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Diodes Incorporated AP139-20WG-7
- Part No.:
- AP139-20WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP139-20WG-7.pdf
- Description:
- IC REG LINEAR 2V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP139-20WG-7 from Diodes Incorporated is a 2.0V fixed-output, 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 AP139-20WG-7 datasheet, AP139-20WG-7 pinout, AP139-20WG-7 application, or AP139-20WG-7 equivalent, key selection criteria include dropout voltage at full load, PSRR performance at 1kHz–100kHz with 10nF bypass, EN pin threshold (1.7V high/0.8V low), stability with ≥1.0μF low-ESR output capacitor, and thermal resistance (θJA = 226°C/W) in SOT25.
Technical Context
The AP139-20WG-7 employs a pMOS pass transistor architecture with precision bandgap reference and error amplifier feedback, enabling ultra-low quiescent current operation while maintaining tight output regulation across input range (2.7V–5.5V) and load (0–300mA). Its enable logic directly gates internal bias circuits, reducing standby current to <2.0μA.
Stability is achieved via internal compensation optimized for low-ESR ceramic capacitors (≥1.0μF), with dedicated BYP pin accepting 10nF capacitor to enhance PSRR-reaching 75dB at 1kHz and 55dB at 10kHz when bypassed-critical for noise-sensitive analog and RF subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0V ±2% - ensures precise rail generation for 2.0V logic or analog circuitry without external resistors. |
| Max Output Current | 300mA guaranteed - supports moderate-power microcontrollers, sensors, or interface ICs in compact portable designs. |
| Dropout Voltage | ≤0.45V at 300mA - enables operation down to VIN = 2.45V, extending battery runtime in single-cell Li-ion or 3×AA applications. |
| Quiescent Current | 45μA typ / 60μA max - minimizes no-load battery drain, critical for always-on or infrequently active devices. |
| PSRR @ 1kHz | 75dB with 10nF BYP cap - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Thermal Shutdown | Activates at +130°C, hysteresis +20°C - protects against sustained overload or poor PCB thermal design without latch-up. |
| Enable Threshold | VEN(H) ≥1.7V, VEN(L) ≤0.8V - compatible with 1.8V/3.3V GPIOs for controlled power sequencing. |
Pinout & Package
SOT25 (5-pin, 2.9mm × 1.6mm × 1.1mm) surface-mount package with exposed pad for thermal enhancement; RoHS-compliant, halogen-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 2.7–5.5V; requires ≥0.1μF input capacitor close to pin for stability. |
| GND | Ground Reference | Common return path for all internal circuits and output capacitor; must connect to low-impedance ground plane. |
| EN | Enable Control Input | Active-high logic input; pulls low to disable regulator and reduce IQ to <2μA; floats high by default. |
| BYP | Bypass Capacitor Terminal | Connects to 10nF capacitor to ground to improve PSRR and high-frequency noise rejection. |
| VOUT | Regulated Output | Delivers stable 2.0V ±2% up to 300mA; requires ≥1.0μF low-ESR ceramic capacitor to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 75dB PSRR at 1kHz with 10nF BYP cap-enables clean power for ADCs, RF receivers, and precision analog stages. |
| Ultra-low IQ operation | 45μA typical quiescent current-extends shelf life and operational time in battery-critical IoT endpoints. |
| Robust protection suite | Integrated current limit (300–450mA) and thermal shutdown (+130°C)-eliminates need for external fault management circuitry. |
| Wide input compatibility | 2.7–5.5V input range-supports single-cell Li-ion (2.7–4.2V), 3×AA (3.0–4.5V), and 5V USB-supplied systems. |
| Small-footprint packaging | SOT25 footprint (2.9×1.6mm)-fits space-constrained wearable and handheld PCB layouts without thermal derating penalties. |
Applications
| Wearable Health Monitors | USB-Powered Peripherals |
|---|---|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn devices powered by rechargeable coin cell or polymer Li-ion. IC Role / Device Role / Timing Role: Primary 2.0V supply regulator for analog front-end and low-power MCU, enabling sub-100μA sleep mode. Use Value: 45μA IQ and 0.45V dropout preserve battery capacity over multi-day operation; 75dB PSRR prevents switching noise from corrupting microvolt-level biosignals. | Use Scenario: Compact USB-to-serial adapter or HID keyboard using 5V USB bus power. IC Role / Device Role / Timing Role: Local 2.0V rail generator for 2.0V-tolerant UART transceivers or low-voltage logic, decoupled from noisy USB VBUS. Use Value: Stability with 1.0μF ceramic output cap simplifies BOM; EN pin allows host-controlled power gating during USB suspend. |
| Smart Home Sensors | Industrial Handheld Scanners |
Use Scenario: Battery-operated temperature/humidity node transmitting via BLE or Sub-GHz radio. IC Role / Device Role / Timing Role: Main regulator for sensor signal chain and BLE SoC, activated only during measurement/transmit cycles. Use Value: <2μA shutdown current extends 2-year battery life; ±2% accuracy ensures consistent ADC reference and RF oscillator performance. | Use Scenario: Rugged barcode scanner with OLED display, imager, and motorized trigger, powered by removable Li-ion pack. IC Role / Device Role / Timing Role: Secondary 2.0V supply for display driver IC and image sensor interface, isolated from main 3.3V rail. Use Value: Thermal shutdown prevents failure during extended scanning under high ambient temperature; SOT25 footprint fits narrow bezel PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-20SAG-7 | Successor device: lower IQ (2.5μA typ), improved PSRR (80dB @1kHz), same SOT25 package and 2.0V output. | Designed for next-gen ultra-low-power designs where >10× IQ reduction justifies redesign effort. | Select if new design prioritizes multi-year battery life and higher noise immunity; not drop-in due to different EN polarity (active-low vs. AP139's active-high). |
| MCP1700T-2002E/TT | Microchip part: 2.0V fixed, 250mA, 1.6μA IQ, SOT23-5 package-smaller footprint but lower current rating and no BYP pin. | Used in space-limited, low-current applications where PSRR >60dB is not required. | Choose when board area is constrained and load never exceeds 250mA; verify thermal performance as θJA is higher than SOT25. |
Compared with AP139-20WG-7, AP7343-20SAG-7 delivers superior energy efficiency and noise rejection but requires firmware and layout updates for active-low EN control, whereas MCP1700T-2002E/TT saves PCB area at the cost of current capability and bypass-enhanced PSRR-making AP139-20WG-7 optimal for legacy-compatible 300mA, medium-noise-sensitivity designs.
Availability
AP139-20WG-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensors, and industrial handheld scanners requiring stable component supply with known lifecycle status.
Supply support for AP139-20WG-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 AP139 belongs to Diodes' low-noise CMOS LDO product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, high accuracy, and robust thermal protection in minimal footprint packages.
FAQ
What is the minimum input voltage required for AP139-20WG-7 to maintain 2.0V output at 300mA?
The minimum input voltage is calculated as VOUT + VDROPOUT = 2.0V + 0.45V = 2.45V. The datasheet specifies 2.7V as the absolute minimum recommended input voltage to ensure margin across temperature, process variation, and load transients-so 2.7V is the practical lower limit for reliable 300mA operation.
Can AP139-20WG-7 operate without the 10nF bypass capacitor on the BYP pin?
Yes, it will regulate, but PSRR degrades significantly: without the 10nF BYP capacitor, PSRR drops to 60dB at 1kHz (vs. 75dB with it) and falls further at higher frequencies. For noise-sensitive applications like precision ADCs or RF receivers, omitting the BYP cap risks increased output ripple and compromised signal integrity.
Is AP139-20WG-7 qualified for automotive applications?
No-AP139-20WG-7 is not AEC-Q100 qualified. Diodes explicitly states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for commercial/industrial portable electronics only. Use AP7361x or AP7362x series for automotive-qualified 2.0V LDOs.
How does the EN pin behave when left unconnected?
The EN pin has an internal pull-up, so it defaults to high when floating-enabling normal regulator operation. No external pull-up is required. However, in noisy environments, a weak external pull-up (e.g., 100kΩ to VIN) is recommended to prevent false disabling due to ESD or coupling.
AP139-20WG-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):
- 2V
- 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
AP139-20WG-7 FAQ
1.How can I place an order for AP139-20WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP139-20WG-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 AP139-20WG-7 reliable?
The price and inventory of AP139-20WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP139-20WG-7 is usually 5 days.
3.What payment methods are accepted for AP139-20WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP139-20WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP139-20WG-7?
AP139-20WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP139-20WG-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 AP139-20WG-7?
For technical support, including AP139-20WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP139-20WG-7 requirements.
6.How does Aetrix verify that AP139-20WG-7 is sourced from the original manufacturer or authorized distributors?
All AP139-20WG-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 AP139-20WG-7 meets industry standards.
7.What is the process for return or replacement of AP139-20WG-7?
All AP139-20WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP139-20WG-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 AP139-20WG-7 part is unused and in its original packaging.
Return procedure for AP139-20WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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