Diodes Incorporated AP7353D-32CV4-7

Overview

AP7353D-32CV4-7 from Diodes Incorporated is a 3.2V fixed-output, 250mA low-dropout linear regulator with high PSRR (90dB @ 1kHz), ultra-low output noise (10µV_rms), ±1% output voltage accuracy, and 18µA typical quiescent current. Packaged in the X1-WLB0707-4 (Type A1) wafer-level chip-scale package, it delivers stable power to noise-sensitive RF and portable imaging circuits where compact footprint and fast transient response are critical.

For engineers reviewing the AP7353D-32CV4-7 datasheet, AP7353D-32CV4-7 pinout, AP7353D-32CV4-7 application, or AP7353D-32CV4-7 equivalent, key selection criteria include dropout voltage at 250mA (max 142mV), enable threshold compatibility (EN high ≥1.2V), thermal resistance (θ_JA = 150°C/W), and discharge functionality for rapid output discharge during shutdown.

Technical Context

The AP7353D integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown protection. Its built-in auto-discharge function uses a 35Ω N-channel MOSFET between OUT and GND when EN is low, ensuring rapid V_OUT decay-critical for sequencing in multi-rail systems.

It operates across 2.0V–5.5V input range and maintains regulation down to 115mV dropout at 250mA for V_OUT = 1.8V (Type A1). Line regulation is 0.02%/V and load regulation is 0.001%/mA, enabling stable operation under dynamic load steps up to 250mA with <180µs turn-on time.

Key Specifications

Pinout & Package

Packaged in the X1-WLB0707-4 (Type A1) wafer-level chip-scale package (0.7mm × 0.7mm, 0.395mm height), this 4-bump device uses a bottom-side interconnect layout optimized for minimal PCB area and thermal resistance (θ_JA = 150°C/W on JEDEC High-K board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3202E/MB and XC6210B322MR-G, AP7353D-32CV4-7 uniquely combines discharge functionality, ultra-low noise, and wafer-level packaging in a 0.7mm² footprint-making it optimal for space-constrained, multi-rail portable systems requiring controlled power sequencing and RF-grade cleanliness.

Availability

AP7353D-32CV4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, wearable biosensors, and Wi-Fi 6E RF transceivers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for AP7353D-32CV4-7 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 high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7353 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-critical portable electronics where battery efficiency, small form factor, and rapid load transient response are essential.

FAQ

What is the purpose of the exposed pad (EP) on AP7353D-32CV4-7?

The exposed pad is a thermal interface-not an electrical terminal-and must be soldered to a large copper area connected to GND for optimal heat dissipation. It reduces junction-to-ambient thermal resistance by ~30% compared to floating pad layouts, enabling sustained 250mA operation at +85°C ambient without derating.

Does AP7353D-32CV4-7 require an external discharge resistor?

No. The "D" suffix denotes integrated auto-discharge functionality: a 35Ω N-channel MOSFET connects OUT to GND when EN is low, pulling the output voltage to near-zero within microseconds. This eliminates the need for external resistors, saving board space and reducing BOM count.

Can AP7353D-32CV4-7 operate with a 1µF output capacitor?

Yes. The device is stable with ≥1µF X7R/X5R ceramic capacitors (ESR < 2Ω). A 1µF capacitor meets minimum stability requirements and provides adequate transient response for loads stepping up to 250mA; placing it within 2mm of OUT and GND pins is mandatory for optimal performance.

How does the enable pin behave under floating conditions?

The EN pin must never be left floating-it has no internal pull-up/down. A floating EN may cause erratic startup/shutdown behavior or increased standby current. For always-on operation, tie EN directly to IN; for controlled enable, drive it with a clean 1.2V–5.5V logic signal meeting specified VIH/VIL thresholds.