Diodes Incorporated AP7343DQ-29FDZW-7

Overview

AP7343DQ-29FDZW-7 from Diodes Incorporated is an AEC-Q100 Grade 1 automotive-qualified 300mA low-dropout regulator with fixed 2.9V output, ±1% accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). It operates from 1.7V to 5.25V input, delivers 300mA continuous current, and features enable control and thermal shutdown-designed for noise-sensitive ADAS camera power rails.

For engineers reviewing the AP7343DQ-29FDZW-7 datasheet, AP7343DQ-29FDZW-7 pinout, AP7343DQ-29FDZW-7 application, or AP7343DQ-29FDZW-7 equivalent, key selection criteria include guaranteed 300mA load capability at 2.9V under -40°C to +125°C ambient, ultra-low quiescent current (35µA typ), and W-DFN2020-6 (SWP) Type A1 package thermal performance (θ_JA = 54°C/W).

Technical Context

The AP7343DQ-29FDZW-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active discharge path (enabled via EN pin low state). Its architecture supports fast line/load transient response-demonstrated by <100µs recovery time under 1mA↔300mA step loads with 1µF C_OUT.

Unlike the non-discharge AP7343Q variant, this DQ version includes an internal N-channel MOSFET (R_ON = 30Ω typ) between VOUT and GND for controlled output discharge during shutdown, critical for sequencing in multi-rail automotive systems where residual voltage must be cleared within defined timing windows.

Key Specifications

Pinout & Package

AP7343DQ-29FDZW-7 uses the W-DFN2020-6 (SWP) Type A1 package: 2.0mm × 2.0mm, 0.5mm pitch, wettable flank leads, exposed thermal pad (EP). The EP must be connected to PCB ground plane for optimal thermal dissipation (θ_JC = 17°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343Q-29FDZW-7, the DQ version adds essential discharge functionality for automotive sequencing compliance without sacrificing noise or PSRR; versus TLD1120-29ES, it trades current capacity for lower IQ, tighter accuracy, and full AEC-Q100 qualification-making it the sole fit for ADAS camera power rails.

Availability

AP7343DQ-29FDZW-7 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC I/O rails, RF transceiver bias supplies, and telematics modem VDDIO requiring stable component supply with AEC-Q100 Grade 1 assurance.

Supply support for AP7343DQ-29FDZW-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 devices, with manufacturing certified to IATF 16949 and AEC-Q100 product qualification standards.

The AP7343Q/DQ series targets automotive power management, specifically addressing noise-sensitive LDO requirements in ADAS, infotainment, and connectivity systems where high PSRR, low noise, and AEC-Q100 compliance are mandatory.

FAQ

What is the purpose of the NC pins on AP7343DQ-29FDZW-7?

Pins 2 and 5 are no-connect terminals with no internal connection. They are provided solely to enhance thermal conduction and mechanical stability. Diodes Incorporated recommends connecting them to the PCB ground plane to maximize copper area for heat dissipation-this reduces θ_JA by up to 8°C/W compared to leaving them floating.

Does AP7343DQ-29FDZW-7 require an external discharge resistor?

No. Unlike non-DQ variants, AP7343DQ-29FDZW-7 integrates a dedicated 30Ω NMOS discharge path between VOUT and GND. When EN is pulled low, this transistor activates automatically, discharging the output capacitor without external components-ensuring VOUT falls below 100mV within 100µs under typical 1µF C_OUT conditions.

Can AP7343DQ-29FDZW-7 operate with input voltage below 2.9V?

Yes, but only down to VIN = VOUT + dropout voltage. At 300mA load, maximum dropout is 0.22V, so minimum functional VIN is 3.12V. Below that, regulation fails and VOUT drops linearly with VIN. For sub-3.12V operation, the device remains functional as a pass element but cannot maintain 2.9V output.

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

Type A1 (FDZW) and Type UXD (FDUW) share identical footprint and thermal pad layout but differ in lead finish and mold compound. Type A1 uses matte Sn plating optimized for standard reflow, while Type UXD features enhanced wettable flanks for automated optical inspection (AOI) of solder joints-both deliver identical θ_JA (54°C/W vs 53.3°C/W) and electrical performance.