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Diodes Incorporated AP7335-18WG-7
- Part No.:
- AP7335-18WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7335-18WG-7.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
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Product details
Overview
AP7335-18WG-7 from Diodes Incorporated is a fixed-output 1.8V, 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 AP7335-18WG-7 datasheet, AP7335-18WG-7 pinout, AP7335-18WG-7 application, or AP7335-18WG-7 equivalent, this page delivers verified package mapping (SOT25), terminal roles (IN/GND/EN/OUT), thermal shutdown threshold (145°C), load transient response data, and real-world selection guidance against comparable LDOs.
Technical Context
The AP7335-18WG-7 integrates a PMOS pass element, bandgap reference, error amplifier, and protection circuitry-including current limit (600mA typ.), short-circuit clamp (140mA), and thermal shutdown (145°C activation / 130°C hysteresis). It operates across 2V–6V input while maintaining regulation down to 1.8V output.
Its architecture enables stable operation with only 1μF ceramic output capacitance (ESR ≥15mΩ), supports no-load regulation, and delivers fast load transient recovery (<100μs undershoot suppression) critical for GSM/TDMA baseband power rails where load steps from 10mA to 300mA occur in <1μs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% over –40°C to +85°C ambient; eliminates external resistor divider and associated tolerance stack-up. |
| Max Output Current | 300mA continuous; sufficient for powering ARM Cortex-M0/M3 cores, RF transceivers, and audio codecs in compact wearables. |
| Quiescent Current | 35μA typical at zero load; extends battery life in always-on sensor nodes and standby-mode peripherals. |
| Dropout Voltage | 150mV at 300mA (VOUT ≥2.5V); enables 1.8V output from 2.0V Li-ion or 2xAA alkaline sources without brownout risk. |
| PSRR | 65dB at 1kHz; suppresses switching noise from adjacent DC-DC converters feeding shared input rails. |
| Startup Time | 220μs from EN high-to-VOUT regulation; meets real-time wake-up timing for Bluetooth LE and Zigbee sleep/wake cycles. |
| Thermal Shutdown | Activates at 145°C junction temperature with 15°C hysteresis; prevents permanent damage during sustained 300mA loads in confined SOT25 layouts. |
Pinout & Package
SOT25 package (3.0mm × 1.7mm × 1.3mm), RoHS-compliant "Green" molding compound, lead-free finish. Thermal pad not present; θJA = 187°C/W on FR-4 with minimum recommended copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 2V–6V; requires ≥1μF ceramic bypass capacitor placed adjacent to pin to suppress input ripple and ensure stability. |
| 2 - GND | Power ground reference | Low-impedance return path for IN, OUT, and EN; must connect directly to PCB ground plane with minimal trace length. |
| 3 - EN | Enable control input | Active-high logic interface (VIH ≥1.4V, VIL ≤0.4V); ties to IN for always-on operation or microcontroller GPIO for dynamic power gating. |
| 4 - NC | No connection | Internally unconnected; must remain floating-no PCB trace or solder mask opening required. |
| 5 - OUT | Regulated output | Delivers stable 1.8V; requires ≥1μF ceramic capacitor (ESR ≥15mΩ) placed within 2mm of pin to dampen load transients. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 35μA quiescent current enables >1-year battery life in coin-cell-powered IoT sensors operating at 10μA average load. |
| Fast transient response | Stabilizes within 50μs after 10mA→300mA load step-prevents voltage droop below 1.75V in DSP core supplies during burst processing. |
| Integrated protection | Current limit (600mA), short-circuit clamp (140mA), and thermal shutdown (145°C) eliminate need for external fault management circuitry. |
| Minimal external components | Operates stably with only two 1μF ceramic capacitors-reduces BOM count, PCB area, and assembly cost versus legacy LDOs requiring bulk electrolytics. |
| Wide input range | 2V–6V operation supports direct connection to single-cell Li-ion (2.7–4.2V), 2xAA (2.0–3.2V), or USB-powered systems without pre-regulation. |
Applications
| Bluetooth Headset Power Rail | MP3 Player Core Logic Supply |
|---|---|
|
Use Scenario: Powers Bluetooth radio IC and audio DAC in compact earbud form factor with 3.7V Li-ion battery. IC Role / Device Role / Timing Role: Primary 1.8V LDO delivering clean, low-noise bias to RF transceiver and digital audio subsystem. Use Value: 65dB PSRR rejects noise from switching charger IC sharing same input rail; 220μs startup enables instant audio playback on button press. |
Use Scenario: Supplies 1.8V to ARM7TDMI processor and NAND flash controller in portable media player. IC Role / Device Role / Timing Role: Main system LDO providing regulated core voltage during variable CPU load (10mA–300mA). Use Value: Fast load transient response prevents brownout resets during flash write bursts; 35μA IQ extends playback time by 8–12% versus 100μA alternatives. |
| Smartphone Camera Module | Wearable Sensor Hub |
|
Use Scenario: Powers image signal processor (ISP) and CMOS image sensor in ultra-thin smartphone camera module. IC Role / Device Role / Timing Role: Dedicated 1.8V analog supply isolating sensitive imaging circuitry from noisy digital domains. Use Value: Low dropout (150mV) allows operation down to 1.95V battery voltage-extending usable battery range by 5–7% before system shutdown. |
Use Scenario: Supplies 1.8V to MEMS accelerometer, gyroscope, and BLE SoC in fitness tracker with CR2032 coin cell. IC Role / Device Role / Timing Role: Always-on LDO maintaining regulation during motion-triggered wake events and BLE advertising intervals. Use Value: 35μA IQ enables >18 months battery life at 1Hz sampling; thermal shutdown protects against enclosure overheating during extended GPS sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1802E/TO | 250mA max output, 1.8V fixed, 1.8μA IQ (lower), but 600mV dropout at full load (higher) | Better for ultra-low-power sensor nodes; unsuitable for 300mA burst loads like camera ISPs | Select when IQ <5μA is mandatory and peak current ≤250mA; avoid for fast-transient or high-current apps. |
| Torex XC6206P182MR-G | 300mA max, 1.8V fixed, 1.0μA IQ, but only 45dB PSRR at 1kHz and no thermal shutdown | Lower noise sensitivity; lacks fault protection for industrial or automotive environments | Choose for cost-sensitive, non-safety-critical consumer devices where PSRR >60dB and thermal safety are not required. |
Compared with MCP1700-1802E/TO and XC6206P182MR-G, the AP7335-18WG-7 uniquely balances 300mA capability, 35μA IQ, 65dB PSRR, and full protection suite-making it optimal for battery-powered systems demanding both efficiency and robustness.
Availability
AP7335-18WG-7 is available at Aetrix Electronics and suitable for Bluetooth headset power rails, MP3 player core logic supplies, and wearable sensor hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP7335-18WG-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 power management, signal integrity, and connectivity applications.
The AP7335 series belongs to Diodes' precision LDO portfolio, engineered specifically for portable and battery-operated equipment where ultra-low quiescent current, fast transient response, and small-footprint packaging are critical design constraints.
FAQ
What is the minimum input voltage required for AP7335-18WG-7 to maintain 1.8V regulation at 300mA?
The minimum input voltage is 1.95V: calculated as VOUT + VDROP = 1.8V + 150mV. Below this, dropout occurs and output voltage falls proportionally. The device remains functional down to VIN = 2.0V per datasheet operating conditions, ensuring margin for battery voltage sag under load.
Can AP7335-18WG-7 operate without an output capacitor?
No. A minimum 1μF ceramic output capacitor with ESR ≥15mΩ is mandatory for stability and transient response. Omitting it causes oscillation, excessive overshoot/undershoot during load steps, and potential thermal shutdown. The capacitor must be placed within 2mm of the OUT and GND pins.
Is the EN pin internally pulled up or does it require external biasing?
The EN pin has no internal pull-up or pull-down. It must be actively driven: tie to IN for always-on operation, or connect to a microcontroller GPIO capable of meeting VIH ≥1.4V and VIL ≤0.4V thresholds. Floating EN results in undefined output state and possible malfunction.
How does thermal shutdown behave under sustained 300mA load in a standard SOT25 layout?
With θJA = 187°C/W and 25°C ambient, power dissipation PD = (VIN − 1.8V) × 0.3A. At VIN = 4.2V, PD = 0.72W → ΔT = 135°C → TJ ≈ 160°C, triggering shutdown. To avoid cycling, reduce VIN, increase copper area, or use DFN2020-6 (θJA = 251°C/W) for higher power density.
AP7335-18WG-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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 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
AP7335-18WG-7 FAQ
1.How can I place an order for AP7335-18WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7335-18WG-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 AP7335-18WG-7 reliable?
The price and inventory of AP7335-18WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7335-18WG-7 is usually 5 days.
3.What payment methods are accepted for AP7335-18WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7335-18WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7335-18WG-7?
AP7335-18WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7335-18WG-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 AP7335-18WG-7?
For technical support, including AP7335-18WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7335-18WG-7 requirements.
6.How does Aetrix verify that AP7335-18WG-7 is sourced from the original manufacturer or authorized distributors?
All AP7335-18WG-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 AP7335-18WG-7 meets industry standards.
7.What is the process for return or replacement of AP7335-18WG-7?
All AP7335-18WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7335-18WG-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 AP7335-18WG-7 part is unused and in its original packaging.
Return procedure for AP7335-18WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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