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

Diodes Incorporated AP139-15WL-7

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

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Part No.:: AP139-15WL-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP139-15WL-7.pdf

Description:: IC REG LINEAR 1.5V 300MA SOT25

Quantity:: RFQ Add To RFQ list

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Inventory:3,387

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Product details

Overview

AP139-15WL-7 from Diodes Incorporated is a 1.5V, 300mA CMOS low-dropout linear 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-noise supply.

For engineers reviewing the AP139-15WL-7 datasheet, AP139-15WL-7 pinout, AP139-15WL-7 application, or AP139-15WL-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 thermal shutdown threshold (+130°C).

Technical Context

The AP139-15WL-7 employs a pMOS pass transistor architecture with internal voltage reference and error amplifier feedback loop to regulate output. Its enable circuitry powers down internal bias networks when EN is pulled low, reducing quiescent current to <2.0μA in shutdown mode.

It operates across 2.7V–5.5V input range and maintains regulation down to V_OUT + V_DROPOUT, where dropout is ≤0.45V at full 300mA load for V_OUT ≥ 2.8V. PSRR reaches 75dB at 1kHz with 10nF BYP capacitor, confirming its suitability for noise-sensitive analog/RF subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.5V ±2% at 1mA, enabling precise low-voltage core supply for microcontrollers or sensors
Max Output Current	Guaranteed 300mA continuous, supporting moderate-power peripherals without external boost stages
Dropout Voltage	≤0.45V at 300mA (for VOUT ≥ 2.8V); for 1.5V version, measured dropout is ~0.32V at 300mA per typical curves
Quiescent Current	45μA typ / 60μA max, minimizing battery drain in always-on wearable or IoT edge nodes
PSRR @ 1kHz	75dB with 10nF BYP capacitor, suppressing ripple from noisy switching supplies upstream
Thermal Shutdown	Activates at +130°C junction temperature with +20°C hysteresis, preventing permanent damage during sustained overload
Stability	Guaranteed with ≥1.0μF ceramic output capacitor (low ESR), simplifying layout in space-constrained SOT25 designs

Pinout & Package

SOT25 (5-pin) surface-mount package with exposed pad for thermal dissipation; footprint matches JEDEC MO-178AA standard, θ_JA = 226°C/W on 1oz FR-4 board.

Pin/Terminal	Circuit Role	Design Meaning
VIN	Input power supply	Accepts 2.7V–5.5V; must be decoupled with ≥0.1μF capacitor near pin
GND	Analog/digital ground reference	Common return path for all internal circuits; requires low-impedance connection to PCB ground plane
EN	Enable control input	Active-low logic: pull ≤0.8V to disable regulator and reduce IQ to <2μA
BYP	Bypass capacitor terminal	Connects to 10nF capacitor to GND to improve PSRR and high-frequency stability
VOUT	Regulated output	Delivers fixed 1.5V ±2%; requires ≥1.0μF low-ESR ceramic capacitor to GND for stability

Key Features

Feature	Design Value
Low-noise regulation	75dB PSRR at 1kHz with 10nF BYP cap enables clean supply for ADCs, RF ICs, and precision analog circuits
Ultra-low IQ operation	45μA typical quiescent current extends battery life in always-on sensor nodes and wearables
Robust protection suite	Integrated current limit (300–450mA) and thermal shutdown (+130°C) prevent failure under fault conditions
Wide input compatibility	2.7V–5.5V input range supports single-cell Li-ion, Li-poly, or dual-cell alkaline battery inputs
Small-footprint packaging	SOT25 (2.9mm × 1.6mm) enables compact designs in handheld and portable medical devices

Applications

Wearable Health Monitors

USB-Powered Peripherals

Use Scenario: Continuous ECG/PPG sensing in wrist-worn devices powered by coin-cell or small Li-poly battery.

IC Role / Device Role / Timing Role: Primary 1.5V LDO supplying ultra-low-power MCU and analog front-end.

Use Value: 45μA IQ minimizes standby drain; 0.32V dropout preserves runtime as battery discharges below 2.0V.

Use Scenario: Bus-powered USB audio interface or HID device with mixed 1.5V logic and 3.3V I/O rails.

IC Role / Device Role / Timing Role: Secondary 1.5V regulator for low-voltage logic cores or clock buffers downstream of main 5V USB rail.

Use Value: 75dB PSRR at 1kHz suppresses USB switcher noise, preventing audible artifacts or timing jitter.

Industrial Sensor Nodes

Smart Home Controllers

Use Scenario: Battery-operated wireless temperature/humidity node deployed in HVAC ducts or remote locations.

IC Role / Device Role / Timing Role: Stable 1.5V source for sub-GHz RF transceiver and ultra-low-power MCU sleep/wake cycles.

Use Value: EN pin allows MCU to gate power to peripheral sensors, achieving <2μA system shutdown current.

Use Scenario: Compact Wi-Fi/BLE hub integrating multiple low-voltage ICs (e.g., touch controllers, LED drivers) in wall-mounted enclosure.

IC Role / Device Role / Timing Role: Local 1.5V regulator for ASIC or FPGA I/O banks requiring tight voltage tolerance.

Use Value: ±2% output accuracy ensures reliable logic-level compatibility across temperature (-40°C to +85°C ambient).

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7343-15SAG-7	Successor part: lower IQ (2.5μA typ), improved PSRR (80dB @1kHz), same SOT25 package and 1.5V output	Designed for next-gen ultra-low-power designs; pin-compatible drop-in replacement with enhanced specs	Select for new designs requiring extended battery life and higher noise immunity
MCP1700T-1502E/TT	Microchip part: 1.5V, 250mA, 1.6μA IQ, SOT23-5 package; no BYP pin, lower PSRR (60dB @1kHz)	Lacks bypass capacitor option; suited for cost-sensitive, non-noise-critical applications	Choose only if BYP-enhanced PSRR is unnecessary and 250mA output suffices

Compared with AP139-15WL-7, AP7343-15SAG-7 delivers 18× lower quiescent current and +5dB PSRR while maintaining pinout and thermal characteristics; MCP1700T-1502E/TT trades noise performance and current capability for ultra-low IQ and lower cost in less demanding environments.

Availability

AP139-15WL-7 is available at Aetrix Electronics and suitable for battery-powered wearables, industrial sensor nodes, USB peripherals, and smart home controllers requiring stable component supply with known end-of-life status.

Supply support for AP139-15WL-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 AP139 belongs to Diodes' precision CMOS LDO family, engineered for ultra-low-noise, low-IQ regulation in space-constrained portable and battery-operated systems-prioritizing efficiency, stability, and robustness over cost-driven general-purpose use.

FAQ

What is the minimum input voltage required for AP139-15WL-7 to maintain regulation at 300mA load?

The minimum input voltage is determined by V_OUT + V_DROPOUT. For the 1.5V version, typical dropout at 300mA is ~0.32V (per DS31078 Fig. 1), so VIN(MIN) ≈ 1.82V. Absolute minimum VIN per datasheet is 2.7V - this ensures guaranteed 300mA output across temperature and process variation, not just typical conditions.

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 GND to achieve specified PSRR (75dB @1kHz). Leaving it open degrades high-frequency noise rejection significantly: PSRR drops to ~50dB at 1kHz and worsens above 10kHz, risking instability or noise coupling into sensitive analog loads.

Does AP139-15WL-7 support reverse polarity or reverse current protection?

No - the AP139-15WL-7 lacks intrinsic reverse-voltage or reverse-current protection. If VIN falls below VOUT (e.g., during power-down), current can flow backward from VOUT to VIN through the pMOS body diode. External protection (e.g., series Schottky diode or ideal diode controller) is required in systems prone to back-driving.

Why is AP139-15WL-7 marked "Not Recommended for New Designs"?

Diodes has designated AP139-15WL-7 as NRND (Not Recommended for New Designs) because the AP7343-15SAG-7 offers superior specifications - including 2.5μA IQ (vs. 45μA), 80dB PSRR (vs. 75dB), and tighter load regulation - in the same SOT25 package. It is functionally and pin-compatible, making migration straightforward for new projects.

AP139-15WL-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

AP139-15WL-7 FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your AP139-15WL-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 AP139-15WL-7?

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

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

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

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

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

Return procedure for AP139-15WL-7:

1.Submit a request within 90 days.

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

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