Diodes Incorporated AP7353D-30FS4-7

Overview

AP7353D-30FS4-7 from Diodes Incorporated is a 3.0V fixed-output, 250mA low-dropout linear regulator with high PSRR (90dB @ 1kHz), ultra-low output noise (10µV_rms), and 18µA typical quiescent current. Packaged in the X2-DFN1010-4 (Type B) 1.0mm × 1.0mm footprint, it delivers ±1% output accuracy and fast load transient response for RF power supply rails in space-constrained portable electronics.

For engineers reviewing the AP7353D-30FS4-7 datasheet, AP7353D-30FS4-7 pinout, AP7353D-30FS4-7 application, or AP7353D-30FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (max 150mV), enable threshold compatibility (EN high ≥1.2V), thermal resistance (θ_JA = 237°C/W), and discharge functionality for rapid V_OUT decay during shutdown.

Technical Context

The AP7353D integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and internal N-channel discharge FET activated when EN = 0V. Its architecture enables stable regulation across 2.0V–5.5V input while maintaining <0.004%/mA load regulation and 0.02%/V line regulation.

Unlike non-discharge variants (AP7353), the "D" suffix denotes integrated auto-discharge capability (R_ON ≈ 35Ω), ensuring V_OUT decays rapidly after disable-critical for sequencing-sensitive systems like multi-rail SoCs and camera modules requiring controlled power-down timing.

Key Specifications

Pinout & Package

Packaged in X2-DFN1010-4 (Type B), a 1.0mm × 1.0mm, 0.4mm pitch, 4-terminal leadless package with exposed thermal pad (EP). Optimized for high-density PCB layouts and thermal performance via EP-to-GND copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3002E/MB and XC6210B302MR-G, AP7353D-30FS4-7 uniquely combines 250mA output, 90dB PSRR, 10µV_rms noise, and integrated discharge in a 1.0mm × 1.0mm footprint-making it optimal for miniaturized, multi-rail, noise-sensitive wireless devices.

Availability

AP7353D-30FS4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, wireless audio codecs, wearable biosensors, and Wi-Fi 6 RF front-ends requiring stable component supply, tight voltage tolerance, and rapid power sequencing.

Supply support for AP7353D-30FS4-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7353 series targets portable and wearable electronics requiring ultra-low-noise, high-PSRR, and space-efficient power regulation-designed specifically for RF, imaging, and battery-constrained subsystems.

FAQ

What is the maximum allowable input voltage for AP7353D-30FS4-7?

The absolute maximum input voltage is 6.0V per the datasheet's Absolute Maximum Ratings table. Continuous operation above 5.5V violates recommended conditions and risks permanent damage. For reliable long-term use, VIN must remain within 2.0V–5.5V, with sufficient margin above dropout (e.g., ≥3.15V for 3.0V output at 250mA).

Does AP7353D-30FS4-7 require an external discharge resistor?

No. The "D" suffix indicates integrated auto-discharge functionality via an internal 35Ω N-channel FET. When EN is pulled low, this FET actively discharges the output capacitor, eliminating the need for an external bleed resistor and reducing BOM count and PCB area.

Can AP7353D-30FS4-7 operate with a 1µF ceramic output capacitor?

Yes. The device is explicitly characterized and guaranteed stable with a 1µF X7R/X5R ceramic capacitor (ESR < 2Ω). This value meets both minimum effective capacitance (0.7µF accounting for bias/temperature drift) and transient response requirements for loads up to 250mA.

How does the exposed pad (EP) affect thermal performance?

The EP is a thermal-only pad with no electrical function. Soldering it to a ≥25mm² GND copper pour reduces θ_JA from ~300°C/W (no EP connection) to the rated 237°C/W, enabling full 250mA output at +85°C ambient without thermal shutdown.