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

Diodes Incorporated AP139-15WG-7

Name: AP139-15WG-7
Brand: Diodes Incorporated
SKU: AP139-15WG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP139-15WG-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP139-15WG-7.pdf

Description:: IC REG LINEAR 1.5V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

AP139-15WG-7 from Diodes Incorporated is a 1.5V, 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-voltage bias.

For engineers reviewing the AP139-15WG-7 datasheet, AP139-15WG-7 pinout, AP139-15WG-7 application, or AP139-15WG-7 equivalent, key selection criteria include dropout voltage at full load, PSRR performance at 1kHz/10kHz with 10nF bypass, EN pin threshold (1.7V high-enable), and stability with ≥1.0μF low-ESR ceramic output capacitors.

Technical Context

The AP139 employs a p-channel MOSFET pass element controlled by an error amplifier referenced to a precision bandgap, enabling ultra-low dropout and minimal load-dependent regulation shift. Its internal architecture integrates overcurrent protection that limits output to 300–450mA and thermal shutdown triggered at +130°C with +20°C hysteresis.

Operation requires a 10nF capacitor between BYP and GND to suppress noise and enhance PSRR-achieving 75dB at 1kHz and 55dB at 10kHz-while maintaining stability with output capacitors as low as 1.0μF (ceramic, low ESR). The EN pin enables full system-level power gating with standby current <2.0μA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.5V ±2% at 1mA, ensuring precise bias for low-voltage logic or RF circuitry
Max Output Current	300mA guaranteed, supporting moderate-power microcontrollers or sensors without derating
Dropout Voltage	≤0.45V at 300mA, enabling operation down to VIN = 1.95V for 1.5V output
Quiescent Current	45μA typ (60μA max), minimizing battery drain in always-on wearable applications
PSRR @ 1kHz	75dB with 10nF BYP cap, critical for noise-sensitive analog/RF supply domains
EN Threshold	V_EH = 1.7V min, compatible with 1.8V/3.3V GPIO control without level-shifting
Thermal Shutdown	Activates at +130°C with +20°C hysteresis, preventing latch-up during transient overload

Pinout & Package

SOT25 (5-pin, 2.9mm × 1.6mm × 1.1mm) surface-mount package with exposed thermal pad (not electrically connected); RoHS-compliant, halogen-free "Green" construction.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Input Power Supply	Accepts 2.7–5.5V input; must be decoupled with ≥0.1μF ceramic capacitor near pin
GND	Ground Reference	Primary return path for load, regulator core, and BYP capacitor; requires low-impedance layout
EN	Enable Control	Active-high digital enable; floats high internally; pulls low (<0.8V) to disable regulator and reduce IQ to <2μA
BYP	Noise Filter Node	Connects to 10nF capacitor to GND to stabilize reference and boost PSRR above 1kHz
VOUT	Regulated Output	Delivers 1.5V ±2% to load; stable with ≥1.0μF ceramic output capacitor (low ESR)

Key Features

Feature	Design Value
Low Dropout Architecture	pMOS pass transistor enables sub-0.5V dropout at full 300mA load, extending battery runtime
Ultra-Low Quiescent Current	45μA typical ensures >1-year shelf life in coin-cell–powered IoT endpoints
Bypass-Enhanced PSRR	75dB @1kHz with 10nF BYP cap suppresses switching noise from upstream DC/DC converters
Integrated Protection	Current limit (300–450mA) and thermal shutdown (+130°C) prevent damage during fault conditions
Wide Input Range	2.7–5.5V operation supports single-cell Li-ion, 2×AA, or USB-powered systems

Applications

Wearable Health Monitors

Bluetooth LE Peripherals

Use Scenario: Continuous ECG/PPG sensing in wrist-worn devices powered by CR2032 or rechargeable Li-ion cells.

IC Role / Device Role / Timing Role: Provides clean, low-noise 1.5V bias to analog front-end amplifiers and ADC reference circuits.

Use Value: 45μA IQ extends battery life beyond 6 months; 75dB PSRR prevents RF switching noise from corrupting biometric signals.

Use Scenario: Compact BLE audio transmitters (e.g., headphone dongles) operating from 3.3V USB or 3.7V battery.

IC Role / Device Role / Timing Role: Supplies regulated 1.5V to BLE SoC I/O banks and crystal oscillator circuitry.

Use Value: 0.45V dropout allows operation down to 1.95V input, preserving usable battery range; EN pin enables host-controlled sleep mode.

Smart Home Sensors

Industrial Handheld Scanners

Use Scenario: Battery-operated temperature/humidity nodes transmitting via Zigbee or Thread mesh networks.

IC Role / Device Role / Timing Role: Powers MCU core, RF transceiver, and precision sensor interface at fixed 1.5V.

Use Value: ±2% output accuracy ensures consistent ADC reference across temperature; thermal shutdown protects against enclosure overheating.

Use Scenario: Ruggedized barcode scanners using 2×AA alkaline batteries (2.4–3.2V range) with intermittent high-current laser activation.

IC Role / Device Role / Timing Role: Delivers stable 1.5V to image sensor and decode ASIC during burst operation.

Use Value: 300mA current capability supports peak laser driver loads; low-tempco (50ppm/°C) maintains voltage stability across -20°C to +70°C operating range.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7343-15SAG-7	Successor device: 40μA IQ, 0.35V dropout @300mA, same SOT25 package, AEC-Q200 qualified option available	Designed for new designs; supports automotive-grade reliability and extended temp range (-40°C to +125°C)	Select for production ramp or automotive-qualified requirements; pin-compatible drop-in replacement
MCP1700T-1502E/TT	Microchip part: 1.8μA IQ, 600mA output, but higher 0.6V dropout @300mA and no BYP pin for PSRR enhancement	Better for ultra-low-power sleep modes; less suitable for noise-sensitive analog rails due to lower PSRR	Prefer when standby current is primary constraint and PSRR >60dB not required

Compared with AP139-15WG-7, AP7343-15SAG-7 improves dropout and qualification scope while retaining footprint compatibility, whereas MCP1700T-1502E/TT trades PSRR and dropout for extreme quiescent current-making it viable only where noise immunity is secondary to multi-year battery life.

Availability

AP139-15WG-7 is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE peripherals, smart home sensors, and industrial handheld scanners requiring stable component supply under constrained space and low-power budgets.

Supply support for AP139-15WG-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 power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP139 belongs to Diodes' low-noise CMOS LDO family, engineered specifically for battery-powered portable electronics where ultra-low IQ, tight output tolerance, and high PSRR are essential for analog/RF subsystem reliability.

FAQ

What is the minimum input voltage required for AP139-15WG-7 to maintain 1.5V output at 300mA?

The minimum input voltage is calculated as V_OUT + V_DROPOUT = 1.5V + 0.45V = 1.95V. However, the device's absolute minimum specified input is 2.7V per Recommended Operating Conditions. Operation below 2.7V is not guaranteed-designs must ensure VIN ≥2.7V even under battery discharge to maintain regulation and protection functionality.

Can AP139-15WG-7 operate without the 10nF bypass capacitor on the BYP pin?

No-the 10nF capacitor between BYP and GND is mandatory for achieving specified PSRR performance (75dB @1kHz) and reference stability. Omitting it degrades high-frequency noise rejection and may cause output ripple or oscillation under dynamic load, especially when paired with switching regulators upstream.

Is AP139-15WG-7 suitable for automotive applications?

AP139-15WG-7 is not AEC-Q200 qualified and is marked NRND (Not Recommended for New Designs). For automotive use, Diodes recommends the AP7343 series, which offers AEC-Q200 variants, extended temperature range (-40°C to +125°C), and enhanced reliability testing-AP139 should only be used in legacy automotive designs with formal waiver approval.

How does the EN pin behave when left unconnected?

The EN pin has an internal pull-up and floats high by default, enabling normal regulator operation. No external pull-up is required. When pulled below 0.8V (V_EL), the device shuts down completely, reducing quiescent current to <2.0μA and disconnecting VOUT from VIN-ideal for host-controlled power sequencing in multi-rail systems.

AP139-15WG-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):: 1.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

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

AP139-15WG-7 FAQ

1.How can I place an order for AP139-15WG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP139-15WG-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 AP139-15WG-7 reliable?

The price and inventory of AP139-15WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP139-15WG-7 is usually 5 days.

3.What payment methods are accepted for AP139-15WG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP139-15WG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP139-15WG-7?

AP139-15WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP139-15WG-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 AP139-15WG-7?

For technical support, including AP139-15WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP139-15WG-7 requirements.

6.How does Aetrix verify that AP139-15WG-7 is sourced from the original manufacturer or authorized distributors?

All AP139-15WG-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 AP139-15WG-7 meets industry standards.

7.What is the process for return or replacement of AP139-15WG-7?

All AP139-15WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP139-15WG-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 AP139-15WG-7 part is unused and in its original packaging.

Return procedure for AP139-15WG-7:

1.Submit a request within 90 days.

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

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