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

Diodes Incorporated AP131-29WL-7

Name: AP131-29WL-7
Brand: Diodes Incorporated
SKU: AP131-29WL-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP131-29WL-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP131-29WL-7.pdf

Description:: IC REG LINEAR 2.9V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Inventory:4,016

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Product details

Overview

AP131-29WL-7 from Diodes Incorporated is a 300mA fixed-output low-dropout linear regulator with 2.9V output, 400mV dropout at full load, 50µA quiescent current, and active-low enable control. It integrates current limiting, thermal shutdown, and bandgap reference in a SOT25 package, designed for battery-powered wireless modules requiring stable low-noise voltage regulation.

For engineers reviewing the AP131-29WL-7 datasheet, AP131-29WL-7 pinout, AP131-29WL-7 application, or AP131-29WL-7 equivalent, key selection criteria include dropout performance at 300mA, EN pin logic polarity, BP pin noise-filtering capability, output accuracy (±2%), and SOT25 thermal resistance (163°C/W).

Technical Context

The AP131-29WL-7 employs a PMOS pass transistor with 1.5Ω on-resistance, enabling low dropout and zero base-drive current. Its error amplifier compares feedback from an internal 1.08V bandgap reference to regulate output precisely across line (0.1%/V) and load (30mV) variations.

Enable functionality is implemented via an active-low EN pin with 0.8V max threshold for OFF state and 1.5V min for ON state; a 0.1µF capacitor on the BP pin reduces output noise by stabilizing the internal reference, improving PSRR to 60dB at 100Hz.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.9V ±2% - ensures stable core voltage for 3.0V-tolerant microcontrollers and RF ICs
Dropout Voltage	400mV at 300mA - enables operation down to 3.3V input when powering 2.9V loads
Quiescent Current	50µA typical - minimizes standby power loss in always-on battery applications
Input Voltage Range	2.7V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), LiFePO₄, and 3.3V/5V rails
Thermal Shutdown	Activated at ~150°C junction - protects device during sustained overload or poor PCB heatsinking
PSRR	60dB at 100Hz - suppresses ripple from switching DC/DC stages upstream of LDO
Current Limit	350–450mA - provides fold-back short-circuit protection without latch-up

Pinout & Package

SOT25 (5-pin, 2.8mm × 2.9mm × 1.3mm) surface-mount package with exposed pad for thermal enhancement; RoHS-compliant, halogen-free "Green" molding compound.

Pin/Terminal	Circuit Role	Design Meaning
1: IN	Regulator Input	Accepts 2.7–5.5V supply; requires ≥1µF ceramic input capacitor for stability
2: EN	Enable Control	Active-low logic input; <0.8V = OFF, >1.5V = ON; draws <0.1µA
3: BP	Bandgap Bypass	Connects 0.1µF capacitor to reduce reference noise and improve PSRR
4: OUT	Regulated Output	Delivers up to 300mA at 2.9V ±2%; requires ≥10µF ceramic output capacitor
5: GND	Power Ground	Common return path for IN, OUT, and internal circuitry; ties to thermal pad

Key Features

Feature	Design Value
Low Quiescent Current	50µA over full load range - extends battery life in IoT sensors with multi-year duty cycles
Fast Transient Response	Stabilizes within microseconds after load step - maintains voltage integrity during MCU wake-up bursts
Short-Circuit Fold-Back	Limits output current to 150–300mA under fault - prevents thermal runaway during output shorts
Integrated Thermal Shutdown	Auto-recovery after cooldown - eliminates need for external reset circuitry in embedded systems
BP Pin Noise Filtering	Enables 0.1µF bypass to suppress 1/f noise - improves ADC reference stability in mixed-signal designs

Applications

Wireless Sensor Node

USB-Powered Peripheral

Use Scenario: Sub-GHz or BLE sensor node powered by CR2032 or single Li-ion cell with intermittent transmit bursts.

IC Role / Device Role / Timing Role: Primary 2.9V supply for RF transceiver and ultra-low-power MCU during active transmission.

Use Value: 50µA quiescent current preserves battery capacity during 99% sleep time; 400mV dropout allows operation until battery drops to 3.3V.

Use Scenario: USB 3.3V bus-powered card reader or HID device with strict inrush and EMI limits.

IC Role / Device Role / Timing Role: Clean post-regulation stage isolating noisy USB switcher output from sensitive logic and interface circuits.

Use Value: 60dB PSRR at 100Hz attenuates switching ripple; BP pin filtering further reduces broadband noise affecting USB PHY timing.

Industrial Data Logger

Embedded Display Module

Use Scenario: Battery-backed data acquisition unit logging temperature/humidity at 10s intervals in remote locations.

IC Role / Device Role / Timing Role: Stable 2.9V rail for precision analog front-end (AFE) and EEPROM write operations.

Use Value: ±2% output accuracy and 50ppm/°C tempco ensure consistent ADC reference voltage across -40°C to +85°C operating range.

Use Scenario: Small OLED or segment LCD module driven by ASIC requiring tightly regulated 2.9V bias.

IC Role / Device Role / Timing Role: Low-noise local regulator decoupling display driver IC from shared system rail.

Use Value: Fast transient response prevents visible flicker during display refresh; SOT25 footprint fits tight board space constraints.

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
AP7343-29W5-7	Higher 500mA rating, 300mV dropout at 300mA, no BP pin	Better for higher-current loads; lacks BP noise filtering for precision analog use	Select when >300mA peak load required and noise sensitivity is low
MCP1700T-2902E/TT	250mA rating, 600mV dropout at 250mA, 1.6µA quiescent current	Ultra-low IQ ideal for energy-harvesting, but lower current and higher dropout limit dynamic headroom	Select only for sub-250mA, ultra-low-power applications where dropout margin >600mV is acceptable

Compared with AP7343-29W5-7 and MCP1700T-2902E/TT, the AP131-29WL-7 uniquely balances 300mA capability, 400mV dropout, 50µA IQ, and BP-based noise reduction-making it optimal for battery-powered RF and mixed-signal systems needing both efficiency and signal integrity.

Availability

AP131-29WL-7 is available at Aetrix Electronics and suitable for wireless sensor nodes, USB peripherals, industrial data loggers, and embedded display modules requiring stable component supply with guaranteed long-term sourcing.

Supply support for AP131-29WL-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 consumer markets.

The AP131 series belongs to Diodes' low-quiescent-current LDO portfolio, engineered specifically for battery-constrained and noise-sensitive applications where dropout, accuracy, and thermal robustness are critical.

FAQ

What is the minimum input voltage required for AP131-29WL-7 to maintain regulation at 300mA?

The minimum input voltage is 3.3V, calculated as VOUT + VDROP = 2.9V + 0.4V. Below this, output voltage sags proportionally; operation below 2.7V violates absolute maximum ratings and may cause undefined behavior or damage.

Can the BP pin be left unconnected, and what impact does that have?

Yes, the BP pin may be left floating or tied directly to OUT, but doing so forfeits the 0.1µF bypass benefit. Without the capacitor, PSRR degrades by ~15–20dB below 10kHz and low-frequency reference noise increases, potentially affecting ADC accuracy in precision analog designs.

Is AP131-29WL-7 compatible with ceramic output capacitors, and what value is recommended?

Yes, it is fully compatible with ceramic output capacitors. A minimum of 10µF X5R/X7R 0603 or larger is recommended; values between 10µF and 22µF provide optimal phase margin and transient response. Tantalum or aluminum electrolytic capacitors are not recommended due to ESR-related instability risks.

Does AP131-29WL-7 support reverse-voltage protection, and what happens if IN and OUT are swapped?

No, it lacks intrinsic reverse-voltage protection. Swapping IN and OUT forward-biases the internal parasitic diode, causing unregulated current flow from OUT to IN, rapid overheating, and potential permanent damage-even at low voltages. External reverse-polarity protection must be added if system-level reversal is possible.

AP131-29WL-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):: 2.9V

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

AP131-29WL-7 FAQ

1.How can I place an order for AP131-29WL-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP131-29WL-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 AP131-29WL-7 reliable?

The price and inventory of AP131-29WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP131-29WL-7 is usually 5 days.

3.What payment methods are accepted for AP131-29WL-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP131-29WL-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP131-29WL-7?

AP131-29WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP131-29WL-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 AP131-29WL-7?

For technical support, including AP131-29WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP131-29WL-7 requirements.

6.How does Aetrix verify that AP131-29WL-7 is sourced from the original manufacturer or authorized distributors?

All AP131-29WL-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 AP131-29WL-7 meets industry standards.

7.What is the process for return or replacement of AP131-29WL-7?

All AP131-29WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP131-29WL-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 AP131-29WL-7 part is unused and in its original packaging.

Return procedure for AP131-29WL-7:

1.Submit a request within 90 days.

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

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