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

Diodes Incorporated AP7353D-33FS4-7

Name: AP7353D-33FS4-7
Brand: Diodes Incorporated
SKU: AP7353D-33FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7353D-33FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7353D-33FS4-7.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7353D-33FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 3.3V output, high PSRR (90dB at 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 stable power for RF supply rails and portable media subsystems where noise-sensitive analog circuitry coexists with digital loads.

For engineers reviewing the AP7353D-33FS4-7 datasheet, AP7353D-33FS4-7 pinout, AP7353D-33FS4-7 application, or AP7353D-33FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (max 142mV @ 3.3V), 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 architecture supports fast load transient response (<20µs recovery for 1mA→250mA step) and includes an internal N-channel discharge transistor (R_ON ≈35Ω) activated when EN is pulled low.

It operates across 2.0V–5.5V input range with ±1% output accuracy over -40°C to +85°C ambient, and achieves 0.004%/mA load regulation in the X2-DFN1010-4 package. The device requires only 1µF ceramic input/output capacitors and is stable without ESR constraints.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±1% - ensures precise biasing for 3.3V logic, USB PHY, and RF ICs without external feedback.
Max Output Current	250mA - sufficient to power single-core microcontrollers, camera sensor interfaces, or dual-band RF front-ends.
PSRR	90dB at 1kHz, 70dB at 10kHz - suppresses switching noise from DC/DC converters feeding the LDO input.
Output Noise	10µV_rms (10Hz–100kHz) - enables clean power for ADC references, VCOs, and low-noise amplifiers.
Quiescent Current	18µA typical - extends battery life in always-on wearable sensors and Bluetooth LE peripherals.
Dropout Voltage	142mV max at 250mA - allows operation from 3.442V input, compatible with single-cell Li-ion (3.6V nominal) or 3.6V supply rails.
Enable Threshold	V_EN(H) ≥1.2V, V_EN(L) ≤0.4V - interfaces directly with 1.8V/3.3V GPIO without level-shifting.

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm body, 0.65mm pitch, exposed thermal pad (EP) on bottom. Requires solder mask defined pads per Diodes' recommended layout (D2/E2 = 0.48mm, C = 0.65mm).

Pin/Terminal	Circuit Role	Design Meaning
1: OUT	Regulated output node	Delivers 3.3V to load; must be decoupled with ≥1µF ceramic capacitor placed adjacent to pin.
2: GND	Power ground reference	Primary return path for output current; connects to PCB ground plane and EP for thermal conduction.
3: EN	Active-high enable control	Pull ≥1.2V to activate regulator; pull ≤0.4V to disable and engage internal discharge transistor.
4: IN	Input power supply	Accepts 2.0–5.5V; requires ≥1µF ceramic capacitor between IN and GND, placed within 2mm of pin.
EP	Exposed thermal pad	Not electrically functional; must be connected to GND plane via ≥4 thermal vias for θ_JA = 237°C/W performance.

Key Features

Feature	Design Value
Integrated discharge transistor	35Ω ON-resistance enables rapid VOUT discharge (<100µs) upon shutdown-critical for sequencing in multi-rail systems.
Ultra-low noise output	10µV_rms (10Hz–100kHz) eliminates need for post-LDO filtering in RF receiver chains and precision data converters.
High PSRR at 10kHz	70dB rejection at 10kHz suppresses noise from high-frequency buck converters operating near 1MHz switching frequency.
Low-load quiescent current	18µA typical at zero load enables >1-year battery life in coin-cell-powered IoT sensors with periodic wake-up.
Wide input voltage range	2.0V–5.5V supports direct connection to Li-ion (3.0–4.2V), USB (4.75–5.25V), or boosted 3.3V rails without pre-regulation.

Applications

Smartphone Camera Module

Wireless Audio Transceiver

Use Scenario: Powers image signal processor (ISP) and CMOS image sensor analog core in compact smartphone rear cameras.

IC Role / Device Role / Timing Role: Provides ultra-low-noise 3.3V bias for sensor analog front-end and ISP reference voltage.

Use Value: 10µV_rms noise prevents fixed-pattern noise in raw image data; 250mA output supports dual-sensor concurrent operation.

Use Scenario: Supplies 3.3V to Bluetooth 5.0 SoC and MEMS microphone preamplifier in true wireless stereo earbuds.

IC Role / Device Role / Timing Role: Delivers stable rail during RF transmit bursts while maintaining <18µA quiescent draw in sleep mode.

Use Value: 90dB PSRR isolates audio path from 2.4GHz RF switching noise; fast load transient response prevents brownout during TX ramp-up.

Portable Media Player Display

RF Front-End Power

Use Scenario: Powers OLED display driver IC and touch controller in handheld gaming devices.

IC Role / Device Role / Timing Role: Regulates 3.3V for display interface logic and gamma reference generation.

Use Value: ±1% output accuracy ensures consistent pixel brightness; 142mV dropout enables operation down to 3.44V input from aging batteries.

Use Scenario: Supplies clean 3.3V to GaAs pHEMT power amplifier and LNA in 5GHz Wi-Fi 6 client modules.

IC Role / Device Role / Timing Role: Acts as noise-filtering post-regulator for RF chain powered by noisy buck converter.

Use Value: 70dB PSRR at 10kHz attenuates switching harmonics that degrade EVM; discharge function prevents latch-up during PA enable sequencing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-3302E/TO	250mA, 6µV_rms noise, no enable pin, SOT-23-5 package	Lacks EN control and discharge; unsuitable for power sequencing or battery-critical shutdown	Select only if enable/discharge is unused and board space permits larger SOT-23 footprint.
Torex XC6210B332MR-G	200mA, 15µV_rms, 1.8–6.0V input, DFN1010-4 package	Lower current rating limits use in multi-peripheral systems; no integrated discharge transistor	Choose when 200mA suffices and cost sensitivity outweighs need for fast discharge or 250mA margin.

Compared with MCP1700-3302E/TO and XC6210B332MR-G, AP7353D-33FS4-7 uniquely combines 250mA output, 10µV_rms noise, and active discharge in a 1.0mm² DFN-enabling compact, noise-immune, and sequenced power delivery unattainable with either alternative.

Availability

AP7353D-33FS4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, wireless audio transceivers, and RF front-end power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP7353D-33FS4-7 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.

The AP7353 series targets portable and battery-powered applications demanding ultra-low noise, high PSRR, and minimal quiescent current-specifically engineered for RF, imaging, and wearables where power integrity directly impacts signal fidelity.

FAQ

What is the minimum input voltage required for AP7353D-33FS4-7 to maintain regulated 3.3V output at 250mA?

The maximum dropout voltage is 142mV at 250mA and 3.3V output, so minimum input voltage is 3.3V + 0.142V = 3.442V. This value is validated per Electrical Characteristics table for X2-DFN1010-4 package under VOUT = 3.3V, IOUT = 250mA conditions.

Does AP7353D-33FS4-7 require an external resistor network to set output voltage?

No. AP7353D-33FS4-7 has a factory-trimmed internal resistor network for fixed 3.3V output. No external components are needed for voltage setting-only 1µF input and output ceramic capacitors are required for stability and transient performance.

How does the discharge function operate, and what is its impact on system sequencing?

When EN is pulled low, the internal 35Ω N-channel transistor connects OUT to GND, discharging output capacitance rapidly. This prevents floating voltages during power-down and enables strict sequencing in multi-rail systems where downstream logic must deassert before upstream supplies collapse.

Can AP7353D-33FS4-7 be used in automotive applications?

AP7353D-33FS4-7 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AP7353Q series) with PPAP capability and IATF 16949 manufacturing-contact Diodes directly for qualified alternatives if automotive temperature range (-40°C to +125°C) or qualification is required.

AP7353D-33FS4-7 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):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.142V @ 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-33FS4-7 FAQ

1.How can I place an order for AP7353D-33FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7353D-33FS4-7 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-33FS4-7 reliable?

The price and inventory of AP7353D-33FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353D-33FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7353D-33FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353D-33FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7353D-33FS4-7?

AP7353D-33FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7353D-33FS4-7 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-33FS4-7?

For technical support, including AP7353D-33FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353D-33FS4-7 requirements.

6.How does Aetrix verify that AP7353D-33FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7353D-33FS4-7 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-33FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7353D-33FS4-7?

All AP7353D-33FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353D-33FS4-7, 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-33FS4-7 part is unused and in its original packaging.

Return procedure for AP7353D-33FS4-7:

1.Submit a request within 90 days.

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

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