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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP7353D-32FS4-7

Name: AP7353D-32FS4-7
Brand: Diodes Incorporated
SKU: AP7353D-32FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7353D-32FS4-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7353D-32FS4-7.pdf

Description:: LDO CMOS LOWCURR X2-DFN1010-4 (T

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7353D-32FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 3.2V output, high PSRR (90dB @ 1kHz), ultra-low output noise (10µV_rms), and 18µA typical quiescent current. Packaged in X2-DFN1010-4 (Type B), it delivers stable voltage regulation for RF power supplies and portable media subsystems where noise sensitivity and battery life are critical.

For engineers reviewing the AP7353D-32FS4-7 datasheet, AP7353D-32FS4-7 pinout, AP7353D-32FS4-7 application, or AP7353D-32FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (≤153mV), enable threshold compatibility (EN high ≥1.2V), thermal resistance (θ_JA = 237°C/W), and discharge functionality for fast 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 path (35Ω N-channel MOSFET) actively pulls the output to ground when disabled, eliminating residual voltage on downstream capacitors.

This regulator operates across 2.0V–5.5V input range and maintains ±1% output accuracy over -40°C to +85°C ambient. Fast load transient response (<20µs settling time) and high PSRR up to 90dB at 1kHz support sensitive analog/RF circuits requiring clean, stable bias rails.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.2V ±1% - ensures precise biasing for 3.3V-tolerant logic and analog ICs without external feedback.
Max Output Current	250mA - supports moderate-power subsystems like camera ISPs or Bluetooth radios without derating.
PSRR	90dB @ 1kHz, 70dB @ 10kHz - suppresses switching noise from DC-DC converters feeding its input rail.
Output Noise	10µV_rms (10Hz–100kHz) - minimizes phase noise in RF local oscillators and jitter in ADC reference paths.
Quiescent Current	18µA typical - extends battery runtime in always-on wearable sensors and BLE peripherals.
Dropout Voltage	153mV @ 250mA - enables operation from single-cell Li-ion (3.0V min) while maintaining regulation.
Enable Threshold	EN high ≥1.2V - compatible with 1.8V/3.3V GPIOs; EN low ≤0.4V ensures reliable shutdown.

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm footprint, 0.4mm pitch, exposed thermal pad (EP) for enhanced heat dissipation. Requires solder mask defined pads per Diodes' recommended layout (D2/E2 = 0.48mm, L = 0.25mm).

Pin/Terminal	Circuit Role	Design Meaning
1: OUT	Regulated Power Output	Delivers stable 3.2V to load; must be decoupled with ≥1µF ceramic capacitor placed adjacent to pin.
2: GND	Ground Reference	Primary return path for output current; connects to PCB ground plane to minimize impedance and noise coupling.
3: EN	Enable Control Input	Active-high digital control: ≥1.2V enables regulation; ≤0.4V disables output and activates internal discharge path.
4: IN	Input Power Supply	Accepts 2.0V–5.5V input; requires ≥1µF ceramic capacitor between IN and GND to suppress supply transients.
EP	Exposed Thermal Pad	Not electrically functional as GND; must be connected to large copper area tied to system ground for thermal relief (θ_JA = 237°C/W).

Key Features

Feature	Design Value
Auto-discharge function	35Ω internal NMOS discharges OUT to GND within microseconds after EN deactivation, preventing latch-up in cascaded regulators.
Ultra-low noise output	10µV_rms (10Hz–100kHz) enables direct powering of VCOs, PLLs, and high-resolution ADC references without additional filtering.
High PSRR at 10kHz	70dB rejection at 10kHz suppresses mid-frequency noise from buck converter switching harmonics and digital clock coupling.
Low dropout at full load	153mV dropout at 250mA allows use with 3.3V input rails while delivering regulated 3.2V, maximizing efficiency in space-constrained designs.
Wide input voltage range	2.0V–5.5V operation supports single-cell Li-ion, USB-powered, and multi-rail systems without external pre-regulation.

Applications

RF Power Supply

Camera Image Signal Processor

Use Scenario: Providing clean bias to RF front-end amplifiers and mixers in Bluetooth/Wi-Fi modules.

IC Role / Device Role / Timing Role: Low-noise LDO supplying 3.2V V_CC to RF transceivers, replacing noisier switching regulators.

Use Value: 10µV_rms noise prevents degradation of receiver sensitivity and EVM in 2.4GHz ISM band operation.

Use Scenario: Powering image signal processors and CIS analog front-ends in smartphone cameras.

IC Role / Device Role / Timing Role: Stable 3.2V rail for ISP core logic and analog sensor interface, synchronized with frame capture timing.

Use Value: ±1% output accuracy ensures consistent pixel gain calibration; fast load transient response (<20µs) avoids frame corruption during exposure bursts.

Portable Media Player Audio

Wearable Sensor Hub

Use Scenario: Supplying DACs, headphone amplifiers, and audio codecs in portable music players.

IC Role / Device Role / Timing Role: Ultra-low-noise 3.2V source for audio signal chain, decoupled from noisy digital subsystems.

Use Value: 90dB PSRR at 1kHz eliminates audible switching artifacts from shared PMIC inputs, preserving SNR >105dB.

Use Scenario: Powering always-on motion sensors, environmental monitors, and BLE SoCs in fitness trackers.

IC Role / Device Role / Timing Role: Enable-controlled 3.2V supply enabling duty-cycled operation of sensor fusion algorithms.

Use Value: 18µA quiescent current extends battery life beyond 7 days; auto-discharge prevents false wake-ups from floating output nodes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7361D-32FS4-7	Higher output current (600mA), same 3.2V fixed output and DFN1010-4 package; 25µA IQ, 120mV dropout @ 600mA.	Supports higher-current loads (e.g., multi-core microcontrollers); larger thermal footprint required for full-load operation.	Select when peak load exceeds 250mA but board space remains constrained.
MCP1703T-3202E/MB	3.2V fixed output, SOT-23-5 package; 4µA IQ, 600mV dropout @ 250mA, no enable or discharge.	Lacks EN control and auto-discharge; suited for always-on, ultra-low-power applications where shutdown is not required.	Choose for cost-sensitive, non-shutdown designs needing minimal quiescent current, accepting higher dropout.

Compared with AP7353D-32FS4-7, AP7361D-32FS4-7 trades higher current capability for slightly increased quiescent current and thermal demand, while MCP1703T-3202E/MB sacrifices enable/discharge functionality and PSRR performance for ultra-low IQ and lower cost in fixed-always-on roles.

Availability

AP7353D-32FS4-7 is available at Aetrix Electronics and suitable for RF power supplies, camera ISP subsystems, portable media audio stages, and wearable sensor hubs requiring stable component supply with guaranteed long-term availability.

Supply support for AP7353D-32FS4-7 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 AP7353 series belongs to Diodes' high-performance LDO portfolio, designed specifically for noise-sensitive portable electronics requiring low IQ, high PSRR, and fast transient response in ultra-small packages.

FAQ

What is the purpose of the exposed thermal pad (EP) on AP7353D-32FS4-7?

The exposed thermal pad (EP) is a mechanical thermal relief feature-not an electrical terminal-and must be soldered to a large PCB copper area connected to ground. This reduces junction-to-ambient thermal resistance to 237°C/W, enabling safe 250mA operation at +85°C ambient without derating. It must not be used as the sole GND connection point.

Does AP7353D-32FS4-7 require an external output capacitor, and what type is recommended?

Yes, a minimum 1µF X7R or X5R ceramic capacitor is required between OUT and GND for stability and transient response. The capacitor must be placed within 2mm of the OUT and GND pins. ESR must remain below 2Ω; low-ESR types are mandatory for applications with rapid load steps (e.g., camera flash LED pulsing).

How does the auto-discharge function operate, and when is it active?

The auto-discharge path-a 35Ω internal NMOS-connects OUT to GND only when EN is driven low (≤0.4V). It activates within microseconds of disable, discharging output capacitance to <100mV in under 100µs for 1µF C_OUT. This prevents back-powering of upstream circuitry and ensures deterministic reset sequencing.

Can AP7353D-32FS4-7 be used with input voltages below 2.0V?

No. The absolute minimum input voltage is 2.0V per datasheet specifications. Operation below this violates recommended conditions and may cause regulation loss, increased dropout, or undefined behavior. For sub-2.0V applications, consider Diodes' AP7363 series (1.7V min VIN) or alternative ultra-low-VIN LDOs.

AP7353D-32FS4-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 4-XDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 3.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.146V @ 250mA

Current - Output:: 250mA

Current - Quiescent (Iq):: 27 µA

Current - Supply (Max):: -

PSRR:: 90dB ~ 70dB (100Hz ~ 10kHz)

Control Features:: Current Limit, Enable

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: X2-DFN1010-4 (Type B)

AP7353D-32FS4-7 FAQ

1.How can I place an order for AP7353D-32FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7353D-32FS4-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AP7353D-32FS4-7 reliable?

The price and inventory of AP7353D-32FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353D-32FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7353D-32FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353D-32FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7353D-32FS4-7?

AP7353D-32FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7353D-32FS4-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AP7353D-32FS4-7?

For technical support, including AP7353D-32FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353D-32FS4-7 requirements.

6.How does Aetrix verify that AP7353D-32FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7353D-32FS4-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AP7353D-32FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7353D-32FS4-7?

All AP7353D-32FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353D-32FS4-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AP7353D-32FS4-7 part is unused and in its original packaging.

Return procedure for AP7353D-32FS4-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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