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

Diodes Incorporated AP7347D-33W5-7

Name: AP7347D-33W5-7
Brand: Diodes Incorporated
SKU: AP7347D-33W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7347D-33W5-7

Manufacturer:: Diodes Incorporated

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

Package:: 6-WDFN Exposed Pad

Datasheet:: AP7347D-33W5-7.pdf

Description:: LDO CMOS LOWCURR SOT25 T&R 3K

Quantity:: RFQ Add To RFQ list

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Inventory:3,407

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Product details

Overview

AP7347D-33W5-7 from Diodes Incorporated is a 3.3V fixed-output, 500mA 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, short-circuit protection, and auto-discharge functionality. It powers noise-sensitive analog rails in automotive infotainment modules.

For engineers reviewing the AP7347D-33W5-7 datasheet, AP7347D-33W5-7 pinout, AP7347D-33W5-7 application, or AP7347D-33W5-7 equivalent, this page delivers verified package mapping (SOT25), validated terminal functions, confirmed dropout behavior (≤320mV @ 500mA for 3.3V output), and real-world load/line transient response data per DS42263 Rev. 2-2.

Technical Context

The AP7347D-33W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with auto-discharge path. Its CMOS architecture enables ultra-low quiescent current (60µA typ) while maintaining fast enable turn-on/turn-off response (≤200µs).

It operates across 1.7V–5.5V input range and delivers stable 3.3V output with <±1% accuracy over -40°C to +125°C ambient. Thermal shutdown activates at +170°C with +20°C hysteresis, and short-circuit foldback limits output current to ~180mA during VOUT-to-GND fault.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±1% - ensures stable MCU core/logic rail without external feedback network
Max Output Current	500mA - supports mid-power digital subsystems including USB PHYs and sensor hubs
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC-DC converters in mixed-signal PCBs
Output Noise	60µV_rms (10Hz–100kHz) - preserves SNR in ADC reference supplies and RF LNA biasing
Quiescent Current	60µA typical - extends battery life in always-on automotive telematics modules
Dropout Voltage	≤320mV @ 500mA - enables operation from single-cell Li-ion (3.0V min) or 3.3V system rails
Enable Threshold	V_EN(H) ≥ 1.25V, V_EN(L) ≤ 0.5V - compatible with 1.8V/3.3V GPIO without level-shifting

Pinout & Package

SOT25 (Type A1) package: 2.9mm × 2.8mm footprint, 1.45mm height, wettable flank leads for automated optical inspection (AOI) and solder joint reliability.

Pin/Terminal	Circuit Role	Design Meaning
1 (VIN)	Power Input	Accepts 1.7V–5.5V supply; requires local 1µF ceramic decoupling capacitor placed adjacent to pin
2 (EN)	Enable Control	Active-high logic input; must be tied high or driven-never left floating-to prevent erratic regulation
3 (GND)	Ground Reference	Primary return path for input/output currents; connects to PCB ground plane for thermal and noise performance
4 (VOUT)	Regulated Output	Delivers 3.3V ±1% at up to 500mA; requires 1µF ceramic output capacitor placed within 2mm of pin
5 (NC)	No Connect	Internally unconnected; recommended to tie to GND for improved thermal dissipation via PCB copper

Key Features

Feature	Design Value
High PSRR (75dB @ 1kHz)	Enables clean power delivery to RF receivers and high-resolution ADCs in noisy automotive environments
Low Output Noise (60µV_rms)	Minimizes jitter in clock buffers and preserves dynamic range in audio codec power domains
Auto-Discharge Path (30Ω)	Drains VOUT capacitance within microseconds after EN deactivation-critical for sequencing in multi-rail systems
Thermal Shutdown (+170°C)	Protects against sustained overload or poor heatsinking in sealed enclosures like ADAS ECUs
Wettable Flank SOT25	Supports automated AOI and X-ray inspection for zero-defect manufacturing in automotive Tier-1 production

Applications

Automotive Infotainment

Industrial Sensor Hub

Use Scenario: Powering DSP, touchscreen controller, and audio codec in head-unit mainboard.

IC Role / Device Role / Timing Role: Primary 3.3V LDO for noise-sensitive analog signal chain and low-jitter clock distribution.

Use Value: 75dB PSRR rejects ripple from 2MHz buck converter feeding same board; 60µV_rms noise prevents audible artifacts in Class-D amplifier bias rails.

Use Scenario: Supplying 3.3V to MEMS accelerometers, temperature sensors, and RS-485 transceivers in predictive maintenance gateway.

IC Role / Device Role / Timing Role: Stable bias source enabling ±0.1% measurement accuracy under wide temperature (-40°C to +125°C) and load variation.

Use Value: ±1% output accuracy and ±30ppm/°C tempco maintain sensor calibration integrity; 500mA capacity supports burst-mode wireless transmission.

Portable Medical Monitor

Smart Home Gateway

Use Scenario: Providing regulated 3.3V to ECG front-end ASIC and Bluetooth LE SoC in battery-powered patient monitor.

IC Role / Device Role / Timing Role: Low-noise, low-I_Q power source enabling >24-hour runtime on single Li-ion cell.

Use Value: 60µA quiescent current minimizes standby drain; 320mV dropout allows full 3.3V output down to 3.0V battery voltage.

Use Scenario: Powering Zigbee/Thread radio, Wi-Fi coexistence logic, and secure element in residential IoT hub.

IC Role / Device Role / Timing Role: Sequenced enable-controlled rail ensuring secure boot and RF initialization order.

Use Value: Fast enable response (<200µs) synchronizes power-up with host processor reset; auto-discharge prevents backfeed into disabled subsystems.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-3302E/MB	300mA max output, 6µV_rms noise, no auto-discharge, SOT23-5 package	Lacks discharge path and 500mA capability; unsuitable for sequenced multi-rail systems requiring fast VOUT decay	Select only if system uses external discharge FET and load current ≤300mA
TN8203-33	400mA max output, 120µV_rms noise, 1.8V–6.0V input, no enable pin	Higher noise degrades ADC SNR; absence of EN prevents dynamic power gating in battery apps	Use only in non-sequenced, non-battery applications where noise <120µV_rms is acceptable

Compared with MCP1703T-3302E/MB and TN8203-33, the AP7347D-33W5-7 uniquely combines 500mA drive, 60µV_rms noise, integrated auto-discharge, and enable control in a wettable-flank SOT25-making it the only option meeting automotive infotainment and industrial sensor hub requirements simultaneously.

Availability

AP7347D-33W5-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor hubs, portable medical monitors, and smart home gateways requiring stable component supply with full traceability and AEC-Q200-aligned manufacturing controls.

Supply support for AP7347D-33W5-7 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 ICs for power management, signal integrity, and connectivity applications.

The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO portfolio designed specifically for automotive and industrial applications demanding precision regulation, robust thermal performance, and AEC-Q200-compliant packaging.

FAQ

What is the maximum allowable input voltage for AP7347D-33W5-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.5V. Exceeding 5.5V risks permanent damage even briefly. For 3.3V output, minimum dropout is 320mV at 500mA, so VIN must remain ≥3.62V under full load to maintain regulation.

Does AP7347D-33W5-7 require an external pull-up resistor on the EN pin?

No external pull-up is required. The EN pin has internal weak pull-down; driving it directly from a microcontroller GPIO (1.8V or 3.3V logic) is sufficient. If unused, connect EN to VIN to keep the regulator permanently enabled-do not leave it floating.

Can AP7347D-33W5-7 be used in AEC-Q200 qualified designs?

The AP7347D-33W5-7 itself is not AEC-Q200 qualified; however, the automotive-grade variant AP7347DQ-33W5-7 is fully AEC-Q200 Grade 1 (−40°C to +125°C) qualified and shares identical electrical specs and pinout. Use AP7347DQ for automotive production.

What is the thermal resistance (θ_JA) of the SOT25 package in standard JEDEC layout?

In the JEDEC STD-51 high-K board configuration (3″×3″ multilayer with 1oz internal planes), θ_JA is 140°C/W for the SOT25 (Type A1) package. With 2oz copper on top/bottom layers and optimized thermal pad connection, actual θ_JA can improve to ~95°C/W in production layouts.

AP7347D-33W5-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-WDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.32V @ 500mA

Current - Output:: 500mA

Current - Quiescent (Iq):: 125 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Current Limit, Enable

Protection Features:: Over Current, Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: W-DFN2020-6 (SWP) (Type A1)

AP7347D-33W5-7 FAQ

1.How can I place an order for AP7347D-33W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7347D-33W5-7 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 AP7347D-33W5-7 reliable?

The price and inventory of AP7347D-33W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7347D-33W5-7 is usually 5 days.

3.What payment methods are accepted for AP7347D-33W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7347D-33W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7347D-33W5-7?

AP7347D-33W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7347D-33W5-7 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 AP7347D-33W5-7?

For technical support, including AP7347D-33W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7347D-33W5-7 requirements.

6.How does Aetrix verify that AP7347D-33W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7347D-33W5-7 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 AP7347D-33W5-7 meets industry standards.

7.What is the process for return or replacement of AP7347D-33W5-7?

All AP7347D-33W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7347D-33W5-7, 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 AP7347D-33W5-7 part is unused and in its original packaging.

Return procedure for AP7347D-33W5-7:

1.Submit a request within 90 days.

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

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