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

Diodes Incorporated AP7347D-18W5-7

Name: AP7347D-18W5-7
Brand: Diodes Incorporated
SKU: AP7347D-18W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7347D-18W5-7

Manufacturer:: Diodes Incorporated

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

Package:: 6-WDFN Exposed Pad

Datasheet:: AP7347D-18W5-7.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,168

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Product details

Overview

AP7347D-18W5-7 from Diodes Incorporated is a 500mA low-dropout linear regulator with fixed 1.8V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 60µA quiescent current. It features enable control, thermal shutdown, short-circuit protection, and auto-discharge functionality-designed for powering noise-sensitive analog and digital circuitry in portable and automotive applications.

For engineers reviewing the AP7347D-18W5-7 datasheet, AP7347D-18W5-7 pinout, AP7347D-18W5-7 application, or AP7347D-18W5-7 equivalent, this LDO's high PSRR, low-noise performance, tight output tolerance, and SOT25 package make it suitable for powering RF front-ends, ADC/DAC reference rails, and microcontroller core supplies where supply ripple rejection and stability under load transients are critical.

Technical Context

The AP7347D-18W5-7 uses a CMOS-based architecture with integrated voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor. Its enable input provides precise on/off control with defined logic thresholds (EN low ≤0.5V, EN high ≥1.25V), and internal auto-discharge activates a 30Ω N-channel path when disabled to rapidly discharge VOUT.

It operates across 1.7V–5.5V input range with dropout as low as 0.45V at 500mA for 1.8V output, supports stable operation with 1µF ceramic input/output capacitors, and delivers guaranteed 500mA output current while maintaining ±1% output accuracy over -40°C to +125°C ambient temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.8V ±1% - ensures stable core rail for 1.8V I/O or logic domains without external feedback.
Max Output Current	500mA - sufficient to power mid-complexity MCUs, sensors, or interface ICs without derating at 85°C.
PSRR	75dB at 1kHz - suppresses switching noise from upstream DC/DC converters feeding noisy power domains.
Output Noise	60µV_rms (10Hz–100kHz) - minimizes jitter in clock buffers and quantization noise in precision ADCs.
Quiescent Current	60µA - enables ultra-low-power standby modes in battery-operated devices with minimal leakage impact.
Dropout Voltage	0.45V typical at 500mA - allows operation from single-cell Li-ion (3.0V min) or 3.3V rails with margin.
Enable Threshold	EN high ≥1.25V, EN low ≤0.5V - compatible with 1.8V/3.3V GPIO without level-shifting.

Pinout & Package

SOT25 (Type A1) package: 5-pin surface-mount with exposed pad not present; compact 2.9mm × 2.8mm footprint optimized for space-constrained PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 (VIN)	Input Power Supply	Accepts 1.7V–5.5V; requires local 1µF ceramic decoupling to minimize input impedance and prevent instability.
2 (EN)	Enable Control Input	Active-high logic input; must be driven to GND or VIN-floating prohibited; enables fast turn-on/turn-off response.
3 (GND)	Ground Reference	Primary ground return for regulator and load; must connect to low-impedance PCB ground plane to limit voltage drop.
4 (VOUT)	Regulated Output	Delivers 1.8V ±1%; requires 1µF ceramic capacitor placed adjacent to pin for transient stability and EMI reduction.
5 (NC)	No Connect	Internally unconnected; recommended to tie to GND for improved thermal conduction and EMI shielding.

Key Features

Feature	Design Value
High PSRR (75dB @ 1kHz)	Enables clean power delivery in mixed-signal systems sharing noisy DC/DC sources-no additional filtering required.
Auto-Discharge (30Ω NMOS)	Drains VOUT within microseconds after disable, preventing back-powering of downstream circuits or latch-up risks.
±1% Output Accuracy	Meets tight tolerance requirements for 1.8V FPGA I/O banks, LPDDR2/3 termination, and low-voltage logic interfaces.
Thermal Shutdown (170°C)	Protects against sustained overload or poor heatsinking; includes 20°C hysteresis to prevent oscillation near trip point.
Low Noise (60µV_rms)	Preserves signal integrity in RF receivers, audio codecs, and precision sensor signal chains without post-regulation filtering.

Applications

Portable Medical Sensors

Automotive Infotainment SoC Core Rail

Use Scenario: Powering ultra-low-power ECG front-end ASICs and MEMS accelerometers in wearable patches.

IC Role / Device Role / Timing Role: Primary 1.8V analog/digital supply with sub-100µA quiescent draw during sleep and rapid wake-up response.

Use Value: 60µV_rms noise prevents baseline drift in µV-level biopotential measurements; ±1% accuracy ensures consistent ADC reference scaling.

Use Scenario: Delivering stable 1.8V core voltage to application processors in head-unit infotainment systems.

IC Role / Device Role / Timing Role: Post-regulator for DDR memory I/O and GPU subsystems requiring low-noise, high-transient-response supply.

Use Value: 75dB PSRR rejects ripple from 2MHz buck converters; 500mA capacity supports burst-mode CPU loads without droop.

Industrial IoT Edge Node MCU

White Goods Display Controller

Use Scenario: Supplying 1.8V logic and RF transceiver (BLE/Wi-Fi) in battery-powered smart meters and gateway modules.

IC Role / Device Role / Timing Role: Always-on LDO with enable-controlled shutdown for deep-sleep mode; auto-discharge prevents leakage through display interface lines.

Use Value: 60µA IQ extends 10-year battery life; EN-compatible 1.8V GPIO eliminates need for external level shifters.

Use Scenario: Regulating 1.8V supply for LCD timing controllers and touch controller ICs in refrigerator/freezer displays.

IC Role / Device Role / Timing Role: Fixed-output LDO operating across wide ambient (-25°C to +70°C) with robust thermal shutdown for enclosed enclosures.

Use Value: 125°C max junction rating and 170°C thermal shutdown ensure reliability in thermally isolated plastic housings; SOT25 eases reflow assembly.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-1802E/MB	400mA rated, 120µA IQ, no auto-discharge, 65dB PSRR at 1kHz	Lacks fast VOUT discharge; lower PSRR limits use in RF-sensitive designs	Prefer when cost sensitivity outweighs noise/PSRR requirements and discharge is handled externally
Torex XC6210B182MR-G	300mA rated, 1.0µA IQ, no enable, 70dB PSRR at 1kHz	Ultra-low IQ but no enable control or auto-discharge; smaller USP-6B package	Choose only for always-on, space-constrained applications where enable and discharge are unnecessary

Compared with MCP1703T-1802E/MB and XC6210B182MR-G, the AP7347D-18W5-7 uniquely combines 500mA drive, 75dB PSRR, 60µA IQ, and integrated auto-discharge-making it the only option among the three qualified for automotive-grade noise-critical, enable-controlled, and fast-turnoff applications.

Availability

AP7347D-18W5-7 is available at Aetrix Electronics and suitable for portable medical sensors, automotive infotainment SoC core rails, and industrial IoT edge node MCUs requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP7347D-18W5-7 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 AP7347D series belongs to Diodes' high-PSRR, low-noise LDO portfolio, engineered specifically for noise-sensitive automotive, industrial, and portable electronics where clean, accurate, and controllable power delivery is mission-critical.

FAQ

What is the maximum input voltage for AP7347D-18W5-7?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.5V. Exceeding 5.5V may trigger overvoltage stress or reduce reliability, even if within absolute ratings. For 1.8V output, minimum input is 2.25V to maintain regulation under worst-case dropout (0.45V).

Does AP7347D-18W5-7 require an external pull-up on the EN pin?

No external pull-up is required. The EN pin has no internal pull-up; however, if enable control is unused, it must be tied directly to VIN to ensure continuous operation. Leaving EN floating violates the datasheet requirement and may cause erratic regulation or increased quiescent current.

Can AP7347D-18W5-7 be used with ceramic output capacitors less than 1µF?

The device is characterized and stable with ≥1µF ceramic output capacitance. Using smaller values (e.g., 0.47µF) may degrade transient response and phase margin, risking oscillation under load steps. Diodes specifies 1µF as the minimum for guaranteed stability across temperature and process variation.

Is AP7347D-18W5-7 AEC-Q200 qualified?

No-the AP7347D-18W5-7 is the commercial-grade variant. The automotive-qualified version is AP7347DQ-18W5-7, which undergoes extended temperature screening (-40°C to +125°C), enhanced reliability testing, and AEC-Q200 stress qualification per the separate datasheet DS42263Q.

AP7347D-18W5-7 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):: 1.8V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.55V @ 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-18W5-7 FAQ

1.How can I place an order for AP7347D-18W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7347D-18W5-7 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-18W5-7 reliable?

The price and inventory of AP7347D-18W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7347D-18W5-7 is usually 5 days.

3.What payment methods are accepted for AP7347D-18W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7347D-18W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7347D-18W5-7?

AP7347D-18W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7347D-18W5-7 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-18W5-7?

For technical support, including AP7347D-18W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7347D-18W5-7 requirements.

6.How does Aetrix verify that AP7347D-18W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7347D-18W5-7 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-18W5-7 meets industry standards.

7.What is the process for return or replacement of AP7347D-18W5-7?

All AP7347D-18W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7347D-18W5-7, 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-18W5-7 part is unused and in its original packaging.

Return procedure for AP7347D-18W5-7:

1.Submit a request within 90 days.

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

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