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

Diodes Incorporated AP7343D-35W5-7

Name: AP7343D-35W5-7
Brand: Diodes Incorporated
SKU: AP7343D-35W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7343D-35W5-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP7343D-35W5-7.pdf

Description:: IC REG LINEAR 3.5V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7343D-35W5-7 from Diodes Incorporated is a 300mA, 3.5V fixed-output 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, and short-circuit protection, and is optimized for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7343D-35W5-7 datasheet, AP7343D-35W5-7 pinout, AP7343D-35W5-7 application, or AP7343D-35W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.22–0.29V), ultra-low quiescent current (35µA typ), EN logic thresholds (0.5V_IL/1.3V_IH), and SOT25 package thermal resistance (179°C/W).

Technical Context

The AP7343D-35W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with built-in auto-discharge functionality activated during shutdown. Its CMOS process enables low R_DS(ON) and stable operation with 1µF ceramic output capacitors.

It delivers regulated 3.5V output across 1.7–5.25V input range, supports fast load transient response (≤100µs recovery), and includes thermal shutdown at +150°C with +20°C hysteresis. The EN pin accepts 0–5.25V logic and draws ≤1.0µA leakage.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.5V ±1% at +25°C; ensures stable bias for 3.3V-tolerant RF ICs and baseband processors.
Max Output Current	300mA guaranteed; sufficient to power dual-band RF transceivers or image sensor analog blocks.
Dropout Voltage	0.22–0.29V at 300mA (SOT25); enables operation from single-cell Li-ion (3.0V min) with margin.
PSRR	75dB at 1kHz; suppresses switching noise from DC-DC converters feeding adjacent digital circuits.
Output Noise	60µV_rms (10Hz–100kHz); meets stringent SNR requirements for RF front-end LNA and mixer supplies.
Quiescent Current	35µA typical; extends battery life in always-on wireless adapter standby modes.
Enable Thresholds	V_IL ≤ 0.5V, V_IH ≥ 1.3V; compatible with 1.8V/3.3V GPIO without level-shifting.

Pinout & Package

AP7343D-35W5-7 is packaged in the SOT25 (TSOT-23-5) surface-mount package - a 2.9mm × 1.6mm × 1.1mm 5-pin footprint with exposed pad for thermal enhancement. Pin 5 is NC (no connection); the exposed pad must be connected to GND via large copper area for optimal thermal dissipation (R_θJB = 79.2°C/W).

Pin/Terminal	Circuit Role	Design Meaning
PIN1 (VOUT)	Regulated Power Output	Delivers clean 3.5V to load; requires 1µF ceramic capacitor placed within 2mm of pin for stability.
PIN2 (GND)	Analog/Digital Ground Reference	Common return path for internal circuitry and external decoupling; must connect directly to low-impedance ground plane.
PIN3 (EN)	Active-High Enable Control	Drives high (>1.3V) to activate regulator; pulled low (<0.5V) to enter 0.01µA shutdown mode with auto-discharge.
PIN4 (VIN)	Input Power Supply	Accepts 1.7–5.25V; requires 0.47µF ceramic capacitor placed adjacent to pin to suppress input ripple.
PIN5 (NC)	No Connection	Not internally bonded; must remain unconnected in PCB layout to avoid parasitic coupling.

Key Features

Feature	Design Value
Auto-Discharge Function	Internal 30Ω NMOS discharge path activates on EN low, rapidly draining VOUT capacitance to prevent latch-up in multi-rail systems.
Ultra-Low Noise Regulation	60µV_rms noise floor enables direct powering of RF synthesizers without additional LC filtering.
High PSRR at Low Frequencies	75dB rejection at 1kHz mitigates noise from PMIC switching frequencies and digital clock harmonics.
Thermal Protection	+150°C shutdown with +20°C hysteresis prevents damage during sustained overload or poor heatsinking.
Wide Input Range	1.7–5.25V operation supports direct connection to USB VBUS, Li-ion batteries, or intermediate DC-DC outputs.

Applications

RF Transceiver Power

Camera Module Bias

Use Scenario: Supplying LNA, mixer, and PLL blocks in Bluetooth/Wi-Fi 5/6 transceivers.

IC Role / Device Role / Timing Role: Low-noise, low-ripple 3.5V bias rail ensuring EVM compliance and receiver sensitivity.

Use Value: 60µV_rms noise and 75dB PSRR maintain >35dB ACLR in 802.11ax 2×2 MIMO operation.

Use Scenario: Providing analog supply to CMOS image sensor pixel arrays and ADC front-ends.

IC Role / Device Role / Timing Role: Stable 3.5V reference for sensor analog signal chain, minimizing fixed-pattern noise.

Use Value: ±1% accuracy and <0.3V dropout preserve dynamic range when powered from 3.7V nominal Li-ion.

Wireless Adapter Core

Portable Media Player Audio

Use Scenario: Regulating core voltage for dual-core ARM Cortex-M4 SoCs in USB-C wireless dongles.

IC Role / Device Role / Timing Role: Primary 3.5V domain regulator with enable control synchronized to host enumeration.

Use Value: 35µA quiescent current and fast EN turn-on (<200µs) reduce idle power and improve plug-and-play latency.

Use Scenario: Delivering clean power to Class-D audio amplifiers and DACs in handheld media players.

IC Role / Device Role / Timing Role: Low-noise post-regulator for audio subsystem, isolating amplifier from noisy system rails.

Use Value: 75dB PSRR suppresses 2MHz DC-DC switching artifacts that would otherwise manifest as audible beat tones.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-3502E/MB	300mA, 3.5V, ±2% accuracy, 65dB PSRR @ 1kHz, no auto-discharge, SOT23-5 package.	Lacks discharge function; requires external MOSFET for rapid VOUT decay in hot-swap scenarios.	Select when cost sensitivity outweighs need for integrated discharge and PSRR is acceptable at 65dB.
Torex XC6210B352MR-G	300mA, 3.5V, ±2% accuracy, 70dB PSRR @ 1kHz, 40µV_rms noise, SOT25 package, no discharge.	Lower noise than AP7343D but no discharge; thermal shutdown threshold is +145°C (5°C lower).	Prefer for ultra-low-noise audio bias where discharge is managed externally and tighter thermal margin is acceptable.

Compared with MCP1703T-3502E/MB and XC6210B352MR-G, the AP7343D-35W5-7 uniquely combines 75dB PSRR, 60µV_rms noise, ±1% accuracy, and integrated auto-discharge in SOT25 - making it optimal for space-constrained RF and imaging applications requiring rapid rail sequencing and minimal external components.

Availability

AP7343D-35W5-7 is available at Aetrix Electronics and suitable for RF transceiver power, camera module bias, and wireless adapter core regulation requiring stable component supply, automotive-grade reliability, and long-term production continuity.

Supply support for AP7343D-35W5-7 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-sensitive portable communications equipment including smartphones, tablets, and wireless infrastructure modules.

FAQ

What is the minimum input voltage required for AP7343D-35W5-7 to regulate 3.5V at 300mA?

The minimum input voltage is determined by dropout voltage: at 300mA, max dropout is 0.29V (SOT25), so VIN(min) = 3.5V + 0.29V = 3.79V. However, per Recommended Operating Conditions, VIN may be as low as 1.7V - but regulation only holds when VIN ≥ VOUT + dropout. Below 3.79V, output drops linearly.

Does AP7343D-35W5-7 require an external discharge resistor?

No. The "D" suffix denotes built-in auto-discharge: when EN is pulled low, an internal 30Ω NMOS connects VOUT to GND, discharging output capacitance without external components. This eliminates need for pull-down resistors and reduces BOM count and board area.

Can AP7343D-35W5-7 operate with only a 0.47µF input capacitor?

Yes - the datasheet specifies a minimum 0.47µF ceramic capacitor between VIN and GND. This value suffices for stability and input decoupling under typical load transients. For high-dV/dt loads or noisy sources, adding a 1–2.2µF bulk capacitor in parallel is recommended.

Is AP7343D-35W5-7 compliant with automotive AEC-Q100 standards?

No - the standard AP7343D-35W5-7 is not AEC-Q100 qualified. Diodes offers the AP7343Q variant (separate datasheet) for automotive applications, which undergoes extended temperature testing (−40°C to +125°C ambient), HTOL, and stress screening per AEC-Q100 Rev H.

AP7343D-35W5-7 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):: 3.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.29V @ 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-35W5-7 FAQ

1.How can I place an order for AP7343D-35W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7343D-35W5-7 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-35W5-7 reliable?

The price and inventory of AP7343D-35W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343D-35W5-7 is usually 5 days.

3.What payment methods are accepted for AP7343D-35W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-35W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7343D-35W5-7?

AP7343D-35W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7343D-35W5-7 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-35W5-7?

For technical support, including AP7343D-35W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-35W5-7 requirements.

6.How does Aetrix verify that AP7343D-35W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7343D-35W5-7 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-35W5-7 meets industry standards.

7.What is the process for return or replacement of AP7343D-35W5-7?

All AP7343D-35W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-35W5-7, 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-35W5-7 part is unused and in its original packaging.

Return procedure for AP7343D-35W5-7:

1.Submit a request within 90 days.

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

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