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

Diodes Incorporated AP7347D-12W5-7

Name: AP7347D-12W5-7
Brand: Diodes Incorporated
SKU: AP7347D-12W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7347D-12W5-7

Manufacturer:: Diodes Incorporated

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

Package:: 6-WDFN Exposed Pad

Datasheet:: AP7347D-12W5-7.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7347D-12W5-7 from Diodes Incorporated is a 500mA, 1.2V fixed-output low-dropout linear regulator with ±1% output voltage 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 noise-sensitive automotive and portable electronics, it operates across 1.7V–5.5V input and delivers stable 1.2V power to microcontrollers, sensors, and RF circuitry.

For engineers reviewing the AP7347D-12W5-7 datasheet, AP7347D-12W5-7 pinout, AP7347D-12W5-7 application, or AP7347D-12W5-7 equivalent, this LDO's high PSRR, low-noise performance, automotive-grade thermal robustness (−40°C to +125°C ambient), and SOT25 package make it suitable for precision power rails in battery-powered systems, infotainment modules, and industrial controllers where supply rejection and standby efficiency are critical.

Technical Context

The AP7347D-12W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and enable-controlled N-channel pass transistor with auto-discharge capability. Its architecture supports fast load/line transient response and maintains stability with only 1µF ceramic input/output capacitors.

It implements thermal shutdown at +170°C with +20°C hysteresis, foldback short-circuit current limiting (~180mA), and EN logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.25V). The device achieves dropout as low as 0.65V at 500mA for 1.2V output and exhibits ±30ppm/°C output voltage temperature coefficient.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.2V ±1% - ensures precise biasing for 1.2V-core logic and low-voltage analog circuits without external feedback.
Max Output Current	500mA - sufficient to power SoCs, PMICs, or multi-rail sensor subsystems from a single LDO stage.
PSRR	75dB at 1kHz - suppresses switching noise from upstream DC-DC converters, critical for ADC reference and RF front-end supplies.
Output Noise	60µV_rms (10Hz–100kHz) - enables clean power delivery to noise-sensitive PLLs, audio codecs, and precision amplifiers.
Quiescent Current	60µA - extends battery life in always-on monitoring nodes and low-power wake-up circuits.
Dropout Voltage	0.65V (typ.) at 500mA - allows operation down to 1.85V input while sustaining 1.2V output, supporting single-cell Li-ion or dual-cell alkaline inputs.
Enable Thresholds	V_IH = 1.25V, V_IL = 0.5V - compatible with 1.8V/3.3V GPIO control without level-shifting.
Thermal Shutdown	+170°C with +20°C hysteresis - prevents latch-up during sustained overload or poor PCB thermal design.

Pinout & Package

SOT25 (Type A1) package: 5-pin surface-mount, 2.9mm × 2.8mm footprint, wettable flank option for automated optical inspection. Exposed pad not present; thermal dissipation relies on copper area under pins 2 (GND) and 3 (EN).

Pin/Terminal	Circuit Role	Design Meaning
1 (VIN)	Power Input	Accepts 1.7V–5.5V input; requires local 1µF ceramic decoupling to ground for stability and noise suppression.
2 (EN)	Enable Control	Active-high logic input; must be driven to GND or VIN-floating state disables regulation and risks erratic behavior.
3 (GND)	Ground Reference	Primary return path for input/output currents; connects directly to system ground plane to minimize noise coupling.
4 (VOUT)	Regulated Output	Delivers 1.2V ±1% at up to 500mA; requires local 1µF ceramic capacitor to maintain transient response and phase margin.
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)	Rejects ripple from noisy switchers, enabling mixed-signal SoC power domains without additional filtering.
Low 60µV_rms noise	Eliminates need for post-LDO LC filters in RF and high-resolution data acquisition paths.
Auto-discharge via 30Ω NMOS	Drains VOUT within microseconds after shutdown, preventing back-powering of downstream circuitry.
±1% output accuracy over temp	Guarantees timing margin compliance for 1.2V core voltages in FPGA and MCU applications across full operating range.
Thermal shutdown + hysteresis	Prevents thermal runaway during sustained overload while allowing safe recovery without manual reset.
Lead-free, halogen-free, RoHS 3 compliant	Meets automotive and industrial environmental mandates without compromising electrical performance.

Applications

Automotive Infotainment Power

Portable Medical Sensor Node

Use Scenario: Powering 1.2V core rails of ARM Cortex-A53 processors and display interface ICs in head-unit systems.

IC Role / Device Role / Timing Role: Primary low-noise post-regulator supplying CPU core voltage with tight tolerance and fast transient response to dynamic load changes.

Use Value: 75dB PSRR prevents switching noise from buck converters from corrupting video timing and audio DAC outputs.

Use Scenario: Providing regulated 1.2V bias to ultra-low-power biosensor signal chains and BLE SoCs in wearable ECG patches.

IC Role / Device Role / Timing Role: Standby-mode LDO delivering stable reference voltage to analog front-ends while maintaining sub-100µA system quiescent current.

Use Value: 60µA I_Q and 60µV_rms noise ensure >14-bit ENOB in ADC measurements without external filtering.

Industrial PLC I/O Module

Smart Home Hub Controller

Use Scenario: Generating isolated 1.2V supply for isolated CAN transceivers and digital isolators in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Secondary LDO after isolated DC-DC, providing clean, enable-controlled power to communication PHY layers.

Use Value: Enable pin allows synchronized power-up/down sequencing with main controller, preventing bus contention during reset.

Use Scenario: Supplying 1.2V core voltage to Wi-Fi 6 SoCs and voice assistant DSPs in always-listening smart speaker hubs.

IC Role / Device Role / Timing Role: Always-on LDO with auto-discharge, ensuring rapid power-down of peripherals upon voice trigger detection.

Use Value: 30Ω discharge path clears VOUT in <10µs, eliminating leakage-induced false wake-ups and reducing standby power by >2µA.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-1202E/MB	1.2V fixed, 250mA max, 120µA I_Q, no auto-discharge, SOT23-5 package	Limited to lower-current peripherals; lacks discharge function for strict power sequencing.	Select when cost sensitivity outweighs current capability and discharge requirement.
Torex XC6210B122MR-G	1.2V fixed, 500mA, 80µA I_Q, 65dB PSRR @ 1kHz, no thermal shutdown hysteresis	Lower PSRR and missing thermal hysteresis reduce robustness in thermally constrained enclosures.	Choose only if footprint compatibility with XC6210 series is mandatory and thermal margin is verified.

Compared with MCP1703T-1202E/MB and XC6210B122MR-G, the AP7347D-12W5-7 uniquely combines 500mA drive, 75dB PSRR, 60µA I_Q, auto-discharge, and thermal hysteresis in a compact SOT25 package-making it optimal for space-constrained, noise-sensitive, and thermally demanding applications where reliability and feature integration are prioritized.

Availability

AP7347D-12W5-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical devices, industrial PLC I/O modules, and smart home hubs requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.

Supply support for AP7347D-12W5-7 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 belongs to Diodes' high-performance LDO family engineered for noise-critical, automotive-qualified power management-emphasizing PSRR, low-noise, thermal resilience, and enable-controlled sequencing in compact packages.

FAQ

What is the minimum input voltage required for AP7347D-12W5-7 to regulate 1.2V output at 500mA?

The AP7347D-12W5-7 requires a minimum input voltage of 1.85V to sustain 1.2V output at 500mA, based on its typical dropout voltage of 0.65V at that load. At higher temperatures or worst-case process corners, the maximum dropout may reach 0.80V, so 2.0V input is recommended for margin in production designs.

Can the NC pin (Pin 5) be left floating in the SOT25 package?

No-Pin 5 (NC) must not be left floating. Although internally unconnected, Diodes recommends tying it to GND to maximize PCB copper area for thermal dissipation and improve EMI shielding. Leaving it unconnected reduces thermal performance and may increase radiated emissions.

Does AP7347D-12W5-7 include reverse-current protection?

No-the AP7347D-12W5-7 does not integrate reverse-current protection. Its internal N-channel pass transistor allows reverse current flow from VOUT to VIN when VOUT > VIN. External Schottky diode or ideal diode controller is required if backfeed prevention is needed in the system design.

Is AP7347D-12W5-7 qualified for automotive applications?

The standard AP7347D-12W5-7 is not AEC-Q200 qualified; however, the automotive-grade variant AP7347DQ-12W5-7 is available separately and meets AEC-Q200 Grade 1 (−40°C to +125°C) requirements, including extended reliability testing and enhanced process controls.

AP7347D-12W5-7 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):: 1.2V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.8V @ 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-12W5-7 FAQ

1.How can I place an order for AP7347D-12W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7347D-12W5-7 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-12W5-7 reliable?

The price and inventory of AP7347D-12W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7347D-12W5-7 is usually 5 days.

3.What payment methods are accepted for AP7347D-12W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7347D-12W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7347D-12W5-7?

AP7347D-12W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7347D-12W5-7 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-12W5-7?

For technical support, including AP7347D-12W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7347D-12W5-7 requirements.

6.How does Aetrix verify that AP7347D-12W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7347D-12W5-7 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-12W5-7 meets industry standards.

7.What is the process for return or replacement of AP7347D-12W5-7?

All AP7347D-12W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7347D-12W5-7, 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-12W5-7 part is unused and in its original packaging.

Return procedure for AP7347D-12W5-7:

1.Submit a request within 90 days.

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

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