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

Diodes Incorporated AP139-30WG-7

Name: AP139-30WG-7
Brand: Diodes Incorporated
SKU: AP139-30WG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP139-30WG-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP139-30WG-7.pdf

Description:: IC REG LINEAR 3V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Inventory:3,402

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Product details

Overview

AP139-30WG-7 from Diodes Incorporated is a 3.0V, 300mA low-noise CMOS LDO regulator in SOT25 package, featuring 45μA typical quiescent current, 0.45V max dropout at 300mA, ±2% output voltage accuracy, and integrated thermal shutdown/current limiting-designed for battery-powered portable electronics requiring stable low-power biasing.

For engineers reviewing the AP139-30WG-7 datasheet, AP139-30WG-7 pinout, AP139-30WG-7 application, or AP139-30WG-7 equivalent, key selection considerations include dropout performance at 300mA load, bypass capacitor dependency (10nF required between BYP and GND), EN pin logic behavior (active-low enable), stability with ≥1.0μF low-ESR output capacitors, and its NRND status versus AP7343 migration path.

Technical Context

The AP139 employs a pMOS pass transistor architecture with internal voltage reference and error amplifier feedback loop, enabling precise regulation across input voltages from 2.7V to 5.5V. Its low 45μA quiescent current and 0.45V dropout at full 300mA load support extended battery life in always-on subsystems.

Enable functionality disables the pass transistor and powers down internal circuitry, reducing standby current to <2.0μA. The BYP pin requires a 10nF capacitor to ground to suppress noise and improve PSRR-especially critical above 1kHz where PSRR reaches 75dB at 1kHz (with 10nF bypass) but degrades to 30dB at 100kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.0V ±2% at 1mA–300mA load; enables direct replacement of 3.0V rail without external resistors.
Max Output Current	Guaranteed 300mA continuous; current limit activates at 300–450mA to prevent damage during overload.
Dropout Voltage	≤0.45V at 300mA (VOUT = 3.0V); allows operation down to VIN = 3.45V while maintaining regulation.
Quiescent Current	45μA typ / 60μA max; minimizes battery drain in sleep modes of handheld devices.
PSRR @ 1kHz	75dB with 10nF BYP capacitor; suppresses switching noise from upstream DC/DC converters.
Thermal Shutdown	Activates at TJ ≥ +130°C with +20°C hysteresis; protects against sustained overloads or poor PCB thermal design.
Input Voltage Range	2.7V to 5.5V; compatible with single Li-ion (3.0–4.2V), dual AA/AAA (3.0–3.6V), and USB-powered systems.

Pinout & Package

SOT25 (5-pin, lead-free, RoHS-compliant, halogen- and antimony-free "Green" package) with 1.6mm × 2.9mm footprint and 1.1mm height-optimized for space-constrained portable designs.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Input Power Supply	Accepts 2.7–5.5V; requires ≥0.1μF ceramic decoupling capacitor close to pin.
GND	Ground Reference	Common return for all internal circuits; must connect to low-impedance PCB ground plane.
EN	Enable Control Input	Active-low logic: <0.8V disables regulator (I_Q < 2μA); >1.7V enables operation.
BYP	Noise Reduction Node	Connects to 10nF capacitor to GND; essential for achieving specified PSRR and low-noise performance.
VOUT	Regulated Output	Delivers stable 3.0V ±2%; requires ≥1.0μF low-ESR ceramic capacitor to GND for stability.

Key Features

Feature	Design Value
Low Dropout Operation	0.45V max at 300mA enables use with weak or depleted batteries without rail collapse.
Ultra-Low Quiescent Current	45μA typ ensures >1-year shelf life in coin-cell–powered IoT sensors with periodic wake-up.
Integrated Protection	Thermal shutdown (+130°C trigger) and current limiting (300–450mA) eliminate need for external fault management circuitry.
Bypass-Enhanced PSRR	75dB PSRR at 1kHz with 10nF BYP capacitor enables clean power for RF or ADC subsystems sharing noisy rails.
Stability with Low-ESR Caps	Operates stably with ≥1.0μF ceramic output capacitors-reducing BOM count vs. electrolytic/tantalum alternatives.

Applications

Wearable Health Monitors

USB-Powered Peripherals

Use Scenario: Continuous ECG/PPG sensing in wrist-worn devices powered by rechargeable Li-poly cells (3.0–4.2V).

IC Role / Device Role / Timing Role: Primary 3.0V bias supply for analog front-end and ultra-low-power MCU core.

Use Value: 45μA quiescent current extends battery runtime between charges; 0.45V dropout maintains regulation as cell voltage drops to 3.45V.

Use Scenario: Bus-powered USB audio interface with DAC, op-amps, and microcontroller.

IC Role / Device Role / Timing Role: Clean 3.0V rail for precision audio conversion circuitry isolated from noisy USB 5V supply.

Use Value: 75dB PSRR at 1kHz (with 10nF BYP) suppresses USB switcher ripple, reducing audible noise floor by >20dB.

Smart Home Sensors

Industrial Handheld Terminals

Use Scenario: Battery-operated Zigbee/Thread temperature/humidity node using CR2032 or AA cells.

IC Role / Device Role / Timing Role: Regulated 3.0V source for RF transceiver and sensor interface ICs during transmit bursts.

Use Value: Guaranteed 300mA output supports peak RF current demands; thermal shutdown prevents failure during enclosure overheating.

Use Scenario: Ruggedized barcode scanner with OLED display, imager, and Bluetooth LE module.

IC Role / Device Role / Timing Role: Main 3.0V system rail enabling simultaneous operation of display driver, image processor, and BLE SoC.

Use Value: SOT25 package fits tight board space; ±2% output accuracy ensures reliable logic-level compatibility across mixed-voltage ICs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7343-30SAG-7	Successor device: 300mA, 40μA IQ, 0.35V dropout, same SOT25 package, AEC-Q200 qualified option available.	Supports automotive-grade reliability requirements; improved thermal performance (θ_JA = 200°C/W vs. 226°C/W).	Select for new designs requiring longer product lifecycle, higher reliability, or automotive qualification pathways.
MCP1700-3002E/TO	300mA, 1.6μA IQ (ultra-low), 6V max input, TO-92 package; no BYP pin or PSRR optimization.	Limited to low-noise-sensitive applications; lacks bypass-enhanced PSRR and thermal shutdown hysteresis.	Choose only when extreme quiescent current (<2μA) dominates over noise/thermal robustness in simple sensor nodes.

Compared with AP139-30WG-7, AP7343-30SAG-7 offers lower dropout and better thermal metrics for next-gen portable designs, while MCP1700-3002E/TO trades off noise immunity and protection features for ultra-low IQ in cost-sensitive, non-critical applications.

Availability

AP139-30WG-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensors, and industrial handheld terminals requiring stable component supply under constrained PCB area and battery-life targets.

Supply support for AP139-30WG-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, consumer, and computing markets.

The AP139 belongs to Diodes' low-noise LDO family, engineered specifically for battery-powered portable electronics where quiescent current, dropout voltage, and noise rejection directly impact runtime and signal fidelity.

FAQ

What is the minimum input voltage required for AP139-30WG-7 to maintain 3.0V output at 300mA?

The minimum input voltage is calculated as V_OUT + V_DROPOUT = 3.0V + 0.45V = 3.45V. This value is guaranteed per datasheet Section 6 (Electrical Characteristics), where dropout voltage is specified ≤0.45V at I_OUT = 300mA and V_OUT ≥ 2.8V. Below 3.45V, regulation fails and output drops linearly with input.

Is the BYP pin mandatory, and what happens if it's left unconnected?

Yes-the BYP pin must be connected to a 10nF capacitor to ground to achieve specified PSRR and low-noise performance. If left floating or unconnected, PSRR degrades significantly (e.g., drops from 75dB to ~40dB at 1kHz), and output noise increases, potentially disrupting sensitive analog or RF circuits powered by this LDO.

Does AP139-30WG-7 support reverse polarity or reverse current protection?

No-AP139-30WG-7 provides no built-in reverse polarity or reverse current protection. It lacks body-diode blocking or dedicated protection circuitry. External components (e.g., series Schottky diode or ideal diode controller) are required if input reversal or backfeed from VOUT to VIN is possible in the system.

Why is AP139-30WG-7 marked "Not Recommended for New Designs" (NRND)?

Diodes has designated AP139-30WG-7 as NRND because the AP7343 series offers superior specifications-including lower quiescent current (40μA vs. 45μA), lower dropout (0.35V vs. 0.45V), and enhanced thermal performance-while maintaining pin-to-pin compatibility and SOT25 packaging. Migration to AP7343-30SAG-7 is advised for all new designs.

AP139-30WG-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):: 3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.45V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: -

PSRR:: 75dB ~ 30dB (1KHz ~ 100KHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Short Circuit

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-25

AP139-30WG-7 FAQ

1.How can I place an order for AP139-30WG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP139-30WG-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 AP139-30WG-7 reliable?

The price and inventory of AP139-30WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP139-30WG-7 is usually 5 days.

3.What payment methods are accepted for AP139-30WG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP139-30WG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP139-30WG-7?

AP139-30WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP139-30WG-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 AP139-30WG-7?

For technical support, including AP139-30WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP139-30WG-7 requirements.

6.How does Aetrix verify that AP139-30WG-7 is sourced from the original manufacturer or authorized distributors?

All AP139-30WG-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 AP139-30WG-7 meets industry standards.

7.What is the process for return or replacement of AP139-30WG-7?

All AP139-30WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP139-30WG-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 AP139-30WG-7 part is unused and in its original packaging.

Return procedure for AP139-30WG-7:

1.Submit a request within 90 days.

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

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