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

Diodes Incorporated AP7340D-18FS4-7

Name: AP7340D-18FS4-7
Brand: Diodes Incorporated
SKU: AP7340D-18FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7340D-18FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7340D-18FS4-7.pdf

Description:: IC REG LINEAR 1.8V 150MA 4DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7340D-18FS4-7 from Diodes Incorporated is a 150mA low-dropout linear regulator with fixed 1.8V output, ±1% accuracy over -40°C to +85°C, 75dB PSRR at 1kHz, 60µV_RMS output noise (10Hz–100kHz), and 35µA quiescent current - designed for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7340D-18FS4-7 datasheet, AP7340D-18FS4-7 pinout, AP7340D-18FS4-7 application, or AP7340D-18FS4-7 equivalent, key selection criteria include dropout voltage at 150mA (0.21–0.27V), enable threshold compatibility (V_EN(H) ≥1.3V), thermal performance in X2-DFN1010-4, and built-in auto-discharge functionality.

Technical Context

The AP7340D integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active pull-down transistor for output discharge during shutdown. Its architecture supports fast load transient response (<100µs settling) and stable operation with 0.47µF ceramic input/output capacitors.

Unlike the non-discharge AP7340 variant, the 'D' suffix denotes an integrated 30Ω N-channel discharge FET between VOUT and GND when EN = 0V, ensuring rapid output voltage decay (<100µs) to prevent back-powering of downstream circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8V ±1% (±1.5% over full temperature range) - ensures stable core voltage for 1.8V I/O interfaces and RF ICs.
Max Output Current	150mA continuous - sufficient for powering single-band RF transceivers or camera sensor bias rails.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails.
Output Noise	60µV_RMS (10Hz–100kHz) - preserves signal integrity in sensitive analog front-ends like LNA or ADC reference supplies.
Quiescent Current	35µA typical - enables ultra-low-power standby modes in battery-operated handheld devices.
Dropout Voltage	0.21–0.27V at 150mA - allows operation from 2.0V input (e.g., single Li-ion cell post-regulation) while maintaining regulation.
Enable Threshold	V_EN(H) ≥1.3V, V_EN(L) ≤0.5V - compatible with 1.8V GPIO control without level-shifting.

Pinout & Package

AP7340D-18FS4-7 uses the X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm pitch) package with exposed thermal pad. PCB layout requires direct connection of the thermal pad to GND plane for optimal thermal dissipation (θ_JA ≈ 220°C/W on JEDEC High-K board).

Pin/Terminal	Circuit Role	Design Meaning
VOUT (Pin 1)	Regulated power output	Delivers clean 1.8V to load; must be decoupled with 0.47µF ceramic capacitor placed <1mm from pin.
GND (Pin 2)	Power ground reference	Primary return path for load current and internal bias; connects to thermal pad for heat sinking.
EN (Pin 3)	Active-high enable control	Drives regulator ON/OFF; floating state prohibited - tie to VIN if unused.
VIN (Pin 4)	Unregulated input supply	Accepts 1.7–5.25V; requires 0.47µF ceramic decoupling capacitor adjacent to pin.

Key Features

Feature	Design Value
Integrated auto-discharge	30Ω pull-down FET activates at EN=0V, discharging VOUT to <0.1V within 100µs - prevents backfeed into powered-down circuits.
Ultra-low noise output	60µV_RMS noise floor enables use in RF supply chains where phase noise or SNR degradation must be minimized.
High PSRR at audio frequencies	75dB rejection at 1kHz suppresses ripple from buck converter switching harmonics near 1–2MHz fundamental.
Wide input voltage range	1.7–5.25V operation supports direct connection to single-cell Li-ion (2.7–4.2V), USB (4.75–5.25V), or intermediate 3.3V rails.
Thermal protection	Fold-back current limiting triggers at ~55mA short-circuit current, preventing thermal runaway during sustained overload.

Applications

RF Transceiver Power

Camera Sensor Bias

Use Scenario: Supplying 1.8V bias to LTE/5G front-end modules requiring low-noise, fast-transient response.

IC Role / Device Role / Timing Role: Primary LDO for RF IC VDDIO rail, providing regulated voltage independent of baseband processor supply fluctuations.

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

Use Scenario: Powering CIS image sensor analog blocks (ADC reference, pixel array bias) in smartphone rear cameras.

IC Role / Device Role / Timing Role: Low-noise analog supply LDO with fast load step recovery to maintain image uniformity during exposure transitions.

Use Value: 60µV_RMS noise prevents fixed-pattern noise (FPN) and banding artifacts in high-resolution video capture.

Portable Media Player Audio

Wireless Adapter Core Logic

Use Scenario: Delivering clean 1.8V to DAC/codec digital I/O interfaces in Bluetooth headphones and portable speakers.

IC Role / Device Role / Timing Role: Isolated logic-level supply decoupled from noisy system rail, enabling glitch-free I²S data transfer.

Use Value: ±1% output accuracy ensures consistent logic threshold margins across temperature, preventing interface timing violations.

Use Scenario: Providing 1.8V core voltage to Wi-Fi/BT SoC I/O banks in USB dongles and IoT edge nodes.

IC Role / Device Role / Timing Role: Enable-controlled power domain sequencer for low-power sleep/wake cycles in battery-constrained adapters.

Use Value: 35µA quiescent current extends battery life in always-on listening mode; EN pin allows firmware-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
MCP1700-1802E/TO	Same 1.8V output, but only 250mA rating and no enable pin; 65dB PSRR at 1kHz; no auto-discharge.	Lacks EN control and discharge function - unsuitable for systems requiring precise power sequencing or backfeed prevention.	Select only if enable/discharge is unnecessary and higher output current margin is required.
Torex XC6206P182MR-G	1.8V ±2% accuracy, 150mA, 50µA IQ, no enable pin, no discharge; 60dB PSRR at 1kHz.	Lower PSRR and no enable/disable capability - limits use in noise-sensitive RF or dynamically powered systems.	Consider only for cost-sensitive, static-power applications where noise and sequencing are secondary.

Compared with MCP1700-1802E/TO and XC6206P182MR-G, AP7340D-18FS4-7 uniquely combines 1.8V precision, enable control, auto-discharge, and industry-leading 75dB PSRR - making it optimal for RF and portable imaging power domains where noise, sequencing, and space constraints converge.

Availability

AP7340D-18FS4-7 is available at Aetrix Electronics and suitable for RF transceiver power, camera sensor bias, portable media player audio, and wireless adapter core logic requiring stable component supply, tight voltage tolerance, and low-noise regulation.

Supply support for AP7340D-18FS4-7 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 solutions for power management, signal integrity, and connectivity applications.

The AP7340 series belongs to Diodes' high-PSRR, low-noise LDO portfolio engineered specifically for portable wireless and imaging systems demanding minimal footprint, ultra-low IQ, and robust transient immunity.

FAQ

What is the purpose of the 'D' suffix in AP7340D-18FS4-7?

The 'D' denotes integrated auto-discharge functionality: when the EN pin is pulled low, a 30Ω internal N-channel FET actively pulls VOUT to GND, discharging output capacitance within 100µs. This prevents back-powering of downstream circuitry during shutdown - critical in multi-rail portable systems.

Can AP7340D-18FS4-7 operate from a single Li-ion cell?

Yes - its 1.7V minimum input voltage and 0.21–0.27V dropout at 150mA allow stable 1.8V output down to ~2.0V input, covering the usable discharge range (3.0–2.0V) of a single Li-ion cell without requiring pre-regulation.

How does the X2-DFN1010-4 package impact thermal performance?

The 1.0mm × 1.0mm X2-DFN1010-4 package features an exposed thermal pad that must be soldered to a GND copper pour. With proper PCB layout (≥100mm² GND area), junction-to-ambient thermal resistance drops to ~160°C/W - enabling 150mA operation at +85°C ambient without derating.

Is external compensation required for stability?

No - AP7340D-18FS4-7 is internally compensated and stable with 0.47µF ceramic input and output capacitors. The datasheet confirms stability across 0.47–10µF COUT values and ESR <100mΩ, eliminating need for external RC networks or tantalum capacitors.

AP7340D-18FS4-7 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):: 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.42V @ 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

AP7340D-18FS4-7 FAQ

1.How can I place an order for AP7340D-18FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7340D-18FS4-7 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 AP7340D-18FS4-7 reliable?

The price and inventory of AP7340D-18FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7340D-18FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7340D-18FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7340D-18FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7340D-18FS4-7?

AP7340D-18FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7340D-18FS4-7 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 AP7340D-18FS4-7?

For technical support, including AP7340D-18FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7340D-18FS4-7 requirements.

6.How does Aetrix verify that AP7340D-18FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7340D-18FS4-7 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 AP7340D-18FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7340D-18FS4-7?

All AP7340D-18FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7340D-18FS4-7, 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 AP7340D-18FS4-7 part is unused and in its original packaging.

Return procedure for AP7340D-18FS4-7:

1.Submit a request within 90 days.

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

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