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 AP7348D-2518RS4-7

Name: AP7348D-2518RS4-7
Brand: Diodes Incorporated
SKU: AP7348D-2518RS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AP7348D-2518RS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 8-XFDFN Exposed Pad

Datasheet:: AP7348D-2518RS4-7.pdf

Description:: LDO CMOS LOWCURR X1-DFN1612-8 T&

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,503

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

Product details

Overview

AP7348D-2518RS4-7 from Diodes Incorporated is a quad-channel 300mA low-dropout linear regulator with independent enable control (EN1 for VOUT1/VOUT3, EN2 for VOUT2/VOUT4), ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It delivers fixed 2.5V on Channel 1 & 3 and 1.8V on Channel 2 & 4, in an X1-DFN1612-8 (Type B) package, targeting multi-rail power management in compact wireless modules.

For engineers reviewing the AP7348D-2518RS4-7 datasheet, AP7348D-2518RS4-7 pinout, AP7348D-2518RS4-7 application, or AP7348D-2518RS4-7 equivalent, this device supports simultaneous dual-voltage rail generation with channel-level shutdown, thermal fault protection per channel, and ultra-low quiescent current (160µA total), making it critical for battery-sensitive IoT sensor nodes and camera module power sequencing.

Technical Context

The AP7348D-2518RS4-7 integrates two independent voltage references and four CMOS-based LDO channels, each with dedicated error amplifiers, foldback current limiting, and auto-discharge circuitry. Its dual-enable architecture enables selective activation of complementary channel pairs (CH1+CH3 or CH2+CH4), supporting staggered power-up sequences.

Each channel features independent overtemperature sensing that disables only the affected channel during thermal fault-except under global overtemperature (>155°C), where all four outputs shut down. The device operates across 1.7V–5.25V input range and maintains stability with 1µF ceramic output capacitors, leveraging low ESR requirements (<1Ω at 300mA) verified per ESR vs. I_OUT characterization.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	CH1/CH3 = 2.5V, CH2/CH4 = 1.8V - fixed dual-rail configuration enabling independent analog/digital domain supply without external resistors
Output Accuracy	±1% at +25°C - ensures tight regulation for noise-sensitive RF receivers and precision ADC reference domains
PSRR	75dB at 1kHz - suppresses switching noise from upstream DC-DC converters feeding VDD, critical for clean RF supply rails
Output Noise	60µV_rms (10Hz–100kHz) - minimizes phase noise degradation in local oscillator circuits and high-resolution image sensor analog front-ends
Quiescent Current	160µA total (all channels enabled) - extends battery life in always-on LPWAN edge nodes with periodic wake-up cycles
Dropout Voltage	0.27V max at 300mA (for 2.5V output) - allows operation from single-cell Li-ion (3.0V min) while sustaining full load on all channels
Thermal Shutdown	155°C threshold with 25°C hysteresis - prevents latch-up during transient overload in sealed camera housings or enclosed IoT gateways

Pinout & Package

X1-DFN1612-8 (Type B) package: 1.6mm × 1.2mm footprint, 0.4mm pitch, exposed thermal pad (electrically isolated or grounded) for enhanced thermal dissipation in space-constrained layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Ground reference	Primary return path for all four channels; must connect to low-impedance PCB ground plane to minimize noise coupling between rails
2 VOUT3	Channel 3 output	Delivers fixed 2.5V; requires local 1µF ceramic capacitor placed within 2mm of pin to ensure transient response and stability
3 VOUT4	Channel 4 output	Delivers fixed 1.8V; shares EN2 control with VOUT2; discharge path active during EN2 low to prevent backfeed into powered subsystems
4 EN2	Enable for CH2 & CH4	Active-high logic input; 1.3V min high threshold ensures compatibility with 1.8V GPIO; pulls internal N-FET gate to enable/disable both channels simultaneously
5 VOUT2	Channel 2 output	Delivers fixed 1.8V; paired with VOUT4 under EN2 control; short-circuit current limited to 55mA to protect SoC I/O domains during fault
6 VDD	Main power input	Accepts 1.7V–5.25V; requires 4.7µF ceramic decoupling capacitor placed adjacent to pin to suppress input ripple from shared PMIC rails
7 VOUT1	Channel 1 output	Delivers fixed 2.5V; paired with VOUT3 under EN1 control; independent discharge prevents cross-rail coupling during partial shutdown
8 EN1	Enable for CH1 & CH3	Active-high logic input; identical electrical specs to EN2; enables hardware-controlled power sequencing between 2.5V analog and 1.8V digital subsystems

Key Features

Feature	Design Value
Dual independent enable inputs	EN1 controls CH1/CH3 (2.5V), EN2 controls CH2/CH4 (1.8V) - enables precise power sequencing for mixed-signal SoCs requiring staggered rail activation
Per-channel thermal shutdown	Each LDO monitors junction temperature; individual channel disable prevents system-wide failure during localized overheating in dense PCB layouts
Auto-discharge on disable	Internal 10Ω N-FET discharges VOUT pins when ENx = low - eliminates residual voltage that could cause latch-up in downstream logic or violate reset timing
Low-noise CMOS architecture	60µV_rms noise floor with no external bypass capacitor required - reduces bill-of-materials and PCB area versus bipolar LDOs needing noise-reduction caps
High PSRR with wide bandwidth	75dB rejection at 1kHz and maintained >50dB up to 100kHz - effectively filters ripple from 1MHz+ switching regulators used in compact power trees

Applications

Smartphone Camera Module

LPWAN Sensor Node

Use Scenario: Powering image sensor (2.5V analog core) and ISP processor (1.8V I/O) in ultra-thin mobile camera stacks.

IC Role / Device Role / Timing Role: Quad-LDO provides isolated, low-noise rails with independent enable control for synchronized sensor initialization and ISP boot sequence.

Use Value: 60µV_rms noise prevents fixed-pattern noise in raw image data; dual-enable allows 2.5V rail stabilization before 1.8V logic activation, avoiding I/O contention.

Use Scenario: Supplying sub-GHz transceiver (1.8V) and microcontroller (2.5V) in battery-powered NB-IoT endpoint devices.

IC Role / Device Role / Timing Role: Single-package dual-voltage source replaces discrete LDOs, reducing layout area by 40% while enabling deep-sleep current optimization via EN2-only shutdown.

Use Value: 160µA total quiescent current extends 10-year battery life; 75dB PSRR rejects noise from cellular baseband ICs sharing same PCB layer.

Wi-Fi 6 Access Point RF Front-End

Industrial Camera Module

Use Scenario: Delivering clean 2.5V bias to RF power amplifier and 1.8V supply to Wi-Fi SoC in compact access point PCBs.

IC Role / Device Role / Timing Role: High-PSRR LDO isolates sensitive RF PA from noisy digital SoC supply, with EN1/EN2 allowing dynamic PA enable during transmit bursts.

Use Value: 0.27V dropout at 300mA permits operation from 3.3V intermediate rail; thermal shutdown prevents PA thermal runaway during sustained transmission.

Use Scenario: Powering CMOS image sensor (2.5V) and FPGA interface (1.8V) in factory-floor machine vision cameras subject to ambient temperature swings.

IC Role / Device Role / Timing Role: Per-channel overtemperature sensing disables only the overloaded rail (e.g., FPGA domain) while maintaining sensor operation for diagnostic continuity.

Use Value: ±1% output accuracy ensures consistent ADC reference voltage across -40°C to +85°C; 1.6mm × 1.2mm package fits beneath lens mount in space-limited enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6217D2518MR-G	Same 2.5V/1.8V dual-rail output, but only 200mA per channel and no per-channel thermal shutdown	Lacks independent channel disable and auto-discharge; unsuitable for systems requiring rail isolation during fault	Select if cost sensitivity outweighs need for 300mA capability and thermal fault granularity
Richtek RT9080L-2518GJ6F	Higher 500mA per channel, but 250µA quiescent current and no independent EN pins (single enable)	Single enable forces simultaneous rail activation/shutdown, incompatible with sequenced power-up in mixed-signal SoCs	Prefer for high-current applications where rail coordination is acceptable and noise performance is secondary

Compared with XC6217D2518MR-G and RT9080L-2518GJ6F, the AP7348D-2518RS4-7 uniquely balances 300mA/channel capability, 160µA quiescent current, dual independent enables, and per-channel thermal protection-making it optimal for space-constrained, battery-operated systems requiring robust rail management.

Availability

AP7348D-2518RS4-7 is available at Aetrix Electronics and suitable for smartphone camera modules, LPWAN sensor nodes, and Wi-Fi 6 RF front-ends requiring stable component supply, guaranteed long-term availability, and traceable sourcing for production ramp.

Supply support for AP7348D-2518RS4-7 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 ICs, with design centers in Asia, Europe, and the U.S., serving automotive, industrial, computing, and consumer markets.

The AP7348 series belongs to Diodes' high-PSRR, low-noise LDO portfolio engineered specifically for multi-rail power management in compact wireless and imaging applications where board space, thermal density, and noise immunity are critical constraints.

FAQ

What is the maximum allowable power dissipation for AP7348D-2518RS4-7?

The absolute maximum power dissipation is 600mW, as specified in the Absolute Maximum Ratings table. Exceeding this limit triggers thermal shutdown at 155°C, causing all four outputs to disable. Designers must calculate worst-case power per channel (P = (V_IN − V_OUT) × I_OUT) and ensure θ_JA = 160°C/W with proper PCB copper area does not exceed this limit under ambient +85°C conditions.

Can AP7348D-2518RS4-7 operate with only one enable pin asserted?

Yes. Driving EN1 high while holding EN2 low powers only VOUT1 and VOUT3 (2.5V rails), with VOUT2 and VOUT4 (1.8V) fully discharged. This configuration is valid and commonly used to power analog subsystems independently of digital logic, leveraging the device's built-in discharge FETs to prevent backfeed and ensure clean reset states.

Is an input capacitor mandatory for stable operation?

Yes. A minimum 4.7µF ceramic capacitor between VDD and GND is required to prevent input voltage droop during load transients and ensure stability. The datasheet specifies this value based on testing with 1µF output capacitors; omitting or undersizing C_IN risks oscillation and degraded PSRR, particularly when VDD is sourced from a high-impedance DC-DC converter output.

How does the AP7348D-2518RS4-7 handle short-circuit conditions?

Each channel limits short-circuit current to approximately 55mA when its VOUT pin is pulled to GND. This foldback protection prevents thermal damage and allows safe recovery once the fault is removed. Unlike latch-off schemes, the device resumes normal regulation automatically after the short is cleared, provided input voltage remains within specification and thermal limits are not exceeded.

AP7348D-2518RS4-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-XFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 4

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 2.5V, 2.5V, 1.8V, 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.36V @ 300mA, 0.36V @ 300mA, 0.48V @ 300mA, 0.48V @ 300mA

Current - Output:: 300mA, 300mA, 300mA, 300mA

Current - Quiescent (Iq):: 280 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: 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:: X1-DFN1612-8 (Type B)

AP7348D-2518RS4-7 FAQ

1.How can I place an order for AP7348D-2518RS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7348D-2518RS4-7 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 AP7348D-2518RS4-7 reliable?

The price and inventory of AP7348D-2518RS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7348D-2518RS4-7 is usually 5 days.

3.What payment methods are accepted for AP7348D-2518RS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7348D-2518RS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7348D-2518RS4-7?

AP7348D-2518RS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7348D-2518RS4-7 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 AP7348D-2518RS4-7?

For technical support, including AP7348D-2518RS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7348D-2518RS4-7 requirements.

6.How does Aetrix verify that AP7348D-2518RS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7348D-2518RS4-7 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 AP7348D-2518RS4-7 meets industry standards.

7.What is the process for return or replacement of AP7348D-2518RS4-7?

All AP7348D-2518RS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7348D-2518RS4-7, 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 AP7348D-2518RS4-7 part is unused and in its original packaging.

Return procedure for AP7348D-2518RS4-7:

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…