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

Diodes Incorporated AP7341D-135FS4-7

Name: AP7341D-135FS4-7
Brand: Diodes Incorporated
SKU: AP7341D-135FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7341D-135FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7341D-135FS4-7.pdf

Description:: IC REG LINEAR 1.35V 300MA 4DFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7341D-135FS4-7 from Diodes Incorporated is a 300mA, 1.35V fixed-output low-dropout linear regulator (LDO) with high PSRR (75dB at 1kHz), ultra-low output noise (60µV_rms, 10Hz–100kHz), ±1% output voltage accuracy, and 35µA quiescent current. It operates from 1.7V to 5.25V input and features enable control, short-circuit protection, and thermal shutdown-designed for RF supply rails in compact portable devices.

For engineers reviewing the AP7341D-135FS4-7 datasheet, AP7341D-135FS4-7 pinout, AP7341D-135FS4-7 application, or AP7341D-135FS4-7 equivalent, key selection criteria include dropout voltage at 300mA (0.50V typ. @1.35V_OUT), EN logic thresholds (0.5V_IL/1.3V_IH), thermal pad grounding guidance, and compatibility with 1µF ceramic input/output capacitors.

Technical Context

The AP7341D-135FS4-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its enable input directly controls NMOS pass transistor gate bias, enabling fast turn-on/turn-off transitions (<10µs typical) and <1µA standby current when disabled.

It delivers stable 1.35V output across −40°C to +85°C ambient, with load regulation of ≤30mV from 1mA to 300mA and line regulation of ≤0.1%/V. The device includes fold-back short-circuit protection limiting output current to ~55mA under V_OUT short-to-GND conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.35V ±1% at 25°C; ±1.5% over full temperature range - ensures stable core/bias rail for low-voltage analog or RF ICs.
Max Output Current	300mA continuous - supports power delivery to multiple low-power peripherals (e.g., camera sensor, RF transceiver section).
PSRR	75dB at 1kHz - suppresses switching noise from upstream DC-DC converters feeding noisy system rails.
Output Noise	60µV_rms (10Hz–100kHz) - minimizes phase noise degradation in RF local oscillator or ADC reference paths.
Quiescent Current	35µA typical - extends battery life in always-on sensor or standby-mode subsystems.
Dropout Voltage	0.50V max at 150mA (1.35V_OUT) - enables operation from single-cell Li-ion (3.0V min) or 2xAA alkaline (2.4V min) with margin.
Enable Thresholds	V_IL ≤ 0.5V, V_IH ≥ 1.3V - compatible with 1.8V/3.3V GPIO without level-shifting.

Pinout & Package

The AP7341D-135FS4-7 is housed in a 1.0mm × 1.0mm X2-DFN1010-4 package with exposed thermal pad. PCB layout requires direct connection of the thermal pad to a large GND copper area for optimal thermal dissipation (θ_JA ≈ 220°C/W on JEDEC High-K board).

Pin/Terminal	Circuit Role	Design Meaning
PIN1: VOUT	Regulated Power Output	Delivers clean 1.35V; must be decoupled with ≥1µF ceramic capacitor placed adjacent to pin.
PIN2: GND	Analog & Power Ground Reference	Primary return path for load current and internal circuitry; connects to thermal pad and system ground plane.
PIN3: EN	Digital Enable Control Input	Active-high logic input; floating state is undefined - must be tied to VIN or controlled by host MCU GPIO.
PIN4: VIN	Unregulated Input Supply	Accepts 1.7V–5.25V; requires ≥0.47µF ceramic decoupling capacitor placed within 2mm of pin.

Key Features

Feature	Design Value
Ultra-Low Quiescent Current	35µA typical - enables >1-year battery life in coin-cell-powered IoT sensors with periodic wake-up.
High PSRR at Low Frequencies	75dB @1kHz - rejects ripple from buck converter switching frequencies and their harmonics.
Low-Noise Output	60µV_rms (10Hz–100kHz) - preserves signal integrity in precision analog front-ends and RF synthesizers.
Thermal Shutdown & Short-Circuit Protection	Auto-recovery fold-back current limit (~55mA) and junction temperature cutoff (>150°C) - prevents damage during fault conditions.
Small Footprint Package	X2-DFN1010-4 (1.0×1.0mm, 0.4mm height) - saves >70% board area vs. SOT-23, critical for ultra-thin mobile designs.

Applications

RF Power Amplifier Bias

Camera Sensor Core Supply

Use Scenario: Providing stable 1.35V bias to GaAs pHEMT driver stages in 4G/5G front-end modules.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO delivering clean DC bias independent of PA switching transients.

Use Value: Reduces AM-to-PM distortion and improves EVM by suppressing 100kHz–1MHz supply-induced phase noise.

Use Scenario: Powering image sensor digital core logic (e.g., CIS pixel array controller) in smartphone rear cameras.

IC Role / Device Role / Timing Role: Fixed-output LDO supplying regulated 1.35V with fast load transient response to handle burst readout currents.

Use Value: Prevents frame corruption during high-speed rolling shutter exposure by maintaining <±1% V_OUT under 100mA step loads.

Wireless Adapter Baseband IC

Portable Media Player Audio Codec

Use Scenario: Supplying 1.35V to baseband processor I/O banks in Wi-Fi 6/Bluetooth 5.3 USB dongles.

IC Role / Device Role / Timing Role: Enable-controlled LDO allowing host PC to power-cycle baseband logic without resetting USB enumeration.

Use Value: Enables <10µs power-up sequencing and <1µA deep-sleep current, meeting USB suspend/resume timing budgets.

Use Scenario: Generating clean 1.35V for stereo audio DAC/ADC analog sections in flash-based MP3 players.

IC Role / Device Role / Timing Role: Low-noise LDO isolating sensitive audio circuitry from noisy system DC-DC outputs.

Use Value: Achieves >105dB SNR by limiting supply-induced broadband noise contribution to <0.5µV_rms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-1302E/MB	1.3V fixed output, 250mA max, 6µA IQ, 65dB PSRR @1kHz - lower current and PSRR, no thermal pad.	Suitable for ultra-low-power microcontroller peripherals but not RF bias where 300mA/75dB is required.	Select if IQ <10µA is mandatory and load current ≤200mA; avoid for RF or high-transient apps.
Torex XC6210B132MR-G	1.3V fixed output, 300mA, 25µA IQ, 70dB PSRR @1kHz, DFN1010-4 - slightly lower PSRR and no discharge FET.	Matches current capability but lacks auto-discharge; may cause hold-up issues in multi-rail systems requiring fast V_OUT decay.	Prefer for cost-sensitive consumer apps where discharge is unnecessary; verify system-level power-down timing.

Compared with MCP1700T-1302E/MB and XC6210B132MR-G, the AP7341D-135FS4-7 uniquely combines 300mA drive, 75dB PSRR, and 60µV_rms noise in a thermally enhanced 1mm² package-making it optimal for space-constrained RF and imaging subsystems demanding both performance and reliability.

Availability

AP7341D-135FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor core supply, wireless adapter baseband ICs, and portable media player audio codecs requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for AP7341D-135FS4-7 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-performance power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.

The AP7341 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive RF, imaging, and portable communication applications where supply rail purity directly impacts system-level signal fidelity.

FAQ

What is the minimum input voltage required for AP7341D-135FS4-7 to regulate 1.35V output at 300mA?

The minimum input voltage is determined by dropout voltage plus nominal output: at 300mA, typical dropout is 0.50V (max 0.62V per datasheet), so VIN ≥ 1.85V (1.35V + 0.50V) ensures regulation. Below this, output drops linearly with input.

Does AP7341D-135FS4-7 include an output discharge function?

Yes-the "D" suffix indicates the discharge version: when EN is pulled low, an internal 30Ω NMOS switch connects VOUT to GND, discharging external capacitors rapidly. This prevents residual voltage from interfering with downstream power sequencing or causing latch-up.

Can AP7341D-135FS4-7 operate with only 0.47µF input capacitance?

Yes-the datasheet specifies a minimum 0.47µF ceramic capacitor between VIN and GND. However, for optimal transient suppression and stability under dynamic loads, 1.0µF is recommended and validated in the typical application circuit.

How should the thermal pad on the X2-DFN1010-4 package be connected?

The exposed thermal pad must be soldered to a dedicated GND copper pour on the PCB. Diodes recommends connecting it directly to the main system ground plane using ≥4 thermal vias (0.3mm diameter) to inner-layer GND planes to achieve θ_JA < 200°C/W in production layouts.

AP7341D-135FS4-7 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):: 1.35V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.62V @ 150mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 50 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

AP7341D-135FS4-7 FAQ

1.How can I place an order for AP7341D-135FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7341D-135FS4-7 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 AP7341D-135FS4-7 reliable?

The price and inventory of AP7341D-135FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7341D-135FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7341D-135FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7341D-135FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7341D-135FS4-7?

AP7341D-135FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7341D-135FS4-7 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 AP7341D-135FS4-7?

For technical support, including AP7341D-135FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7341D-135FS4-7 requirements.

6.How does Aetrix verify that AP7341D-135FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7341D-135FS4-7 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 AP7341D-135FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7341D-135FS4-7?

All AP7341D-135FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7341D-135FS4-7, 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 AP7341D-135FS4-7 part is unused and in its original packaging.

Return procedure for AP7341D-135FS4-7:

1.Submit a request within 90 days.

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

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