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Diodes Incorporated AP7331-33SNG-7
- Part No.:
- AP7331-33SNG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AP7331-33SNG-7.pdf
- Description:
- IC REG LIN 3.3V 300MA 6DFN2020
- Quantity:
- Payment:
- Shipping:
Inventory:8,011
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Product details
Overview
AP7331-33SNG-7 from Diodes Incorporated is a fixed-output 3.3V, 300mA low-dropout linear regulator in DFN2020-6 package with enable control, 65μA quiescent current, 300mV dropout at full load, and fast 80μs startup-designed for power management in battery-powered wireless LAN cards and XDSL routers.
For engineers reviewing the AP7331-33SNG-7 datasheet, AP7331-33SNG-7 pinout, AP7331-33SNG-7 application, or AP7331-33SNG-7 equivalent, key selection criteria include low-IQ operation across 2–6V input, ±2% output accuracy over –40°C to 85°C, PSRR of 65dB at 100Hz, and stability with 1μF ceramic output capacitor.
Technical Context
The AP7331-33SNG-7 integrates a PMOS pass element, bandgap reference (0.4V), error amplifier, thermal shutdown (140°C trip, 15°C hysteresis), and current-limit protection (400–600mA). Its architecture enables stable regulation without minimum load and supports fast transient response via internal compensation optimized for low-ESR ceramic capacitors.
EN pin logic thresholds (VIH = 1.4V, VIL = 0.4V) ensure compatibility with 1.8V/3.3V GPIOs; the fixed 3.3V output eliminates external resistor network requirements while maintaining identical electrical performance as adjustable variants.
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 - sufficient for single-chip Wi-Fi SoCs or DSL PHYs with burst-mode operation. |
| Quiescent Current | 65μA typical at full load - extends battery runtime in always-on IoT sensors and portable gateways. |
| Dropout Voltage | 300mV typical at 300mA - enables operation down to 3.6V input, supporting single-cell Li-ion or 3×AA alkaline stacks. |
| PSRR | 65dB at 100Hz - suppresses ripple from switching DC/DC converters feeding the LDO input. |
| Start-up Time | 80μs - allows rapid power cycling of peripheral subsystems in energy-harvesting applications. |
| Thermal Shutdown | 140°C junction trip with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
AP7331-33SNG-7 uses the DFN2020-6 (2.0mm × 2.0mm, 0.65mm pitch) package with wettable flank leads for automated optical inspection. Thermal resistance θJA is 167°C/W on double-sided FR-4 PCB with bottom copper plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 3) | Input voltage supply | Accepts 2–6V; requires ≥1μF ceramic bypass to GND close to pin for noise rejection and stability. |
| GND (Pin 2) | Power ground reference | Low-impedance return path; must connect directly to PCB ground plane under package for thermal and EMI performance. |
| EN (Pin 1) | Enable control input | Active-high logic interface; drives regulator ON when ≥1.4V, OFF when ≤0.4V - enables system-level power sequencing. |
| OUT (Pin 4) | Regulated output | Delivers stable 3.3V; requires ≥1μF ceramic capacitor between OUT and GND for transient response and stability. |
| NC (Pins 5, 6) | No connection | Unbonded die pads; must remain floating - no routing or soldering permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 65μA across full 0–300mA load range - reduces standby power loss by >50% vs. legacy LDOs in always-on nodes. |
| Fast transient response | Controlled undershoot/overshoot during 0→300mA load steps - avoids brownout resets in GSM/EDGE baseband processors. |
| Stability with small capacitors | Guaranteed stable with 1μF X7R/X5R ceramic output cap - eliminates need for bulky tantalum or high-ESR electrolytics. |
| Integrated protection | Current limit (≈600mA), short-circuit clamp (≈100mA), and thermal shutdown - removes need for external fault-handling circuitry. |
| Green packaging | RoHS-compliant, halogen-free molding compound - meets IPC-1752A environmental compliance requirements for industrial shipments. |
Applications
| Wireless LAN Modules | XDSL Customer Premises Equipment |
|---|---|
|
Use Scenario: Powering 802.11n/ac radio transceivers and baseband processors in compact USB Wi-Fi adapters. IC Role / Device Role / Timing Role: Primary 3.3V supply for RF front-end and MAC controller, enabling fast wake-from-sleep transitions. Use Value: 80μs startup and 65μA IQ reduce average power consumption during DTIM beacon intervals, extending adapter battery life. |
Use Scenario: Regulating auxiliary 3.3V rails in ADSL2+/VDSL2 modems handling voice, data, and VoIP simultaneously. IC Role / Device Role / Timing Role: Clean post-regulation stage after buck converter, suppressing switcher ripple before analog line drivers. Use Value: 65dB PSRR at 100Hz attenuates low-frequency switching noise, preventing audible line hum and data errors. |
| Notebook Subsystem Power | Battery-Powered Test Instruments |
|
Use Scenario: Supplying USB 3.0 hub controllers and PCIe endpoint logic in ultrabook docking stations. IC Role / Device Role / Timing Role: Local point-of-load regulator with EN-controlled sequencing synchronized to host enumeration timing. Use Value: EN pin compatibility with 1.8V GPIOs allows direct control from embedded controller, eliminating level-shifter components. |
Use Scenario: Powering precision ADCs, op-amps, and microcontrollers in handheld multimeters and signal analyzers. IC Role / Device Role / Timing Role: Low-noise, low-drift 3.3V reference source for analog signal chains requiring <0.1% accuracy. Use Value: ±2% output tolerance and <0.2%/V line regulation ensure measurement repeatability across varying battery voltage (3.0–4.2V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/TT (Microchip) | 250mA max output, 1.6μA IQ, SOT23-5 package - lower current but ultra-low quiescent current. | Suitable only for sub-250mA loads; lacks EN pin - requires external MOSFET for enable functionality. | Select when lowest possible standby power dominates over current capability and enable integration. |
| TLS850F0TES/V0X (Infineon) | 500mA output, 30μA IQ, AEC-Q100 qualified, integrated watchdog - automotive-grade with higher cost and qualification overhead. | Designed for automotive body electronics; overqualified for consumer portables with stricter qualification and longer lead times. | Select only for automotive programs requiring ASIL-B compliance; avoid for cost-sensitive industrial designs. |
Compared with MCP1700T-3302E/TT and TLS850F0TES/V0X, AP7331-33SNG-7 uniquely balances 300mA drive, 65μA IQ, integrated EN, and DFN2020-6 footprint - making it optimal for space-constrained, battery-operated networking gear where moderate current and fast enable timing are essential.
Availability
AP7331-33SNG-7 is available at Aetrix Electronics and suitable for wireless LAN modules, XDSL CPE, and portable test instrumentation requiring stable component supply, consistent parametric performance, and RoHS-compliant green packaging.
Supply support for AP7331-33SNG-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 series belongs to Diodes' low-power LDO portfolio, engineered specifically for battery-constrained applications demanding ultra-low IQ, fast transient response, and minimal external component count - targeting portable networking and embedded edge devices.
FAQ
What is the minimum input voltage required for AP7331-33SNG-7 to maintain regulation at 300mA?
The AP7331-33SNG-7 requires VIN ≥ VOUT + VDROP = 3.3V + 0.3V = 3.6V to sustain 300mA output. At lower inputs, output voltage drops proportionally; datasheet specifies dropout measured at 2% deviation from nominal, validated down to 3.6V under full load and 25°C ambient.
Can AP7331-33SNG-7 operate without an output capacitor?
No. The device requires a minimum 1μF ceramic capacitor between OUT and GND for stability and transient response. Omitting it causes oscillation and potential damage. The datasheet explicitly states "stable with low ESR, 1µF ceramic output capacitor" and provides layout guidance for placement adjacent to OUT/GND pins.
Is the EN pin 5V-tolerant when used with a 5V microcontroller GPIO?
No. EN pin absolute maximum rating is VIN + 0.3V, and VIN max is 7V - but logic thresholds are specified only up to VIN = 6V. Driving EN with 5V while VIN = 3.6V violates VEN ≤ VIN + 0.3V (i.e., ≤3.9V), risking latch-up. Use a resistive divider or level shifter if interfacing to 5V logic.
Does AP7331-33SNG-7 require a minimum load current to maintain regulation?
No. The datasheet confirms "no minimum load is required to keep the device stable" and states it remains regulated at zero load. This is enabled by internal biasing design and verified across –40°C to 85°C ambient, making it ideal for intermittent-duty IoT sensors.
AP7331-33SNG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- 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:
- U-DFN2020-6
AP7331-33SNG-7 FAQ
1.How can I place an order for AP7331-33SNG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7331-33SNG-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 AP7331-33SNG-7 reliable?
The price and inventory of AP7331-33SNG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7331-33SNG-7 is usually 5 days.
3.What payment methods are accepted for AP7331-33SNG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7331-33SNG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7331-33SNG-7?
AP7331-33SNG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7331-33SNG-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 AP7331-33SNG-7?
For technical support, including AP7331-33SNG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7331-33SNG-7 requirements.
6.How does Aetrix verify that AP7331-33SNG-7 is sourced from the original manufacturer or authorized distributors?
All AP7331-33SNG-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 AP7331-33SNG-7 meets industry standards.
7.What is the process for return or replacement of AP7331-33SNG-7?
All AP7331-33SNG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7331-33SNG-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 AP7331-33SNG-7 part is unused and in its original packaging.
Return procedure for AP7331-33SNG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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