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

Diodes Incorporated AP7343-15FS4-7B

Name: AP7343-15FS4-7B
Brand: Diodes Incorporated
SKU: AP7343-15FS4-7B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7343-15FS4-7B

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7343-15FS4-7B.pdf

Description:: IC REG LINEAR 1.5V 300MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,288

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Product details

Overview

AP7343-15FS4-7B from Diodes Incorporated is a 300mA, 1.5V fixed-output low-dropout regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz), designed for RF supply rails in compact portable electronics using the X2-DFN1010-4 (Type B) package.

For engineers reviewing the AP7343-15FS4-7B datasheet, AP7343-15FS4-7B pinout, AP7343-15FS4-7B application, or AP7343-15FS4-7B equivalent, key selection criteria include its 35µA quiescent current, 0.39V typical dropout at 300mA (V_OUT = 1.5V), enable-controlled shutdown, and thermal shutdown at +150°C - all critical for battery-powered RF subsystems requiring stable, low-noise bias.

Technical Context

The AP7343-15FS4-7B implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current limit circuit, and thermal shutdown. Its EN pin provides precise on/off control with 0–0.5V logic-low threshold and 1.3–5.25V logic-high range, enabling system-level power sequencing.

It delivers regulated 1.5V output across 1.7–5.25V input range, maintains ±30ppm/°C output voltage temperature coefficient, and features fold-back short-circuit protection clamping output current to ~55mA during V_OUT-to-GND fault conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.5V ±1% at +25°C; ensures stable bias for RF ICs without external feedback network.
Max Output Current	300mA continuous; supports moderate-power RF front-end stages and baseband processors.
PSRR	75dB at 1kHz; suppresses switching noise from adjacent DC-DC converters feeding noisy power domains.
Output Noise	60µV_rms (10Hz–100kHz); minimizes phase noise degradation in VCOs and LNAs.
Quiescent Current	35µA typical; extends battery life in always-on RF monitoring or low-duty-cycle wireless sensors.
Dropout Voltage	0.39V max at 300mA (V_OUT = 1.5V); enables operation from single-cell Li-ion (3.0–4.2V) with >1.5V headroom margin.
Enable Threshold	V_IL ≤ 0.5V, V_IH ≥ 1.3V; compatible with 1.8V/3.3V GPIO without level-shifting.

Pinout & Package

AP7343-15FS4-7B uses the X2-DFN1010-4 (Type B) 1.0mm × 1.0mm, 0.4mm pitch, 4-pin package with exposed thermal pad (EP). The EP must be connected to PCB ground plane for optimal thermal performance (R_θJB = 85.7°C/W).

Pin/Terminal	Circuit Role	Design Meaning
PIN1 (VOUT)	Regulated Power Output	Delivers clean 1.5V to load; requires local 1µF ceramic capacitor placed adjacent to pin for stability and transient response.
PIN2 (GND)	Analog/Digital Ground Reference	Primary return path for output current and internal circuitry; must connect directly to low-impedance ground plane.
PIN3 (EN)	Active-High Enable Control	Drives regulator ON when ≥1.3V; pulls into shutdown (I_STANDBY ≤ 1.0µA) when ≤0.5V; must not float.
PIN4 (VIN)	Unregulated Input Supply	Accepts 1.7–5.25V input; requires 0.47µF ceramic decoupling capacitor placed within 2mm of pin to suppress supply glitches.
EP (Exposed Pad)	Thermal Dissipation Path	Not electrically functional; soldered to GND copper area to reduce junction-to-board thermal resistance by 40% vs. no-pad layout.

Key Features

Feature	Design Value
Low-noise regulation	60µV_rms output noise enables direct powering of sensitive RF analog blocks without additional filtering.
High PSRR at audio frequencies	75dB rejection at 1kHz mitigates ripple from buck converter switching harmonics in shared power rails.
Ultra-low quiescent current	35µA I_Q allows use in always-on wake-up circuits where standby power budget is <100µW.
Thermal and short-circuit protection	+150°C thermal shutdown with +20°C hysteresis and fold-back current limiting prevent damage during sustained overload.
Small-footprint packaging	X2-DFN1010-4 (1.0×1.0mm) reduces PCB area by 75% vs. SOT25, enabling high-density RF module layouts.

Applications

RF Transceiver Power Rail

Camera Sensor Bias Supply

Use Scenario: Providing clean 1.5V bias to LTE/5G transceiver RFICs in smartphones where PMIC output noise couples into LO paths.

IC Role / Device Role / Timing Role: Primary low-noise LDO delivering regulated VDD_RF to transceiver analog core and synthesizer blocks.

Use Value: 60µV_rms noise and 75dB PSRR prevent EVM degradation and maintain ACLR compliance under dynamic load.

Use Scenario: Powering high-resolution CMOS image sensor analog front-end (AFE) and PLL in mobile camera modules.

IC Role / Device Role / Timing Role: Fixed 1.5V LDO supplying sensor pixel array bias and clock generation circuitry.

Use Value: ±1% output accuracy ensures consistent ADC reference scaling; low dropout enables operation from shared 2.8V rail.

Wireless Audio Codec Supply

Low-Power IoT Sensor Node Core

Use Scenario: Delivering ultra-low-noise 1.5V to Bluetooth audio codec DAC and headphone driver in true wireless earbuds.

IC Role / Device Role / Timing Role: Dedicated LDO isolating sensitive audio signal chain from noisy digital SoC domain.

Use Value: 35µA quiescent current extends battery runtime in multi-day wear scenarios; fast load transient response prevents pop/click artifacts.

Use Scenario: Regulating 1.5V for ARM Cortex-M0+ MCU core and BLE radio in coin-cell-powered environmental sensors.

IC Role / Device Role / Timing Role: Main system LDO enabling deep-sleep mode with EN pin controlled by microcontroller GPIO.

Use Value: 1.0µA shutdown current and 0.39V dropout maximize usable battery voltage range from 2.0V down to 1.6V.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-1502E/TT	250mA max output, 6µV_rms noise (10Hz–100kHz), 6V max input, SOT23-5 package	Lacks enable pin; fixed 1.5V output but no shutdown control; higher noise floor unsuitable for RF	Select only for cost-sensitive, non-RF applications where enable control and ultra-low noise are unnecessary.
Torex XC6210B152MR-G	300mA output, 40µV_rms noise, 6V max input, SOT-25 package, 1.0µA shutdown current	SOT-25 footprint (larger than X2-DFN1010-4); slightly lower noise but no thermal shutdown hysteresis spec	Prefer when board space permits larger package and sub-40µV_rms noise is prioritized over thermal robustness.

Compared with MCP1700T-1502E/TT and XC6210B152MR-G, the AP7343-15FS4-7B uniquely balances RF-grade noise performance, enable functionality, thermal safety margin, and ultra-compact packaging - making it optimal for space-constrained, battery-powered RF systems demanding both precision and reliability.

Availability

AP7343-15FS4-7B is available at Aetrix Electronics and suitable for RF transceiver power rails, camera sensor bias supplies, wireless audio codec regulation, and low-power IoT sensor node cores requiring stable component supply with guaranteed long-term availability.

Supply support for AP7343-15FS4-7B 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 high-performance power management, signal integrity, and connectivity solutions for consumer, industrial, and automotive markets.

The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive RF and imaging applications in portable electronics where small size and low quiescent current are mandatory.

FAQ

What is the maximum allowable input voltage for AP7343-15FS4-7B?

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 6.0V risks permanent damage per Absolute Maximum Ratings.

Does AP7343-15FS4-7B include output discharge functionality?

No - the "7B" suffix indicates the non-discharge variant. Unlike AP7343D-15FS4-7B, this part lacks an internal NMOS discharge switch between VOUT and GND. When disabled via EN, output voltage decays only through external load or leakage, not active pull-down.

Can AP7343-15FS4-7B be used with ceramic output capacitors smaller than 1µF?

Yes - the device is stable with ≥0.47µF ceramic capacitors. However, 1µF is recommended for optimal transient response under 300mA load steps; smaller values increase output voltage deviation during fast load changes per Load Transient Response data.

How does thermal performance differ between X2-DFN1010-4 and SOT25 packages?

X2-DFN1010-4 has R_θJA = 237°C/W vs. SOT25's 179°C/W, meaning the smaller package runs hotter at same power dissipation. However, its exposed pad lowers R_θJB to 85.7°C/W (vs. 79.2°C/W for SOT25), making it superior for PCBs with large ground planes despite higher ambient thermal resistance.

AP7343-15FS4-7B 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):: 1.5V

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

AP7343-15FS4-7B FAQ

1.How can I place an order for AP7343-15FS4-7B through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7343-15FS4-7B 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 AP7343-15FS4-7B reliable?

The price and inventory of AP7343-15FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343-15FS4-7B is usually 5 days.

3.What payment methods are accepted for AP7343-15FS4-7B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343-15FS4-7B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7343-15FS4-7B?

AP7343-15FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7343-15FS4-7B 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 AP7343-15FS4-7B?

For technical support, including AP7343-15FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343-15FS4-7B requirements.

6.How does Aetrix verify that AP7343-15FS4-7B is sourced from the original manufacturer or authorized distributors?

All AP7343-15FS4-7B 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 AP7343-15FS4-7B meets industry standards.

7.What is the process for return or replacement of AP7343-15FS4-7B?

All AP7343-15FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7343-15FS4-7B, 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 AP7343-15FS4-7B part is unused and in its original packaging.

Return procedure for AP7343-15FS4-7B:

1.Submit a request within 90 days.

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

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