Diodes Incorporated AP7354-18W5-7

Overview

AP7354-18W5-7 from Diodes Incorporated is a 1.8V fixed-output, 150mA ultra-low quiescent current LDO regulator in SOT25 package, featuring ±1% output accuracy, 0.25µA quiescent current, and enable-controlled shutdown - designed for power management in battery-constrained wearable sensors and IoT edge nodes.

For engineers reviewing the AP7354-18W5-7 datasheet, AP7354-18W5-7 pinout, AP7354-18W5-7 application, or AP7354-18W5-7 equivalent, key selection criteria include dropout voltage at 150mA (0.33V typ), EN logic thresholds (0.4V low / 1.0V high), thermal resistance (162°C/W), and compatibility with 0.1µF ceramic input/output capacitors.

Technical Context

The AP7354-18W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and active enable input to deliver stable 1.8V regulation across 2.0V–5.5V input range. Its internal resistor network fixes output voltage without external feedback components.

It operates in two functional states: enabled (EN ≥ 1.0V) delivers regulated 1.8V output with <40mV load regulation up to 150mA; disabled (EN ≤ 0.4V) reduces standby current to 0.02µA and disables output - critical for intermittent-sensing applications requiring microamp-level system sleep currents.

Key Specifications

Pinout & Package

SOT25 package (3.0mm × 2.8mm × 1.3mm), surface-mount, lead-free, RoHS-compliant with tin-plated leads solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1802E/TO and XC6206P182MR-G, the AP7354-18W5-7 uniquely combines sub-µA quiescent current, integrated enable, and SOT25 thermal performance - making it optimal for battery-limited, intermittently active edge devices demanding both longevity and precise power control.

Availability

AP7354-18W5-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor modules, and wireless communication devices requiring stable component supply with long-term manufacturability and lifecycle continuity.

Supply support for AP7354-18W5-7 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 power management, signal integrity, and protection solutions for high-volume industrial and consumer markets.

The AP7354 series belongs to Diodes' ultra-low-I_Q LDO product line, engineered specifically for extended-battery-life applications in wearables, medical patches, and energy-harvesting sensor nodes.

FAQ

What is the minimum input voltage required for stable 1.8V output at 150mA?

The AP7354-18W5-7 requires VIN ≥ 2.13V to maintain regulation at 150mA, based on its typical 0.33V dropout voltage. At lower inputs, output collapses linearly - e.g., at VIN = 2.0V, VOUT drops to ~1.67V. Operation below 2.0V violates absolute maximum ratings and risks instability.

Can the EN pin be left unconnected if always-on operation is desired?

No - the EN pin must never float. For always-on use, tie EN directly to VIN. Floating EN causes undefined behavior due to internal leakage paths, potentially resulting in erratic enable/disable cycling or elevated quiescent current. A pull-up resistor to VIN is acceptable but adds unnecessary leakage.

Is output discharge functionality included in AP7354-18W5-7?

No - AP7354-18W5-7 is the non-discharge variant. It lacks the internal discharge FET between VOUT and GND. If rapid VOUT discharge during shutdown is required (e.g., to meet system reset timing), select AP7354D-18W5-7, which adds a 35Ω typical discharge path activated when EN is low.

What capacitor types are recommended for CIN and COUT?

X5R or X7R ceramic capacitors rated ≥6.3V with 0.1µF value are explicitly recommended. These dielectrics maintain stable capacitance and low ESR across -40°C to +85°C, ensuring loop stability and transient response. Avoid Y5V or Z5U types due to severe capacitance loss at temperature extremes and DC bias.