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Diodes Incorporated AP7343Q-185FDZW-7
- Part No.:
- AP7343Q-185FDZW-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
AP7343Q-185FDZW-7.pdf
- Description:
- LDO CMOS LOWCURR W-DFN2020-6 T&R
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
AP7343Q-185FDZW-7 from Diodes Incorporated is an automotive-grade 300mA low-dropout linear regulator with fixed 1.85V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current - designed for noise-sensitive power rails in ADAS camera modules and infotainment RF supplies.
For engineers reviewing the AP7343Q-185FDZW-7 datasheet, AP7343Q-185FDZW-7 pinout, AP7343Q-185FDZW-7 application, or AP7343Q-185FDZW-7 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, W-DFN2020-6 (SWP) Type A1 thermal performance (θJA = 54°C/W), enable-controlled shutdown, and absence of output discharge functionality.
Technical Context
The AP7343Q-185FDZW-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown protection. It operates across 1.7V–5.25V input range and delivers stable 1.85V output up to 300mA with dropout as low as 0.35V at 300mA (for VOUT = 1.85V).
Its enable input (EN) accepts logic-level control (VIL ≤ 0.5V, VIH ≥ 1.3V), and the device features no internal output discharge path - confirmed by part suffix "Q" (non-discharge variant) and functional block diagram distinction from AP7343DQ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.85V ±1% - ensures tight regulation for 1.8V I/O domain logic without external feedback. |
| Max Output Current | 300mA - supports dual-core microcontrollers or image sensor biasing in compact automotive modules. |
| PSRR | 75dB at 1kHz - suppresses switching noise from upstream DC/DC converters in mixed-signal systems. |
| Output Noise | 60µVrms (10Hz–100kHz) - minimizes phase jitter in RF PLLs and ADC reference supplies. |
| Quiescent Current | 35µA - enables always-on operation in vehicle wake-up circuits without battery drain penalty. |
| Operating Temp | −40°C to +125°C - validated for under-hood and cabin-mounted ADAS ECU environments. |
| Dropout Voltage | 0.35V typical at 300mA - allows operation from 2.2V input (e.g., degraded 12V rail via pre-regulator). |
Pinout & Package
AP7343Q-185FDZW-7 is packaged in W-DFN2020-6 (SWP) Type A1 - a 2.0mm × 2.0mm, 0.65mm height wettable flank package with exposed thermal pad (EP), optimized for high-density automotive PCBs and automated optical inspection (AOI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main power input; requires local 0.47µF ceramic decoupling placed within 2mm of pin. |
| 2 & 5 | NC | No-connect terminals; recommended to tie to GND for enhanced thermal conduction and EMI shielding. |
| 3 | GND | Analog/digital ground reference; must connect directly to solid ground plane beneath EP. |
| 4 | VOUT | Regulated 1.85V output; routed with low-inductance trace to load, adjacent to 1µF ceramic capacitor. |
| 6 | EN | Active-high enable; drives regulator ON when ≥1.3V, OFF when ≤0.5V - no pull-up required if permanently enabled. |
| EP | Exposed Pad | Thermal interface only; must be soldered to ≥100mm² copper pour connected to GND for θJA = 54°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C junction operation with PPAP documentation support - meets automotive safety-critical supply requirements. |
| Ultra-low output noise | 60µVrms over 10Hz–100kHz band - preserves SNR in analog front-ends of radar receivers and camera ISPs. |
| High PSRR at low frequency | 75dB at 1kHz - rejects ripple from buck converter switching frequencies and their harmonics. |
| Low quiescent current | 35µA typical - extends battery life in always-on telematics and gateway modules during sleep mode. |
| No output discharge | Eliminates reverse current path on shutdown - prevents unintended discharge of downstream capacitance in multi-rail systems. |
Applications
| Infotainment Power Supplies | Automotive RF Supplies |
|---|---|
|
Use Scenario: Powering audio DSP cores and display interface ICs in head-unit mainboards. IC Role / Device Role / Timing Role: Primary 1.85V LDO for low-noise digital I/O domain, decoupled from noisy 3.3V system rail. Use Value: Prevents audible artifacts and display flicker by suppressing 100kHz–1MHz switching noise from adjacent DC/DC converters. |
Use Scenario: Biasing VCOs and LNAs in 5G-V2X communication modules. IC Role / Device Role / Timing Role: Clean 1.85V supply for RF synthesizer PLLs requiring sub-100fs integrated jitter. Use Value: Maintains EVM < 3% at 5.9GHz by limiting supply-induced phase noise contribution to < −160dBc/Hz. |
| Cameras | Automotive POL in ADAS |
|
Use Scenario: Supplying image signal processors (ISPs) and rolling-shutter CMOS sensors in surround-view systems. IC Role / Device Role / Timing Role: Point-of-load regulator delivering stable 1.85V to sensor analog front-end and ADC reference buffers. Use Value: Reduces fixed-pattern noise (FPN) by limiting supply-induced gain variation to < 0.05% across temperature. |
Use Scenario: Providing core voltage to vision-processing SoCs (e.g., NVIDIA Orin, TI TDA4) in forward collision warning ECUs. IC Role / Device Role / Timing Role: Secondary LDO post-regulating 3.3V rail to 1.85V for memory I/O and PCIe SerDes termination. Use Value: Enables < 10ns timing margin compliance for DDR4-3200 interfaces under transient load steps up to 200mA/µs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7343Q-185FDUW-7 | Same electrical specs, but W-DFN2020-6 (SWP) Type UXD package - 53.3°C/W θJA, different pin 2/5 NC layout. | Suitable for designs requiring slightly better thermal performance and compatibility with UXD footprint standards. | Select when board layout uses UXD land pattern or thermal budget demands <54°C/W θJA. |
| TLD1120FVQ-TP | Infineon automotive LDO: 1.85V, 300mA, ±2% accuracy, 65dB PSRR @1kHz, 120µVrms noise, 50µA IQ. | Lacks wettable flank packaging; higher noise limits use in ultra-low-jitter RF chains. | Choose for cost-sensitive non-RF ADAS modules where 120µVrms noise is acceptable and lead-free RoHS compliance is mandatory. |
Compared with AP7343Q-185FDUW-7, the FDZW variant offers identical regulation performance but optimized for Type A1 assembly processes and AOI; versus TLD1120FVQ-TP, it delivers 1.5× lower output noise and 10dB higher PSRR - critical for RF and high-speed imaging applications.
Availability
AP7343Q-185FDZW-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, vehicle-to-everything (V2X) transceivers, and telematics control units requiring stable component supply across extended temperature ranges and AEC-Q100-compliant sourcing.
Supply support for AP7343Q-185FDZW-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, computing, and consumer markets - with ISO/TS 16949-certified manufacturing and AEC-Q100 product validation expertise.
The AP7343Q series belongs to Diodes' automotive-qualified LDO portfolio, engineered specifically for noise-sensitive point-of-load regulation in ADAS, infotainment, and body electronics - emphasizing PSRR, thermal robustness, and zero-defect reliability.
FAQ
What is the maximum allowable input voltage for AP7343Q-185FDZW-7?
The absolute maximum input voltage is 6.0V per the datasheet's Absolute Maximum Ratings table. However, the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V may trigger thermal shutdown or degrade long-term reliability, especially at high ambient temperatures. For sustained operation, VIN should remain ≤5.25V with adequate derating based on load current and PCB thermal design.
Does AP7343Q-185FDZW-7 include output discharge functionality?
No. The "Q" suffix explicitly denotes the non-discharge version, confirmed by the functional block diagram (labeled "AP7343Q (Without Discharge)") and ordering information table. When disabled via EN pin, the output remains floating - no internal FET discharges COUT. This avoids unintended discharge of downstream hold-up capacitors in multi-rail systems where sequencing matters.
How should the exposed pad (EP) be connected on the PCB?
The exposed pad must be soldered to a dedicated thermal copper area ≥100mm², connected to the system GND plane using ≥4 thermal vias (0.3mm diameter, spaced ≤1mm apart). It is not an electrical ground terminal - do not route signal traces to it. Leaving EP unconnected or using it as sole GND return violates thermal specs and risks junction overheating above 125°C under 300mA load.
Can AP7343Q-185FDZW-7 operate with a 1.0µF output capacitor?
Yes - the datasheet confirms stability with 1.0µF ceramic output capacitors (COUT). Layout best practice requires placing this capacitor within 3mm of VOUT and GND pins, using X5R/X7R dielectric with ≤100mΩ ESR. For loads with >100mA step transients, adding a parallel 4.7µF bulk capacitor improves droop recovery, as shown in Figure 8's load transient waveforms.
AP7343Q-185FDZW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-WDFN 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):
- 8.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (1kHz)
- Control Features:
- Current Limit, Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- W-DFN2020-6 (Type A1)
AP7343Q-185FDZW-7 FAQ
1.How can I place an order for AP7343Q-185FDZW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7343Q-185FDZW-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 AP7343Q-185FDZW-7 reliable?
The price and inventory of AP7343Q-185FDZW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7343Q-185FDZW-7 is usually 5 days.
3.What payment methods are accepted for AP7343Q-185FDZW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343Q-185FDZW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7343Q-185FDZW-7?
AP7343Q-185FDZW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7343Q-185FDZW-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 AP7343Q-185FDZW-7?
For technical support, including AP7343Q-185FDZW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343Q-185FDZW-7 requirements.
6.How does Aetrix verify that AP7343Q-185FDZW-7 is sourced from the original manufacturer or authorized distributors?
All AP7343Q-185FDZW-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 AP7343Q-185FDZW-7 meets industry standards.
7.What is the process for return or replacement of AP7343Q-185FDZW-7?
All AP7343Q-185FDZW-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7343Q-185FDZW-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 AP7343Q-185FDZW-7 part is unused and in its original packaging.
Return procedure for AP7343Q-185FDZW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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