Diodes Incorporated AP7354-185FS4-7

Overview

AP7354-185FS4-7 from Diodes Incorporated is a fixed 1.85V, 150mA ultra-low quiescent current LDO regulator in X2-DFN1010-4 (Type B) package, featuring ±1% output voltage accuracy over temperature, 0.25µA typical quiescent current, and integrated enable control. It delivers stable power to low-power sensor modules and wearable electronics where battery life extension is critical.

For engineers reviewing the AP7354-185FS4-7 datasheet, AP7354-185FS4-7 pinout, AP7354-185FS4-7 application, or AP7354-185FS4-7 equivalent, key selection considerations include dropout voltage at 150mA (0.32V typ), EN logic thresholds (0.4V low / 1.0V high), output discharge capability (enabled in this variant), thermal resistance (295°C/W), and compatibility with 0.1µF ceramic input/output capacitors.

Technical Context

The AP7354-185FS4-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and active output discharge path-enabling fast VOUT ramp-down during shutdown. Its internal resistor network fixes the output at 1.85V without external feedback components.

It operates across 2.0V–5.5V input range with guaranteed 150mA output, maintains ±1% accuracy at +25°C (±2% over –40°C to +85°C), and achieves 0.02µA standby current when EN is low-making it suitable for intermittent-sensing IoT nodes requiring microamp-level system sleep current.

Key Specifications

Pinout & Package

X2-DFN1010-4 (Type B) is a 1.0mm × 1.0mm, 0.39mm height, 4-terminal leadless package with exposed thermal pad (no electrical connection). It offers superior thermal performance vs. SOT23/SOT25 and is optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1802E/TO and XC6219B185MR-G, the AP7354-185FS4-7 uniquely combines ultra-low 0.25µA IQ, integrated EN, and active output discharge in a 1.0mm² DFN-delivering optimal power efficiency and system-level control in miniaturized battery-operated designs.

Availability

AP7354-185FS4-7 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 assurance.

Supply support for AP7354-185FS4-7 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 consumer, industrial, and automotive markets.

The AP7354 series targets ultra-low-power battery-operated applications-designed specifically to extend runtime in wearables, sensor nodes, and portable medical devices through sub-microamp quiescent current and compact packaging.

FAQ

What is the maximum input voltage for AP7354-185FS4-7?

The absolute maximum input voltage is 6.0V per the datasheet. For reliable operation, VIN must stay within 2.0V–5.5V under recommended conditions. Exceeding 5.5V risks permanent damage, especially during transient events-even if duration is brief.

Does AP7354-185FS4-7 require an external pull-up on the EN pin?

No external pull-up is required. The EN pin has no internal pull-up; it must be actively driven high (≥1.0V) to enable regulation or low (≤0.4V) to enter shutdown. Leaving EN floating will result in undefined output behavior and potential malfunction.

Can AP7354-185FS4-7 be used with ceramic capacitors smaller than 0.1µF?

The device is characterized and guaranteed stable with 0.1µF X5R/X7R ceramics. Using smaller values (e.g., 10nF) may compromise transient response and phase margin-especially under load steps-so 0.1µF remains the minimum validated value for production designs.

Is the center pad on the X2-DFN1010-4 package electrically connected?

No-the center pad is a thermal pad only, with no electrical connection. It must be soldered to a PCB thermal pad for heat dissipation but must not be tied to any signal or power net. Electrical grounding must occur exclusively through Pin 2 (GND).