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Diodes Incorporated AP7335A-33SN-7
- Part No.:
- AP7335A-33SN-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AP7335A-33SN-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,653
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Product details
Overview
AP7335A-33SN-7 from Diodes Incorporated is a 300mA, fixed 3.3V output low-dropout linear regulator with ±1% output voltage accuracy, 150mV dropout at full load, 35μA quiescent current, and 65dB PSRR at 1kHz-designed for battery-powered portable electronics requiring fast transient response and ultra-low standby power.
For engineers reviewing the AP7335A-33SN-7 datasheet, AP7335A-33SN-7 pinout, AP7335A-33SN-7 application, or AP7335A-33SN-7 equivalent, key selection criteria include dropout voltage under 300mA load, EN-pin logic thresholds (VIH ≥ 1.4V, VIL ≤ 0.4V), thermal shutdown threshold (+145°C), stability with 1μF ceramic output capacitor, and U-DFN2020-6 package footprint compatibility.
Technical Context
The AP7335A-33SN-7 integrates a PMOS pass element, band-gap reference, error amplifier, and protection circuitry (current limit, thermal shutdown) in a single-chip LDO architecture. Its fixed 3.3V output is trimmed during production to ±1% over –40°C to +85°C ambient.
It operates with input voltage range 4.3V to 6V, supports fast 220μs start-up after EN assertion, and maintains regulation without minimum load. The device achieves stable operation using only 1μF ceramic output capacitance with ESR > 15mΩ, enabled by internal compensation optimized for low-ESR capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over –40°C to +85°C - ensures precise rail generation for 3.3V logic and analog circuits. |
| Max Output Current | 300mA continuous - sufficient for microcontrollers, RF transceivers, and sensor interfaces in compact portable designs. |
| Dropout Voltage | 150mV at 300mA - enables operation from 4.3V input, critical for single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 35μA typical - minimizes battery drain in always-on or sleep-mode applications like Bluetooth headsets. |
| PSRR | 65dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding the LDO input. |
| Start-up Time | 220μs - supports rapid wake-up of peripherals in duty-cycled systems such as GSM baseband ICs. |
| Thermal Shutdown | +145°C with 15°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
AP7335A-33SN-7 is packaged in a 2.0mm × 2.0mm, 0.65mm pitch U-DFN2020-6 package with exposed thermal pad (pin 2). This thermally enhanced leadless package delivers θJA = 251°C/W on standard FR-4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 3) | Input voltage supply | Accepts 4.3–6V; requires ≥1μF MLCC bypass to GND close to pin for noise rejection and stability. |
| GND (Pin 2) | Power ground reference | Common return path for IN, OUT, and EN; connects to thermal pad for heat dissipation. |
| EN (Pin 1) | Enable control input | Active-high logic interface (VIH ≥ 1.4V); ties to IN if always-on operation is required. |
| OUT (Pin 4) | Regulated 3.3V output | Delivers up to 300mA; requires ≥1μF ceramic capacitor to GND for transient stability and PSRR optimization. |
| NC (Pins 5 & 6) | No connection | Unbonded terminals; must remain unconnected and unpopulated on PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ | 35μA quiescent current enables >1-year battery life in 10μA average-load IoT sensors. |
| Fast transient response | Stable 3.3V output during 0→300mA load steps with <20mV undershoot - suitable for DSP/GSM burst-mode loads. |
| Single-capacitor stability | Guaranteed stability with 1μF ceramic output capacitor (ESR >15mΩ), reducing BOM count and board area. |
| Integrated protection | Current limit (~650mA), short-circuit clamp (~160mA), and thermal shutdown prevent field failures in unregulated environments. |
| Green packaging | Halogen- and antimony-free, fully RoHS-compliant U-DFN2020-6 package with no intentionally added lead. |
Applications
| Smartphones | Bluetooth Headsets |
|---|---|
Use Scenario: Powering baseband processor I/O rails and audio codec during TDMA transmit bursts. IC Role / Device Role / Timing Role: Low-noise, fast-response LDO supplying 3.3V to GSM chipset with 12.5% duty cycle. Use Value: 220μs start-up and 65dB PSRR maintain signal integrity during RF transmission without voltage droop. |
Use Scenario: Regulating power to Bluetooth radio and MEMS microphone in compact ear-worn form factor. IC Role / Device Role / Timing Role: Always-on 3.3V supply with 35μA IQ enabling multi-week standby on coin-cell battery. Use Value: 150mV dropout allows direct use of 3.6V Li-ion cell throughout discharge curve without intermediate buck stage. |
| MP3/MP4 Players | Battery Chargers (USB-PD Auxiliary Rail) |
Use Scenario: Supplying NAND flash memory and DAC in portable media players with variable playback load. IC Role / Device Role / Timing Role: Load-transient-stable LDO delivering clean 3.3V to storage and audio subsystems. Use Value: Excellent load transient response (<20mV deviation at 300mA step) prevents data corruption during file access. |
Use Scenario: Generating 3.3V auxiliary rail for charger controller communication (I²C, status LEDs) from USB-PD input. IC Role / Device Role / Timing Role: Enable-controlled LDO providing isolated, low-noise power for system management logic. Use Value: EN pin allows synchronized power-up with main charging IC, reducing inrush and improving system-level sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-IQ, fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/TT (Microchip) | 250mA max output, 1.6μA IQ, SOT23-5 package, 600mV dropout at 250mA | Limited to lower current; better for ultra-low-power sensors but unsuitable for 300mA burst loads | Select when IQ < 2μA is mandatory and peak load ≤ 250mA |
| TLS850B2TE/V1 (Infineon) | 500mA output, 35μA IQ, AEC-Q100 qualified, 300mV dropout at 500mA, automotive-grade temp range | Designed for automotive body electronics; overqualified for consumer portables, higher cost | Select only for automotive applications requiring -40°C to +125°C operation and functional safety compliance |
Compared with MCP1700T-3302E/TT and TLS850B2TE/V1, the AP7335A-33SN-7 uniquely balances 300mA capability, 35μA IQ, 150mV dropout, and U-DFN2020-6 footprint-making it optimal for space-constrained, battery-powered consumer devices where performance and size are co-prioritized.
Availability
AP7335A-33SN-7 is available at Aetrix Electronics and suitable for smartphone baseband power, Bluetooth headset audio subsystems, MP3 player memory/DAC supplies, and USB-PD auxiliary rails requiring stable component supply, consistent parametric performance, and green RoHS-compliant packaging.
Supply support for AP7335A-33SN-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 computing markets.
The AP7335A belongs to Diodes' low-quiescent-current LDO family, engineered specifically for battery-powered portable electronics demanding fast transient response, minimal dropout, and robust protection in miniature packages.
FAQ
What is the minimum input voltage required for AP7335A-33SN-7 to regulate 3.3V at 300mA?
The minimum input voltage is 4.3V, defined as VIN(MIN) = VOUT + VDROPOUT = 3.3V + 150mV. Below this, the output voltage drops below regulation due to insufficient headroom across the PMOS pass element.
Can AP7335A-33SN-7 operate without an output capacitor?
No. A minimum 1μF ceramic output capacitor with ESR >15mΩ is required for stability and transient response. Omitting it causes oscillation and voltage overshoot during load steps, per Diodes' Application Note Section 7.
Is the EN pin internally pulled up or down?
The EN pin has no internal pull-up or pull-down. It must be actively driven to ≥1.4V for enable or ≤0.4V for shutdown. If unused, Diodes recommends tying EN directly to IN to ensure always-on operation.
How does thermal shutdown behave during sustained overload?
When junction temperature reaches +145°C, the output disables; it re-enables only after cooling to +130°C (15°C hysteresis). Under continuous overload, this causes on/off cycling to limit average power dissipation and prevent permanent damage.
AP7335A-33SN-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-DFN2020-6
AP7335A-33SN-7 FAQ
1.How can I place an order for AP7335A-33SN-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7335A-33SN-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 AP7335A-33SN-7 reliable?
The price and inventory of AP7335A-33SN-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7335A-33SN-7 is usually 5 days.
3.What payment methods are accepted for AP7335A-33SN-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7335A-33SN-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7335A-33SN-7?
AP7335A-33SN-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7335A-33SN-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 AP7335A-33SN-7?
For technical support, including AP7335A-33SN-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7335A-33SN-7 requirements.
6.How does Aetrix verify that AP7335A-33SN-7 is sourced from the original manufacturer or authorized distributors?
All AP7335A-33SN-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 AP7335A-33SN-7 meets industry standards.
7.What is the process for return or replacement of AP7335A-33SN-7?
All AP7335A-33SN-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7335A-33SN-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 AP7335A-33SN-7 part is unused and in its original packaging.
Return procedure for AP7335A-33SN-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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