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Diodes Incorporated AP7331-33WG-7
- Part No.:
- AP7331-33WG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7331-33WG-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:14,300
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Product details
Overview
AP7331-33WG-7 from Diodes Incorporated is a fixed-output 3.3V, 300mA low-dropout linear regulator in SOT25 package with 65μA quiescent current, 300mV dropout at full load, and active-high enable control. It integrates current limit, thermal shutdown, and short-circuit protection, and is optimized for battery-powered wireless LAN cards and XDSL routers requiring stable low-power voltage regulation.
For engineers reviewing the AP7331-33WG-7 datasheet, AP7331-33WG-7 pinout, AP7331-33WG-7 application, or AP7331-33WG-7 equivalent, key selection criteria include dropout voltage under 300mA load, PSRR of 65dB at 100Hz, fast 80μs startup time, stability with 1μF ceramic output capacitor, and operation across –40°C to +85°C ambient temperature.
Technical Context
The AP7331-33WG-7 implements a PMOS pass transistor architecture enabling low dropout (300mV typ. at 300mA) and ultra-low quiescent current (65μA typ. across input range). Its internal 0.4V bandgap reference and error amplifier deliver ±2% output accuracy over temperature and load.
It features active-high EN control with VIH = 1.4V and VIL = 0.4V, integrated thermal shutdown at 140°C with 15°C hysteresis, and dual-stage overcurrent protection: 100mA short-circuit clamp and 400–600mA current limit threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over –40°C to +85°C and 0–300mA load |
| Max Output Current | 300mA continuous; internal current limit clamps at 400–600mA |
| Dropout Voltage | 300mV typical at 300mA load - enables regulation down to VIN = 3.6V |
| Quiescent Current | 65μA typical at full 300mA load - preserves battery life in standby |
| PSRR | 65dB typical at 100Hz - suppresses low-frequency power supply noise |
| Startup Time | 80μs typical - supports rapid wake-up from low-power states |
| Input Voltage Range | 2.0V to 6.0V - compatible with single-cell Li-ion, Li-poly, and 3.3V/5V rails |
Pinout & Package
AP7331-33WG-7 is housed in a RoHS-compliant, lead-free SOT25 (SC-74A) package measuring 2.9mm × 1.6mm × 1.1mm, with exposed pad for thermal enhancement and "Green" molding compound (no Br/Sb).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Input voltage supply | Accepts 2–6V; requires ≥1μF ceramic bypass to GND for stability |
| GND (Pin 2) | Power ground reference | Common return path for IN, OUT, EN, and internal circuitry |
| EN (Pin 3) | Enable control input | Active-high logic; drives regulator ON when ≥1.4V, OFF when ≤0.4V |
| NC (Pin 4) | No connection | Internally unconnected; must be left floating or grounded per layout guidelines |
| OUT (Pin 5) | Regulated output | Delivers stable 3.3V; requires ≥1μF ceramic capacitor to GND for transient response |
Key Features
| Feature | Design Value |
|---|---|
| Low IQ operation | 65μA quiescent current at full 300mA load - extends battery runtime in always-on systems |
| Fast transient response | Minimal overshoot/undershoot during 0→300mA load steps - protects sensitive RF/baseband ICs |
| Stability with small capacitors | Guaranteed stable with 1μF X5R/X7R ceramic output cap - reduces BOM count and board area |
| Integrated fault protection | Thermal shutdown (140°C), short-circuit clamp (100mA), and current limit (600mA max) - eliminates need for external protection circuitry |
| Wide input compatibility | Operates from 2V to 6V - supports Li-ion (2.7–4.2V), LiFePO₄ (2–3.6V), and 3.3V/5V system rails |
Applications
| Wireless LAN Cards | XDSL Routers |
|---|---|
|
Use Scenario: Powering 2.4GHz/5GHz WLAN baseband and RF transceivers in compact PCIe Mini Card or M.2 modules. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying core logic and analog sections of Wi-Fi chipsets. Use Value: 80μs startup and fast load transient response prevent communication dropouts during packet bursts; 65μA IQ minimizes idle power draw. |
Use Scenario: Regulating 3.3V supply for ADSL/VDSL line interface units (LIUs), PHYs, and microcontrollers in residential gateways. IC Role / Device Role / Timing Role: Secondary LDO delivering clean, low-noise 3.3V to DSL analog front-end and management MCU. Use Value: 65dB PSRR at 100Hz suppresses switching noise from upstream DC/DC converters; thermal shutdown prevents field failures under sustained load. |
| Notebook Computers | Battery-Powered Equipment |
|
Use Scenario: Supplying 3.3V to embedded controller (EC), touchpad, or USB hub controllers in space-constrained laptop subsystems. IC Role / Device Role / Timing Role: Always-on LDO maintaining real-time clock and wake logic during S3/S4 sleep states. Use Value: 65μA IQ ensures multi-week battery hold-up time; SOT25 footprint fits tight layout constraints near EC. |
Use Scenario: Providing regulated 3.3V to portable medical sensors, handheld test equipment, and IoT edge nodes powered by coin cells or single Li-ion cells. IC Role / Device Role / Timing Role: Main system LDO enabling deep-sleep modes while retaining fast wake capability. Use Value: 300mV dropout allows operation down to 3.6V input - maximizes usable battery capacity from 4.2V→3.0V discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO (Microchip) | 250mA rated, 1.6μA IQ, no enable pin, 600mV dropout at 250mA | Lacks EN control and fast transient response; suited only for ultra-low-IQ always-on rails | Select when lowest possible standby current is critical and enable control is unnecessary |
| Torex XC6206P332MR-G (Torex) | 300mA rated, 12μA IQ, no enable pin, 400mV dropout at 300mA, no thermal shutdown | Missing EN and thermal protection; limited to benign thermal environments | Choose only for cost-sensitive, non-thermally-challenged applications where EN is tied high externally |
Compared with MCP1700-3302E/TO and XC6206P332MR-G, AP7331-33WG-7 uniquely combines 300mA capability, 65μA IQ, active-high EN, 300mV dropout, and full fault protection - making it the only option suitable for thermally demanding, battery-operated systems requiring dynamic power sequencing.
Availability
AP7331-33WG-7 is available at Aetrix Electronics and suitable for wireless LAN cards, XDSL routers, and notebook computers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP7331-33WG-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 industrial, computing, and communications markets.
The AP7331 belongs to Diodes' low-dropout linear regulator product line, engineered specifically for portable and battery-powered applications demanding ultra-low quiescent current, fast transient response, and robust fault protection in minimal footprints.
FAQ
What is the minimum input voltage required for AP7331-33WG-7 to maintain regulation at 300mA load?
The AP7331-33WG-7 requires VIN ≥ VOUT + VDROP = 3.3V + 0.3V = 3.6V to sustain regulation at 300mA. At lower inputs, output voltage drops linearly; the 300mV dropout is typical at 25°C and degrades slightly at –40°C or +85°C per datasheet Figure 11.
Can AP7331-33WG-7 operate without an output capacitor?
No. The AP7331-33WG-7 requires a minimum 1μF ceramic output capacitor (X5R/X7R, 10–200mΩ ESR) between OUT and GND for stability and transient response. Omitting it causes oscillation, excessive ripple, and potential damage during load steps.
How does the EN pin behave during power-up if left unconnected?
An unconnected EN pin is not internally pulled up or down; it floats and may cause erratic turn-on behavior due to noise coupling. Per datasheet Application Note, EN must be tied to IN (for always-on operation) or driven by a clean logic source meeting VIH ≥ 1.4V and VIL ≤ 0.4V.
Is AP7331-33WG-7 qualified for automotive applications?
No. AP7331-33WG-7 is specified for –40°C to +85°C ambient operation and lacks AEC-Q100 qualification, extended temperature grade (–40°C to +125°C), or automotive-specific reliability testing. It is intended for commercial/industrial portable equipment only.
AP7331-33WG-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):
- 0.55V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 75 µA
- Current - Supply (Max):
- 85 µA
- PSRR:
- 65dB (100Hz)
- 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
AP7331-33WG-7 FAQ
1.How can I place an order for AP7331-33WG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7331-33WG-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 AP7331-33WG-7 reliable?
The price and inventory of AP7331-33WG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7331-33WG-7 is usually 5 days.
3.What payment methods are accepted for AP7331-33WG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7331-33WG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7331-33WG-7?
AP7331-33WG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7331-33WG-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 AP7331-33WG-7?
For technical support, including AP7331-33WG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7331-33WG-7 requirements.
6.How does Aetrix verify that AP7331-33WG-7 is sourced from the original manufacturer or authorized distributors?
All AP7331-33WG-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 AP7331-33WG-7 meets industry standards.
7.What is the process for return or replacement of AP7331-33WG-7?
All AP7331-33WG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7331-33WG-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 AP7331-33WG-7 part is unused and in its original packaging.
Return procedure for AP7331-33WG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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