Diodes Incorporated AP7343DQ-09FDZW-7

Overview

AP7343DQ-09FDZW-7 from Diodes Incorporated is an automotive-grade 300mA low-dropout linear regulator with fixed 0.9V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, thermal shutdown, and short-circuit protection, and is qualified for ADAS camera and RF power supply applications in vehicles operating from –40°C to +125°C.

For engineers reviewing the AP7343DQ-09FDZW-7 datasheet, AP7343DQ-09FDZW-7 pinout, AP7343DQ-09FDZW-7 application, or AP7343DQ-09FDZW-7 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, W-DFN2020-6 (SWP) Type A1 package with wettable flanks, discharge function, and guaranteed 300mA output under 1.7V–5.25V input.

Technical Context

The AP7343DQ-09FDZW-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and thermal shutdown logic. Its architecture supports fast load transient response (<100µs settling) and stable operation with 1µF ceramic output capacitors due to low-ESR optimization.

Unlike the non-discharge AP7343Q variant, this part includes an internal N-channel MOSFET (R_ON = 30Ω) between VOUT and GND for active output discharge during shutdown-critical for sequencing-sensitive automotive domains like infotainment SoC power rails.

Key Specifications

Pinout & Package

AP7343DQ-09FDZW-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). The EP must be connected to a large copper pour tied to GND for optimal thermal dissipation (θ_JA = 54°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with AP7343Q-09FDZW-7, the DQ version adds critical discharge functionality for robust power sequencing, while versus TPS7A0509PDBVR, it trades marginal I_Q reduction for automotive qualification, higher PSRR, and lower noise-making it the sole fit for AEC-Q100-compliant 0.9V POL in radar or camera ECUs.

Availability

AP7343DQ-09FDZW-7 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and vehicle-to-everything (V2X) RF subsystems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AP7343DQ-09FDZW-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 manufacturer specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US, and manufacturing in IATF 16949-certified facilities.

The AP7343Q/DQ series targets automotive power management, specifically addressing noise-sensitive point-of-load regulation in ADAS, infotainment, and telematics systems where AEC-Q100 compliance and thermal robustness are mandatory.

FAQ

What is the purpose of the NC pins (2 and 5) on the W-DFN2020-6 (SWP) package?

The NC pins on AP7343DQ-09FDZW-7 are not connected internally. Diodes Incorporated recommends tying them to GND on the PCB to maximize thermal dissipation through increased copper area and to improve EMI shielding. Leaving them floating may degrade thermal performance and increase susceptibility to noise coupling.

Does AP7343DQ-09FDZW-7 require an external discharge resistor?

No. AP7343DQ-09FDZW-7 integrates an internal 30Ω N-channel MOSFET between VOUT and GND that activates automatically when EN is pulled low, discharging the output capacitance without external components. This eliminates hold-up voltage and supports strict power sequencing requirements in automotive SoC designs.

Can AP7343DQ-09FDZW-7 operate with input voltage below 1.7V?

No. The absolute minimum input voltage is 1.7V per the Recommended Operating Conditions. Operation below this threshold risks dropout, regulation loss, or undefined behavior. At 0.9V output, the minimum functional VIN is 1.41V (0.9V + 0.51V dropout), but the device will not start or sustain regulation below 1.7V due to internal bias circuit limitations.

How does the W-DFN2020-6 (SWP) Type A1 package differ from Type UXD in thermal performance?

The W-DFN2020-6 (SWP) Type A1 (FDZW) has θ_JA = 54°C/W and θ_JC = 17°C/W, while Type UXD (FDUW) achieves slightly better θ_JA = 53.3°C/W and θ_JC = 18.3°C/W. Both use wettable flanks for solder inspection, but Type A1 is optimized for higher-volume automotive assembly with tighter coplanarity control, making it preferred for automated optical inspection in Tier-1 production lines.