Diodes Incorporated AP7354D-18FS4-7

Overview

AP7354D-18FS4-7 from Diodes Incorporated is a 1.8V fixed-output, 150mA ultra-low quiescent current LDO regulator in X2-DFN1010-4 (Type B) package with integrated active output discharge, ±1% output voltage accuracy over temperature, and 0.25µA typical quiescent current-designed for power management in compact, battery-constrained wearable sensors and IoT edge nodes.

For engineers reviewing the AP7354D-18FS4-7 datasheet, AP7354D-18FS4-7 pinout, AP7354D-18FS4-7 application, or AP7354D-18FS4-7 equivalent, key selection criteria include dropout voltage at 150mA (0.33V typ), EN pin logic thresholds (0.4V low / 1.0V high), thermal resistance (295°C/W J-A), and compatibility with 0.1µF ceramic input/output capacitors.

Technical Context

The AP7354D-18FS4-7 implements a precision bandgap reference, error amplifier, and current-limit protection in a monolithic CMOS architecture. Its enable-controlled shutdown reduces standby current to 0.02µA, while the built-in active discharge path (35Ω typical) rapidly collapses VOUT when disabled-critical for multi-rail sequencing in low-power microcontroller subsystems.

This variant supports 2.0V–5.5V input range and delivers stable 1.8V output across –40°C to +85°C ambient, with load regulation of ±40mV (1–150mA) and line regulation of 0.02%/V. The X2-DFN1010-4 (Type B) package enables sub-1mm² PCB footprint without compromising thermal performance under pulsed loads.

Key Specifications

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm body, 0.65mm pitch, NiPdAu-plated copper terminals, moisture sensitivity level 1, RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1802E/TT and XC6210B182MR-G, the AP7354D-18FS4-7 uniquely combines sub-µA quiescent current, 150mA output, active discharge, and 1.0mm² footprint-making it optimal for space- and energy-constrained wireless sensor designs where rail collapse timing and battery longevity are critical.

Availability

AP7354D-18FS4-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor modules, and battery-operated imaging devices requiring stable component supply with guaranteed long-term availability.

Supply support for AP7354D-18FS4-7 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 portable electronics, delivering high-accuracy, low-noise regulation with minimal board area-optimized for applications where battery life and miniaturization are primary design constraints.

FAQ

What is the minimum input voltage required for AP7354D-18FS4-7 to maintain regulation at 150mA load?

The minimum input voltage is calculated as V_OUT + V_DROP = 1.8V + 0.33V = 2.13V (typical). At worst-case 0.70V dropout (per datasheet Table 2), VIN must be ≥2.5V to sustain 150mA output across temperature and process variation. Below this, output voltage droops nonlinearly.

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

No-EN must not float. For permanent enable, tie EN directly to VIN using a short trace. Floating EN causes unpredictable startup behavior and may increase quiescent current due to internal leakage paths. A pull-up resistor to VIN is acceptable but adds unnecessary current draw.

Is the X2-DFN1010-4 (Type B) package compatible with standard reflow profiles?

Yes-the device is rated for MSL Level 1 and supports JEDEC J-STD-020 Rev E lead-free reflow. Peak temperature must not exceed 260°C for ≤60 seconds, with ramp rates ≤3°C/s. The NiPdAu finish ensures solderability without oxidation concerns during preheat and soak phases.

Does the active discharge feature affect stability or noise performance during normal operation?

No-the discharge FET is fully isolated from the regulation loop and only activates when EN is low. During active regulation, the discharge path remains open-circuit; all AC performance metrics (PSRR, noise, transient response) match the non-discharge AP7354-18FS4-7 variant per datasheet Figures 7–10.