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

Diodes Incorporated AP7340-31FS4-7

Name: AP7340-31FS4-7
Brand: Diodes Incorporated
SKU: AP7340-31FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7340-31FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7340-31FS4-7.pdf

Description:: IC REG LINEAR 3.1V 150MA 4DFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,296

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Product details

Overview

AP7340-31FS4-7 from Diodes Incorporated is a 3.1V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_RMS output noise (10Hz–100kHz). Built on a CMOS process, it features enable control, low 35µA quiescent current, and operates from 1.7V to 5.25V input - optimized for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7340-31FS4-7 datasheet, AP7340-31FS4-7 pinout, AP7340-31FS4-7 application, or AP7340-31FS4-7 equivalent, key selection criteria include dropout voltage at 150mA (0.21–0.27V), EN logic thresholds (0.5V_IL/1.3V_IH), thermal performance in X2-DFN1010-4, and compatibility with 0.47µF ceramic input/output capacitors.

Technical Context

The AP7340-31FS4-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and CMOS pass transistor - enabling stable regulation with fast line/load transient response. Its non-discharge architecture avoids automatic VOUT discharge during shutdown, preserving downstream capacitor charge.

Designed for low-noise biasing, it delivers 60µV_RMS noise over 10Hz–100kHz and achieves 75dB power supply rejection at 1kHz due to high-gain error amplifier and optimized internal compensation - eliminating need for external compensation components.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.1V ±1% at +25°C; ±1.5% over –40°C to +85°C - ensures stable core/bias rail for RF ICs and sensors.
Max Output Current	150mA guaranteed - sufficient for powering single-band RF transceivers or camera sensor analog blocks.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding noisy system rails.
Output Noise	60µV_RMS (10Hz–100kHz) - meets stringent noise requirements for RF front-end and ADC reference supplies.
Quiescent Current	35µA typical - enables multi-day battery life in always-on sensor or standby-mode wireless modules.
Dropout Voltage	0.21–0.27V at 150mA (for 3.1V VOUT) - allows operation from single-cell Li-ion (3.0V min) with margin.
Enable Thresholds	V_{EN_H} ≥1.3V, V_{EN_L} ≤0.5V - compatible with 1.8V/3.3V GPIO without level-shifting.

Pinout & Package

The AP7340-31FS4-7 is housed in a 1.0mm × 1.0mm, 0.4mm height X2-DFN1010-4 package with exposed thermal pad - optimized for ultra-dense portable PCB layouts and thermal dissipation via PCB copper area connected to GND.

Pin/Terminal	Circuit Role	Design Meaning
VOUT (Pin 1)	Regulated Power Output	Delivers clean 3.1V to load; requires 0.47µF ceramic capacitor placed adjacent to pin for stability and transient response.
GND (Pin 2)	Power Ground Reference	Primary return path for output current; must connect directly to low-impedance ground plane to minimize noise coupling.
EN (Pin 3)	Logic-Controlled Enable Input	Active-high digital control: >1.3V enables regulation; <0.5V forces shutdown with 0.01µA standby current.
VIN (Pin 4)	Unregulated Input Supply	Accepts 1.7–5.25V; requires 0.47µF decoupling capacitor near pin to suppress input ripple and maintain PSRR performance.

Key Features

Feature	Design Value
Ultra-Low Output Noise	60µV_RMS (10Hz–100kHz) - eliminates need for post-regulation filtering in sensitive RF/analog signal chains.
High PSRR at Low Frequencies	75dB at 1kHz - rejects noise from PMIC switchers operating at ~1MHz and their harmonics.
Low Quiescent Current	35µA typical - extends battery runtime in always-on IoT edge nodes without compromising regulation accuracy.
Precision Fixed Output	±1% initial accuracy at +25°C - reduces calibration overhead in factory programming of portable devices.
Small Footprint Package	X2-DFN1010-4 (1.0mm × 1.0mm) - saves >60% board area vs. SOT-23 while maintaining thermal performance via thermal pad.

Applications

RF Transceiver Power

Camera Sensor Bias

Use Scenario: Powering 2.4GHz BLE/Wi-Fi transceiver ICs requiring clean 3.1V supply with minimal switching noise coupling.

IC Role / Device Role / Timing Role: Primary LDO supplying VDD_RF rail; regulates against ripple from shared system DC/DC converter.

Use Value: 75dB PSRR prevents TX EVM degradation; 60µV_RMS noise avoids RX sensitivity loss in narrowband receivers.

Use Scenario: Providing analog bias voltage to CMOS image sensor's PLL and analog front-end circuits.

IC Role / Device Role / Timing Role: Low-noise post-regulator for sensor analog supply; replaces noisier switching solutions.

Use Value: 60µV_RMS noise prevents fixed-pattern noise in captured images; ±1% accuracy maintains consistent gain calibration.

Wireless Adapter Core

Portable Media Player Audio

Use Scenario: Supplying 3.1V to baseband processor I/O or memory interface in USB wireless dongles.

IC Role / Device Role / Timing Role: Stable I/O rail regulator enabling reliable high-speed data transfer between host and adapter.

Use Value: 150mA output supports burst-mode data transfers; 0.21V dropout allows operation down to 3.0V battery voltage.

Use Scenario: Powering DAC and headphone amplifier stages in battery-powered media players.

IC Role / Device Role / Timing Role: Low-noise analog supply for audio signal path; enabled only during playback to conserve power.

Use Value: 35µA quiescent current minimizes standby drain; EN pin enables precise software-controlled power gating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-3102E/TO	3.1V fixed, 250mA, 6µA IQ, TO-92 package - higher current but larger footprint and no enable pin.	Lacks EN control and compact DFN packaging - unsuitable for space-constrained wireless modules.	Select only if board space permits TO-92 and enable functionality is unnecessary.
Torex XC6206P312MR-G	3.1V fixed, 250mA, 1.0µA IQ, SOT-25 - lower IQ but 45dB PSRR at 1kHz and no thermal pad.	Lower PSRR compromises RF noise immunity; SOT-25 limits thermal handling under 150mA continuous load.	Prefer only for ultra-low-power sensor nodes where RF performance is secondary to standby current.

Compared with MCP1700-3102E/TO and XC6206P312MR-G, the AP7340-31FS4-7 uniquely balances RF-grade PSRR (75dB), ultra-low noise (60µV_RMS), enable control, and thermally robust 1.0mm² DFN packaging - making it optimal for miniaturized wireless endpoints demanding both efficiency and signal integrity.

Availability

AP7340-31FS4-7 is available at Aetrix Electronics and suitable for RF transceiver power, camera sensor bias, wireless adapter core, and portable media player audio applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AP7340-31FS4-7 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-reliability power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.

The AP7340 series belongs to Diodes' high-PSRR, low-noise LDO product line - engineered specifically for noise-sensitive analog and RF subsystems in battery-powered portable electronics.

FAQ

What is the minimum input voltage required for AP7340-31FS4-7 to regulate 3.1V at 150mA?

The minimum input voltage is determined by dropout: 3.1V + 0.27V = 3.37V maximum dropout at 150mA and +25°C. Per datasheet, VIN must be ≥1.7V, but functional regulation at full load requires VIN ≥3.37V. At lighter loads, regulation sustains down to VIN = 3.1V + 0.21V = 3.31V.

Can AP7340-31FS4-7 be used without an external enable signal?

Yes. The EN pin can be permanently tied to VIN to maintain continuous operation. This configuration eliminates external control but retains all regulation features. Ensure the connection uses a low-impedance trace to avoid noise coupling into the enable threshold detection circuit.

Is a thermal pad connection required for reliable operation at 150mA?

Yes. The X2-DFN1010-4 package includes an exposed thermal pad that must be soldered to a PCB copper area connected to GND. Without this, junction temperature rise exceeds safe limits under 150mA load at ambient >60°C, risking thermal shutdown or accelerated parametric drift.

Does AP7340-31FS4-7 include short-circuit protection?

Yes. When VOUT is shorted to GND, the device limits output current to approximately 55–60mA (typical), preventing damage and excessive self-heating. This fold-back current limit remains active until the fault is removed and EN is cycled or VIN is reset.

AP7340-31FS4-7 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):: 5.25V

Voltage - Output (Min/Fixed):: 3.1V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.27V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 50 µA

Current - Supply (Max):: 100 µA

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

AP7340-31FS4-7 FAQ

1.How can I place an order for AP7340-31FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7340-31FS4-7 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 AP7340-31FS4-7 reliable?

The price and inventory of AP7340-31FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7340-31FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7340-31FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7340-31FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7340-31FS4-7?

AP7340-31FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7340-31FS4-7 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 AP7340-31FS4-7?

For technical support, including AP7340-31FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7340-31FS4-7 requirements.

6.How does Aetrix verify that AP7340-31FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7340-31FS4-7 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 AP7340-31FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7340-31FS4-7?

All AP7340-31FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7340-31FS4-7, 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 AP7340-31FS4-7 part is unused and in its original packaging.

Return procedure for AP7340-31FS4-7:

1.Submit a request within 90 days.

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

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