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

Diodes Incorporated AP131-25WL-7

Name: AP131-25WL-7
Brand: Diodes Incorporated
SKU: AP131-25WL-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP131-25WL-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP131-25WL-7.pdf

Description:: IC REG LINEAR 2.5V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

AP131-25WL-7 from Diodes Incorporated is a 300mA fixed-output (2.5V) low-dropout linear regulator in SOT25 package, featuring 400mV dropout at full load, 50µA quiescent current, and active-low enable control. It integrates current limiting, thermal shutdown, and bandgap reference with BP pin for noise reduction-designed for battery-powered wireless modules and PC peripherals.

For engineers reviewing the AP131-25WL-7 datasheet, AP131-25WL-7 pinout, AP131-25WL-7 application, or AP131-25WL-7 equivalent, key selection criteria include dropout voltage under 300mA load, ±2% output accuracy across temperature, EN pin logic thresholds, BP capacitor configuration for PSRR optimization, and SOT25 thermal resistance (163°C/W).

Technical Context

The AP131-25WL-7 uses a PMOS pass element with internal 1.5Ω R_ON, enabling stable regulation down to 400mV input–output differential at 300mA. Its error amplifier compares feedback from a precision 1.08V bandgap reference against the regulated output, delivering ±2% initial accuracy and 50ppm/°C temperature coefficient.

Enable functionality is implemented via an active-low EN pin with V_EN(OFF) ≤ 0.8V and V_EN(ON) ≥ 1.5V, supporting direct microcontroller GPIO control. The BP pin connects to an external 0.1µF capacitor to stabilize the bandgap reference and improve PSRR by up to 60dB at 100Hz.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.5V ±2% at 1mA–300mA, ensuring compatibility with 2.5V I/O domains and ADC references.
Dropout Voltage	400mV typ. at 300mA, allowing operation from 2.9V input in 3.3V-rail systems with margin.
Quiescent Current	50µA typ. at no load and 5V input, minimizing standby power loss in battery-critical designs.
PSRR	60dB at 100Hz with 1µF C_IN/10µF C_OUT, suppressing ripple from noisy DC-DC stages.
Thermal Shutdown	Activates at T_J ≥ +125°C, protecting device during sustained overload or poor PCB heatsinking.
Current Limit	450mA typ., providing fold-back short-circuit protection without latch-up behavior.
Enable Threshold	V_EN(OFF) ≤ 0.8V / V_EN(ON) ≥ 1.5V, compatible with 1.8V/3.3V logic families without level shifting.

Pinout & Package

SOT25 (5-pin, lead-free, halogen-free "Green" package) with 163°C/W junction-to-ambient thermal resistance on standard FR-4 PCB layout.

Pin/Terminal	Circuit Role	Design Meaning
1: IN	Input voltage supply	Accepts 2.7–5.5V; requires 1µF ceramic decoupling close to pin for stability.
2: EN	Active-low enable control	Pull high ≥1.5V to activate regulator; pull ≤0.8V to disable and reduce ground current to 5µA.
3: BP	Bandgap reference bypass	Connect 0.1µF capacitor to GND to reduce reference noise and improve PSRR above 10Hz.
4: OUT	Regulated output	Delivers 2.5V ±2% with ≤35mV load regulation from 1–300mA.
5: GND	Power and reference ground	Common return for IN, OUT, EN, and BP; must be low-impedance connection to minimize noise coupling.

Key Features

Feature	Design Value
Low quiescent current	50µA typical at zero load enables >1-year battery life in 10µA-system standby applications.
Fast transient response	Stabilizes within microseconds after 100mA load step, maintaining <1% output deviation without external compensation.
Integrated protection	Thermal shutdown and current limit prevent damage during fault conditions without external circuitry.
BP pin noise reduction	0.1µF BP capacitor reduces output noise floor by 20dB and improves PSRR by 15dB at 1kHz.
SOT25 footprint	Standard 5-pin SOT25 allows drop-in replacement of similar LDOs and supports automated assembly.

Applications

Wireless Sensor Node

USB Peripheral Controller

Use Scenario: Sub-100µA sleep-mode IoT sensor node powered by coin cell or Li-ion battery.

IC Role / Device Role / Timing Role: Primary 2.5V supply for MCU, RF transceiver, and analog front-end.

Use Value: 50µA quiescent current extends battery life; 400mV dropout enables operation until battery reaches 2.9V.

Use Scenario: USB 2.0 hub controller requiring clean 2.5V rail isolated from noisy 5V bus.

IC Role / Device Role / Timing Role: Post-regulator for USB PHY and interface logic, rejecting switching noise from upstream DC-DC.

Use Value: 60dB PSRR at 100Hz suppresses 5V-to-2.5V converter ripple; BP capacitor further lowers broadband noise.

Laptop Card Reader

Industrial Data Acquisition Module

Use Scenario: SD/MMC card interface on ultrabook motherboard with shared 3.3V rail.

IC Role / Device Role / Timing Role: Local 2.5V LDO for card controller I/O, decoupled from main system rail.

Use Value: ±2% output accuracy ensures reliable signal integrity; fast load transient response prevents data corruption during card insertion.

Use Scenario: 16-bit ADC subsystem in programmable logic controller requiring low-noise analog supply.

IC Role / Device Role / Timing Role: Dedicated 2.5V reference and analog supply for precision ADC and PGA.

Use Value: BP pin filtering reduces output noise to <10µV_RMS, preserving ENOB in 16-bit conversion.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7343-25W5-7	Higher 500mA rating, 250mV dropout at 300mA, 35µA IQ, same SOT25 package	Better suited for higher-current loads; not recommended for new designs per Diodes' datasheet note	Select if >300mA peak current or lower dropout is required; verify lifecycle status before design-in.
MCP1700T-2502E/TT	250mA max, 600mV dropout at 250mA, 1.6µA IQ, SOT23-5 package	Ultra-low IQ ideal for energy harvesting; lower current capability limits use in burst-mode loads	Prefer for multi-year battery applications where average load <100mA; verify thermal derating at 300mA.

Compared with AP7343-25W5-7 and MCP1700T-2502E/TT, the AP131-25WL-7 balances moderate current (300mA), ultra-low noise (via BP pin), and proven thermal robustness in SOT25-making it optimal for cost-sensitive, medium-current portable designs where PSRR and accuracy outweigh minimum IQ requirements.

Availability

AP131-25WL-7 is available at Aetrix Electronics and suitable for wireless sensor nodes, USB peripheral controllers, laptop card readers, and industrial data acquisition modules requiring stable component supply and RoHS-compliant packaging.

Supply support for AP131-25WL-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The AP131 series belongs to Diodes' precision LDO portfolio, engineered for battery-powered and noise-sensitive applications where low dropout, low IQ, and integrated protection are essential.

FAQ

What is the maximum input voltage for AP131-25WL-7?

The absolute maximum input voltage is +6V, but recommended operating range is 2.7V to 5.5V. Exceeding 5.5V risks permanent damage even for brief transients. Input voltage must remain ≥ (2.5V + dropout) to maintain regulation-e.g., ≥2.9V at 300mA load. Thermal derating applies above 85°C ambient.

Can the BP pin be left unconnected?

No-leaving BP floating degrades PSRR and increases output noise. A 0.1µF X7R ceramic capacitor must be placed between BP and GND, located within 2mm of the pin. This capacitor stabilizes the internal bandgap reference and improves ripple rejection by up to 20dB across 10Hz–100kHz.

Does AP131-25WL-7 support reverse polarity protection?

No-AP131-25WL-7 lacks built-in reverse-voltage protection. Applying negative voltage to IN or OUT relative to GND may cause latch-up or permanent damage. External protection (e.g., series Schottky diode or MOSFET-based circuit) is required in systems prone to reverse battery insertion or hot-swap events.

How does thermal shutdown behave during continuous overload?

When junction temperature exceeds +125°C, thermal shutdown disables the pass transistor and pulls OUT to near-GND. The device remains latched off until T_J falls below +110°C (typ.), then automatically recovers. This cycle repeats under sustained overload, limiting average power dissipation and preventing catastrophic failure.

AP131-25WL-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

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

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.5V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 100 µA

Current - Supply (Max):: -

PSRR:: 60dB (100Hz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-25

AP131-25WL-7 FAQ

1.How can I place an order for AP131-25WL-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP131-25WL-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 AP131-25WL-7 reliable?

The price and inventory of AP131-25WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-25WL-7 is usually 5 days.

3.What payment methods are accepted for AP131-25WL-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-25WL-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP131-25WL-7?

AP131-25WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP131-25WL-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 AP131-25WL-7?

For technical support, including AP131-25WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-25WL-7 requirements.

6.How does Aetrix verify that AP131-25WL-7 is sourced from the original manufacturer or authorized distributors?

All AP131-25WL-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 AP131-25WL-7 meets industry standards.

7.What is the process for return or replacement of AP131-25WL-7?

All AP131-25WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-25WL-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 AP131-25WL-7 part is unused and in its original packaging.

Return procedure for AP131-25WL-7:

1.Submit a request within 90 days.

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

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