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Diodes Incorporated AP139-33WL-7
- Part No.:
- AP139-33WL-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP139-33WL-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,425
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Product details
Overview
AP139-33WL-7 from Diodes Incorporated is a 3.3V, 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 AP139-33WL-7 datasheet, AP139-33WL-7 pinout, AP139-33WL-7 application, or AP139-33WL-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 shutdown activation at +130°C.
Technical Context
The AP139-33WL-7 employs a pMOS pass transistor architecture with internal voltage reference and error amplifier feedback loop, enabling precise regulation across input voltages from 2.7V to 5.5V. Its enable logic is active-high, with sub-2μA standby current when EN is pulled low.
It operates in voltage-mode regulation under normal load and transitions to current-mode limiting above 300mA, with overtemperature protection triggering at +130°C and hysteresis of +20°C. Stability is ensured with ≥1.0μF ceramic output capacitor and mandatory 10nF BYP-to-GND capacitor for noise suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% at 1mA, ensuring compatibility with 3.3V logic and I/O domains. |
| Max Output Current | Guaranteed 300mA continuous, supporting microcontrollers, sensors, and RF modules in portable systems. |
| Dropout Voltage | ≤0.45V at 300mA, enabling operation down to VIN = 3.75V 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 ripple from noisy DC-DC stages feeding the LDO. |
| Thermal Shutdown | Activates at TJ = +130°C with +20°C hysteresis, preventing permanent damage during sustained overload or poor PCB thermal design. |
| Enable Threshold | VEN(H) ≥ 1.7V enables regulation; VEN(L) ≤ 0.8V disables output and reduces IQ to <2μA. |
Pinout & Package
SOT25 (5-pin, lead-free, RoHS-compliant, "Green" halogen/antimony-free) surface-mount package with 2.9mm × 1.6mm footprint and 1.1mm height. Thermal resistance θJA = 226°C/W on standard FR-4 board.
| 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 | Analog/digital ground reference | Common return path for all internal circuits; must connect to low-impedance PCB ground plane. |
| EN | Active-high enable control | Pulled high internally; driven low to disable regulator and reduce IQ to <2μA. |
| BYP | Noise reduction bypass node | Connects to 10nF capacitor to GND to improve PSRR and suppress high-frequency noise. |
| VOUT | Regulated output | Delivers stable 3.3V ±2%; requires ≥1.0μF low-ESR ceramic capacitor directly at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 75dB PSRR at 1kHz with 10nF BYP cap-critical for powering ADCs, PLLs, and RF receivers. |
| Ultra-low quiescent current | 45μA typ enables >1-year battery life in coin-cell–powered IoT sensors at 10μA average system load. |
| Robust protection suite | Integrated current limit (300–450mA) and thermal shutdown (+130°C) prevent field failures without external circuitry. |
| Wide input voltage range | 2.7–5.5V operation supports single Li-ion, dual alkaline, or USB-powered designs without pre-regulation. |
| Stability with low-ESR caps | Works reliably with 1.0μF ceramic output capacitors-reducing BOM cost and PCB area vs. tantalum alternatives. |
Applications
| Wearable Health Monitor | USB-C Peripheral Hub |
|---|---|
Use Scenario: Compact wrist-worn device with optical heart-rate sensor, BLE SoC, and OLED display powered from CR2032 or rechargeable LiPo. IC Role / Device Role / Timing Role: Primary 3.3V bias rail regulator for analog front-end and digital core, enabling low-power sleep mode via EN control. Use Value: 45μA IQ extends battery runtime; 0.45V dropout allows operation until battery drops to 3.75V; thermal shutdown prevents overheating during charging cycles. | Use Scenario: Multi-port USB-C hub with PD negotiation, HDMI, and USB 3.0, where clean 3.3V rails power USB transceivers and level shifters. IC Role / Device Role / Timing Role: Post-regulator after buck converter, filtering switching noise before sensitive high-speed interface ICs. Use Value: 75dB PSRR at 1kHz with 10nF BYP suppresses DC-DC ripple; ±2% accuracy ensures USB compliance margin for VBUS-sensing logic. |
| Smart Home Sensor Node | Industrial Handheld Scanner |
Use Scenario: Battery-operated Zigbee/Z-Wave temperature/humidity sensor deployed in HVAC ducts or wall cavities. IC Role / Device Role / Timing Role: Main system regulator supplying MCU, radio, and precision analog sensor signal chain. Use Value: Low temperature coefficient (50ppm/°C) maintains output stability across -40°C to +85°C ambient; SOT25 footprint saves space on dense 2-layer PCB. | Use Scenario: Rugged handheld barcode scanner with laser diode driver, imager, and Bluetooth LE, powered by 3.7V Li-ion pack. IC Role / Device Role / Timing Role: Isolated 3.3V rail for microcontroller and communication interfaces, decoupled from noisy motor/driver sections. Use Value: Current limiting protects against shorted data lines; thermal shutdown prevents failure during extended scanning in hot environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343-33WG-7 | Successor part: lower IQ (2.5μA typ), improved PSRR (80dB @1kHz), same SOT25 package and 3.3V output. | Designed for ultra-low-power IoT edge nodes where multi-year battery life is mandatory. | Select for new designs requiring longer service life and higher noise immunity; pin-compatible drop-in replacement. |
| MCP1700-3302E/TO | Microchip 3.3V LDO in TO-92; 1.6μA IQ, 250mA output, 6V max input, no EN or BYP pins. | Limited to low-current, non-enable, through-hole applications-no thermal shutdown or current limit. | Only suitable for cost-sensitive, low-density legacy designs without enable control or protection requirements. |
Compared with AP139-33WL-7, AP7343-33WG-7 delivers superior efficiency and noise rejection for next-gen portable devices, while MCP1700-3302E/TO trades protection and features for minimal cost and footprint in simple fixed-rail applications.
Availability
AP139-33WL-7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensor nodes, USB-C peripheral hubs, and industrial handheld scanners requiring stable component supply despite its NRND status.
Supply support for AP139-33WL-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 manufacturing certified to IATF 16949 and product qualification per AEC-Q100/101 standards.
The AP139 belongs to Diodes' low-noise, low-IQ LDO family targeting battery-powered consumer and industrial applications-designed to deliver precision regulation with minimal thermal impact and robust fault tolerance.
FAQ
What is the minimum input voltage required for AP139-33WL-7 to maintain regulation at 300mA?
The minimum input voltage is calculated as VOUT + VDROPOUT = 3.3V + 0.45V = 3.75V. 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 = 300mA and VOUT ≥ 2.8V.
Can AP139-33WL-7 operate without the 10nF BYP capacitor?
No-the datasheet explicitly states that a 10nF capacitor between BYP and GND is necessary for low-noise operation. Omitting it degrades PSRR by up to 25dB at 1kHz and increases output noise, compromising performance in noise-sensitive analog or RF circuits.
Is AP139-33WL-7 pin-compatible with AP7343-33WG-7?
Yes-both use identical SOT25 packaging with matching pinout (VIN, GND, EN, BYP, VOUT). The AP7343-33WG-7 is Diodes' designated successor, offering enhanced specs while maintaining mechanical and electrical compatibility for seamless migration.
Does AP139-33WL-7 support reverse polarity protection?
No-the device lacks internal reverse-voltage protection. Applying reversed input voltage may damage the pMOS pass transistor. External protection (e.g., series Schottky diode or ideal diode controller) is required if reverse polarity exposure is possible in the end application.
AP139-33WL-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):
- 3.3V
- 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
AP139-33WL-7 FAQ
1.How can I place an order for AP139-33WL-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP139-33WL-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 AP139-33WL-7 reliable?
The price and inventory of AP139-33WL-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP139-33WL-7 is usually 5 days.
3.What payment methods are accepted for AP139-33WL-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP139-33WL-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP139-33WL-7?
AP139-33WL-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP139-33WL-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 AP139-33WL-7?
For technical support, including AP139-33WL-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP139-33WL-7 requirements.
6.How does Aetrix verify that AP139-33WL-7 is sourced from the original manufacturer or authorized distributors?
All AP139-33WL-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 AP139-33WL-7 meets industry standards.
7.What is the process for return or replacement of AP139-33WL-7?
All AP139-33WL-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP139-33WL-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 AP139-33WL-7 part is unused and in its original packaging.
Return procedure for AP139-33WL-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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