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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Diodes Incorporated AP7368D-33RS4-7

Name: AP7368D-33RS4-7
Brand: Diodes Incorporated
SKU: AP7368D-33RS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7368D-33RS4-7

Manufacturer:: Diodes Incorporated

Category:: Special Purpose Regulators

Package:: 8-XFDFN Exposed Pad

Datasheet:: AP7368D-33RS4-7.pdf

Description:: LDO CMOS HiCurr X1-DFN1612-8 T&R

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7368D-33RS4-7 from Diodes Incorporated is a 500mA/1A low-noise RF LDO regulator in X1-DFN1612-8 (Type B) package, delivering fixed 3.3V output with ±1% accuracy, 80dB PSRR at 1kHz, and 16µV_rms output noise (10Hz–100kHz). It features dual current-limit selection (via LCON pin), 110µA quiescent current, and is optimized for RF supply rails in portable wireless devices.

For engineers reviewing the AP7368D-33RS4-7 datasheet, AP7368D-33RS4-7 pinout, AP7368D-33RS4-7 application, or AP7368D-33RS4-7 equivalent, key selection criteria include output noise performance, PSRR across RF bands, thermal resistance (θ_JA = 55.5°C/W), and LCON-configurable current limit for flexible power rail sizing in space-constrained handheld designs.

Technical Context

The AP7368D-33RS4-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and foldback short-circuit protection. Its dual current-limit capability (500mA/LCON=L or 1A/LCON=H) enables dynamic load adaptation without changing BOMs.

It supports fast line/load transient response via low R_DS(on) and stable operation with 1µF ceramic input/output capacitors. The VFB pin allows optional external feedback for adjustable variants, though this fixed 3.3V version uses internal resistor network for precision regulation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±1% over −40°C to +85°C - ensures stable logic-level supply for 3.3V I/O domains.
Max Output Current	Selectable: 500mA (LCON=L) or 1A (LCON=H) - enables single-part support for multiple load tiers.
PSRR	80dB at 1kHz (VOUT ≥ 1.8V) - suppresses switching noise from adjacent DC-DC converters in RF subsystems.
Output Noise	16µV_rms (10Hz–100kHz) - meets stringent spectral purity requirements for RF front-end biasing.
Quiescent Current	110µA typical - extends battery life in always-on wireless adapter and sensor modules.
Dropout Voltage	60mV at 3.3V/500mA - supports operation down to VIN = 3.36V, critical for Li-ion battery discharge tail.
Thermal Resistance	θ_JA = 55.5°C/W - enables >500mA continuous output in compact DFN1612 layout with minimal copper area.

Pinout & Package

X1-DFN1612-8 (Type B) package: 1.6mm × 1.2mm footprint, 0.4mm pitch, exposed thermal pad (EP) for enhanced heat dissipation. Requires PCB copper fill connected to GND for optimal thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1, 2 VOUT	Regulated output node	Dual-pin configuration lowers IR drop and improves current sharing for 1A operation.
3 LCON	Current limit select input	Logic-high sets 1A limit; logic-low sets 500mA - enables firmware-controlled power scaling.
4 VFB	Feedback reference node	Internally tied to 3.3V divider; accessible for external adjustment in non-fixed variants.
5 GND	Power ground reference	Primary return path for output current; must be low-impedance connection to PCB ground plane.
6 EN	Enable control input	Active-high logic interface (0–0.4V low, 1–5.5V high); no pull-up required.
7, 8 VDD	Input power supply	Dual-pin configuration reduces input trace inductance and improves PSRR at high frequencies.
EP	Exposed thermal pad	Not electrically functional; must be soldered to GND copper pour for θ_JA compliance.

Key Features

Feature	Design Value
Low-noise RF regulation	16µV_rms noise floor enables clean biasing of LNAs, mixers, and PLL VCOs without added filtering.
Configurable current limit	LCON pin selects 500mA or 1A output - eliminates need for separate BOMs for different load profiles.
Foldback short-circuit protection	Clamps to 60mA (LCON=L) or 110mA (LCON=H) during VOUT-to-GND fault - prevents thermal runaway in portable systems.
Ultra-low quiescent current	110µA operating IQ - supports >1-year shelf life in battery-backed IoT sensors with periodic wake-up.
High PSRR at RF frequencies	80dB @ 1kHz, maintained >75dB up to 100kHz - rejects noise from 2.4GHz/5GHz DC-DC switchers coupled through shared input rails.

Applications

Smartphone RF Front-End

Wireless Adapter Module

Use Scenario: Powering 3.3V LNA and PA driver stages in LTE/5G sub-6GHz transceivers.

IC Role / Device Role / Timing Role: Low-noise local LDO supplying bias voltage to RF amplifiers with minimal phase noise contribution.

Use Value: 16µV_rms noise and 80dB PSRR prevent AM-to-PM distortion and EVM degradation in 256-QAM transmission.

Use Scenario: Regulating 3.3V supply for Wi-Fi 6/6E baseband ICs and RF transceivers in USB dongles.

IC Role / Device Role / Timing Role: Primary post-regulator after buck converter, providing clean, stable voltage for digital PHY and analog RF sections.

Use Value: Dual current limit (500mA/1A) accommodates both idle and transmit burst modes without overdesigning thermal solution.

Portable Camera ISP

Bluetooth LE Audio Earbud

Use Scenario: Supplying image signal processor core and CIS analog block in compact camera modules.

IC Role / Device Role / Timing Role: Fixed-output LDO delivering precise 3.3V to noise-sensitive analog pixel readout circuitry.

Use Value: ±1% output accuracy maintains ADC reference stability; low dropout enables operation during Li-ion battery sag below 3.5V.

Use Scenario: Powering Bluetooth audio SoC and MEMS microphone bias in true wireless stereo earbuds.

IC Role / Device Role / Timing Role: Always-on LDO supporting ultra-low-power listening mode and burst-mode audio playback.

Use Value: 110µA quiescent current extends battery runtime in multi-day wear scenarios; small DFN1612 footprint saves PCB area.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6216D332MR-G	Fixed 3.3V, 500mA, 25µV_rms noise, no LCON current-select feature	Lacks configurable current limit; higher noise limits use in RF-sensitive nodes	Choose when board space permits larger SOT-25 and RF noise requirements are relaxed.
Richtek RT9080AL-33PU5	Fixed 3.3V, 1A, 20µV_rms noise, requires external EN pull-up resistor	No LCON pin; higher IQ (250µA) reduces battery life in always-on applications	Prefer where 1A fixed limit suffices and thermal margin exceeds 55.5°C/W requirement.

Compared with XC6216D332MR-G and RT9080AL-33PU5, the AP7368D-33RS4-7 uniquely combines 16µV_rms noise, LCON-configurable current limit, and 55.5°C/W thermal resistance in a 1.6mm × 1.2mm DFN - enabling smaller, quieter, and more adaptable RF power delivery in next-gen portable designs.

Availability

AP7368D-33RS4-7 is available at Aetrix Electronics and suitable for smartphone RF front-ends, wireless adapter modules, and portable camera ISPs requiring stable component supply with guaranteed long-term continuity.

Supply support for AP7368D-33RS4-7 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 connectivity solutions for consumer, industrial, and automotive markets.

The AP7368 series belongs to Diodes' low-noise RF LDO product line, engineered specifically for noise-critical wireless communication subsystems where PSRR, output noise, and compact packaging are primary design constraints.

FAQ

What is the function of the LCON pin on AP7368D-33RS4-7?

The LCON pin configures the output current limit: logic-high (≥1V) sets 1A, logic-low (≤0.4V) sets 500mA. It has 0.3µA pull-down current and does not require external biasing. This pin enables one BOM to serve multiple load profiles without redesigning power stages.

Can AP7368D-33RS4-7 operate with only a 1µF output capacitor?

Yes - the AP7368D-33RS4-7 is internally compensated and stable with a minimum 1µF ceramic output capacitor. Its design eliminates need for external compensation components, reducing bill-of-materials and PCB area while maintaining <1% output deviation under 500mA load steps.

How does the exposed pad (EP) affect thermal performance?

The EP must be soldered to a GND-connected copper pour to achieve the specified θ_JA = 55.5°C/W. Leaving it unconnected raises junction temperature by ~35°C at 500mA, risking thermal shutdown. No electrical connection is required - its sole purpose is thermal conduction.

Is AP7368D-33RS4-7 qualified for automotive applications?

No - AP7368D-33RS4-7 is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AP7368Q series) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation. This part is rated for −40°C to +85°C ambient and intended for commercial portable electronics.

AP7368D-33RS4-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-XFDFN Exposed Pad

Packaging:: Bulk

Product Status:: Active

Applications:: LDO, Cameras, Wireless Devices

Voltage - Input:: 5.5V

Number of Outputs:: 1

Voltage - Output:: 3.3V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: X1-DFN1612-8 (Type B)

AP7368D-33RS4-7 FAQ

1.How can I place an order for AP7368D-33RS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7368D-33RS4-7 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 AP7368D-33RS4-7 reliable?

The price and inventory of AP7368D-33RS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7368D-33RS4-7 is usually 5 days.

3.What payment methods are accepted for AP7368D-33RS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7368D-33RS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7368D-33RS4-7?

AP7368D-33RS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7368D-33RS4-7 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 AP7368D-33RS4-7?

For technical support, including AP7368D-33RS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7368D-33RS4-7 requirements.

6.How does Aetrix verify that AP7368D-33RS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7368D-33RS4-7 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 AP7368D-33RS4-7 meets industry standards.

7.What is the process for return or replacement of AP7368D-33RS4-7?

All AP7368D-33RS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7368D-33RS4-7, 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 AP7368D-33RS4-7 part is unused and in its original packaging.

Return procedure for AP7368D-33RS4-7:

1.Submit a request within 90 days.

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

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