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Diodes Incorporated AP7353D-18FS4-7
- Part No.:
- AP7353D-18FS4-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7353D-18FS4-7.pdf
- Description:
- LDO CMOS LOWCURR X2-DFN1010-4 (T
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
AP7353D-18FS4-7 from Diodes Incorporated is a 250mA low-dropout linear regulator with fixed 1.8V output, high PSRR (90dB at 1kHz), ultra-low output noise (10µVrms), and 18µA typical quiescent current. It features an enable input, thermal shutdown, short-circuit protection, and is optimized for RF supply rails and battery-powered wearable systems requiring stable, clean voltage under fast load transients.
For engineers reviewing the AP7353D-18FS4-7 datasheet, AP7353D-18FS4-7 pinout, AP7353D-18FS4-7 application, or AP7353D-18FS4-7 equivalent, key selection criteria include dropout voltage at 250mA (130–240mV), EN logic thresholds (0.4V low / 1.2V high), thermal resistance (237°C/W), and compatibility with 1µF ceramic output capacitors in space-constrained layouts.
Technical Context
The AP7353D-18FS4-7 uses a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its discharge function actively pulls the output to ground when disabled, preventing residual voltage hold-up in sequencing-sensitive systems.
It operates across 2.0V–5.5V input range and delivers ±1% output accuracy over –40°C to +85°C ambient. The X2-DFN1010-4 (Type B) package supports high-density PCB placement and requires minimal external components-only 1µF input and output ceramic capacitors-for full stability and transient performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% - ensures precise biasing for 1.8V I/O domains and low-voltage logic without external feedback. |
| Max Output Current | 250mA - sufficient to power baseband processors, RF transceivers, or sensor signal chains in portable devices. |
| PSRR | 90dB at 1kHz (10mA load) - suppresses switching noise from adjacent DC/DC converters feeding shared input rails. |
| Output Noise | 10µVrms (10Hz–100kHz) - preserves SNR in analog front-ends, ADC references, and RF VCO supplies. |
| Quiescent Current | 18µA typical - extends battery life in always-on wearables and IoT edge nodes during sleep mode. |
| Dropout Voltage | 130–240mV at 250mA - enables operation down to 2.0V input while maintaining regulation for 1.8V output. |
| Enable Thresholds | VEN(H) ≥1.2V, VEN(L) ≤0.4V - compatible with standard GPIOs and allows direct connection to microcontroller wake signals. |
Pinout & Package
X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.65mm pitch, exposed thermal pad (EP), RoHS-compliant NiPdAu finish, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Regulated Power Output | Delivers 1.8V to load; must be decoupled with ≥1µF ceramic capacitor placed adjacent to pin and GND. |
| 2: GND | Ground Reference | Primary return path for load current and internal circuitry; connects directly to PCB ground plane for low-impedance return. |
| 3: EN | Enable Control Input | Active-high logic input; drives regulator ON/OFF; must not float; internal pull-down not provided. |
| 4: IN | Power Input | Accepts 2.0–5.5V input; requires ≥1µF ceramic capacitor between IN and GND to suppress supply ripple and transient droop. |
| EP | Exposed Thermal Pad | Not electrically functional as GND; soldered to large copper pour tied to system GND for thermal dissipation (θJA = 237°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Output Discharge | 35Ω on-resistance discharges VOUT to GND within microseconds upon disable - eliminates need for external bleed resistor in power sequencing. |
| Ultra-Low Noise Performance | 10µVrms broadband noise - meets stringent requirements for RF synthesizers, precision ADCs, and audio codecs without additional filtering. |
| High PSRR at High Frequency | 70dB at 10kHz (250mA load) - maintains clean output even when powered from noisy switcher outputs with 100kHz+ ripple content. |
| Fast Load Transient Response | <20µs recovery time for 1mA ↔ 250mA step - prevents brownout during burst-mode processor activity in handheld devices. |
| Stable with Minimal Capacitance | Works with 0.7µF minimum COUT (X7R/X5R) - reduces BOM count and board area vs. legacy LDOs requiring ≥10µF tantalum. |
Applications
| RF Power Amplifier Bias | Wearable Sensor Hub Supply |
|---|---|
|
Use Scenario: Providing clean 1.8V bias to GaAs or SiGe RF power amplifiers in Bluetooth/Wi-Fi modules. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO delivering stable VPA independent of noisy DC/DC converter output ripple. Use Value: Prevents AM-to-PM distortion and EVM degradation by suppressing 1–10kHz switching artifacts from upstream converters. |
Use Scenario: Powering multi-axis IMU, optical heart-rate sensor, and BLE SoC in fitness trackers. IC Role / Device Role / Timing Role: Primary 1.8V rail generator with enable control synchronized to motion-detection wake events. Use Value: 18µA quiescent current extends battery runtime beyond 7 days; discharge function ensures rapid reset between sensor sampling cycles. |
| Camera Module Core Logic | Portable Media Player Audio Codec |
|
Use Scenario: Supplying 1.8V core voltage to image signal processors (ISPs) and MIPI interface logic in smartphone cameras. IC Role / Device Role / Timing Role: Low-dropout regulator handling dynamic current surges during auto-focus actuation and frame capture bursts. Use Value: 20µs load transient response prevents ISP clock jitter or MIPI lane synchronization loss during high-current pixel readout. |
Use Scenario: Delivering ultra-low-noise 1.8V to stereo audio DACs and headphone amplifiers in MP3 players. IC Role / Device Role / Timing Role: Dedicated analog supply rail decoupled from digital subsystems to minimize THD+N. Use Value: 10µVrms noise floor enables >100dB SNR in 24-bit audio playback without post-regulation LC filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B182MR-G | Same 1.8V/250mA rating, but no enable pin or discharge function; PSRR 70dB @ 1kHz; 25µA IQ. | Lacks sequencing control and output discharge - unsuitable for multi-rail power-up/down coordination. | Select only if enable/discharge are unused and cost is primary constraint. |
| Richtek RT9013-18GB | 1.8V/300mA, 22µA IQ, 85dB PSRR @ 1kHz, no discharge; requires 2.2µF min COUT. | Higher current headroom but larger output cap requirement increases footprint and cost. | Prefer when >250mA peak load is expected and board area permits larger capacitor. |
Compared with XC6210B182MR-G and RT9013-18GB, the AP7353D-18FS4-7 uniquely combines discharge capability, lowest noise, and smallest required output capacitance-making it optimal for compact, sequenced, noise-sensitive portable designs.
Availability
AP7353D-18FS4-7 is available at Aetrix Electronics and suitable for RF power amplifier biasing, wearable sensor hub power management, camera module core logic, and portable media player audio codec supply requiring stable component supply, tight voltage tolerance, and low-noise operation.
Supply support for AP7353D-18FS4-7 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 power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP7353 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-critical applications in portable communications equipment where battery efficiency and signal purity are paramount.
FAQ
What is the maximum allowable input voltage for AP7353D-18FS4-7?
The absolute maximum input voltage is 6.0V, but recommended operating range is 2.0V to 5.5V. Exceeding 5.5V risks permanent damage per Absolute Maximum Ratings. For 1.8V output, minimum input is 2.0V; dropout voltage rises with load - at 250mA, VIN must be ≥1.93V to maintain regulation.
Does AP7353D-18FS4-7 require an external discharge resistor?
No. The "D" suffix denotes integrated output discharge functionality with 35Ω on-resistance. When EN is pulled low, the internal NMOS actively pulls OUT to GND, eliminating need for external bleed resistors and reducing BOM count and PCB area.
Can AP7353D-18FS4-7 operate with a 0.47µF output capacitor?
No. Minimum effective COUT is 0.7µF (accounting for temperature, DC bias, and tolerance derating). A 0.47µF capacitor fails to meet stability requirements and may cause oscillation or poor transient response. Use ≥1µF X7R/X5R ceramic placed adjacent to OUT and GND pins.
How does thermal performance differ between X1-WLB0707-4 and X2-DFN1010-4 packages?
X1-WLB0707-4 has θJA = 150°C/W; X2-DFN1010-4 (used in AP7353D-18FS4-7) has θJA = 237°C/W. Though smaller, the DFN package relies more heavily on PCB copper area for heat spreading. To match X1's thermal performance, the DFN's exposed pad must connect to ≥100mm² of 2oz copper tied to GND.
AP7353D-18FS4-7 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.24V @ 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-18FS4-7 FAQ
1.How can I place an order for AP7353D-18FS4-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7353D-18FS4-7 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-18FS4-7 reliable?
The price and inventory of AP7353D-18FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7353D-18FS4-7 is usually 5 days.
3.What payment methods are accepted for AP7353D-18FS4-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7353D-18FS4-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7353D-18FS4-7?
AP7353D-18FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7353D-18FS4-7 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-18FS4-7?
For technical support, including AP7353D-18FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7353D-18FS4-7 requirements.
6.How does Aetrix verify that AP7353D-18FS4-7 is sourced from the original manufacturer or authorized distributors?
All AP7353D-18FS4-7 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-18FS4-7 meets industry standards.
7.What is the process for return or replacement of AP7353D-18FS4-7?
All AP7353D-18FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7353D-18FS4-7, 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-18FS4-7 part is unused and in its original packaging.
Return procedure for AP7353D-18FS4-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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