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

Diodes Incorporated AP7331-25WG-7

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

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Part No.:: AP7331-25WG-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP7331-25WG-7.pdf

Description:: IC REG LINEAR 2.5V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7331-25WG-7 from Diodes Incorporated is a fixed-output 2.5V, 300mA low-dropout linear regulator in SOT25 package with enable control, 65μA quiescent current, 300mV dropout at full load, and fast 80μs startup-designed for battery-powered wireless LAN cards and XDSL routers requiring stable low-power voltage regulation.

For engineers reviewing the AP7331-25WG-7 datasheet, AP7331-25WG-7 pinout, AP7331-25WG-7 application, or AP7331-25WG-7 equivalent, key selection criteria include dropout voltage under 300mA load, EN logic thresholds (VIH = 1.4V, VIL = 0.4V), PSRR of 65dB at 100Hz, thermal shutdown at 140°C, and compatibility with 1μF ceramic output capacitors.

Technical Context

The AP7331-25WG-7 integrates a PMOS pass transistor, bandgap reference (0.4V), error amplifier, current-limit circuit (400–600mA), and thermal shutdown (140°C trip, 15°C hysteresis). Its architecture enables stable regulation without minimum load and supports fast transient response due to optimized internal compensation.

It operates across 2V–6V input, delivers ±2% output accuracy over –40°C to +85°C ambient, and maintains 65μA quiescent current across full load (0–300mA) and input range-enabling ultra-low-power standby modes in portable systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±2% over temperature and load-ensures precise rail generation for 2.5V logic and analog circuitry.
Max Output Current	300mA continuous-supports moderate-power RF front-ends and baseband ICs in wireless modules.
Quiescent Current	65μA typical at full load-minimizes battery drain during active operation in always-on IoT nodes.
Dropout Voltage	300mV typical at 300mA-enables regulation from 2.8V input down to 2.5V output, extending usable battery voltage range.
PSRR	65dB at 100Hz-suppresses low-frequency power supply noise from switching converters feeding the LDO input.
Startup Time	80μs-allows rapid wake-up from deep sleep in time-critical GSM/TDMA burst-mode applications.
Thermal Shutdown	140°C junction trip with 15°C hysteresis-prevents permanent damage during sustained overload or poor PCB thermal design.

Pinout & Package

SOT25 package (2.9mm × 2.8mm × 1.3mm), RoHS-compliant, green molding compound, lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
1 - IN	Input voltage supply	Accepts 2V–6V; requires ≥1μF ceramic bypass capacitor placed adjacent to pin for stability and noise rejection.
2 - GND	Power ground reference	Common return path for input/output currents; must connect to low-impedance ground plane to minimize noise coupling.
3 - EN	Enable control input	Active-high logic interface (VIH ≥ 1.4V, VIL ≤ 0.4V); ties to IN for always-on operation or microcontroller GPIO for dynamic power gating.
4 - NC	No connection	Internally unconnected; must remain floating-no external bias or routing permitted.
5 - OUT	Regulated output	Delivers stable 2.5V; requires ≥1μF ceramic capacitor (X5R/X7R, 10–200mΩ ESR) placed within 2mm of pin for transient response and stability.

Key Features

Feature	Design Value
Low-I_Q across load range	65μA at 300mA ensures <1% battery drain in 100μA-system standby, critical for multi-year coin-cell operation.
Fast transient response	Stable 2.5V output during 1mA↔300mA load steps with minimal overshoot/undershoot-supports burst-mode DSP and RF ICs.
Ultra-fast startup	80μs enable-to-regulation time enables real-time power cycling in TDMA-based cellular protocols.
Integrated protection	Current limit (≈600mA), short-circuit clamp (≈100mA), and thermal shutdown (140°C) eliminate need for external fault management circuitry.
Capacitor flexibility	Stable with 1–4.7μF ceramic output caps (ESR 10–200mΩ)-reduces BOM count and board space vs. electrolytic-dependent LDOs.

Applications

Wireless LAN Cards

XDSL Routers

Use Scenario: Powering 2.5V WLAN baseband ICs and RF transceivers in mini-PCIe and M.2 form-factor adapters.

IC Role / Device Role / Timing Role: Primary 2.5V rail regulator with enable control synchronized to host PCIe link state transitions.

Use Value: 65μA I_Q extends adapter battery life during Wi-Fi scan/idle cycles; 80μs startup aligns with PCIe ASPM L1 substates.

Use Scenario: Supplying 2.5V PHY layer and ADSL line driver ICs in residential DSL gateways.

IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from noisy 3.3V switching supply, rejecting upstream SMPS ripple.

Use Value: 65dB PSRR at 100Hz suppresses 100kHz–1MHz switching noise from primary DC/DC converter, preventing DSL signal corruption.

Battery-Powered Test Equipment

Notebook Subsystems

Use Scenario: Regulating 2.5V for precision ADC reference buffers and sensor signal chains in handheld multimeters.

IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source with zero-load stability for high-accuracy analog front-ends.

Use Value: ±2% output accuracy and <0.2%/V line regulation ensure measurement repeatability across depleting Li-ion battery (4.2V→3.0V).

Use Scenario: Powering 2.5V DDR memory termination and clock buffer ICs in ultrabook memory subsystems.

IC Role / Device Role / Timing Role: Local point-of-load regulator enabling independent power gating of memory channels during CPU C-states.

Use Value: EN pin allows firmware-controlled rail disable during deep-sleep states, reducing system-wide leakage by >50μA per channel.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-quiescent-current LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-2502E/TO	250mA max output, 1.6μA I_Q, no EN pin, TO-92 package	Lacks enable control and current capability for burst-mode loads; suited only for static low-power sensors	Select when ultra-low I_Q dominates and enable functionality is unnecessary.
Torex XC6206P252MR-G	250mA, 12μA I_Q, no thermal shutdown, SOT-23 package	Missing thermal protection limits use in thermally constrained enclosures; lower I_Q benefits long-term storage	Choose for shelf-life-critical applications where thermal risk is mitigated by mechanical design.

Compared with MCP1700-2502E/TO and XC6206P252MR-G, the AP7331-25WG-7 uniquely balances 300mA drive, 65μA I_Q, integrated EN, and full protection suite-making it optimal for dynamically powered wireless and broadband infrastructure where reliability and responsiveness are co-prioritized.

Availability

AP7331-25WG-7 is available at Aetrix Electronics and suitable for wireless LAN cards, XDSL routers, and battery-powered test equipment requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for AP7331-25WG-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 devices, with emphasis on power management, signal integrity, and protection solutions.

The AP7331 belongs to Diodes' low-quiescent-current LDO family, engineered specifically for energy-constrained portable and communications equipment where extended battery life and fast dynamic response are essential.

FAQ

What is the minimum input voltage required for stable 2.5V output at 300mA?

The AP7331-25WG-7 requires VIN ≥ 2.8V to maintain regulation at 300mA load, based on its 300mV typical dropout voltage. Below 2.8V, output voltage drops linearly with input; operation below 2V absolute maximum rating is prohibited and may cause malfunction.

Can the EN pin be left unconnected, or does it require a pull-up?

The EN pin must not be left floating-it requires a defined logic level. For always-on operation, tie EN directly to IN. For controlled enable, drive with a GPIO capable of meeting VIH ≥ 1.4V and VIL ≤ 0.4V; a 100kΩ pull-up to IN is acceptable but adds 0.01μA leakage.

Is a minimum load required for output stability?

No minimum load is required. The AP7331-25WG-7 remains stable and regulated from 0mA to 300mA output current, verified across –40°C to +85°C ambient. This eliminates need for dummy loads in low-power sleep states.

What is the recommended PCB layout for optimal thermal performance in SOT25?

Use a minimum 25mm² copper pour connected to Pin 2 (GND) on the top layer, with ≥2 thermal vias (0.3mm diameter) to an internal or bottom-layer solid ground plane. Avoid narrow traces on IN and OUT; keep output capacitor within 2mm of OUT/GND pins to minimize loop inductance.

AP7331-25WG-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):: 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:: SOT-25

AP7331-25WG-7 FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your AP7331-25WG-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 AP7331-25WG-7?

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

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

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

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

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

Return procedure for AP7331-25WG-7:

1.Submit a request within 90 days.

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

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