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Diodes Incorporated AP139-20WL-7
- Part No.:
- AP139-20WL-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP139-20WL-7.pdf
- Description:
- IC REG LINEAR 2V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:5,872
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Product details
Overview
AP139-20WL-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 AP139-20WL-7 datasheet, AP139-20WL-7 pinout, AP139-20WL-7 application, or AP139-20WL-7 equivalent, key selection considerations include input voltage range (2.7–5.5V), bypass capacitor requirement (10nF between BYP and GND), stability with ≥1.0μF low-ESR output capacitor, EN pin logic behavior (active-low enable), and thermal shutdown threshold (+130°C).
Technical Context
The AP139-20WL-7 employs a pMOS pass transistor architecture with internal voltage reference and error amplifier feedback loop, enabling precise regulation across load (0–300mA) and line (2.7–5.5V) variations. Its low-quiescent-current design maintains regulation during standby while supporting fast transient response via bypass capacitor coupling.
Functional safety mechanisms include overcurrent limiting (300–450mA trip), thermal shutdown activation at +130°C with +20°C hysteresis, and EN-controlled power-down reducing IQ to <2.0μA. The device operates reliably from –40°C to +85°C ambient, with junction temperature limited to +125°C under recommended conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0V ±2% at 1mA, ensuring stable core voltage for 2.0V logic or analog circuitry |
| Max Output Current | 300mA guaranteed, sufficient for microcontrollers, sensors, or RF front-ends in portable devices |
| Dropout Voltage | ≤0.45V at 300mA, enabling operation down to VIN = 2.45V while maintaining regulation |
| Quiescent Current | 45μA typ / 60μA max, minimizing battery drain in always-on or sleep-mode applications |
| PSRR @ 1kHz | 75dB with 10nF BYP capacitor, suppressing input ripple for noise-sensitive analog/RF stages |
| Thermal Shutdown | Activates at TJ = +130°C with +20°C hysteresis, preventing permanent damage during overload or poor heatsinking |
| Input Voltage Range | 2.7V to 5.5V, compatible with single Li-ion, Li-polymer, or dual-AA/AAA battery inputs |
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 DC; requires ≥0.1μF ceramic decoupling close to pin |
| GND | Ground Reference | Common return path for all internal circuits and external capacitors |
| EN | Enable Control | Active-low logic input; pulls high internally; <0.1μA leakage when floating or driven |
| BYP | Bypass Capacitor Node | Connects to 10nF capacitor to GND to improve PSRR and noise rejection |
| VOUT | Regulated Output | Delivers stable 2.0V ±2%; requires ≥1.0μF low-ESR ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 75dB PSRR at 1kHz with 10nF BYP cap enables clean supply for ADCs, PLLs, and RF ICs |
| Ultra-low IQ operation | 45μA typical quiescent current extends battery life in IoT sensors and wearables |
| Robust protection suite | Integrated current limit (300–450mA) and thermal shutdown (+130°C) prevent field failures |
| Wide input compatibility | 2.7–5.5V input range supports single-cell Li-ion (3.0–4.2V) and alkaline battery stacks |
| Stable with low-ESR caps | Guaranteed stability with ≥1.0μF ceramic output capacitor simplifies layout and reduces BOM cost |
Applications
| Wearable Health Monitor | Bluetooth LE Peripheral |
|---|---|
Use Scenario: Continuous ECG/PPG sensing powered by coin-cell or thin-film battery. IC Role / Device Role / Timing Role: Primary 2.0V LDO supplying analog front-end and ultra-low-power MCU. Use Value: 45μA IQ minimizes standby drain; 0.45V dropout allows >20% longer runtime vs. legacy regulators at end-of-battery. | Use Scenario: Compact BLE beacon with sensor fusion and intermittent radio transmission. IC Role / Device Role / Timing Role: Stable 2.0V rail for BLE SoC I/O and internal regulators. Use Value: 75dB PSRR at 1kHz suppresses switching noise from RF PA, improving RX sensitivity by ≥2dB. |
| Smart Home Sensor Node | Industrial Handheld Scanner |
Use Scenario: Battery-operated temperature/humidity node transmitting via Zigbee or Thread. IC Role / Device Role / Timing Role: Main system regulator enabling deep-sleep wake-up cycles. Use Value: EN pin control reduces system IQ to <2μA in sleep mode, extending 2-year battery life target. | Use Scenario: Ruggedized barcode scanner using AA batteries and high-brightness LED illumination. IC Role / Device Role / Timing Role: Dedicated 2.0V supply for image sensor and interface logic. Use Value: Thermal shutdown + current limit protect against LED surge currents and connector short events. |
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 part: 200mA output, 25μA IQ, 0.22V dropout at 200mA, same SOT25 footprint | Lower IQ and dropout, but reduced current rating; not drop-in for 300mA loads | Select if system load ≤200mA and battery life is critical; verify thermal margin at full load |
| MCP1700-2002E/TO | 2.0V fixed, 250mA, 1.6μA IQ, TO-92 package; no EN or BYP pins | Through-hole only; lacks enable control and bypass optimization for noise-sensitive apps | Choose for cost-sensitive, non-portable industrial controls where PCB space and noise are secondary |
Compared with AP7343-20SAG-7 and MCP1700-2002E/TO, the AP139-20WL-7 uniquely balances 300mA drive capability, 45μA IQ, and BYP-enhanced PSRR-making it optimal for compact, battery-constrained designs needing both current headroom and noise immunity.
Availability
AP139-20WL-7 is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth LE peripherals, smart home sensor nodes, and industrial handheld scanners requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for AP139-20WL-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, with design, manufacturing, and distribution operations across Asia, the Americas, and Europe.
The AP139 belongs to Diodes' precision CMOS LDO family, engineered specifically for ultra-low-power, noise-critical battery-powered applications where small size, low dropout, and high accuracy are essential.
FAQ
What is the minimum input voltage required for AP139-20WL-7 to maintain 2.0V regulation at 300mA?
The minimum input voltage is calculated as VOUT + VDROPOUT = 2.0V + 0.45V = 2.45V. However, the datasheet specifies a recommended minimum VIN of 2.7V to ensure guaranteed regulation across temperature, process variation, and load transients. Below 2.7V, output may droop or become unregulated under worst-case conditions.
Can AP139-20WL-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 at 1kHz). Omitting it degrades high-frequency noise rejection by up to 35dB and may cause instability under certain load/transient conditions. The device remains functional but fails to meet its published noise-suppression specifications.
Is AP139-20WL-7 qualified for automotive applications?
No-AP139-20WL-7 is not AEC-Q100 qualified. Diodes explicitly states that automotive-grade versions require separate qualification (e.g., PPAP, IATF 16949 manufacturing), and this part is marked "Not Recommended for New Designs" (NRND) with EOL status indicated in ordering information. Automotive users must select designated AEC-Q100 LDOs such as the AP7361 series.
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. With no external connection, it draws <0.1μA leakage current and asserts active state. To disable the output, EN must be actively pulled below 0.8V (VEL threshold); open-circuit or high-impedance states result in enabled operation.
AP139-20WL-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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):
- 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
AP139-20WL-7 FAQ
1.How can I place an order for AP139-20WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP139-20WL-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 AP139-20WL-7 reliable?
The price and inventory of AP139-20WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP139-20WL-7 is usually 5 days.
3.What payment methods are accepted for AP139-20WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP139-20WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP139-20WL-7?
AP139-20WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP139-20WL-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 AP139-20WL-7?
For technical support, including AP139-20WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP139-20WL-7 requirements.
6.How does Aetrix verify that AP139-20WL-7 is sourced from the original manufacturer or authorized distributors?
All AP139-20WL-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 AP139-20WL-7 meets industry standards.
7.What is the process for return or replacement of AP139-20WL-7?
All AP139-20WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP139-20WL-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 AP139-20WL-7 part is unused and in its original packaging.
Return procedure for AP139-20WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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