Diodes Incorporated AP7354D-25W5-7

Overview

AP7354D-25W5-7 from Diodes Incorporated is a 2.5V fixed-output, 150mA ultra-low quiescent current LDO regulator in SOT25 package with integrated enable input and active output discharge. It delivers ±1% output voltage accuracy over -40°C to +85°C, supports 2.0V–5.5V input range, and draws only 0.25µA quiescent current-enabling multi-year battery life in compact wearable sensors and IoT edge nodes.

For engineers reviewing the AP7354D-25W5-7 datasheet, AP7354D-25W5-7 pinout, AP7354D-25W5-7 application, or AP7354D-25W5-7 equivalent, key selection criteria include its 0.22V dropout at 150mA (2.5V output), 0.02µA standby current with EN low, and guaranteed discharge path for rapid VOUT decay during shutdown-critical for power sequencing in battery-constrained systems.

Technical Context

The AP7354D-25W5-7 integrates a precision voltage reference, error amplifier, current-limit protection, and enable-controlled pass transistor. Its internal resistor network fixes VOUT at 2.5V, eliminating external feedback components while maintaining ±1% accuracy across temperature and load.

Unlike standard LDOs, this variant includes an active output discharge circuit (enabled when EN = low), pulling VOUT to GND through a 35Ω internal FET-ensuring fast, controlled discharge without external circuitry. The SOT25 package provides thermal resistance of 162°C/W (Junction-to-Ambient), supporting continuous 150mA operation within ambient limits.

Key Specifications

Pinout & Package

SOT25 package: 5-pin surface-mount plastic package with exposed pad (not electrically connected); dimensions 2.80mm × 2.90mm × 1.10mm; thermal resistance θ_JA = 162°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-2502E/TO and XC6206P252MR-G, the AP7354D-25W5-7 uniquely combines ultra-low 0.25µA quiescent current, integrated enable, and active output discharge in a compact SOT25 package-making it optimal for space- and energy-constrained battery-powered designs requiring controlled power sequencing.

Availability

AP7354D-25W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor modules, and wireless communication devices requiring stable component supply with long-term lifecycle support.

Supply support for AP7354D-25W5-7 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 high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.

The AP7354 series belongs to Diodes' ultra-low-IQ LDO portfolio, engineered specifically for extended battery life in portable and energy-harvesting applications-emphasizing sub-µA quiescent operation, precision output regulation, and integrated system-level features like enable and discharge.

FAQ

What is the minimum input voltage required for AP7354D-25W5-7 to maintain regulated 2.5V output at 150mA?

The dropout voltage is 0.22V at 150mA and +25°C, so minimum VIN = 2.5V + 0.22V = 2.72V. At full temperature range (-40°C to +85°C), worst-case dropout is 0.48V, requiring VIN ≥ 2.98V for guaranteed regulation at 150mA. Derating is recommended for margin in production designs.

Can the EN pin be left unconnected if enable functionality is not needed?

No-EN must not be left floating. If unused, tie EN directly to VIN to ensure permanent enable. Floating EN may cause erratic startup/shutdown behavior due to noise susceptibility, as the threshold is only 0.4V (low) and 1.0V (high), with no internal pull-up/down.

Does AP7354D-25W5-7 require external capacitors, and what type is recommended?

Yes: 0.1µF X5R/X7R ceramic capacitors are required on both VIN and VOUT, placed as close as possible to their respective pins. These minimize impedance, ensure stability, and improve transient response. Bulk capacitance may be added for high-pulse-current loads, but the LDO is optimized for small ceramic caps only.

How does the output discharge function operate, and what is its impact on system design?

When EN is pulled low, an internal 35Ω FET connects VOUT to GND, discharging external capacitance. For a 1µF load, VOUT falls from 2.5V to 0.1V in ~35µs. This eliminates need for external discharge resistors, simplifies layout, and prevents back-powering of upstream circuitry during power-down sequences.