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

Diodes Incorporated AP7347D-28W5-7

Name: AP7347D-28W5-7
Brand: Diodes Incorporated
SKU: AP7347D-28W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7347D-28W5-7

Manufacturer:: Diodes Incorporated

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

Package:: 6-WDFN Exposed Pad

Datasheet:: AP7347D-28W5-7.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:2,395

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Product details

Overview

AP7347D-28W5-7 from Diodes Incorporated is a 2.8V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It features CMOS-based architecture, enable control, thermal shutdown, short-circuit protection, and auto-discharge functionality. Designed for noise-sensitive automotive and portable electronics, it operates across 1.7V–5.5V input and delivers stable 2.8V power to microcontrollers, sensors, and RF circuitry.

For engineers reviewing the AP7347D-28W5-7 datasheet, AP7347D-28W5-7 pinout, AP7347D-28W5-7 application, or AP7347D-28W5-7 equivalent, key selection criteria include dropout voltage at 500mA (0.27–0.32V for 2.8V output), quiescent current (60µA typ), EN logic thresholds (0.5V max low, 1.25V min high), and thermal resistance (140°C/W in SOT25).

Technical Context

The AP7347D-28W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with auto-discharge capability. Its CMOS process enables low quiescent current and high PSRR without requiring external compensation.

Enable control is implemented via a dedicated EN pin with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.25V); NC pins are internally unconnected and recommended tied to GND for thermal enhancement. Thermal shutdown activates at +170°C with +20°C hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.8V ±1% - ensures stable supply for 2.8V I/O domains and analog front-ends without external resistors.
Max Output Current	500mA - supports moderate-power SoCs, PMIC rails, and multi-sensor subsystems.
Dropout Voltage	0.27–0.32V @ 500mA - enables operation down to VIN = 3.07V while maintaining regulation.
PSRR	75dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input.
Output Noise	60µV_rms (10Hz–100kHz) - minimizes phase jitter in clock buffers and SNR degradation in ADCs/DACs.
Quiescent Current	60µA typ - extends battery life in always-on sensor nodes and low-power wake-up circuits.
EN Thresholds	V_IL ≤ 0.5V / V_IH ≥ 1.25V - compatible with 1.8V/3.3V GPIOs without level-shifting.

Pinout & Package

AP7347D-28W5-7 is packaged in SOT25 (Type A1), a 5-pin surface-mount package with 1.45mm height and 2.9mm × 2.8mm footprint. The exposed pad is absent; thermal dissipation relies on PCB copper area under pins 2 (GND) and 3 (EN).

Pin	Circuit Role	Design Meaning
1	VIN	Main power input; requires ≥1µF ceramic decoupling capacitor placed adjacent to pin.
2	EN	Active-high enable; must be driven to defined logic levels-floating state disables regulation.
3	GND	Power ground reference; connects to PCB ground plane to minimize noise coupling and voltage drop.
4	VOUT	Regulated 2.8V output; requires ≥1µF ceramic capacitor near pin for stability and transient response.
5	NC	No internal connection; recommended tied to GND to improve thermal conduction and reduce EMI susceptibility.

Key Features

Feature	Design Value
High PSRR (75dB @ 1kHz)	Enables clean 2.8V rail in mixed-signal systems where DC/DC ripple would otherwise degrade RF or audio performance.
Auto-Discharge (30Ω N-channel)	Drains VOUT capacitance within microseconds after EN deactivation-critical for fast power sequencing in multi-rail systems.
±1% Output Accuracy	Guarantees compliance with tight voltage tolerances of modern microcontrollers (e.g., ARM Cortex-M series I/O supply specs).
Low 60µV_rms Noise	Preserves signal integrity in precision analog stages such as instrumentation amplifiers and reference buffers.
Thermal Shutdown (+170°C)	Prevents catastrophic failure during sustained overload or poor heatsinking-releases at +150°C due to +20°C hysteresis.

Applications

Automotive Infotainment

Portable Medical Sensors

Use Scenario: Powering display interface ICs and touch controller in vehicle head units operating across -40°C to +125°C ambient.

IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying I/O banks and level-shifted communication interfaces (I²C, SPI).

Use Value: High PSRR rejects alternator ripple and DC/DC switching noise; ±1% accuracy ensures reliable digital interface timing margins.

Use Scenario: Supplying ultra-low-noise analog front-end (AFE) in wearable ECG monitors powered by coin-cell batteries.

IC Role / Device Role / Timing Role: Low-noise, low-I_Q bias source for op-amps and ADC reference buffers.

Use Value: 60µV_rms noise prevents baseline drift; 60µA quiescent current extends battery runtime beyond 7 days per charge.

Industrial PLC I/O Modules

Wi-Fi/BLE IoT Edge Nodes

Use Scenario: Regulating 2.8V for isolated digital I/O drivers and status LEDs in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Secondary LDO delivering fault-tolerant power to field-side logic under wide input transients.

Use Value: 500mA output sustains multiple LED loads; thermal shutdown protects against enclosure overheating during extended operation.

Use Scenario: Providing regulated 2.8V to Wi-Fi SoC RF section and flash memory in battery-powered smart home sensors.

IC Role / Device Role / Timing Role: Enable-controlled power domain that powers down RF subsystem during sleep cycles.

Use Value: EN pin compatibility with 1.8V MCU GPIO allows direct control; 0.32V dropout enables operation until battery reaches 3.12V.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-2802E/MB	Fixed 2.8V, 250mA output, 120µA I_Q, no auto-discharge, 65dB PSRR @ 1kHz	Limited to lower-current peripherals; lacks fast discharge for sequencing-critical designs	Select when cost sensitivity outweighs need for 500mA drive or auto-discharge.
Torex XC6210B282MR-G	Fixed 2.8V, 500mA, 1.0µA I_Q (standby), no EN pin, 60dB PSRR @ 1kHz, no thermal shutdown	Suitable only for always-on, thermally benign environments; no enable control or overtemperature protection	Choose only for ultra-low-power standby applications where EN and thermal safety are not required.

Compared with MCP1703T-2802E/MB and XC6210B282MR-G, AP7347D-28W5-7 uniquely combines 500mA drive, 60µA I_Q, 75dB PSRR, auto-discharge, and thermal shutdown in a single SOT25 package-making it optimal for automotive-grade, sequenced, noise-sensitive 2.8V rails.

Availability

AP7347D-28W5-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical sensors, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.

Supply support for AP7347D-28W5-7 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 automotive, industrial, computing, and consumer markets.

The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive applications in automotive and portable electronics where precision regulation and fast transient response are critical.

FAQ

What is the minimum input voltage required for AP7347D-28W5-7 to maintain regulation at full 500mA load?

The dropout voltage for 2.8V output is specified as 0.27–0.32V at 500mA. Therefore, the minimum input voltage is 2.8V + 0.32V = 3.12V. Below this, output voltage drops below nominal regulation; operation is guaranteed only within the 1.7V–5.5V input range per datasheet conditions.

Can the NC pin (Pin 5) be left floating in the AP7347D-28W5-7 SOT25 package?

No. Pin 5 is internally unconnected but must be tied to GND on the PCB. This improves thermal dissipation through increased copper area and reduces electromagnetic interference susceptibility. Leaving it floating may compromise thermal performance and EMC behavior.

Does AP7347D-28W5-7 provide reverse current blocking when disabled?

No. The device does not integrate reverse current blocking. However, its auto-discharge function uses an internal 30Ω N-channel MOSFET to actively pull VOUT to GND when EN is low-ensuring rapid discharge of output capacitance but not preventing backfeed from VOUT to VIN.

Is AP7347D-28W5-7 qualified for automotive applications?

The base AP7347D-28W5-7 is not AEC-Q200 qualified. Diodes offers the automotive-compliant variant AP7347DQ (same electrical specs, enhanced testing and traceability) for automotive use. Designers targeting automotive applications must specify AP7347DQ instead.

AP7347D-28W5-7 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):: 2.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.36V @ 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-28W5-7 FAQ

1.How can I place an order for AP7347D-28W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7347D-28W5-7 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-28W5-7 reliable?

The price and inventory of AP7347D-28W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7347D-28W5-7 is usually 5 days.

3.What payment methods are accepted for AP7347D-28W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7347D-28W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7347D-28W5-7?

AP7347D-28W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7347D-28W5-7 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-28W5-7?

For technical support, including AP7347D-28W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7347D-28W5-7 requirements.

6.How does Aetrix verify that AP7347D-28W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7347D-28W5-7 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-28W5-7 meets industry standards.

7.What is the process for return or replacement of AP7347D-28W5-7?

All AP7347D-28W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7347D-28W5-7, 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-28W5-7 part is unused and in its original packaging.

Return procedure for AP7347D-28W5-7:

1.Submit a request within 90 days.

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

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