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Diodes Incorporated AP139-25WG-7
- Part No.:
- AP139-25WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP139-25WG-7.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP139-25WG-7 from Diodes Incorporated is a 2.5V, 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-power biasing.
For engineers reviewing the AP139-25WG-7 datasheet, AP139-25WG-7 pinout, AP139-25WG-7 application, or AP139-25WG-7 equivalent, key selection criteria include dropout voltage under load, PSRR performance at 1kHz–100kHz with bypass capacitor, EN pin threshold (1.7V ON / 0.8V OFF), stability with ≥1.0μF low-ESR output cap, and thermal shutdown activation at +130°C.
Technical Context
The AP139-25WG-7 employs a pMOS pass transistor architecture with internal precision voltage reference and error amplifier feedback loop, enabling tight regulation across input range (2.7V–5.5V) and load (0–300mA). Its low-noise operation relies on external 10nF BYP-to-GND capacitor to suppress reference noise.
Enable control is active-high with <0.1μA leakage; pulling EN low disables the pass transistor and reduces quiescent current to ≤3μA. Protection logic integrates independent overcurrent detection (trip at 300–450mA) and thermal shutdown with +20°C hysteresis (activate at +130°C, recover at +110°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% at 1mA, ensuring stable core/bias rail for 2.5V logic or analog 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 = 2.95V 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 cap, rejecting low-frequency supply ripple in noise-sensitive analog stages |
| Thermal Shutdown | Activates at TJ = +130°C with +20°C hysteresis, preventing permanent damage during sustained overload |
| Input Voltage Range | 2.7V to 5.5V, compatible with single Li-ion, Li-poly, or 3.3V/5V system rails |
Pinout & Package
SOT25 (5-pin, lead-free, RoHS-compliant, "Green" halogen/antimony-free package; 2.9mm × 1.6mm footprint, 1.1mm height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary DC input (2.7–5.5V); requires ≥0.1μF local ceramic decoupling |
| GND | Ground Reference | Analog/digital common return; must be low-impedance and adjacent to BYP/VOUT |
| EN | Enable Control | Active-high logic input; <0.1μA leakage; pulls low to disable regulator and reduce IQ to ≤3μA |
| BYP | Reference Bypass | Connects 10nF capacitor to GND to filter internal reference noise and maximize PSRR |
| VOUT | Regulated Output | 2.5V ±2% output; stable with ≥1.0μF low-ESR ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Low-Noise Regulation | 75dB PSRR @ 1kHz with 10nF BYP cap enables clean power for ADCs, RF receivers, and precision op-amps |
| Ultra-Low Quiescent Current | 45μA typ ensures >1-year battery life in coin-cell–powered IoT sensors operating at 10μA average load |
| Robust Protection Suite | Integrated current limit (300–450mA trip) and thermal shutdown (+130°C / +20°C hysteresis) prevent field failure |
| Wide Input Compatibility | 2.7–5.5V input range supports direct connection to Li-ion (3.0–4.2V), USB (5V), or regulated 3.3V supplies |
| Small-Signal Stability | Stable with ≥1.0μF ceramic output cap (no ESR requirement), simplifying layout and reducing BOM count |
Applications
| Wearable Health Monitors | USB-C Peripheral Adapters |
|---|---|
Use Scenario: Continuous ECG/PPG sensing with ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Primary 2.5V bias rail for ADC reference and op-amp signal chain. Use Value: 45μA IQ extends CR2032 battery life beyond 18 months; 75dB PSRR prevents switching noise from corrupting sub-mV bio-signals. | Use Scenario: Compact USB-C to HDMI/SD card adapter with embedded controller and level shifters. IC Role / Device Role / Timing Role: Local 2.5V supply for USB transceiver PHY and interface logic. Use Value: 0.45V dropout allows reliable operation down to 2.95V input from stressed USB-C PD source; SOT25 footprint saves PCB area. |
| Smart Home Sensor Nodes | Industrial Handheld Scanners |
Use Scenario: Battery-operated Zigbee/Thread temperature/humidity node with wake-on-event operation. IC Role / Device Role / Timing Role: Always-on 2.5V rail for RTC, sensor interface, and RF SoC standby domain. Use Value: EN pin enables full system shutdown (IQ ≤3μA), achieving <1μA total system sleep current. | Use Scenario: Ruggedized barcode scanner powered by removable Li-ion pack (3.0–4.2V). IC Role / Device Role / Timing Role: Main 2.5V supply for image sensor interface and FPGA configuration logic. Use Value: Thermal shutdown protects against enclosure overheating during extended scanning; ±2% accuracy ensures consistent sensor calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-25SG-7 | Successor device: 250mA, 25μA IQ, 0.22V dropout @ 250mA, same SOT25 package | Lower dropout and IQ, but reduced current rating; not drop-in for 300mA loads | Select when battery life > output current capability is prioritized and load ≤250mA |
| MCP1700-2502E/TO | Microchip 2.5V LDO: 250mA, 1.6μA IQ, 6V max input, TO-92 package | Through-hole mounting, ultra-low IQ, but larger footprint and no EN/BYP pins | Select for legacy through-hole designs where minimal standby current outweighs surface-mount density needs |
Compared with AP139-25WG-7, AP7343-25SG-7 offers superior efficiency at light loads but sacrifices 50mA output headroom, while MCP1700-2502E/TO trades SMT compactness and feature set for extreme ultra-low-IQ operation in non-space-constrained assemblies.
Availability
AP139-25WG-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor nodes, USB-C peripheral adapters, and industrial handheld scanners requiring stable component supply with long-lifecycle support.
Supply support for AP139-25WG-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 ICs, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.
The AP139 belongs to Diodes' low-noise CMOS LDO product line, engineered specifically for battery-powered portable electronics where ultra-low quiescent current, small footprint, and robust protection are critical design requirements.
FAQ
What is the minimum input voltage required for AP139-25WG-7 to maintain 2.5V output at 300mA?
The minimum input voltage is calculated as VOUT + VDROPOUT = 2.5V + 0.45V = 2.95V. Below this, regulation fails and output drops linearly with input. This value is confirmed in the Electrical Characteristics table under VDROPOUT test condition (IO = 1mA to 300mA, VOUT ≥ 2.8V).
Can AP139-25WG-7 operate without the 10nF bypass capacitor on the BYP pin?
No - the 10nF capacitor between BYP and GND is mandatory for low-noise operation. Without it, PSRR degrades significantly (e.g., drops from 75dB to ~50dB at 1kHz), and output noise increases, compromising performance in analog/RF applications per Functional Description section.
Is AP139-25WG-7 qualified for automotive applications?
No - AP139-25WG-7 is not AEC-Q100 qualified. The datasheet explicitly states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is marked NRND (Not Recommended for New Designs) and intended for commercial/industrial use only.
How does the EN pin behave during power-up and shutdown sequences?
The EN pin floats high internally; no external pull-up is needed. When pulled low (<0.8V), the pMOS pass transistor turns off completely, disabling output and reducing quiescent current to ≤3μA. During power-up, EN must exceed 1.7V to enable regulation - this threshold ensures immunity to slow-rising or noisy supply rails.
AP139-25WG-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):
- 2.5V
- 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
AP139-25WG-7 FAQ
1.How can I place an order for AP139-25WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP139-25WG-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 AP139-25WG-7 reliable?
The price and inventory of AP139-25WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP139-25WG-7 is usually 5 days.
3.What payment methods are accepted for AP139-25WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP139-25WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP139-25WG-7?
AP139-25WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP139-25WG-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 AP139-25WG-7?
For technical support, including AP139-25WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP139-25WG-7 requirements.
6.How does Aetrix verify that AP139-25WG-7 is sourced from the original manufacturer or authorized distributors?
All AP139-25WG-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 AP139-25WG-7 meets industry standards.
7.What is the process for return or replacement of AP139-25WG-7?
All AP139-25WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP139-25WG-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 AP139-25WG-7 part is unused and in its original packaging.
Return procedure for AP139-25WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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