My Inquiry
My Account
Diodes Incorporated AP139-25WL-7
- Part No.:
- AP139-25WL-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP139-25WL-7.pdf
- Description:
- IC REG LINEAR 2.5V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:5,348
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP139-25WL-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 AP139-25WL-7 datasheet, AP139-25WL-7 pinout, AP139-25WL-7 application, or AP139-25WL-7 equivalent, key selection criteria include dropout performance at full load, bypass capacitor dependency for noise suppression, EN pin logic polarity and leakage, stability with 1.0μF low-ESR ceramic output capacitors, and thermal derating in SOT25 under ambient constraints.
Technical Context
The AP139 employs a p-channel MOSFET pass transistor controlled by an error amplifier referenced to a precision bandgap, enabling low dropout operation without external compensation. Its enable circuitry draws <0.1μA when inactive and transitions fully off below 0.8V (VEL), reducing standby current to ≤3.0μA.
Stability is achieved with ≥1.0μF ceramic output capacitance and requires a 10nF BYP-to-GND capacitor to suppress high-frequency noise and improve PSRR-especially critical above 1kHz where PSRR reaches 75dB at 1kHz (with 10nF BYP) but degrades to 30dB at 100kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V ±2% - tightly regulated rail for core logic or sensor analog supply |
| Max Output Current | 300mA - supports moderate-load microcontrollers or RF modules |
| Dropout Voltage | ≤0.45V at 300mA - enables operation down to VIN = 2.95V while maintaining regulation |
| Quiescent Current | 45μA typ - extends battery life in always-on monitoring circuits |
| PSRR @ 1kHz | 75dB with 10nF BYP cap - suppresses switching noise from upstream DC/DC converters |
| Thermal Shutdown | Activates at +130°C with +20°C hysteresis - prevents permanent damage during sustained overload |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, Li-poly, or 3.3V/5V system rails |
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; requires ≥0.1μF input decoupling close to pin |
| GND | Ground Reference | Common return for all internal circuits and output capacitor; must be low-impedance |
| EN | Enable Control Input | Active-high logic: >1.7V enables regulator; <0.8V disables with <3μA standby current |
| BYP | Bypass Capacitor Terminal | Connects to 10nF capacitor to GND to stabilize reference and improve PSRR above 1kHz |
| VOUT | Regulated Output | Delivers 2.5V ±2% at up to 300mA; stable with ≥1.0μF low-ESR ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Architecture | pMOS pass element enables sub-0.5V dropout at full 300mA load, minimizing input headroom |
| Ultra-Low Quiescent Current | 45μA typical ensures >1-year battery life in coin-cell–powered IoT sensors (e.g., 220mAh CR2032) |
| Integrated Protection | Current limit (300–450mA) and thermal shutdown (+130°C) prevent failure during short-circuit or enclosure overheating |
| No External Compensation | Stable with standard 1.0μF ceramic output capacitor-reduces BOM count and PCB area vs. bipolar LDOs |
| High PSRR with BYP Pin | 75dB @ 1kHz (10nF BYP) enables clean power delivery to noise-sensitive ADCs or RF transceivers |
Applications
| Wearable Health Monitor | USB-C Peripheral Hub |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by rechargeable Li-poly battery. IC Role / Device Role: Supplies ultra-low-noise 2.5V bias to 16-bit SAR ADC and analog front-end. Use Value: 75dB PSRR at 1kHz (with 10nF BYP) rejects USB-C VBUS ripple and digital switching noise, preserving SNR >85dB. |
Use Scenario: Compact multi-port USB hub with embedded USB-PD controller and level shifters. IC Role / Device Role: Provides stable 2.5V rail for USB PHY termination and PD communication logic. Use Value: 0.45V dropout allows operation from 3.3V auxiliary rail even under 300mA peak load, avoiding brownout during enumeration. |
| Smart Home Sensor Node | Industrial Handheld Scanner |
|
Use Scenario: Battery-operated Zigbee temperature/humidity node with 10-year shelf life target. IC Role / Device Role: Powers MCU and digital sensor interface in always-on listen mode. Use Value: 45μA quiescent current enables >10-year runtime on 2000mAh Li-SOCl₂ cell (typical sleep current <50μA). |
Use Scenario: Ruggedized barcode scanner with OLED display and laser driver. IC Role / Device Role: Regulates 2.5V for display controller and image processing ASIC. Use Value: Thermal shutdown (+130°C) and current limit protect against sustained short-circuit during drop testing or connector misinsertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-25SAG-7 | Successor device: 250mA rating, 25μA IQ, improved PSRR (80dB @ 1kHz), same SOT25 footprint | Designed for new designs; supports tighter load transient response and lower noise in next-gen wearables | Select for new projects requiring extended lifecycle support and enhanced noise immunity |
| MCP1700-2502E/TO | 300mA, 1.6μA IQ, but higher dropout (600mV @ 250mA); TO-92 through-hole package | Limited to low-density PCBs or legacy through-hole assembly; unsuitable for space-constrained handhelds | Consider only for cost-sensitive, non-portable industrial controls where board area is unconstrained |
Compared with AP139-25WL-7, AP7343-25SAG-7 offers lower quiescent current and better PSRR in identical packaging-ideal for longevity-critical designs-while MCP1700-2502E/TO trades size and noise performance for ultra-low IQ and through-hole compatibility in less demanding environments.
Availability
AP139-25WL-7 is available at Aetrix Electronics and suitable for battery-powered portable electronics, low-power sensor nodes, and USB peripheral power management requiring stable component supply and long-term obsolescence planning.
Supply support for AP139-25WL-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 family, engineered specifically for energy-constrained portable devices where battery life, thermal safety, and noise-sensitive analog performance are primary design drivers.
FAQ
What is the minimum input voltage required for AP139-25WL-7 to maintain 2.5V regulation at 300mA?
The minimum input voltage is calculated as VOUT + VDROPOUT = 2.5V + 0.45V = 2.95V. Below this, the device enters dropout and output voltage declines linearly with VIN. This value is confirmed in the Electrical Characteristics table under VDROPOUT test condition (IO = 1mA to 300mA, VOUT = VO(NOM) − 1.5%).
Can AP139-25WL-7 operate without the 10nF BYP capacitor?
No-the BYP capacitor is mandatory for stable operation and specified PSRR performance. Omitting it degrades high-frequency PSRR (e.g., drops from 75dB to ~50dB at 1kHz) and may cause oscillation under certain load conditions. The Functional Description section explicitly states "a 10nF capacitor is necessary to be placed in between Bypass and Ground."
Is AP139-25WL-7 qualified for automotive applications?
No-AP139-25WL-7 is not AEC-Q100 qualified. The datasheet notes that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; users must contact Diodes directly for such versions. This part is intended for commercial/industrial portable equipment only.
What is the thermal resistance (θJA) of AP139-25WL-7 in its SOT25 package?
The junction-to-ambient thermal resistance is 226°C/W under standard test conditions: FR-4 PCB, 1oz copper, single-sided, no heatsink or airflow. This value is measured per JEDEC JESD51-2 and appears in the Absolute Maximum Ratings table footnote 6. It defines safe power dissipation limits-e.g., 250mW max PD implies ~57°C rise above ambient at full load.
AP139-25WL-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
AP139-25WL-7 FAQ
1.How can I place an order for AP139-25WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP139-25WL-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 AP139-25WL-7 reliable?
The price and inventory of AP139-25WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP139-25WL-7 is usually 5 days.
3.What payment methods are accepted for AP139-25WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP139-25WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP139-25WL-7?
AP139-25WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP139-25WL-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 AP139-25WL-7?
For technical support, including AP139-25WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP139-25WL-7 requirements.
6.How does Aetrix verify that AP139-25WL-7 is sourced from the original manufacturer or authorized distributors?
All AP139-25WL-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 AP139-25WL-7 meets industry standards.
7.What is the process for return or replacement of AP139-25WL-7?
All AP139-25WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP139-25WL-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 AP139-25WL-7 part is unused and in its original packaging.
Return procedure for AP139-25WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP139-25WL-7 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
