Diodes Incorporated AP7353-31CV4-7

Overview

AP7353-31CV4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 3.1V output, ±1% accuracy, 90dB PSRR at 1kHz, 10µV_rms output noise (10Hz–100kHz), and 18µA typical quiescent current. It features enable control, thermal shutdown, and short-circuit protection, and is optimized for RF supply rails and battery-powered portable electronics requiring stable, low-noise voltage regulation.

For engineers reviewing the AP7353-31CV4-7 datasheet, AP7353-31CV4-7 pinout, AP7353-31CV4-7 application, or AP7353-31CV4-7 equivalent, key selection criteria include dropout voltage at 250mA (68mV typ. @ 3.1V), EN logic thresholds (0.4V low / 1.2V high), package thermal resistance (150°C/W for X1-WLB0707-4), and compatibility with 1µF ceramic output capacitors.

Technical Context

The AP7353-31CV4-7 employs a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its non-discharge configuration avoids automatic output discharge during shutdown, preserving downstream capacitor charge.

It operates across 2.0V–5.5V input range and delivers regulated 3.1V output with load regulation of 0.001%/mA (X1-WLB0707-4) and fast load transient response (<20µs recovery for 1mA→250mA step). The device supports stable operation with 0.7µF minimum C_OUT (X7R/X5R) and includes internal thermal shutdown triggered at +125°C junction temperature.

Key Specifications

Pinout & Package

X1-WLB0707-4 (Type A1) is a 0.7mm × 0.7mm wafer-level chip-scale package with 4 solder bumps and an exposed thermal pad (EP). Its ultra-compact footprint reduces PCB area by >60% vs. SOT-23 while enabling efficient heat dissipation via direct copper attachment to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7353-31CV4-7, AP7361-31YGC-7 trades board space and efficiency for current headroom, while MCP1703T-3102E/MB sacrifices RF noise rejection for extreme low-power operation-making the AP7353-31CV4-7 optimal for space-constrained, noise-sensitive 3.1V applications demanding balanced performance.

Availability

AP7353-31CV4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, Bluetooth LE audio devices, portable medical sensors, and Wi-Fi 6 IoT nodes requiring stable component supply with guaranteed long-term availability.

Supply support for AP7353-31CV4-7 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, with design centers across Asia, Europe, and the US and manufacturing in ISO/TS 16949-certified facilities.

The AP7353 series targets portable and wearable electronics requiring high PSRR, low noise, and minimal quiescent current in ultra-small packages-specifically addressing power integrity challenges in RF-rich, space-constrained mobile platforms.

FAQ

What is the recommended output capacitor for AP7353-31CV4-7?

A 1µF X7R or X5R ceramic capacitor placed within 2mm of the OUT and GND pins is recommended. The device remains stable with as little as 0.7µF effective capacitance, accounting for DC bias and temperature derating. ESR must be below 2Ω; low-ESR types improve load transient response in high-dynamic applications like RF transceivers.

Does AP7353-31CV4-7 include output discharge functionality?

No. AP7353-31CV4-7 is the non-discharge variant (indicated by absence of "D" in part number). When disabled via EN pin, the output remains floating and retains charge on downstream capacitors. For active discharge, select AP7353D-31CV4-7, which integrates a 35Ω NMOS discharge path between OUT and GND.

How does thermal performance differ between X1-WLB0707-4 and X2-DFN1010-4 packages?

X1-WLB0707-4 has θ_JA = 150°C/W, while X2-DFN1010-4 is rated at 237°C/W under identical JEDEC High-K board conditions. The smaller wafer-level package achieves lower thermal resistance due to shorter thermal path and superior copper-to-PCB contact via bump interconnects-critical for sustained 250mA operation in sealed enclosures.

Can AP7353-31CV4-7 operate with input voltage below 2.5V?

Yes. It supports input voltages from 2.0V to 5.5V. At VIN = 2.5V, the dropout voltage is ~71mV (typ.) for 3.1V output, meaning it can regulate until VIN drops to ~3.171V. Below that, output collapses linearly. This makes it viable for single-cell Li-ion systems operating down to 3.0V nominal, provided sufficient margin above dropout.