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 AP7343-11FS4-7B

Name: AP7343-11FS4-7B
Brand: Diodes Incorporated
SKU: AP7343-11FS4-7B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AP7343-11FS4-7B

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7343-11FS4-7B.pdf

Description:: IC REG LINEAR 1.1V 300MA 4DFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,751

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

Product details

Overview

AP7343-11FS4-7B from Diodes Incorporated is a 300mA, 1.1V fixed-output low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). Built on CMOS process, it features enable control, thermal shutdown, and short-circuit protection, and is optimized for RF supply rails in compact portable electronics.

For engineers reviewing the AP7343-11FS4-7B datasheet, AP7343-11FS4-7B pinout, AP7343-11FS4-7B application, or AP7343-11FS4-7B equivalent, key selection criteria include its 1.7V–5.25V input range, ultra-low 35µA quiescent current, X2-DFN1010-4 (Type B) package footprint, and guaranteed 300mA output under tight dropout constraints.

Technical Context

The AP7343-11FS4-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and CMOS pass transistor - enabling stable regulation with fast line/load transient response. Its EN pin provides precise on/off control with defined logic thresholds (V_EN(H) ≥ 1.3V, V_EN(L) ≤ 0.5V), and internal thermal shutdown activates at +150°C with +20°C hysteresis.

Designed for noise-sensitive analog and RF subsystems, it delivers high PSRR (75dB @ 1kHz) and low output noise without requiring external compensation. The device supports ceramic output capacitors as small as 1µF and operates across –40°C to +85°C ambient, with junction temperature rated to +125°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.1V ±1% at +25°C; ensures stable core bias for low-voltage logic and RF ICs
Max Output Current	300mA continuous; sufficient for powering baseband processors or RF front-end modules
Input Voltage Range	1.7V to 5.25V; compatible with single-cell Li-ion, Li-poly, or regulated 3.3V/5V rails
PSRR	75dB at 1kHz; suppresses switching noise from adjacent DC-DC converters in mixed-signal PCBs
Output Noise	60µV_rms (10Hz–100kHz); minimizes phase noise impact on VCOs and PLLs
Quiescent Current	35µA typical; extends battery life in always-on sensor or standby communication circuits
Dropout Voltage	0.46V max at 300mA (V_OUT = 1.1V); enables operation down to ~1.56V input, critical for fading battery conditions

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, exposed thermal pad (EP) - requires PCB copper area connected to GND for optimal thermal dissipation (R_θJA = 237°C/W).

Pin/Terminal	Circuit Role	Design Meaning
PIN1 (VOUT)	Regulated power output	Delivers clean 1.1V to load; must be decoupled with ≥1µF ceramic capacitor placed adjacent to pin
PIN2 (GND)	Power ground reference	Primary return path for output current; connects to system ground plane to minimize noise coupling
PIN3 (EN)	Enable control input	Active-high logic input; drives regulator ON when ≥1.3V, OFF when ≤0.5V; must not float
PIN4 (VIN)	Unregulated input supply	Accepts 1.7–5.25V; requires ≥0.47µF ceramic decoupling capacitor placed near pin to suppress supply transients
EP (Exposed Pad)	Thermal conduction path	Not electrically functional; soldered to large GND copper pour to reduce junction temperature rise

Key Features

Feature	Design Value
Ultra-low quiescent current	35µA typical enables >1-year battery life in low-duty-cycle IoT sensors
High PSRR at audio frequencies	75dB rejection at 1kHz prevents audible noise coupling into audio codecs or DACs
Low-noise output	60µV_rms noise floor preserves SNR in RF receivers and precision ADC references
Robust thermal protection	+150°C shutdown with +20°C hysteresis prevents latch-up during sustained overload or poor heatsinking
Small-footprint packaging	X2-DFN1010-4 (1.0×1.0mm) reduces PCB area by >60% vs. SOT25, supporting ultra-dense mobile layouts

Applications

RF Power Amplifier Bias

Low-Voltage Microcontroller Core

Use Scenario: Providing clean, stable bias to GaAs or SiGe RF power amplifiers in LTE/Wi-Fi front-ends.

IC Role / Device Role / Timing Role: LDO regulator delivering 1.1V at up to 300mA with minimal ripple-induced AM-to-PM distortion.

Use Value: 75dB PSRR suppresses switching noise from PMIC DC-DC converters, preserving EVM and ACLR performance.

Use Scenario: Supplying core voltage to ARM Cortex-M0+/M4 microcontrollers in wearables and edge nodes.

IC Role / Device Role / Timing Role: Primary low-noise power source for digital logic domain, enabling sub-100ns wake-from-sleep timing.

Use Value: 35µA quiescent current and fast enable response (<200µs turn-on) extend battery runtime in intermittent sensing modes.

Camera Image Sensor Analog Rail

Wireless Transceiver VDD_IO

Use Scenario: Powering analog pixel array and column ADC in CMOS image sensors for smartphones and drones.

IC Role / Device Role / Timing Role: Low-noise 1.1V supply isolating sensitive analog circuitry from digital switching noise.

Use Value: 60µV_rms output noise prevents fixed-pattern noise and quantization errors in 12-bit+ imaging pipelines.

Use Scenario: Regulating I/O voltage for Bluetooth 5.0, Zigbee, or proprietary 2.4GHz transceivers in compact modules.

IC Role / Device Role / Timing Role: Stable interface rail ensuring signal integrity across GPIO, SPI, and UART lines during burst transmission.

Use Value: ±1% output accuracy maintains logic threshold margins across temperature, preventing protocol timeouts or data corruption.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-1102E/TO	250mA max output, 6µA quiescent current, TO-92 package (larger footprint, higher R_θJA)	Limited to lower-current microcontrollers or sensors; unsuitable for RF PA bias	Select when ultra-low IQ dominates over output current and board space constraints
Torex XC6210B112MR-G	200mA output, 1.1V ±2% accuracy, SOT-25 package, no enable pin	Requires external enable circuitry; less precise output voltage affects logic margin in wide-temp designs	Choose only if enable functionality is unnecessary and cost is primary driver

Compared with MCP1700-1102E/TO and XC6210B112MR-G, the AP7343-11FS4-7B uniquely balances 300mA drive capability, ±1% accuracy, integrated enable, and 1.0×1.0mm footprint - making it the only option suitable for space-constrained, noise-sensitive, high-current RF and imaging subsystems.

Availability

AP7343-11FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier bias, low-voltage microcontroller core supplies, camera image sensor analog rails, and wireless transceiver I/O regulation requiring stable component supply across industrial, medical, and consumer production programs.

Supply support for AP7343-11FS4-7B 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design and manufacturing operations across Asia, Europe, and the Americas.

The AP7343 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for noise-critical portable electronics where PSRR, output noise, and ultra-small footprint are non-negotiable design requirements.

FAQ

What is the minimum input voltage required for stable 1.1V output at 300mA?

The AP7343-11FS4-7B requires VIN ≥ 1.56V to maintain regulation at 300mA load, based on its maximum dropout voltage of 0.46V at V_OUT = 1.1V. Below this, output collapses; operation is guaranteed from 1.7V per datasheet specifications.

Does the AP7343-11FS4-7B include output discharge functionality?

No - the "7B" suffix indicates the non-discharge variant. Unlike AP7343D-11FS4-7B, this part lacks an internal discharge FET; VOUT remains floating after EN is pulled low, requiring external bleed resistors for rapid voltage decay in safety-critical systems.

Can the AP7343-11FS4-7B be used with a 10µF tantalum output capacitor?

Yes, but only if ESR is within 0.01–0.1Ω range per the ESR vs. I_OUT stability graph. Tantalum caps often exceed this; ceramic capacitors (1–4.7µF, X5R/X7R) are preferred for guaranteed stability and lower noise.

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

X2-DFN1010-4 has R_θJA = 237°C/W versus SOT25's 179°C/W - meaning the DFN runs ~58°C hotter at same power dissipation. For 300mA at 1.7V input (0.6V dropout → 180mW), DFN junction rise is ~43°C above ambient, requiring careful thermal layout.

AP7343-11FS4-7B 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):: 1.1V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.7V @ 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

AP7343-11FS4-7B FAQ

1.How can I place an order for AP7343-11FS4-7B through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7343-11FS4-7B 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 AP7343-11FS4-7B reliable?

The price and inventory of AP7343-11FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343-11FS4-7B is usually 5 days.

3.What payment methods are accepted for AP7343-11FS4-7B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343-11FS4-7B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7343-11FS4-7B?

AP7343-11FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7343-11FS4-7B 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 AP7343-11FS4-7B?

For technical support, including AP7343-11FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343-11FS4-7B requirements.

6.How does Aetrix verify that AP7343-11FS4-7B is sourced from the original manufacturer or authorized distributors?

All AP7343-11FS4-7B 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 AP7343-11FS4-7B meets industry standards.

7.What is the process for return or replacement of AP7343-11FS4-7B?

All AP7343-11FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7343-11FS4-7B, 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 AP7343-11FS4-7B part is unused and in its original packaging.

Return procedure for AP7343-11FS4-7B:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…