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Diodes Incorporated AP7335-39WG-7
- Part No.:
- AP7335-39WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7335-39WG-7.pdf
- Description:
- IC REG LINEAR 3.9V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:3,020
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Product details
Overview
AP7335-39WG-7 from Diodes Incorporated is a fixed-output 3.9V, 300mA low-dropout linear regulator with 35μA quiescent current, 150mV dropout at full load, 65dB PSRR at 1kHz, and fast 220μs startup-designed for battery-powered portable electronics requiring stable low-power voltage regulation.
For engineers reviewing the AP7335-39WG-7 datasheet, AP7335-39WG-7 pinout, AP7335-39WG-7 application, or AP7335-39WG-7 equivalent, key selection considerations include its SOT25 package, EN pin control logic, thermal shutdown threshold (145°C), ±2% output accuracy over –40°C to +85°C, and compatibility with 1μF ceramic output capacitors.
Technical Context
The AP7335-39WG-7 integrates a PMOS pass element, bandgap reference, error amplifier, current-limit circuitry, and thermal shutdown protection in a single monolithic IC. Its fixed 3.9V output eliminates external feedback resistors, simplifying layout and reducing BOM count.
It operates across 2V–6V input range with regulated output maintained down to 150mV headroom at 300mA load. The EN pin enables precise system-level power sequencing, while internal protection circuits respond to short-circuit (140mA clamp), overcurrent (600mA limit), and junction temperature exceeding 145°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.9V ±2% over –40°C to +85°C - ensures stable core/peripheral rail for 3.3V–4.2V battery systems. |
| Max Output Current | 300mA continuous - supports moderate-power microcontrollers, RF modules, and audio codecs. |
| Quiescent Current | 35μA typical - extends battery life in always-on or low-duty-cycle applications like Bluetooth headsets. |
| Dropout Voltage | 150mV at 300mA - enables operation from single-cell Li-ion (3.0V min) or two-cell alkaline (3.2V min) without brownout. |
| PSRR | 65dB at 1kHz - suppresses switching noise from adjacent DC/DC converters in mixed-signal portable designs. |
| Startup Time | 220μs - meets real-time wake-up requirements for GSM/TDMA burst-mode baseband power domains. |
| Thermal Shutdown | 145°C trigger with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
SOT25 package (3.0mm × 1.7mm × 1.3mm), RoHS-compliant, green molding compound, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 2V–6V; requires ≥1μF ceramic bypass capacitor placed adjacent to pin for stability and noise rejection. |
| 2 - GND | Power ground reference | Common return path for input/output currents; must connect to low-impedance ground plane to minimize noise coupling. |
| 3 - EN | Enable control input | Active-high logic interface (VIH ≥1.4V); tie to IN if always-on operation required; enables system-level power gating. |
| 4 - NC | No connection | Internally unconnected; must remain floating-no external bias or routing permitted. |
| 5 - OUT | Regulated output | Delivers 3.9V ±2%; requires ≥1μF ceramic capacitor with ESR >15mΩ directly at pin for transient stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low IQ operation | 35μA quiescent current enables >1-year battery life in coin-cell–powered IoT sensors with 10s sleep duty cycle. |
| Fast transient response | Stable under 0→300mA load steps with <20mV undershoot/overshoot - critical for DSP and GSM baseband ICs. |
| Integrated protection | Current limit (600mA), short-circuit clamp (140mA), and thermal shutdown (145°C) eliminate need for external fault management circuitry. |
| Capacitor flexibility | Stable with 1μF ceramic output capacitor - reduces board area vs. legacy LDOs requiring ≥10μF tantalum. |
| Wide input range | 2V–6V operation supports direct connection to Li-ion, Li-polymer, or dual-alkaline sources without pre-regulation. |
Applications
| Smartphone Power Rail | Bluetooth Headset Audio Supply |
|---|---|
|
Use Scenario: Regulating 3.9V supply for RF transceiver and audio codec in compact smartphone form factor. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering clean 3.9V rail independent of noisy main PMIC switchers. Use Value: 65dB PSRR at 1kHz rejects PMIC ripple; 220μs startup synchronizes with baseband processor wake-up signals. |
Use Scenario: Providing stable 3.9V bias to MEMS microphone and Class-D amplifier in battery-operated headset. IC Role / Device Role / Timing Role: Always-on LDO maintaining audio subsystem readiness during Bluetooth idle intervals. Use Value: 35μA IQ minimizes standby drain; 150mV dropout allows operation until battery reaches 3.0V cutoff. |
| MP3/MP4 Player Core Logic | Portable Medical Sensor Node |
|
Use Scenario: Powering ARM Cortex-M0+ MCU and SD card interface in handheld media player. IC Role / Device Role / Timing Role: Fixed-output LDO decoupling digital core from shared battery source. Use Value: ±2% output accuracy ensures reliable flash programming and memory timing margins across temperature. |
Use Scenario: Supplying 3.9V to ultra-low-power analog front-end and BLE SoC in wearable ECG patch. IC Role / Device Role / Timing Role: Precision LDO enabling sub-μA sleep current and rapid sensor wake-up. Use Value: Thermal shutdown (145°C) protects against skin-contact overheating; NC pin simplifies layout in space-constrained flex PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | 3.3V fixed output, 250mA max, 1.8μA IQ, SOT23-3 package - lower IQ but 0.6V lower output and no EN pin. | Not suitable where 3.9V rail is required for logic compatibility or margin above 3.3V peripherals. | Select only if system uses 3.3V logic and ultra-low standby current dominates over output voltage requirement. |
| Torex XC6206P392MR-G | 3.9V fixed output, 250mA max, 12μA IQ, SOT23-5 package - lower IQ and same VOUT, but lacks EN pin and thermal shutdown. | Requires external enable circuitry and thermal monitoring in high-ambient or high-power-density layouts. | Prefer when minimal IQ is critical and thermal derating can be managed externally; avoid in sealed enclosures or high-temp environments. |
Compared with MCP1700-3302E/TO and XC6206P392MR-G, the AP7335-39WG-7 uniquely delivers 3.9V output with integrated EN control, thermal shutdown, and 300mA capability - making it the only drop-in solution for space-constrained portable designs needing precise 3.9V regulation with robust fault protection.
Availability
AP7335-39WG-7 is available at Aetrix Electronics and suitable for smartphone power rails, Bluetooth headset audio supplies, MP3/MP4 player core logic, and portable medical sensor nodes requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for AP7335-39WG-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 for consumer, computing, communications, industrial, and automotive markets.
The AP7335 series belongs to Diodes' precision low-dropout regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, fast transient response, and integrated protection in miniature packages.
FAQ
What is the minimum input voltage required for AP7335-39WG-7 to maintain regulation at 300mA load?
The AP7335-39WG-7 requires a minimum input voltage of 4.05V to sustain 3.9V output at 300mA, based on its 150mV typical dropout voltage (3.9V + 0.15V = 4.05V). Absolute minimum VIN is specified as 2.0V, but regulation fails below dropout headroom. Input below 4.05V causes proportional output droop.
Can AP7335-39WG-7 operate without an output capacitor?
No. The AP7335-39WG-7 requires a minimum 1μF ceramic output capacitor with ESR >15mΩ for stability and transient response. Omitting it causes oscillation, excessive overshoot/undershoot during load steps, and potential thermal shutdown. Larger capacitance improves line/load regulation but does not replace the minimum requirement.
Is the NC pin on AP7335-39WG-7 electrically isolated or internally tied to another node?
The NC (pin 4) on AP7335-39WG-7 is fully electrically isolated - it has no internal connection to any circuit node. It must remain unconnected and un-biased per datasheet guidance. Routing traces to or placing solder on this pin risks mechanical stress or unintended coupling, violating the validated SOT25 layout.
How does the EN pin behave during power-up, and what is the recommended pull-up configuration?
The EN pin is active-high with VIH ≥1.4V and VIL ≤0.4V. During power-up, it must reach VIH before IN stabilizes to ensure proper startup; a weak pull-up to IN (e.g., 100kΩ) is recommended if always-on operation is needed. Driving EN from a microcontroller GPIO requires compatible logic levels and sufficient drive strength to overcome leakage (<1μA).
AP7335-39WG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.2V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
AP7335-39WG-7 FAQ
1.How can I place an order for AP7335-39WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7335-39WG-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 AP7335-39WG-7 reliable?
The price and inventory of AP7335-39WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7335-39WG-7 is usually 5 days.
3.What payment methods are accepted for AP7335-39WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7335-39WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7335-39WG-7?
AP7335-39WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7335-39WG-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 AP7335-39WG-7?
For technical support, including AP7335-39WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7335-39WG-7 requirements.
6.How does Aetrix verify that AP7335-39WG-7 is sourced from the original manufacturer or authorized distributors?
All AP7335-39WG-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 AP7335-39WG-7 meets industry standards.
7.What is the process for return or replacement of AP7335-39WG-7?
All AP7335-39WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7335-39WG-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 AP7335-39WG-7 part is unused and in its original packaging.
Return procedure for AP7335-39WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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