin 4 = EN, Pin 5 = GND (dual ground pins improve thermal and EMI performance).

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 TLS850F2BTV50, the AP7361EA-25Y5-13 uniquely balances 1A output, 360mV dropout, and 68µA IQ in a cost-optimized SOT89-5 package - making it optimal for high-current consumer electronics where automotive qualification and ultra-low IQ are not required.

Availability

AP7361EA-25Y5-13 is available at Aetrix Electronics and suitable for LCD TV power management, set-top box core logic, portable audio DAC supplies, and home appliance MCU rails requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for AP7361EA-25Y5-13 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 for power management, signal integrity, and connectivity applications.

The AP7361EA belongs to Diodes' high-performance LDO regulator product line, engineered for low-dropout, low-quiescent-current operation in space-constrained consumer and industrial electronics.

FAQ

What is the minimum input voltage required for stable 2.5V output at 1A?

The AP7361EA-25Y5-13 requires VIN ≥ 2.85V to maintain regulation at 1A load, based on its typical 360mV dropout voltage (2.5V + 0.36V). Absolute minimum input is 2.2V per datasheet, but below 2.85V, output will droop under full load. Input must also stay within absolute max rating of 6.5V.

Can the EN pin be left floating, or must it be tied high?

The EN pin must never be left floating: it has an internal 3.0MΩ pull-down resistor, but undefined logic states may cause erratic turn-on behavior. For guaranteed operation, tie EN directly to IN (for always-on) or drive it actively with a GPIO meeting VIH ≥1.0V and VIL ≤0.3V specifications.

Is the SOT89-5 package thermally adequate for 1A continuous operation?

Yes, when mounted per datasheet layout guidelines: use ≥1cm² copper pour connected to both GND pins and thermal vias to inner/ground layers. With θJA = 150°C/W and 2.5V@1A (2.5W dissipation), junction rise is ~375°C above ambient - so derating to ≤600mA is recommended for sustained operation at +85°C ambient unless heatsinking is enhanced.

Does AP7361EA-25Y5-13 require an external resistor divider for 2.5V output?

No - the "25" suffix indicates factory-trimmed fixed 2.5V output. The ADJ pin is internally connected and unused in this variant; external resistors are only required for adjustable versions (e.g., AP7361EA-ADJ). For fixed versions, ADJ pin should be left unconnected or grounded per design preference - no impact on regulation.