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

Diodes Incorporated AP7331-25SNG-7

Name: AP7331-25SNG-7
Brand: Diodes Incorporated
SKU: AP7331-25SNG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7331-25SNG-7

Manufacturer:: Diodes Incorporated

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

Package:: 6-UDFN Exposed Pad

Datasheet:: AP7331-25SNG-7.pdf

Description:: IC REG LIN 2.5V 300MA 6DFN2020

Quantity:: RFQ Add To RFQ list

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Inventory:3,398

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Product details

Overview

AP7331-25SNG-7 from Diodes Incorporated is a fixed-output 2.5V, 300mA low-dropout linear regulator in DFN2020-6 package, featuring 65μA quiescent current, 300mV typical dropout at full load, and fast 80μs startup - designed for power-sensitive applications including wireless LAN cards and battery-powered instrumentation.

For engineers reviewing the AP7331-25SNG-7 datasheet, AP7331-25SNG-7 pinout, AP7331-25SNG-7 application, or AP7331-25SNG-7 equivalent, key selection criteria include low-I_Q operation across 2–6V input range, ±2% output voltage accuracy over –40°C to +85°C, PSRR of 65dB at 100Hz, and compatibility with 1μF ceramic output capacitors.

Technical Context

The AP7331-25SNG-7 integrates a PMOS pass element, precision 0.4V bandgap reference, error amplifier, thermal shutdown (140°C trip), and foldback current limiting (400–600mA). Its EN pin enables logic-controlled on/off functionality with VIH ≥1.4V and VIL ≤0.4V.

Designed for stability with low-ESR ceramic capacitors, it delivers excellent line and load transient response without requiring minimum load current. The fixed 2.5V output eliminates external feedback resistors, simplifying layout while maintaining <±0.6% load regulation from 1mA to 300mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±2% over –40°C to +85°C - ensures stable core voltage for 2.5V I/O interfaces and analog subsystems.
Max Output Current	300mA continuous - supports moderate-power microcontrollers, RF front-ends, and sensor signal chains.
Quiescent Current	65μA typical at full load - extends battery life in always-on portable devices such as IoT edge nodes.
Dropout Voltage	300mV typical at 300mA - enables regulation from 2.8V input down to 2.5V output, critical for single-cell Li-ion or Li-poly systems.
PSRR	65dB typical at 100Hz - suppresses low-frequency supply noise from switching regulators or noisy DC-DC stages.
Startup Time	80μs - allows rapid wake-up from deep-sleep modes in energy-harvesting and ultra-low-power MCU applications.
Thermal Shutdown	140°C with 15°C hysteresis - provides self-recovery protection during sustained overload or poor PCB thermal design.

Pinout & Package

AP7331-25SNG-7 uses the DFN2020-6 (2.0mm × 2.0mm, 0.65mm pitch) package with wettable flank leads for automated optical inspection. Pin 1 (EN) is top-left when marking dot is oriented top-left; pin 6 (NC) is not internally connected.

Pin/Terminal	Circuit Role	Design Meaning
IN (Pin 3)	Input voltage supply	Accepts 2V–6V; requires ≥1μF ceramic bypass capacitor placed adjacent to pin for noise immunity and stability.
GND (Pin 2)	Power ground reference	Must be connected to low-impedance PCB ground plane; shares thermal pad for junction-to-board heat transfer.
EN (Pin 1)	Enable control input	Active-high logic interface; drives regulator ON when ≥1.4V, OFF when ≤0.4V; ties to IN if always-on operation required.
OUT (Pin 4)	Regulated output	Delivers 2.5V ±2%; requires ≥1μF X7R/X5R ceramic capacitor directly between OUT and GND for transient stability.
NC (Pin 5 & 6)	No connection	Pins 5 and 6 are unconnected die pads - must remain floating; no routing or soldering required.

Key Features

Feature	Design Value
Ultra-low quiescent current	65μA at full 300mA load - reduces standby power loss by >5× versus standard LDOs, enabling multi-year battery life in coin-cell applications.
Fast transient response	Stable output during 0→300mA load steps with minimal overshoot/undershoot - eliminates need for oversized output capacitance in GSM/Bluetooth baseband supplies.
Low-ESR capacitor compatibility	Stable with 1μF ceramic output caps (10–200mΩ ESR) - avoids costly tantalum or polymer capacitors and saves board space.
Integrated protection	Current limit (400–600mA), short-circuit clamp (~100mA), and thermal shutdown (140°C) - prevents field failures without external circuitry.
Green packaging	RoHS-compliant, halogen-free molding compound (no Br/Sb) - meets environmental compliance requirements for global electronics markets.

Applications

Wireless LAN Cards

XDSL Routers

Use Scenario: Powering 2.5V WLAN chipset RF sections and baseband processors in compact PCIe Mini Card modules.

IC Role / Device Role / Timing Role: Primary 2.5V LDO supplying noise-sensitive RF synthesizers and ADC/DAC blocks.

Use Value: 65dB PSRR at 100Hz rejects switching noise from upstream DC-DC converters, preventing EVM degradation in 802.11ac transmission.

Use Scenario: Regulating 2.5V supply for DSL line drivers and analog front-end (AFE) circuits in residential gateways.

IC Role / Device Role / Timing Role: Low-noise post-regulator after buck converter, ensuring clean bias for high-speed line drivers.

Use Value: Fast 80μs startup synchronizes with PHY initialization sequence, eliminating boot delays in auto-negotiation handshakes.

Notebook Computers

Battery-Powered Equipment

Use Scenario: Providing 2.5V rail for embedded controller (EC) peripherals and smart battery management ICs.

IC Role / Device Role / Timing Role: Always-on LDO powered from main battery, enabling real-time battery gauging and system wake events.

Use Value: 65μA I_Q minimizes parasitic drain during suspend-to-RAM, extending standby time beyond 30 days on single-cell Li-ion.

Use Scenario: Supplying 2.5V to portable medical sensors (e.g., pulse oximeters) and handheld test instruments.

IC Role / Device Role / Timing Role: Main system LDO delivering regulated power to mixed-signal ASICs and precision ADC references.

Use Value: ±2% output accuracy and <±0.6% load regulation ensure consistent measurement repeatability across battery discharge curve (3.0V–4.2V).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-2502E/TO	250mA max output, 1.6μA I_Q, SOT23-5 package - lower current rating and significantly lower quiescent current.	Best suited for ultra-low-power sensor nodes where 250mA is sufficient and sub-2μA sleep current is mandatory.	Select MCP1700 only if load current ≤250mA and nanoscale I_Q outweighs need for 300mA headroom and DFN thermal performance.
Torex XC6206P252MR-G	250mA max, 1μA I_Q, SOT23-5 - similar ultra-low I_Q but lacks EN pin and thermal shutdown.	Applicable in cost-sensitive, non-safety-critical consumer devices where enable control and fault protection are omitted.	Choose XC6206 only when EN functionality and integrated thermal/current protection are unnecessary, and SOT23 footprint is preferred.

Compared with MCP1700-2502E/TO and XC6206P252MR-G, AP7331-25SNG-7 uniquely balances 300mA drive capability, 65μA active I_Q, EN control, and full protection suite in a thermally efficient DFN2020-6 package - making it optimal for mid-power portable systems requiring both efficiency and robustness.

Availability

AP7331-25SNG-7 is available at Aetrix Electronics and suitable for wireless LAN cards, XDSL routers, and battery-powered instrumentation requiring stable component supply, RoHS-compliant green packaging, and production-ready tape-and-reel delivery (3000 units per reel).

Supply support for AP7331-25SNG-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and communications markets.

The AP7331 series belongs to Diodes' low-quiescent-current LDO portfolio, engineered specifically for battery-constrained and noise-sensitive applications where fast transient response, minimal dropout, and integrated fault protection are essential.

FAQ

What is the minimum input voltage required for AP7331-25SNG-7 to maintain 2.5V output at 300mA?

The minimum input voltage is calculated as V_OUT + V_DROP = 2.5V + 0.3V = 2.8V under typical conditions. Absolute minimum VIN is 2.0V per datasheet, but regulation fails below 2.8V at full load due to dropout constraints. For guaranteed 2.5V output at 300mA, VIN must be ≥2.8V.

Can AP7331-25SNG-7 operate without an output capacitor?

No. The device requires a minimum 1μF ceramic output capacitor (X5R/X7R, 10–200mΩ ESR) between OUT and GND for stability and transient response. Omitting it causes oscillation, excessive ripple, and potential thermal shutdown. No-load stability is maintained, but capacitor is mandatory.

Is the NC pin (Pin 5 & 6) on AP7331-25SNG-7 electrically isolated or thermally connected?

Pins 5 and 6 are true no-connect terminals - they are not bonded to any internal circuitry or die substrate. They are electrically isolated and thermally disconnected. Neither pin should be soldered, routed, or tied to GND/VIN; leaving them floating is required per datasheet layout guidance.

Does AP7331-25SNG-7 support reverse polarity protection on the input pin?

No. The device lacks internal reverse-voltage protection. Applying reversed polarity to the IN pin can damage the internal PMOS pass transistor and bandgap circuitry. External protection (e.g., series Schottky diode or ideal diode controller) must be added if reverse input is possible in the system.

AP7331-25SNG-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-UDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.55V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 75 µA

Current - Supply (Max):: 85 µA

PSRR:: 65dB (100Hz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: U-DFN2020-6

AP7331-25SNG-7 FAQ

1.How can I place an order for AP7331-25SNG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7331-25SNG-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 AP7331-25SNG-7 reliable?

The price and inventory of AP7331-25SNG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7331-25SNG-7 is usually 5 days.

3.What payment methods are accepted for AP7331-25SNG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7331-25SNG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7331-25SNG-7?

AP7331-25SNG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7331-25SNG-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 AP7331-25SNG-7?

For technical support, including AP7331-25SNG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7331-25SNG-7 requirements.

6.How does Aetrix verify that AP7331-25SNG-7 is sourced from the original manufacturer or authorized distributors?

All AP7331-25SNG-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 AP7331-25SNG-7 meets industry standards.

7.What is the process for return or replacement of AP7331-25SNG-7?

All AP7331-25SNG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7331-25SNG-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 AP7331-25SNG-7 part is unused and in its original packaging.

Return procedure for AP7331-25SNG-7:

1.Submit a request within 90 days.

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

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