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

Diodes Incorporated AP131-15WL-7

Name: AP131-15WL-7
Brand: Diodes Incorporated
SKU: AP131-15WL-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP131-15WL-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP131-15WL-7.pdf

Description:: IC REG LDO 1.5V 0.3A SOT25

Quantity:: RFQ Add To RFQ list

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Inventory:175

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Product details

Overview

AP131-15WL-7 from Diodes Incorporated is a 300mA, fixed 1.5V output, low dropout linear regulator in SOT25 package with active-low enable (EN), bandgap bypass (BP), and thermal/current protection. It delivers 400mV dropout at full load, draws only 50µA quiescent current, and operates from 2.7V to 5.5V input-ideal for battery-powered wireless modules and PC peripherals requiring stable low-voltage bias.

For engineers reviewing the AP131-15WL-7 datasheet, AP131-15WL-7 pinout, AP131-15WL-7 application, or AP131-15WL-7 equivalent, key selection factors include its 1.5V ±2% output accuracy, EN-controlled shutdown, BP-pin noise reduction capability, and SOT25 thermal performance (θ_JA = 163°C/W) under continuous 300mA load.

Technical Context

The AP131-15WL-7 integrates a PMOS pass element with internal 1.5Ω R_ON, error amplifier, precision 1.08V bandgap reference, and fold-back current limiting. Its enable logic is active-low, requiring <0.8V on EN to disable output and >1.5V to activate.

Output noise is reduced via an external capacitor on the BP pin, and transient response is optimized for fast load steps up to 300mA. Line regulation is 0.1–0.3%/V and load regulation is 30–35mV across 1–300mA, supporting stable operation in dynamically loaded systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.5V ±2% - ensures precise core/bias rail for low-voltage logic and RF ICs
Max Output Current	300mA - supports moderate-power microcontrollers and interface ICs without derating
Dropout Voltage	400mV typ. at 300mA - enables operation down to 1.9V input for single-cell Li-ion or 2xAA applications
Quiescent Current	50µA typ. - minimizes standby drain in always-on battery systems
Input Voltage Range	2.7V to 5.5V - compatible with USB, Li-ion, and regulated 3.3V/5V rails
PSRR	60dB at 100Hz - suppresses ripple from noisy switchers or shared power domains
Thermal Shutdown	Active at T_J > +125°C - protects against sustained overload or poor PCB heatsinking

Pinout & Package

SOT25 (5-pin, lead-free, RoHS-compliant) with 1.6mm × 2.8mm footprint and 0.95mm height. Exposed pad not present; thermal path relies on copper area under pins 2 (EN), 3 (BP), and 5 (GND).

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input voltage supply	Accepts 2.7–5.5V; requires ≥1µF ceramic input capacitor for stability
2 (EN)	Enable control (active-low)	Pull ≤0.8V to disable output; drives <0.1µA leakage when asserted
3 (BP)	Bandgap reference bypass	Connect 0.1µF capacitor to reduce output noise and improve PSRR
4 (OUT)	Regulated output	Delivers 1.5V ±2%; requires ≥10µF ceramic output capacitor for transient response
5 (GND)	Power ground reference	Common return for IN, OUT, EN, and BP; must be low-impedance connection to minimize noise

Key Features

Feature	Design Value
Low quiescent current	50µA over full load range - extends battery life in sleep-mode IoT sensors
Fast enable delay	8µs typical with 0.1µF BP cap - supports rapid power sequencing in multi-rail systems
Short-circuit fold-back	Limits output current to 150–300mA during fault - prevents thermal runaway and PCB damage
Green packaging	Halogen- and antimony-free SOT25 - meets IPC-1752A Class 2 material declarations

Applications

Battery-Powered Wireless Module

PC Peripheral Power Rail

Use Scenario: Powering BLE/Wi-Fi SoCs (e.g., ESP32, nRF52) from single Li-ion or coin cell.

IC Role / Device Role / Timing Role: Primary 1.5V LDO for RF transceiver bias and digital core logic.

Use Value: 50µA quiescent current preserves battery capacity during deep-sleep cycles; 400mV dropout allows operation down to 1.9V input.

Use Scenario: Providing clean 1.5V supply to DDR memory termination or USB PHY circuitry on add-in cards.

IC Role / Device Role / Timing Role: Low-noise post-regulator after DC-DC converter.

Use Value: BP-pin decoupling reduces output noise to <10µV_RMS; 60dB PSRR rejects switching noise from upstream buck converters.

Optical Drive Logic Bias

LAN Card PHY Interface

Use Scenario: Supplying 1.5V to laser diode driver control logic and servo amplifiers in CD/DVD drives.

IC Role / Device Role / Timing Role: Stable bias source for analog front-end and motor control ICs.

Use Value: ±2% output accuracy ensures consistent laser power calibration; thermal shutdown prevents latch-up during mechanical stall events.

Use Scenario: Powering Ethernet PHY I/O buffers and MDI interface circuitry in 10/100BASE-TX LAN cards.

IC Role / Device Role / Timing Role: Dedicated low-dropout regulator for PHY analog supply domain.

Use Value: 30–35mV load regulation maintains signal integrity across PHY link training; SOT25 footprint fits tight card-edge layouts.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7343-15W5-7	Higher 500mA rating, 300mV dropout at 300mA, no BP pin	Better for higher-current loads but lacks BP-based noise filtering	Select when >300mA output or lower dropout is required; omit if BP noise suppression is critical
MCP1700T-1502E/TT	250mA max, 175mV dropout at 250mA, 1.6µA quiescent current	Ultra-low IQ ideal for energy-harvesting, but lower current capability	Select for sub-250mA, ultra-low-power sensor nodes where 50µA is excessive

Compared with AP7343-15W5-7 and MCP1700T-1502E/TT, the AP131-15WL-7 uniquely balances 300mA delivery, 50µA IQ, and BP-enabled noise control-making it optimal for mid-power wireless and peripheral designs where both efficiency and signal integrity matter.

Availability

AP131-15WL-7 is available at Aetrix Electronics and suitable for battery-powered wireless modules, PC peripheral power rails, optical drive logic bias, and LAN card PHY interface applications requiring stable component supply and long-term manufacturability.

Supply support for AP131-15WL-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 AP131 series targets cost-sensitive, space-constrained portable electronics needing reliable fixed-output LDOs with integrated protection and low-noise features-designed specifically for battery-powered and peripheral subsystems.

FAQ

What is the minimum input voltage required for 1.5V output at 300mA?

The AP131-15WL-7 requires at least 1.9V input (1.5V + 0.4V dropout) to maintain regulation at full 300mA load. Below 1.9V, output voltage drops linearly with input; operation below 2.7V is outside recommended conditions per datasheet Section 5.

Can the BP pin be left unconnected?

Yes, the BP pin may be left floating or tied directly to GND if noise reduction is not required. However, connecting a 0.1µF ceramic capacitor between BP and GND improves PSRR by up to 15dB and reduces output noise-recommended for RF or high-precision analog circuits.

Is AP131-15WL-7 pin-compatible with other AP131 variants?

Yes-all AP131 variants (e.g., -18WL-7, -33WL-7) share identical SOT25 pinout and electrical behavior except for output voltage. The EN, BP, IN, OUT, and GND terminals map identically; only the marking code and internal feedback network differ.

Does this device support reverse polarity protection?

No, the AP131-15WL-7 has no built-in reverse polarity protection. Applying negative voltage to IN or OUT relative to GND may cause irreversible damage. External protection (e.g., series Schottky diode or MOSFET-based reverse-blocking circuit) is required in systems prone to incorrect battery insertion or field servicing.

AP131-15WL-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 1.5V

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

AP131-15WL-7 FAQ

1.How can I place an order for AP131-15WL-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP131-15WL-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 AP131-15WL-7 reliable?

The price and inventory of AP131-15WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-15WL-7 is usually 5 days.

3.What payment methods are accepted for AP131-15WL-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-15WL-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP131-15WL-7?

AP131-15WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP131-15WL-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 AP131-15WL-7?

For technical support, including AP131-15WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-15WL-7 requirements.

6.How does Aetrix verify that AP131-15WL-7 is sourced from the original manufacturer or authorized distributors?

All AP131-15WL-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 AP131-15WL-7 meets industry standards.

7.What is the process for return or replacement of AP131-15WL-7?

All AP131-15WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-15WL-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 AP131-15WL-7 part is unused and in its original packaging.

Return procedure for AP131-15WL-7:

1.Submit a request within 90 days.

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

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