Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated AP7353-28FS4-7

Name: AP7353-28FS4-7
Brand: Diodes Incorporated
SKU: AP7353-28FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AP7353-28FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7353-28FS4-7.pdf

Description:: IC REG LINEAR 2.8V 250MA 4DFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,629

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AP7353-28FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 2.8V 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 in portable communication devices.

For engineers reviewing the AP7353-28FS4-7 datasheet, AP7353-28FS4-7 pinout, AP7353-28FS4-7 application, or AP7353-28FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (73mV typ. @ V_OUT=2.8V), package thermal resistance (θ_JA = 237°C/W), EN logic thresholds (V_IL ≤ 0.4V, V_IH ≥ 1.2V), and stability with 1µF ceramic output capacitance.

Technical Context

The AP7353-28FS4-7 implements 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 to 5.5V input range and delivers regulated 2.8V output with load regulation of 0.004%/mA (Type B package) and line regulation of 0.02%/V. Fast transient response (<20µs load step recovery) and high PSRR (>70dB up to 10kHz) support sensitive analog/RF circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±1% - ensures stable biasing for 2.8V I/O domains without external feedback.
Max Output Current	250mA - supports moderate-power RF ICs, camera modules, and baseband processors.
PSRR	90dB @ 1kHz, 70dB @ 10kHz - suppresses switching noise from PMICs or DC-DC converters feeding the LDO input.
Output Noise	10µV_rms (10Hz–100kHz) - minimizes phase noise in RF synthesizers and jitter in high-speed interfaces.
Quiescent Current	18µA typ. - extends battery life in always-on wearable sensors and Bluetooth LE peripherals.
Dropout Voltage	73mV typ. @ 250mA - enables operation from single-cell Li-ion (3.0V min) while maintaining regulation.
Enable Thresholds	V_IL ≤ 0.4V, V_IH ≥ 1.2V - compatible with 1.8V/3.3V GPIOs without level-shifting.

Pinout & Package

AP7353-28FS4-7 uses the X2-DFN1010-4 (Type B) 1.0mm × 1.0mm, 0.65mm pitch, thermally enhanced 4-pin package with exposed pad (EP). Recommended PCB layout uses large copper area under EP connected to GND for optimal thermal dissipation.

Pin/Terminal	Circuit Role	Design Meaning
1: OUT	Regulated Power Output	Delivers stable 2.8V to load; requires 1µF ceramic capacitor placed adjacent to pin for stability and transient response.
2: GND	Ground Reference	Primary return path for output current and internal circuitry; must connect directly to low-impedance ground plane.
3: EN	Enable Control Input	Active-high logic input; drives regulator ON/OFF; must not float-tie to IN or MCU GPIO with defined voltage levels.
4: IN	Power Input	Accepts 2.0–5.5V unregulated supply; requires 1µF ceramic decoupling capacitor placed near pin to suppress input ripple.
EP	Exposed Thermal Pad	Not electrically functional; soldered to GND copper pour to reduce θ_JA from 237°C/W to ~120°C/W in typical layouts.

Key Features

Feature	Design Value
High PSRR	90dB @ 1kHz enables clean power delivery to RF transceivers even when sharing noisy DC-DC input rails.
Ultra-Low Noise	10µV_rms output noise preserves signal integrity in ADC reference supplies and PLL VCO biasing.
Low Quiescent Current	18µA typ. allows >1-year battery life in coin-cell-powered IoT sensors operating in deep-sleep mode.
Fast Load Transient Response	<20µs recovery time maintains voltage within ±2% during 1mA ↔ 250mA load steps-critical for burst-mode RF transmission.
Thermal & Short-Circuit Protection	Auto-shutdown at T_J > +125°C and current limit ~350mA prevent damage during fault conditions or layout errors.

Applications

Smartphone Camera Module

Bluetooth LE Audio Earbud

Use Scenario: Powers image sensor analog front-end and ISP core requiring ultra-low-noise 2.8V rail.

IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated 2.8V supply with <10µV_rms noise to minimize sensor readout noise and color crosstalk.

Use Value: Enables 12-bit+ dynamic range in compact mobile cameras by suppressing power-induced fixed-pattern noise.

Use Scenario: Supplies 2.8V to Bluetooth audio codec and Class-D amplifier in space-constrained earbuds.

IC Role / Device Role / Timing Role: Low-I_Q LDO enabling <20µA system standby current while maintaining fast wake-up capability via EN pin.

Use Value: Extends single-charge battery life to >8 hours playback and >120 hours standby without compromising audio SNR.

Wi-Fi 6 IoT Gateway RF Front-End

Wearable Health Monitor Sensor Hub

Use Scenario: Provides 2.8V bias to Wi-Fi 6 power amplifier driver stage in low-cost home gateway designs.

IC Role / Device Role / Timing Role: High-PSRR LDO rejecting noise from shared 3.3V buck converter, ensuring EVM compliance under burst transmit loads.

Use Value: Maintains -35dB EVM at 256-QAM without adding costly LC filtering or separate power islands.

Use Scenario: Powers optical heart-rate sensor (PPG) analog chain and low-noise ADC in wrist-worn fitness tracker.

IC Role / Device Role / Timing Role: Precision LDO with ±1% output accuracy and low tempco (±30ppm/°C) ensuring consistent LED drive current and ADC reference stability.

Use Value: Reduces motion-artifact sensitivity by stabilizing photodiode bias and eliminating gain drift across -10°C to +50°C ambient.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7361-28FS4-7	Higher output current (600mA), higher quiescent current (25µA typ.), same 2.8V output and package.	Better suited for systems with peak loads >250mA (e.g., multi-sensor hubs), but trades off battery runtime.	Select when future-proofing for higher-current peripherals without changing PCB layout.
MCP1703T-2802E/MB	Same 2.8V/250mA rating, but 6µA I_Q, lower PSRR (60dB @ 1kHz), SOT-23-5 package (larger footprint).	Lower noise sensitivity makes it viable for non-RF applications like MCU core supplies where size is less constrained.	Choose for cost-sensitive, non-RF embedded control where ultra-low I_Q outweighs PSRR and noise requirements.

Compared with AP7361-28FS4-7 and MCP1703T-2802E/MB, the AP7353-28FS4-7 uniquely balances ultra-low noise, high PSRR, and minimal footprint-making it optimal for RF and imaging subsystems where both spectral purity and board area are critical.

Availability

AP7353-28FS4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, Bluetooth LE audio earbuds, and Wi-Fi 6 IoT gateways requiring stable component supply, high-volume tape-and-reel fulfillment, and long-term lifecycle assurance.

Supply support for AP7353-28FS4-7 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' precision LDO portfolio, engineered specifically for noise-sensitive portable electronics requiring simultaneous low I_Q, high PSRR, and small-footprint packaging.

FAQ

What is the minimum input voltage required for AP7353-28FS4-7 to maintain regulation at full 250mA load?

The minimum input voltage is determined by dropout voltage: at 250mA and 2.8V output, typical dropout is 73mV (max 155mV per datasheet). Thus, VIN must be ≥ 2.873V (typical) or ≥ 2.955V (worst-case) to sustain regulation. Below this, output voltage drops linearly with input.

Can AP7353-28FS4-7 be used without an output capacitor?

No. The device requires a minimum 0.7µF ceramic output capacitor (1µF recommended) for stability and transient response. Omitting C_OUT causes oscillation and potential damage. X7R/X5R dielectrics are specified to maintain effective capacitance across temperature and bias.

Is the exposed pad (EP) on AP7353-28FS4-7 electrically connected to GND internally?

No-the EP is a thermal pad only, not bonded to any internal node. It must be soldered to a PCB copper pour connected to GND to improve thermal performance (reducing θ_JA from 237°C/W to ~120°C/W), but it serves no electrical function and must not be used as a GND terminal.

Does AP7353-28FS4-7 include output discharge functionality?

No. AP7353-28FS4-7 is the non-discharge variant (no "D" suffix). When disabled via EN, the output remains floating and retains charge on downstream capacitors. For active discharge, select AP7353D-28FS4-7, which integrates a 35Ω NMOS discharge path.

AP7353-28FS4-7 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):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.155V @ 250mA

Current - Output:: 250mA

Current - Quiescent (Iq):: 27 µA

Current - Supply (Max):: -

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

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

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

AP7353-28FS4-7 FAQ

1.How can I place an order for AP7353-28FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7353-28FS4-7 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 AP7353-28FS4-7 reliable?

The price and inventory of AP7353-28FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353-28FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7353-28FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353-28FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7353-28FS4-7?

AP7353-28FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7353-28FS4-7 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 AP7353-28FS4-7?

For technical support, including AP7353-28FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353-28FS4-7 requirements.

6.How does Aetrix verify that AP7353-28FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7353-28FS4-7 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 AP7353-28FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7353-28FS4-7?

All AP7353-28FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353-28FS4-7, 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 AP7353-28FS4-7 part is unused and in its original packaging.

Return procedure for AP7353-28FS4-7:

1.Submit a request within 90 days.

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

Tech Hub

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …

2026-07-06 Voltage Regulator: Types, Circuits, Testing and Selection Guide

Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.

2026-06-30 Amplifiers Explained: Types, Circuits, Gain, Classes and Applications

Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…