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Diodes Incorporated AP7343D-17FS4-7B
- Part No.:
- AP7343D-17FS4-7B
- Manufacturer:
- Diodes Incorporated
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
AP7343D-17FS4-7B.pdf
- Description:
- IC REG LINEAR 1.7V 300MA 4DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,353
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Product details
Overview
AP7343D-17FS4-7B from Diodes Incorporated is a 300mA, 1.7V fixed-output low-dropout linear regulator in X2-DFN1010-4 (Type B) package, featuring ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), 35µA quiescent current, and integrated enable control. It delivers stable power to RF supplies and camera modules in space-constrained portable electronics.
For engineers reviewing the AP7343D-17FS4-7B datasheet, AP7343D-17FS4-7B pinout, AP7343D-17FS4-7B application, or AP7343D-17FS4-7B equivalent, key selection criteria include dropout voltage at 300mA (0.46V typ. for 1.7V output), thermal resistance (237°C/W J-A), EN logic thresholds (0.5V low / 1.3V high), and discharge functionality enabled by the "D" suffix.
Technical Context
The AP7343D-17FS4-7B employs a CMOS-based LDO architecture with internal voltage reference, error amplifier, current limit, and thermal shutdown circuitry. Its enable input (EN) provides precise on/off control, while the built-in auto-discharge path (enabled by "D" suffix) actively pulls VOUT to GND during shutdown, eliminating residual voltage hold-up.
This device operates across 1.7V–5.25V input range and maintains regulation down to 1.7V output with ≤0.46V typical dropout at 300mA. It achieves 75dB ripple rejection at 1kHz and sustains ±30ppm/°C output voltage temperature coefficient over –40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.7V ±1% - ensures precise biasing for 1.8V-domain logic rails without external feedback. |
| Max Output Current | 300mA - supports moderate-power RF transceivers and image sensor analog blocks. |
| PSRR @ 1kHz | 75dB - suppresses switching noise from adjacent DC-DC converters feeding noisy system rails. |
| Output Noise | 60µVrms (10Hz–100kHz) - minimizes phase jitter in clock-sensitive analog circuits like ADCs and RF synthesizers. |
| Quiescent Current | 35µA - extends battery life in always-on sensor nodes and standby modes of portable devices. |
| Dropout Voltage | 0.46V typ. at 300mA - enables operation from single-cell Li-ion (3.0–4.2V) or dual-cell alkaline (2.4–3.2V) sources. |
| Enable Thresholds | VIL = 0.5V max, VIH = 1.3V min - compatible with 1.8V and 3.3V GPIOs without level-shifting. |
Pinout & Package
X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.4mm pitch, exposed thermal pad (EP) - optimized for ultra-dense PCB layouts and thermal performance in handheld form factors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN1 (VOUT) | Regulated Power Output | Delivers clean 1.7V supply; requires local 1µF ceramic capacitor placed adjacent to minimize impedance. |
| PIN2 (GND) | Analog & Power Ground Reference | Primary return path for load current and internal circuitry; must connect directly to low-impedance ground plane. |
| PIN3 (EN) | Active-High Enable Control | Drives high ≥1.3V to activate regulator; pulled low ≤0.5V to enter shutdown with auto-discharge active. |
| PIN4 (VIN) | Input Power Supply | Accepts 1.7–5.25V input; requires ≥0.47µF ceramic decoupling capacitor placed within 2mm of pin. |
| EP (Exposed Pad) | Thermal Dissipation Path | Not electrically connected; must be soldered to large copper area tied to GND for optimal θJA = 237°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-Discharge Function | Integrated N-channel MOSFET discharges VOUT to GND during shutdown (EN = low), preventing unintended wake-up or latch-up in multi-rail systems. |
| Ultra-Low Noise Output | 60µVrms broadband noise enables direct powering of RF front-ends and precision analog signal chains without additional filtering. |
| High PSRR at Low Frequencies | 75dB rejection at 1kHz allows co-location with noisy buck converters without compromising signal integrity. |
| Wide Input Range | 1.7V–5.25V operation supports single-cell Li-ion, USB-powered, and legacy 3.3V/5V system rails. |
| Thermal Protection | 150°C junction shutdown with 20°C hysteresis prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| RF Power Amplifier Bias | CMOS Image Sensor Core Supply |
|---|---|
Use Scenario: Providing clean, low-noise bias voltage to GaAs or SiGe RF power amplifiers in LTE/Wi-Fi front-ends. IC Role / Device Role / Timing Role: Primary LDO delivering stable 1.7V core supply with minimal phase noise contribution to transmit chain. Use Value: 60µVrms noise and 75dB PSRR prevent AM-to-PM conversion and EVM degradation under dynamic PA load conditions. |
Use Scenario: Powering analog pixel array and column ADC circuitry in smartphone camera modules. IC Role / Device Role / Timing Role: Dedicated low-noise LDO supplying 1.7V to image sensor analog core, isolated from digital switching noise. Use Value: ±1% accuracy and <±30ppm/°C drift ensure consistent pixel response across temperature, reducing calibration overhead. |
| Portable Media Player Audio Codec | Low-Power IoT Sensor Node MCU Core |
Use Scenario: Delivering regulated 1.7V to stereo audio codec's analog supply rail in Bluetooth headphones. IC Role / Device Role / Timing Role: Noise-suppressing LDO decoupling DAC/ADC sections from shared system power domain. Use Value: 35µA quiescent current extends playback time; 0.46V dropout enables use with partially discharged 3.0V battery. |
Use Scenario: Supplying 1.7V core voltage to ARM Cortex-M0+ microcontroller in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Enable-controlled LDO providing MCU VDD with fast turn-on (<20µs) and auto-discharge for deep-sleep state transitions. Use Value: EN-compatible logic thresholds simplify GPIO interfacing; discharge function eliminates need for external bleed resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1702E/MB | 250mA max output, no enable pin, 65dB PSRR @ 1kHz, 30µA IQ, SOT-23 package | Lacks EN control and auto-discharge; lower current and PSRR limit use in RF or high-transient apps | Select when board space permits SOT-23 and enable/discharge are not required. |
| Torex XC6210B172MR-G | 300mA, 1.7V fixed, 70dB PSRR @ 1kHz, 45µA IQ, no discharge, USP-4 package (1.2×1.2mm) | Slightly higher noise (75µVrms), no discharge path, larger footprint than X2-DFN1010-4 | Prefer for cost-sensitive designs where discharge is unnecessary and 0.2mm size penalty is acceptable. |
Compared with MCP1700T-1702E/MB and XC6210B172MR-G, the AP7343D-17FS4-7B uniquely combines 300mA capability, 75dB PSRR, 60µVrms noise, and integrated auto-discharge in a 1.0mm² footprint-making it optimal for compact, noise-sensitive, and enable-driven portable systems.
Availability
AP7343D-17FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier biasing, CMOS image sensor core supply, portable media player audio codecs, and low-power IoT sensor node MCU core applications requiring stable component supply, automotive-grade traceability, and long-term production continuity.
Supply support for AP7343D-17FS4-7B 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity solutions.
The AP7343 series targets portable and battery-powered applications demanding ultra-low noise, high PSRR, and minimal quiescent current-designed specifically for smartphones, tablets, and wireless communication equipment.
FAQ
What is the purpose of the "D" suffix in AP7343D-17FS4-7B?
The "D" denotes integrated auto-discharge functionality: when EN is pulled low, an internal N-channel MOSFET (RON ≈ 30Ω) actively discharges the VOUT capacitor to GND. This eliminates residual voltage that could cause unintended wake-up or latch-up in multi-rail systems, removing the need for external discharge resistors.
Can AP7343D-17FS4-7B operate with input voltage below 1.7V?
No. The absolute minimum input voltage is 1.7V per datasheet Absolute Maximum Ratings and Recommended Operating Conditions. Operation below this threshold risks loss of regulation, increased dropout, or failure to start. For sub-1.7V inputs, consider alternative LDOs with lower VIN min specification.
How does the X2-DFN1010-4 (Type B) package affect thermal performance?
The X2-DFN1010-4 (Type B) package has RθJA = 237°C/W on JEDEC High-K board. Effective thermal management requires soldering the exposed pad (EP) to a ≥40mm² copper area connected to GND. Without proper EP grounding, junction temperature rise exceeds safe limits at >100mA load.
Is AP7343D-17FS4-7B suitable for automotive applications?
The standard AP7343D-17FS4-7B is not AEC-Q100 qualified. Diodes offers the AP7343Q variant (separate datasheet) for automotive use, with extended temperature range (–40°C to +125°C), enhanced ESD protection (>2kV HBM), and PPAP-capable manufacturing. Use AP7343Q for infotainment, ADAS, or body electronics.
AP7343D-17FS4-7B 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):
- 5.25V
- Voltage - Output (Min/Fixed):
- 1.7V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.39V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN1010-4
AP7343D-17FS4-7B FAQ
1.How can I place an order for AP7343D-17FS4-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7343D-17FS4-7B 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 AP7343D-17FS4-7B reliable?
The price and inventory of AP7343D-17FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343D-17FS4-7B is usually 5 days.
3.What payment methods are accepted for AP7343D-17FS4-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-17FS4-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7343D-17FS4-7B?
AP7343D-17FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7343D-17FS4-7B 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 AP7343D-17FS4-7B?
For technical support, including AP7343D-17FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-17FS4-7B requirements.
6.How does Aetrix verify that AP7343D-17FS4-7B is sourced from the original manufacturer or authorized distributors?
All AP7343D-17FS4-7B 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 AP7343D-17FS4-7B meets industry standards.
7.What is the process for return or replacement of AP7343D-17FS4-7B?
All AP7343D-17FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-17FS4-7B, 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 AP7343D-17FS4-7B part is unused and in its original packaging.
Return procedure for AP7343D-17FS4-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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