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

Diodes Incorporated AP7343D-27W5-7

Name: AP7343D-27W5-7
Brand: Diodes Incorporated
SKU: AP7343D-27W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7343D-27W5-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP7343D-27W5-7.pdf

Description:: IC REG LINEAR 2.7V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7343D-27W5-7 from Diodes Incorporated is a 300mA low-dropout linear regulator with fixed 2.7V output, high PSRR (75dB at 1kHz), ultra-low output noise (60µVrms, 10Hz–100kHz), ±1% output voltage accuracy, and enable-controlled shutdown. It operates from 1.7V to 5.25V input and delivers stable power for RF supply rails and portable media subsystems using its SOT25 package.

For engineers reviewing the AP7343D-27W5-7 datasheet, AP7343D-27W5-7 pinout, AP7343D-27W5-7 application, or AP7343D-27W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.22–0.31V), quiescent current (35µA typ), thermal shutdown threshold (+150°C), and built-in discharge functionality enabled by the 'D' suffix.

Technical Context

The AP7343D-27W5-7 integrates a CMOS-based pass transistor, precision voltage reference, error amplifier, current-limit circuit, and thermal shutdown protection. Its enable input (EN) provides precise on/off control with defined logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.3V).

It features auto-discharge functionality (indicated by 'D' in part number), where an internal 30Ω N-channel MOSFET actively discharges the output capacitor during shutdown-critical for fast system reset and rail sequencing in multi-voltage domain designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.7V ±1% - ensures stable bias for RF transceivers and camera sensor analog blocks without external feedback.
Max Output Current	300mA - supports moderate-power digital baseband ICs and audio codecs in portable devices.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding shared PCB power planes.
Output Noise	60µVrms (10Hz–100kHz) - preserves signal integrity in low-noise analog front-ends like microphone preamps and ADC references.
Quiescent Current	35µA typical - extends battery life in always-on sensor nodes and standby modes of wireless adapters.
Dropout Voltage	0.22V at 300mA (V_OUT = 2.7V) - enables operation from single-cell Li-ion (3.0–4.2V) or 3.3V rails with minimal headroom loss.
Enable Threshold	V_IH ≥ 1.3V, V_IL ≤ 0.5V - compatible with 1.8V/3.3V GPIOs for direct microcontroller control without level-shifting.

Pinout & Package

The AP7343D-27W5-7 is housed in the SOT25 (SC-74A) 5-pin surface-mount package, optimized for compact portable layouts with exposed pad thermal enhancement. Pin 5 is NC; Pin 4 is VIN; Pin 3 is EN; Pin 2 is GND; Pin 1 is VOUT.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (VOUT)	Regulated Power Output	Delivers clean 2.7V to load; requires local 1µF ceramic capacitor placed adjacent to minimize loop inductance.
Pin 2 (GND)	Power Ground Reference	Primary return path for output current; must connect directly to low-impedance ground plane to avoid regulation error.
Pin 3 (EN)	Active-High Enable Control	Drives regulator ON when ≥1.3V; pulls output to 0V with discharge path when <0.5V-enables deterministic power-down sequencing.
Pin 4 (VIN)	Input Power Supply	Accepts 1.7–5.25V; requires 0.47µF decoupling capacitor placed within 2mm to suppress supply transients.
Pin 5 (NC)	No Connection	Not internally bonded; must remain unconnected per datasheet-floating or tied to GND may cause reliability risk.

Key Features

Feature	Design Value
Auto-discharge function	30Ω internal NMOS discharges VOUT to GND in <1ms after EN deactivation-eliminates hold-up time in multi-rail systems.
High PSRR at 1kHz	75dB attenuation of ripple from noisy switchers-reduces need for additional LC filtering in space-constrained designs.
Low-noise output	60µVrms broadband noise-meets stringent SNR requirements for 16-bit+ audio DACs and RF synthesizer VCO supplies.
Thermal shutdown	+150°C trip point with +20°C hysteresis-prevents permanent damage during sustained overload or poor heatsinking.
Ultra-low I_Q	35µA typical quiescent current-enables >1-year battery life in BLE sensor nodes operating at 10s-of-µA average current.

Applications

RF Power Amplifier Bias

Camera Sensor Analog Supply

Use Scenario: Providing clean, low-noise 2.7V bias to GaAs pHEMT power amplifiers in LTE/Wi-Fi front-end modules.

IC Role / Device Role / Timing Role: LDO regulator delivering stable V_PA with fast transient response to support burst-mode transmission.

Use Value: 75dB PSRR rejects switching noise from PMIC DC/DC converters, preventing AM-to-PM distortion and EVM degradation.

Use Scenario: Powering analog pixel arrays and column ADCs in smartphone image sensors requiring sub-100µV noise floor.

IC Role / Device Role / Timing Role: Low-noise post-regulator for noise-sensitive analog signal chain stages.

Use Value: 60µVrms output noise avoids quantization noise floor elevation, preserving dynamic range in 12-bit+ imaging pipelines.

Wireless Adapter Core Logic

Portable Media Player Audio Codec

Use Scenario: Supplying 2.7V to Wi-Fi/BT SoC core logic and memory interfaces in USB dongles and IoT gateways.

IC Role / Device Role / Timing Role: Primary voltage regulator enabling low-power sleep states via EN-controlled shutdown.

Use Value: 35µA quiescent current and auto-discharge reduce system standby power to <100µW-extending battery runtime in always-connected devices.

Use Scenario: Delivering regulated 2.7V to stereo audio codecs in MP3 players and Bluetooth speakers.

IC Role / Device Role / Timing Role: Low-noise analog supply for DAC, headphone amplifier, and microphone bias circuits.

Use Value: ±1% output accuracy maintains consistent gain calibration across temperature; 0.22V dropout allows use with aging Li-ion cells down to 3.0V.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703-2702E/TO	300mA, 2.7V fixed, no discharge, 6µA I_Q, 65dB PSRR @1kHz	Lacks auto-discharge; lower PSRR reduces noise rejection in dense RF layouts	Select when ultra-low I_Q dominates over discharge requirement and noise margin is sufficient.
Torex XC6219B272MR-G	300mA, 2.7V fixed, discharge option ('D' variant), 45µA I_Q, 70dB PSRR @1kHz	Slightly higher noise (80µVrms), same thermal shutdown but lower R_θJA (160°C/W)	Prefer for thermally constrained PCBs where junction temperature rise must be minimized under 300mA load.

Compared with MCP1703-2702E/TO and XC6219B272MR-G, the AP7343D-27W5-7 uniquely combines 75dB PSRR, 60µVrms noise, and guaranteed 30Ω discharge-making it optimal for RF and imaging applications demanding simultaneous noise suppression, fast rail collapse, and thermal robustness.

Availability

AP7343D-27W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor analog supply, wireless adapter core logic, and portable media player audio codec applications requiring stable component supply, automotive-grade traceability, and long-term lifecycle support.

Supply support for AP7343D-27W5-7 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 AP7343 series belongs to Diodes' high-performance LDO portfolio, designed specifically for noise-sensitive portable electronics where PSRR, output noise, and fast enable/discharge response are critical system-level requirements.

FAQ

What is the purpose of the NC pin (Pin 5) in the SOT25 package?

Pin 5 is a no-connect terminal with no internal bond wire or silicon connection. It must remain unconnected in PCB layout-neither grounded nor routed-to prevent potential latch-up or reliability issues. The datasheet explicitly prohibits using this pin as a thermal pad or ground tie.

Does the AP7343D-27W5-7 require an external discharge resistor?

No. The 'D' suffix confirms integrated auto-discharge functionality: an internal 30Ω NMOS connects VOUT to GND when EN is low. This eliminates the need for external resistors, reduces BOM count, and ensures consistent discharge timing (<1ms) across temperature and process variation.

How does the AP7343D-27W5-7 behave during input undervoltage or overtemperature conditions?

Under input undervoltage (VIN < 1.7V), regulation ceases and VOUT follows VIN minus dropout. During overtemperature, thermal shutdown activates at +150°C junction temperature, disabling the pass element until junction cools by +20°C hysteresis-preventing irreversible damage without requiring external monitoring circuitry.

Can the AP7343D-27W5-7 be used with ceramic output capacitors smaller than 1µF?

Yes-the device is stable with ≥0.47µF ceramic capacitors. However, 1µF is recommended for optimal transient response under 300mA load steps. Lower values increase peak voltage deviation during load transients; ESR must remain <10mΩ to maintain phase margin across temperature and capacitance tolerance.

AP7343D-27W5-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 2.7V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.3V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: -

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-25

AP7343D-27W5-7 FAQ

1.How can I place an order for AP7343D-27W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7343D-27W5-7 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 AP7343D-27W5-7 reliable?

The price and inventory of AP7343D-27W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343D-27W5-7 is usually 5 days.

3.What payment methods are accepted for AP7343D-27W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-27W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7343D-27W5-7?

AP7343D-27W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7343D-27W5-7 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 AP7343D-27W5-7?

For technical support, including AP7343D-27W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-27W5-7 requirements.

6.How does Aetrix verify that AP7343D-27W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7343D-27W5-7 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 AP7343D-27W5-7 meets industry standards.

7.What is the process for return or replacement of AP7343D-27W5-7?

All AP7343D-27W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-27W5-7, 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 AP7343D-27W5-7 part is unused and in its original packaging.

Return procedure for AP7343D-27W5-7:

1.Submit a request within 90 days.

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

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