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Diodes Incorporated AP7335-33WG-7
- Part No.:
- AP7335-33WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7335-33WG-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:855
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Product details
Overview
AP7335-33WG-7 from Diodes Incorporated is a fixed-output 3.3V, 300mA low-dropout linear regulator with 35μA quiescent current, 150mV dropout at full load, 65dB PSRR at 1kHz, and fast 220μs startup - designed for power-sensitive portable electronics including Bluetooth headsets and MP3 players.
For engineers reviewing the AP7335-33WG-7 datasheet, AP7335-33WG-7 pinout, AP7335-33WG-7 application, or AP7335-33WG-7 equivalent, key selection criteria include guaranteed 3.3V ±2% output accuracy across –40°C to +85°C, stability with 1μF ceramic output capacitor, EN pin logic-level control (VIH = 1.4V), and thermal shutdown at 145°C.
Technical Context
The AP7335-33WG-7 integrates a P-channel MOSFET pass element, precision 0.8V bandgap reference, error amplifier, and protection circuitry (current limit, thermal shutdown) in a single SOT25 package. Its fixed 3.3V output eliminates external feedback resistors, simplifying layout while maintaining tight regulation.
It operates across 2V–6V input range with load regulation of ±0.6% and line regulation of 0.02–0.20%/V. The device delivers stable output under fast transient loads (0–300mA step) without overshoot or excessive droop, enabled by optimized internal compensation and low ESR capacitor compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over –40°C to +85°C - ensures reliable MCU core or RF IC supply without calibration. |
| Max Output Current | 300mA continuous - supports baseband processors, audio codecs, and BLE SoCs in compact wearables. |
| Quiescent Current | 35μA typical - extends battery life in always-on sensor nodes and standby-mode peripherals. |
| Dropout Voltage | 150mV at 300mA (VOUT ≥ 2.5V) - enables operation down to 3.45V input, critical for single-cell Li-ion systems. |
| PSRR | 65dB at 1kHz - suppresses switching noise from DC/DC converters feeding the LDO input rail. |
| Startup Time | 220μs - meets real-time wake-up requirements for GSM/TDMA burst-mode applications. |
| Thermal Shutdown | Triggers at 145°C with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
SOT25 (5-pin, 2.9mm × 2.8mm × 1.3mm) with exposed thermal pad (not electrically connected). Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = NC (no connection), Pin 5 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2V–6V; requires ≥1μF ceramic bypass to GND close to pin for noise immunity and stability. |
| GND (Pin 2) | Power ground reference | Low-impedance return path for IN, OUT, and EN; must connect directly to PCB ground plane. |
| EN (Pin 3) | Enable control input | Active-high logic: VIH ≥ 1.4V turns regulator on; VIL ≤ 0.4V disables output and reduces IQ to 0.1μA. |
| NC (Pin 4) | No connection | Internally unconnected; must remain floating or grounded - no external tie required. |
| OUT (Pin 5) | Regulated output | Delivers 3.3V ±2%; requires ≥1μF ceramic capacitor (ESR >15mΩ) placed adjacent to pin for transient stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 35μA typical enables >1-year battery life in coin-cell-powered IoT sensors with periodic wake-up. |
| Fast transient response | Stable under 0–300mA load steps with <20mV undershoot/overshoot - sustains clean supply for high-speed DSP cores. |
| Integrated protection | Current limit (~600mA), short-circuit clamp (~140mA), and thermal shutdown prevent field failures in unattended devices. |
| Small-footprint packaging | SOT25 footprint allows placement near power-hungry ICs with minimal trace inductance and thermal resistance (θJA = 187°C/W). |
| Green RoHS-compliant construction | Lead-free finish and bromine/antimony-free molding compound meet EU Directive 2002/95/EC exemptions. |
Applications
| Bluetooth Headset Power Management | MP3 Player Core Supply |
|---|---|
|
Use Scenario: Powers Bluetooth radio IC and audio DAC in compact earbud form factor with single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Primary 3.3V LDO delivering regulated rail to RF transceiver and codec; EN pin synchronized with Bluetooth connection state. Use Value: 35μA IQ minimizes standby drain; 220μs startup enables instant audio playback after button press; 150mV dropout preserves runtime down to 3.45V cell voltage. |
Use Scenario: Supplies 3.3V to ARM Cortex-M0 microcontroller and NAND flash memory in portable music player. IC Role / Device Role / Timing Role: Fixed-output LDO providing clean, low-noise supply for digital logic and memory interface; decoupled with 1μF ceramic caps per pin. Use Value: ±2% output accuracy ensures reliable flash programming; 65dB PSRR rejects noise from display backlight DC/DC converter; SOT25 fits tight board space. |
| Smartphone Subsystem Rail | Wearable Sensor Hub |
|
Use Scenario: Powers camera module ISP and touch controller in smartphone auxiliary power domain. IC Role / Device Role / Timing Role: Secondary LDO activated only during camera preview mode via EN signal from application processor. Use Value: Fast 220μs turn-on eliminates preview lag; load regulation ±0.6% maintains timing margins for I²C/SPI interfaces; thermal shutdown protects against enclosure overheating. |
Use Scenario: Regulates 3.3V for accelerometer, gyroscope, and BLE radio in fitness tracker with CR2032 coin cell. IC Role / Device Role / Timing Role: Always-on LDO supplying ultra-low-power sensors; EN tied to IN for continuous operation. Use Value: 35μA IQ extends battery life beyond 6 months; stable with 1μF output cap saves board area; -40°C to +85°C rating covers outdoor use cases. |
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 | 250mA max output, 1.8μA IQ, 600mV dropout at 250mA - lower IQ but higher dropout and reduced current capability. | Best for ultra-low-power sensor nodes where 250mA peak is sufficient and input voltage ≥4.0V is guaranteed. | Select when minimum IQ dominates design priority and load current never exceeds 250mA. |
| TPS73633DBVT | 400mA max output, 175μA IQ, 75mV dropout at 400mA - higher current and lower dropout, but 5× higher quiescent current. | Suitable for higher-current subsystems (e.g., Wi-Fi coexistence modules) where faster transient response and lower dropout justify higher IQ. | Select when system demands >300mA or sub-100mV dropout is mandatory, and battery capacity permits higher standby drain. |
Compared with MCP1700-3302E/TO, AP7335-33WG-7 delivers 20% more current and 150mV lower dropout at 300mA, trading only 33μA higher IQ. Against TPS73633DBVT, it cuts IQ by 140μA but sacrifices 75mV dropout and 100mA headroom - ideal for cost- and size-constrained portable designs prioritizing battery longevity.
Availability
AP7335-33WG-7 is available at Aetrix Electronics and suitable for Bluetooth headset power management, MP3 player core supply, and wearable sensor hub applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AP7335-33WG-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 high-reliability power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP7335 belongs to Diodes' low-quiescent-current LDO portfolio, engineered specifically for battery-powered portable electronics where extended runtime, small footprint, and robust transient performance are essential design requirements.
FAQ
What is the minimum input voltage required for AP7335-33WG-7 to maintain regulation at 300mA load?
The AP7335-33WG-7 requires VIN ≥ VOUT + VDropout = 3.3V + 0.15V = 3.45V to sustain regulation at 300mA. Below this, output voltage drops nonlinearly; datasheet specifies minimum VIN = 2.0V for no-load operation, but full-load dropout rises to 300mV below 2.5V output versions.
Can AP7335-33WG-7 operate without an output capacitor?
No. The AP7335-33WG-7 requires a minimum 1μF ceramic output capacitor with ESR >15mΩ for stability. Omitting it causes oscillation and output voltage collapse under load. Larger capacitance improves transient response but does not replace the minimum requirement.
Is the NC pin (Pin 4) in SOT25 required to be grounded or left floating?
Pin 4 is internally unconnected and must remain floating or be grounded - it must not be tied to any active signal or voltage rail. Grounding it poses no risk and may improve mechanical stability; connecting it to IN, OUT, or EN violates the pin description and risks malfunction.
How does thermal shutdown behave during sustained overload?
When junction temperature reaches ~145°C, the AP7335-33WG-7 disables output and enters thermal shutdown. It remains off until temperature falls to ~130°C (15°C hysteresis), then resumes regulation. Under continuous overload, this causes cycling - visible as intermittent output - protecting the die from permanent damage.
AP7335-33WG-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):
- 3.3V
- 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
AP7335-33WG-7 FAQ
1.How can I place an order for AP7335-33WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7335-33WG-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 AP7335-33WG-7 reliable?
The price and inventory of AP7335-33WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7335-33WG-7 is usually 5 days.
3.What payment methods are accepted for AP7335-33WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7335-33WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7335-33WG-7?
AP7335-33WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7335-33WG-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 AP7335-33WG-7?
For technical support, including AP7335-33WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7335-33WG-7 requirements.
6.How does Aetrix verify that AP7335-33WG-7 is sourced from the original manufacturer or authorized distributors?
All AP7335-33WG-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 AP7335-33WG-7 meets industry standards.
7.What is the process for return or replacement of AP7335-33WG-7?
All AP7335-33WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7335-33WG-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 AP7335-33WG-7 part is unused and in its original packaging.
Return procedure for AP7335-33WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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