Diodes Incorporated AP7343DQ-18FDZW-7

Overview

AP7343DQ-18FDZW-7 from Diodes Incorporated is an automotive-grade 300mA low-dropout linear regulator with fixed 1.8V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current - designed for noise-sensitive power domains in ADAS cameras and infotainment RF supplies.

For engineers reviewing the AP7343DQ-18FDZW-7 datasheet, AP7343DQ-18FDZW-7 pinout, AP7343DQ-18FDZW-7 application, or AP7343DQ-18FDZW-7 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, W-DFN2020-6 (SWP) Type A1 thermal performance (θ_JA = 54°C/W), enable-controlled shutdown, and absence of internal discharge circuitry (DQ suffix denotes discharge variant, but this part is *non-discharge* per ordering code FDZW + DQ prefix inconsistency resolved via Diodes' official ordering matrix: AP7343DQ-XXXFDZW-7 = discharge version).

Technical Context

The AP7343DQ-18FDZW-7 implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current limit, and thermal shutdown. It operates across 1.7V–5.25V input range and maintains regulation down to 300mA load at 1.8V output with dropout as low as 0.35V (typical at I_OUT = 300mA, V_OUT = 1.8V).

Its EN pin supports active-high logic control (V_IL ≤ 0.5V, V_IH ≥ 1.3V), enabling precise sequencing in multi-rail automotive systems. The device delivers stable operation with 1µF ceramic C_IN/C_OUT, and features foldback short-circuit protection limiting output current to 55mA during V_OUT-to-GND fault.

Key Specifications

Pinout & Package

AP7343DQ-18FDZW-7 uses the W-DFN2020-6 (SWP) Type A1 package (2.0mm × 2.0mm × 0.65mm), featuring wettable flanks for automated optical inspection and an exposed thermal pad (EP) requiring GND-connected copper pour for optimal θ_JA = 54°C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343Q-18FDZW-7, the DQ variant adds controlled output discharge (30Ω on-resistance) for safe rail collapse, while TLD1123-18ES trades enable control and precision for integration into lighting-specific bias networks - making AP7343DQ-18FDZW-7 the sole choice for sequenced, low-noise, AEC-Q100-compliant 1.8V POL in ADAS vision systems.

Availability

AP7343DQ-18FDZW-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and wireless V2X communication designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for AP7343DQ-18FDZW-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 for automotive, industrial, and consumer markets, with ISO/TS 16949-certified manufacturing facilities.

The AP7343Q/DQ series targets automotive power management, delivering high-PSRR, low-noise LDOs optimized for noise-sensitive domains like camera ISPs, RF transceivers, and infotainment SoCs - with emphasis on AEC-Q100 qualification and PPAP readiness.

FAQ

What is the thermal performance difference between W-DFN2020-6 (SWP) Type A1 and Type UXD packages?

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 θ_JA = 53.3°C/W and θ_JC = 18.3°C/W. Both enable 300mA operation at +125°C ambient with ≥40mm² GND copper, but Type A1 offers marginally better junction-to-case transfer for stacked thermal vias.

Does AP7343DQ-18FDZW-7 include an internal discharge transistor?

Yes. Per Diodes' ordering matrix, the "DQ" prefix indicates discharge capability. This part integrates a 30Ω NMOS FET between VOUT and GND, activated when EN is low, discharging external capacitors to <0.5V within 100µs (C_OUT = 1µF), ensuring safe power-down sequencing in multi-rail systems.

Can AP7343DQ-18FDZW-7 operate with input voltage below 1.8V?

No. The minimum input voltage is 1.7V, but dropout voltage at 300mA is 0.35V (typ). To maintain 1.8V output under full load, VIN must be ≥2.15V. Operation below 2.15V results in unregulated output and potential system reset - verify minimum battery voltage in cold-crank conditions.

Is the EN pin 5V-tolerant when driven from a 5V microcontroller GPIO?

Yes. The EN pin absolute maximum rating is 6.0V, and its logic-high threshold is 1.3V (min). Driving it directly from a 5V GPIO is safe and eliminates level-shifting complexity, provided series resistance limits inrush current during hot-plug scenarios.