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Diodes Incorporated AP7353D-31FS4-7
- Part No.:
- AP7353D-31FS4-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7353D-31FS4-7.pdf
- Description:
- LDO CMOS LOWCURR X2-DFN1010-4 (T
- Quantity:
- Payment:
- Shipping:
Inventory:4,815
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Product details
Overview
AP7353D-31FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 3.1V output, high PSRR (90dB at 1kHz), ultra-low output noise (10µVrms), and 18µA typical quiescent current. Packaged in the X2-DFN1010-4 (Type B) 1.0mm × 1.0mm wettable flank package, it delivers stable power for RF supply rails and portable media subsystems where noise sensitivity and battery life are critical.
For engineers reviewing the AP7353D-31FS4-7 datasheet, AP7353D-31FS4-7 pinout, AP7353D-31FS4-7 application, or AP7353D-31FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (max 150mV @ 3.1V), enable threshold compatibility (EN high ≥1.2V), thermal resistance (θJA = 237°C/W), and discharge functionality for fast output discharge during shutdown.
Technical Context
The AP7353D integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown protection. Its architecture supports fast load transient response (<20µs recovery for 1mA→250mA step) and maintains ±1% output accuracy across -40°C to +85°C ambient temperature.
Unlike non-discharge variants, the 'D' suffix denotes an integrated N-channel discharge FET (RON = 35Ω) that actively pulls the output to GND when EN is low-eliminating external discharge resistors and reducing residual voltage hold-up time in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.1V ±1% - ensures precise biasing for 3.3V-tolerant logic and analog circuits without external feedback. |
| Max Output Current | 250mA - sufficient to power multiple low-power ICs (e.g., RF transceivers, camera sensors) from a single LDO. |
| PSRR | 90dB at 1kHz, 70dB at 10kHz - suppresses switching noise from upstream DC/DC converters feeding sensitive RF or ADC sections. |
| Output Noise | 10µVrms (10Hz–100kHz) - minimizes phase noise in VCOs and jitter in high-speed serial interfaces. |
| Quiescent Current | 18µA typical - extends battery runtime in always-on wearable sensors and Bluetooth LE peripherals. |
| Dropout Voltage | 147mV max @ 250mA, 3.1V - enables operation from 3.3V rail with >180mV headroom, supporting brown-out resilience. |
| Enable Threshold | VEN(H) ≥1.2V, VEN(L) ≤0.4V - compatible with 1.8V/3.3V GPIOs without level-shifting. |
Pinout & Package
Packaged in the X2-DFN1010-4 (Type B) 1.0mm × 1.0mm wettable flank package with exposed thermal pad (EP), this device supports automated optical inspection (AOI) and offers θJA = 237°C/W on standard 2-layer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 4) | Power Input | Accepts 2.0V–5.5V input; requires ≥1µF ceramic capacitor placed adjacent to minimize input impedance and suppress ripple. |
| EN (Pin 3) | Enable Control | Active-high logic input; must be driven to avoid floating; enables fast shutdown with built-in discharge FET. |
| GND (Pin 2) | Ground Reference | Primary return path for input/output currents; connects to PCB ground plane for low-impedance thermal and electrical path. |
| OUT (Pin 1) | Regulated Output | Delivers 3.1V ±1%; requires ≥1µF low-ESR ceramic capacitor within 2mm of pin for stability and transient response. |
| EP (Exposed Pad) | Thermal & Electrical Ground | Must be soldered to large copper area tied to GND; improves thermal dissipation and reduces noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Discharge FET | 35Ω RON actively discharges output to GND during shutdown-reducing residual voltage hold-up time to <100µs and eliminating need for external resistor. |
| Ultra-Low Noise | 10µVrms over 10Hz–100kHz band enables clean power for RF front-ends, PLLs, and high-resolution ADCs without additional filtering. |
| High PSRR at High Frequency | 70dB rejection at 10kHz ensures immunity to noise from 1MHz+ DC/DC converters commonly used in portable system power trees. |
| Low Dropout at Full Load | 147mV max dropout at 250mA allows operation from 3.3V rail down to ~3.15V input-critical for Li-ion battery discharge profiles. |
| Wettable Flank Package | X2-DFN1010-4 enables reliable AOI inspection and robust solder joint formation-reducing field failure risk in high-volume consumer manufacturing. |
Applications
| RF Power Amplifier Bias | Camera Sensor Core Supply |
|---|---|
|
Use Scenario: Providing clean, stable 3.1V bias to GaAs pHEMT power amplifiers in LTE/5G mobile front-ends. IC Role / Device Role / Timing Role: Low-noise LDO delivering regulated voltage with minimal phase noise contribution to transmit signal integrity. Use Value: 10µVrms noise and 90dB PSRR prevent AM-to-PM conversion and maintain EVM <2.5% under dynamic load conditions. |
Use Scenario: Powering CIS image sensor core logic and analog pixel array in smartphone rear cameras. IC Role / Device Role / Timing Role: Primary voltage regulator for sensor's digital and analog domains, synchronized to frame readout timing. Use Value: ±1% output accuracy ensures consistent ADC reference scaling; fast load transient response (<20µs) prevents frame corruption during exposure bursts. |
| Bluetooth LE Audio Codec Supply | Wearable Heart Rate Monitor Analog Front-End |
|
Use Scenario: Supplying 3.1V to low-latency audio codecs in true wireless stereo earbuds with 200mAh battery. IC Role / Device Role / Timing Role: Always-on LDO maintaining voltage during deep-sleep wake cycles and audio streaming bursts. Use Value: 18µA quiescent current extends standby time to >120 hours; discharge FET eliminates leakage path during sleep mode. |
Use Scenario: Powering photodiode transimpedance amplifier and 16-bit sigma-delta ADC in optical PPG sensors. IC Role / Device Role / Timing Role: Precision analog supply decoupled from noisy digital subsystems via high PSRR and low noise. Use Value: 70dB PSRR at 10kHz rejects switching noise from MCU clock domain; ±30ppm/°C tempco ensures gain stability across body temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B312MR-G | Same 3.1V output, 200mA rating, but no discharge FET; PSRR 75dB @ 1kHz; 25µA IQ | Lacks active discharge-requires external resistor for fast turn-off; higher noise (25µVrms) limits RF use. | Select if discharge not required and cost sensitivity outweighs noise/PSRR needs. |
| Richtek RT9013-31P5 | 3.1V output, 300mA rating, 22µA IQ, no discharge; PSRR 85dB @ 1kHz; dropout 160mV @ 250mA | Higher dropout limits usable input range; no discharge function increases board space and leakage risk. | Choose only when higher current margin is mandatory and thermal headroom permits higher dropout. |
Compared with XC6210B312MR-G and RT9013-31P5, the AP7353D-31FS4-7 uniquely combines discharge capability, industry-leading 10µVrms noise, and 90dB PSRR-making it optimal for RF and high-precision analog systems where residual voltage and spectral purity are design-critical.
Availability
AP7353D-31FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor core supply, Bluetooth LE audio codec supply, and wearable heart rate monitor analog front-end applications requiring stable component supply, long-term lifecycle support, and automotive-grade traceability options.
Supply support for AP7353D-31FS4-7 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing facilities certified to IATF 16949.
The AP7353 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for noise-sensitive portable and wireless applications demanding ultra-low quiescent current, fast transient response, and integrated discharge functionality.
FAQ
What is the purpose of the exposed pad (EP) on the AP7353D-31FS4-7?
The exposed pad serves dual thermal and electrical functions: it must be soldered to a large PCB copper area connected to GND to lower junction-to-ambient thermal resistance (θJA = 237°C/W) and reduce high-frequency noise coupling. Leaving it unconnected degrades thermal performance by >40% and increases output ripple.
Can the AP7353D-31FS4-7 operate with input voltage below 2.0V?
No. The absolute minimum input voltage is 2.0V per the Recommended Operating Conditions table. Operation below this violates the CMOS process operating window and causes output regulation failure, increased dropout, and potential thermal runaway at full load. For sub-2.0V systems, consider the AP7361 series.
How does the discharge FET affect PCB layout compared to non-discharge LDOs?
The integrated 35Ω discharge FET eliminates the need for an external 10kΩ–100kΩ pull-down resistor between OUT and GND, freeing up 1–2 mm² of board space and removing a potential source of leakage current (typically 30–100µA). Layout must still ensure low-inductance GND connection to EP and OUT pins to maximize discharge speed.
Is AP7353D-31FS4-7 qualified for automotive applications?
Standard AP7353D-31FS4-7 is not AEC-Q100 qualified. However, Diodes offers automotive-grade versions (e.g., AP7353D-31FS4-7Q) with PPAP documentation, extended temperature testing (-40°C to +125°C), and IATF 16949 manufacturing certification-available upon request for infotainment, ADAS, and body electronics designs.
AP7353D-31FS4-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.15V @ 250mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 27 µA
- Current - Supply (Max):
- -
- PSRR:
- 90dB ~ 70dB (100Hz ~ 10kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4 (Type B)
AP7353D-31FS4-7 FAQ
1.How can I place an order for AP7353D-31FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7353D-31FS4-7 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 AP7353D-31FS4-7 reliable?
The price and inventory of AP7353D-31FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353D-31FS4-7 is usually 5 days.
3.What payment methods are accepted for AP7353D-31FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353D-31FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7353D-31FS4-7?
AP7353D-31FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7353D-31FS4-7 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 AP7353D-31FS4-7?
For technical support, including AP7353D-31FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353D-31FS4-7 requirements.
6.How does Aetrix verify that AP7353D-31FS4-7 is sourced from the original manufacturer or authorized distributors?
All AP7353D-31FS4-7 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 AP7353D-31FS4-7 meets industry standards.
7.What is the process for return or replacement of AP7353D-31FS4-7?
All AP7353D-31FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353D-31FS4-7, 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 AP7353D-31FS4-7 part is unused and in its original packaging.
Return procedure for AP7353D-31FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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