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Diodes Incorporated AP7333-33SRG-7
- Part No.:
- AP7333-33SRG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7333-33SRG-7.pdf
- Description:
- IC REG LIN 3.3V 300MA SOT23R-3
- Quantity:
- Payment:
- Shipping:
Inventory:27,832
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Product details
Overview
AP7333-33SRG-7 from Diodes Incorporated is a 300mA fixed-output (3.3V) low-dropout linear regulator in SOT23R package, featuring 65µA quiescent current, 300mV dropout at full load, 65dB PSRR at 100Hz, and stable operation with 1µF ceramic output capacitor. It serves as a power management IC for battery-powered portable electronics requiring fast transient response and ultra-low standby power.
For engineers reviewing the AP7333-33SRG-7 datasheet, AP7333-33SRG-7 pinout, AP7333-33SRG-7 application, or AP7333-33SRG-7 equivalent, key selection criteria include dropout voltage under 300mA load, thermal shutdown threshold (140°C), current limit (400–600mA), stability with low-ESR capacitors, and SOT23R pin compatibility in space-constrained PCB layouts.
Technical Context
The AP7333-33SRG-7 integrates a PMOS pass element, bandgap reference, error amplifier, and protection circuitry (current limit, short-circuit, thermal shutdown) in a single monolithic IC. Its architecture enables fast start-up (80µs) and excellent load/line transient response without external compensation.
Designed for fixed-output regulation, it operates across 2V–6V input while maintaining ±2% output accuracy over –40°C to +85°C ambient. The SOT23R package uses reversed pinout (IN=Pin3, GND=Pin1, OUT=Pin2) versus standard SOT23, enabling layout flexibility in high-density designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% - ensures precise rail generation for 3.3V logic, USB peripherals, and RF front-end biasing. |
| Max Output Current | 300mA continuous - supports moderate-power microcontrollers, sensors, and wireless transceivers without thermal derating at TA ≤ 60°C. |
| Quiescent Current | 65µA typical at full load - minimizes battery drain in always-on monitoring circuits and sleep-mode subsystems. |
| Dropout Voltage | 300mV typical at 300mA - enables regulation from 3.6V input down to 3.3V output, critical for single-cell Li-ion (3.0–4.2V) applications. |
| PSRR | 65dB at 100Hz - suppresses low-frequency ripple from switching DC/DC converters upstream, improving analog sensor or ADC reference stability. |
| Start-up Time | 80µs - allows rapid power sequencing in wake-from-sleep scenarios, reducing system latency in portable devices. |
| Thermal Shutdown | 140°C junction threshold with 15°C hysteresis - provides self-recovery protection during sustained overload or poor heatsinking. |
Pinout & Package
SOT23R package: 3-pin, RoHS-compliant, green molding compound, 230°C/W θJA on FR-4 PCB with minimum pad layout per AP02001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (GND) | Ground reference | Primary return path for internal bias and output current; must connect to low-impedance ground plane to ensure stability and EMI control. |
| Pin 2 (OUT) | Regulated output | Delivers stable 3.3V to load; requires ≥1µF X7R/X5R ceramic capacitor placed within 2mm of pin for transient response and stability. |
| Pin 3 (IN) | Input supply | Accepts 2–6V unregulated input; bypassed with ≥1µF ceramic capacitor close to pin to suppress high-frequency noise and supply glitches. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ with load | 65µA at 300mA - enables >1-year battery life in coin-cell-powered IoT sensors operating intermittently. |
| Fast transient response | Stable 0→300mA load step without overshoot/undershoot exceeding ±3% - supports GSM/TDMA baseband ICs with pulsed current demands. |
| Low-ESR capacitor support | Stable with 1µF ceramic (10–200mΩ ESR) - eliminates need for bulk electrolytic capacitors, saving board space and cost. |
| Integrated protection | Current limit (400–600mA), short-circuit clamp (100mA), and thermal shutdown (140°C) - removes need for external fault-handling circuitry. |
| No minimum load requirement | Regulates stably at 0mA output - simplifies design for systems with variable or intermittent loads like touch controllers or wake-on-event peripherals. |
Applications
| Wireless LAN Modules | XDSL Router Power Rails |
|---|---|
Use Scenario: Powering 2.4GHz/5GHz Wi-Fi SoC and RF front-end in compact M.2 or mini-PCIe modules. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying digital core and analog RF sections with fast transient response to burst traffic. Use Value: 80µs start-up enables rapid channel switching; 65dB PSRR prevents WLAN packet errors caused by DC/DC switching noise. | Use Scenario: Generating clean 3.3V supply for DSL PHY, Ethernet MAC, and USB interface in residential gateways. IC Role / Device Role / Timing Role: Post-regulator after wide-input buck converter, rejecting ripple and enabling compliance with DSL line-driver noise specs. Use Value: 300mV dropout allows efficient operation from 3.6V intermediate rail; ±2% accuracy ensures reliable USB enumeration and PHY lock. |
| Battery-Powered Keyboards | Notebook Subsystem Regulation |
Use Scenario: Supplying MCU, BLE radio, and key matrix scanner in ultra-thin wireless keyboards using CR2032 or AAA cells. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3V with ultra-low IQ to maximize shelf life and active usage time. Use Value: 65µA IQ extends CR2032 battery life beyond 2 years in typical usage; SOT23R footprint fits narrow edge-mount layouts. | Use Scenario: Providing dedicated 3.3V rail for embedded controller (EC), keyboard controller, and smart battery interface in notebooks. IC Role / Device Role / Timing Role: Isolated low-noise supply decoupled from noisy main CPU VRMs, ensuring EC firmware reliability during sleep/wake transitions. Use Value: Fast 80µs start-up synchronizes with chipset power-good signals; thermal shutdown prevents EC lockup during fan failure or thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | 250mA max output, 1.6µA IQ, SOT23-3 package (standard pinout: IN=1, GND=2, OUT=3) | Limited to lower-current peripherals; ultra-low IQ suits multi-year battery apps but lacks fast transient capability | Select when IQ < 2µA is mandatory and load ≤250mA; avoid if SOT23R pinout or 300mA burst current required |
| TPS7333QDBVRQ1 | 300mA, 170µA IQ, automotive-grade (-40°C to +125°C), same SOT23-3 pinout as AP7333-33SA | Higher IQ reduces battery life vs. AP7333; AEC-Q100 qualification adds cost and lead time for non-automotive use | Select only for automotive temperature range or qualification requirements; otherwise AP7333-33SRG-7 offers better IQ and cost for industrial/consumer designs |
Compared with MCP1700-3302E/TO and TPS7333QDBVRQ1, the AP7333-33SRG-7 uniquely balances 300mA capability, 65µA IQ, SOT23R layout flexibility, and fast transient response-making it optimal for space-constrained portable electronics where both efficiency and dynamic performance matter.
Availability
AP7333-33SRG-7 is available at Aetrix Electronics and suitable for wireless LAN modules, XDSL router power rails, and battery-powered keyboards requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for AP7333-33SRG-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-performance, energy-efficient components for consumer, computing, industrial, and communications markets.
The AP7333 belongs to Diodes' low-quiescent-current LDO family, designed specifically for portable and battery-operated equipment where extended runtime, small solution size, and robust transient behavior are essential.
FAQ
What is the correct pinout for AP7333-33SRG-7?
The AP7333-33SRG-7 uses the SOT23R package with reversed pin assignment: Pin 1 = GND, Pin 2 = OUT, Pin 3 = IN (top view). This differs from standard SOT23 (IN-GND-OUT), so PCB layout must follow Diodes' AP02001 recommended pad pattern to avoid functional failure.
Can AP7333-33SRG-7 operate with zero load current?
Yes. The AP7333-33SRG-7 remains stable and maintains regulation with no load (0mA output), as confirmed in the datasheet's Recommended Operating Conditions and Application Note sections. No minimum load resistor is required, simplifying designs for intermittent-use peripherals.
What output capacitor is required for stability?
A single 1µF X7R or X5R ceramic capacitor (10–200mΩ ESR) placed within 2mm of the OUT and GND pins ensures stability. Larger values (up to 4.7µF) improve transient response but are not required for basic operation per the datasheet's "Stable with low ESR, 1µF ceramic output capacitor" specification.
How does thermal shutdown behave under sustained overload?
At ~140°C junction temperature, the device disables output and cools; re-enabling occurs at ~125°C due to 15°C hysteresis. Under continuous overload, this causes controlled on/off cycling-limiting average power dissipation and preventing permanent damage, as verified in Absolute Maximum Ratings and Application Note sections.
AP7333-33SRG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT23R
AP7333-33SRG-7 FAQ
1.How can I place an order for AP7333-33SRG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7333-33SRG-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 AP7333-33SRG-7 reliable?
The price and inventory of AP7333-33SRG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7333-33SRG-7 is usually 5 days.
3.What payment methods are accepted for AP7333-33SRG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7333-33SRG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7333-33SRG-7?
AP7333-33SRG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7333-33SRG-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 AP7333-33SRG-7?
For technical support, including AP7333-33SRG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7333-33SRG-7 requirements.
6.How does Aetrix verify that AP7333-33SRG-7 is sourced from the original manufacturer or authorized distributors?
All AP7333-33SRG-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 AP7333-33SRG-7 meets industry standards.
7.What is the process for return or replacement of AP7333-33SRG-7?
All AP7333-33SRG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7333-33SRG-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 AP7333-33SRG-7 part is unused and in its original packaging.
Return procedure for AP7333-33SRG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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