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

Diodes Incorporated AP139-30WL-7

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

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Part No.:: AP139-30WL-7

Manufacturer:: Diodes Incorporated

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

Package:: SC-74A, SOT-753

Datasheet:: AP139-30WL-7.pdf

Description:: IC REG LDO 3V 0.3A SOT25

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Product details

Overview

AP139-30WL-7 from Diodes Incorporated is a 3.0V, 300mA low-noise CMOS LDO 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-power regulation.

For engineers reviewing the AP139-30WL-7 datasheet, AP139-30WL-7 pinout, AP139-30WL-7 application, or AP139-30WL-7 equivalent, key selection considerations include dropout performance at full load, bypass capacitor dependency for PSRR enhancement, EN pin logic polarity and leakage, thermal resistance (θJA = 226°C/W), and compatibility with 1.0μF low-ESR ceramic output capacitors.

Technical Context

The AP139 employs a pMOS pass transistor architecture with internal voltage reference and error amplifier feedback loop, enabling stable regulation across input voltages from 2.7V to 5.5V. Its enable circuitry pulls down the pass device when EN < 0.8V, reducing quiescent current to ≤3.0μA in shutdown mode.

PSRR is actively enhanced by the BYP pin: a 10nF capacitor between BYP and GND improves rejection to 75dB at 1kHz (vs. 60dB without), while maintaining stability with ≥1.0μF output capacitance-critical for noise-sensitive RF or ADC supply rails in compact handheld devices.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.0V ±2% at 1mA, ensuring precise biasing for 3.3V-tolerant I/O or low-voltage microcontrollers.
Max Output Current	Guaranteed 300mA continuous, supporting moderate-power peripherals like Bluetooth modules or sensor arrays.
Dropout Voltage	≤0.45V at 300mA (VOUT ≥ 2.8V), enabling operation down to VIN = 3.45V-critical for single-cell Li-ion or Li-poly systems.
Quiescent Current	45μA typ / 60μA max, minimizing standby drain in always-on battery applications such as wearables.
PSRR @ 1kHz	75dB with 10nF BYP cap, suppressing switching noise from DC-DC converters feeding the LDO input.
Thermal Shutdown	Activates at TJ = +130°C with +20°C hysteresis, protecting against sustained overload in sealed enclosures.
Input Voltage Range	2.7V to 5.5V, compatible with USB-powered, coin-cell, and multi-cell alkaline/battery sources.

Pinout & Package

SOT25 (5-pin, 2.9mm × 2.8mm × 1.3mm) 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; requires ≥0.1μF local decoupling to suppress high-frequency ripple.
GND	Analog/Digital Ground	Common return path for all internal circuits; must be low-impedance and adjacent to VIN/VOUT caps.
EN	Active-Low Enable	Pulled low (<0.8V) disables regulator; floats high or driven high (>1.7V) enables operation.
BYP	Noise Reduction Control	Connects to 10nF capacitor to ground to boost PSRR-essential for analog/RF supply filtering.
VOUT	Regulated Output	Delivers stable 3.0V; requires ≥1.0μF low-ESR ceramic capacitor directly at pin for stability.

Key Features

Feature	Design Value
Low Dropout Operation	Enables >90% efficiency at light loads and extends usable battery life in 3.0V-output systems.
Ultra-Low Quiescent Current	45μA typ allows multi-year operation on coin cells in IoT sensors or real-time clocks.
BYP Pin for PSRR Tuning	Configurable 10nF bypass capacitor raises PSRR by 15dB at 1kHz-key for clean ADC reference supplies.
Integrated Protection	Current limit (300–450mA) and thermal shutdown prevent damage during short-circuit or ambient overtemperature.
Stability with Low-ESR Caps	Works reliably with 1.0μF X5R/X7R ceramics-reducing BOM count vs. tantalum or electrolytic alternatives.

Applications

Wireless Headsets

Smart Wearables

Use Scenario: Compact Bluetooth audio earbuds requiring ultra-low standby power and noise-immune 3.0V rail for codec and RF front-end.

IC Role / Device Role / Timing Role: Primary LDO supplying regulated 3.0V to Bluetooth SoC and MEMS microphone bias circuitry.

Use Value: 45μA IQ minimizes battery drain during idle; 75dB PSRR with BYP cap suppresses 2.4GHz switching noise coupling into audio path.

Use Scenario: Fitness tracker with optical heart-rate sensor, accelerometer, and OLED display powered from single Li-poly cell.

IC Role / Device Role / Timing Role: Main system LDO delivering stable 3.0V to MCU, sensor interface, and display driver ICs.

Use Value: 0.45V dropout enables >3.5-hour runtime at full brightness down to 3.45V battery voltage; thermal shutdown prevents overheating in wrist-worn enclosure.

USB-C Peripheral Hubs

Industrial Handheld Scanners

Use Scenario: Multi-port USB hub with integrated PD controller and status LEDs, powered via 5V USB-C input.

IC Role / Device Role / Timing Role: Secondary LDO generating clean 3.0V for USB PHY termination resistors and LED driver logic.

Use Value: Input range up to 5.5V accommodates USB-C VBUS tolerance; low ESR stability avoids need for bulky input filtering.

Use Scenario: Rugged barcode scanner using CMOS image sensor and laser diode driver, operating in warehouse environments (-20°C to +60°C).

IC Role / Device Role / Timing Role: Local LDO providing 3.0V to microcontroller and sensor interface under intermittent high-current laser pulses.

Use Value: Guaranteed 300mA output supports peak pulse loads; -40°C to +85°C operating range ensures reliability across industrial temperature extremes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7343-30SG-7	Successor part: lower IQ (2.5μA typ), improved PSRR (80dB @1kHz), same SOT25 footprint.	Designed for next-gen ultra-low-power designs; pin-compatible but not drop-in due to different BYP behavior.	Select for new designs requiring longer battery life and higher noise immunity-requires validation of BYP capacitor value.
MCP1700-3002E/MB	Microchip part: 1.6μA IQ, 6V max input, but only 250mA rated output and no BYP pin.	Lacks PSRR tuning capability; suited for simpler, lower-current applications where noise sensitivity is minimal.	Choose when ultra-low IQ dominates over PSRR and full 300mA load capability is not required.

Compared with AP139-30WL-7, AP7343-30SG-7 offers superior standby efficiency and noise rejection but requires updated BYP design; MCP1700-3002E/MB trades off output current and PSRR flexibility for extreme quiescent savings in low-duty-cycle sensing nodes.

Availability

AP139-30WL-7 is available at Aetrix Electronics and suitable for wireless headsets, smart wearables, USB-C peripheral hubs, and industrial handheld scanners requiring stable component supply with known end-of-life status.

Supply support for AP139-30WL-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 product line, engineered specifically for space-constrained, battery-operated portable electronics demanding high accuracy, low dropout, and robust thermal protection.

FAQ

What is the minimum input voltage required for 3.0V output at 300mA load?

The AP139-30WL-7 requires VIN ≥ VOUT + VDROPOUT = 3.0V + 0.45V = 3.45V at 300mA. Below this, regulation fails and output drops linearly with input. The absolute minimum VIN is 2.7V, but usable regulation at full load begins at 3.45V per datasheet dropout specification.

Is the BYP pin mandatory for stable operation?

No-the BYP pin is optional and used solely to improve PSRR; the AP139-30WL-7 remains stable without it. However, omitting the 10nF BYP-to-GND capacitor reduces PSRR by ~15dB at 1kHz, which may compromise noise-sensitive analog circuits like ADC references or RF receivers.

Can AP139-30WL-7 be used in automotive applications?

No-AP139-30WL-7 is not AEC-Q100 qualified and is marked NRND (Not Recommended for New Designs). Diodes explicitly states that automotive-grade variants require separate qualification, PPAP capability, and IATF 16949 manufacturing-none of which apply to this SOT25 commercial-grade part.

What happens to output voltage during thermal shutdown?

During thermal shutdown (triggered at TJ ≥ +130°C), the AP139-30WL-7 forces VOUT low and disables the pass transistor. Output remains near 0V until junction temperature falls below +110°C (20°C hysteresis), at which point normal regulation resumes automatically without external intervention.

AP139-30WL-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Discontinued at Digi-Key

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

AP139-30WL-7 FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your AP139-30WL-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 AP139-30WL-7?

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

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

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

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

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

Return procedure for AP139-30WL-7:

1.Submit a request within 90 days.

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

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