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

Diodes Incorporated AP7343D-14FS4-7B

Name: AP7343D-14FS4-7B
Brand: Diodes Incorporated
SKU: AP7343D-14FS4-7B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7343D-14FS4-7B

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7343D-14FS4-7B.pdf

Description:: IC REG LINEAR 1.4V 300MA 4DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7343D-14FS4-7B from Diodes Incorporated is a 300mA, 1.4V fixed-output low-dropout linear regulator with high PSRR (75dB at 1kHz), ultra-low output noise (60µVrms), ±1% output voltage accuracy, and enable-controlled shutdown. Built on CMOS process, it delivers stable power to RF supplies and portable media subsystems where low quiescent current (35µA) and fast load transient response are critical.

For engineers reviewing the AP7343D-14FS4-7B datasheet, AP7343D-14FS4-7B pinout, AP7343D-14FS4-7B application, or AP7343D-14FS4-7B equivalent, key selection criteria include its 1.7V–5.25V input range, 0.35V dropout at 300mA (for 1.4V output), X2-DFN1010-4 (Type B) package thermal performance (R_θJA = 237°C/W), and integrated auto-discharge function for rapid V_OUT discharge during shutdown.

Technical Context

The AP7343D-14FS4-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and thermal shutdown protection in a single CMOS LDO architecture. Its enable input (EN) provides precise on/off control with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V), and the built-in discharge MOSFET (R_ON = 30Ω typical) actively pulls V_OUT to GND when disabled.

Designed for low-noise analog and RF supply rails, it achieves 75dB ripple rejection at 1kHz and maintains stability with 1µF ceramic output capacitors. The device operates across –40°C to +85°C ambient, with junction temperature limited to +125°C and thermal shutdown triggered at +150°C (20°C hysteresis).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.4V ±1% at +25°C; ensures tight regulation for core logic or I/O supply rails requiring stable bias.
Max Output Current	300mA continuous; supports moderate-power subsystems such as camera ISPs or wireless baseband ICs.
Dropout Voltage	0.39V max at 300mA (1.4V output); enables operation from 1.79V input, ideal for single-cell Li-ion or Li-poly battery systems.
PSRR	75dB at 1kHz; suppresses switching noise from upstream DC/DC converters feeding sensitive RF or ADC circuits.
Output Noise	60µV_rms (10Hz–100kHz); minimizes phase noise in local oscillators and jitter in high-speed serial interfaces.
Quiescent Current	35µA typical; extends battery life in always-on sensor nodes or standby modes of portable devices.
Enable Thresholds	V_IL ≤ 0.5V / V_IH ≥ 1.3V; compatible with 1.8V and 3.3V GPIO logic without level-shifting.

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, exposed pad (EP) for thermal dissipation. Recommended PCB layout uses large copper area connected to GND under EP.

Pin/Terminal	Circuit Role	Design Meaning
PIN1 (VOUT)	Regulated power output	Delivers clean 1.4V supply; requires 1µF ceramic capacitor placed adjacent to minimize loop inductance.
PIN2 (GND)	Power ground reference	Primary return path for output current; must connect directly to low-impedance ground plane.
PIN3 (EN)	Active-high enable control	Drives regulator ON/OFF; floating state prohibited-tie to VIN if unused.
PIN4 (VIN)	Input power supply	Accepts 1.7V–5.25V; requires 0.47µF ceramic decoupling capacitor placed within 2mm.
EP (Exposed Pad)	Thermal conduction path	Not electrically functional; soldered to GND copper pour to reduce R_θJA by up to 30%.

Key Features

Feature	Design Value
Auto-discharge function	Integrated 30Ω NMOS discharges VOUT to GND in <100µs upon EN deactivation-prevents back-powering of upstream circuits.
High PSRR at low frequency	75dB @ 1kHz enables direct use after noisy buck converters without additional filtering stages.
Low-noise output	60µV_rms noise floor preserves signal integrity in RF front-ends and high-resolution ADC references.
Ultra-low quiescent current	35µA IQ allows >1-year battery life in coin-cell-powered IoT sensors operating at 10µA average load.
Wide input voltage range	1.7V–5.25V supports single-cell Li-ion (2.7–4.2V), USB (4.75–5.25V), and multi-rail PMIC outputs.

Applications

RF Power Amplifier Bias

Camera Image Signal Processor (ISP)

Use Scenario: Providing clean, low-noise bias voltage to GaAs or SiGe RF power amplifiers in 4G/5G mobile handsets.

IC Role / Device Role / Timing Role: Low-noise LDO supplying V_{CC_PA} rail; replaces noisier switching regulators to reduce AM-to-PM distortion.

Use Value: 75dB PSRR attenuates DC/DC switching artifacts at PA input, improving EVM by >3dB and reducing adjacent-channel leakage.

Use Scenario: Powering analog front-end and ADC sections of mobile camera modules.

IC Role / Device Role / Timing Role: Fixed 1.4V LDO delivering stable reference for image sensor analog signal chain.

Use Value: 60µV_rms output noise prevents fixed-pattern noise in raw image data, enabling 12-bit+ dynamic range capture.

Portable Media Player Audio Codec

Wireless Adapter Baseband Core

Use Scenario: Supplying low-noise V_{DD_IO} to stereo audio DACs and headphone amplifiers in Bluetooth speakers.

IC Role / Device Role / Timing Role: Enable-controlled LDO powering codec I/O interface; synchronized with system sleep/wake cycles.

Use Value: 35µA quiescent current reduces standby power by 70% vs. standard LDOs, extending playback time between charges.

Use Scenario: Regulating core voltage for Wi-Fi/BT SoCs in USB dongles and embedded modules.

IC Role / Device Role / Timing Role: 300mA-capable LDO delivering 1.4V to processor cores with fast load transient recovery (<50µs).

Use Value: 0.39V dropout enables full 300mA delivery from 1.79V input-critical for USB 2.0 bus-powered designs with voltage droop.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-1402E/TO	1.4V fixed, 250mA, 6µA IQ, no enable or discharge; SOT-23 package.	Lacks EN control and auto-discharge; unsuitable for systems requiring active shutdown sequencing.	Select when ultra-low IQ dominates over enable/discharge functionality and current demand ≤250mA.
Torex XC6210B142MR-G	1.4V fixed, 300mA, 45µA IQ, enable input, no discharge; SOT-25 package.	Same output/current specs but lacks discharge MOSFET; requires external circuitry for VOUT discharge.	Choose when board space permits discrete discharge FET and thermal performance (R_θJA = 179°C/W) is prioritized over footprint.

Compared with MCP1700-1402E/TO and XC6210B142MR-G, the AP7343D-14FS4-7B uniquely combines 300mA capability, 35µA IQ, enable control, and integrated discharge in a 1.0mm² DFN-enabling compact, low-power, and sequenced-power designs without external components.

Availability

AP7343D-14FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier bias, camera ISP supplies, portable media player audio codecs, and wireless adapter baseband cores requiring stable component supply, automotive-grade traceability, and long-term lifecycle support.

Supply support for AP7343D-14FS4-7B 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 connectivity solutions for consumer, industrial, and automotive markets.

The AP7343 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for battery-powered portable electronics demanding ultra-low noise, high PSRR, and minimal quiescent current in sub-2mm² packages.

FAQ

What is the maximum allowable input voltage for AP7343D-14FS4-7B?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V may trigger internal protection or degrade long-term reliability. Operation above 5.25V is not guaranteed per datasheet specifications and risks permanent damage.

Does AP7343D-14FS4-7B require an external discharge resistor?

No. The "D" suffix indicates integrated auto-discharge functionality via an internal 30Ω NMOS transistor that actively pulls VOUT to GND when EN is low. No external resistor or FET is needed-this eliminates BOM cost and PCB area versus non-discharge LDOs.

Can AP7343D-14FS4-7B be used with ceramic output capacitors smaller than 1µF?

Yes-stability is guaranteed with 1µF ceramic capacitors, but the datasheet confirms stable operation down to 0.47µF under specified ESR conditions. Using <1µF requires verifying ESR vs. output current per Figure 23 to remain within the stable region.

How does thermal performance differ between X2-DFN1010-4 (Type B) and SOT25 packages?

The X2-DFN1010-4 (Type B) has R_θJA = 237°C/W, while SOT25 is 179°C/W-meaning the SOT25 dissipates heat more effectively in standard layouts. However, the DFN's 1.0mm² footprint saves >60% board area, making it preferable where space constraints outweigh thermal margin needs.

AP7343D-14FS4-7B 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):: 5.25V

Voltage - Output (Min/Fixed):: 1.4V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.44V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: X2-DFN1010-4

AP7343D-14FS4-7B FAQ

1.How can I place an order for AP7343D-14FS4-7B through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7343D-14FS4-7B 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 AP7343D-14FS4-7B reliable?

The price and inventory of AP7343D-14FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343D-14FS4-7B is usually 5 days.

3.What payment methods are accepted for AP7343D-14FS4-7B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-14FS4-7B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7343D-14FS4-7B?

AP7343D-14FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7343D-14FS4-7B 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 AP7343D-14FS4-7B?

For technical support, including AP7343D-14FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-14FS4-7B requirements.

6.How does Aetrix verify that AP7343D-14FS4-7B is sourced from the original manufacturer or authorized distributors?

All AP7343D-14FS4-7B 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 AP7343D-14FS4-7B meets industry standards.

7.What is the process for return or replacement of AP7343D-14FS4-7B?

All AP7343D-14FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-14FS4-7B, 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 AP7343D-14FS4-7B part is unused and in its original packaging.

Return procedure for AP7343D-14FS4-7B:

1.Submit a request within 90 days.

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

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