Diodes Incorporated AP7343DQ-30W5-7

Overview

AP7343DQ-30W5-7 from Diodes Incorporated is an automotive-grade 300mA low-dropout linear regulator with fixed 3.0V output, ±1% accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). Built on CMOS process, it features enable control, thermal shutdown, and short-circuit protection, and is qualified to AEC-Q100 Grade 1 for use in ADAS camera power rails and infotainment domain controllers.

For engineers reviewing the AP7343DQ-30W5-7 datasheet, AP7343DQ-30W5-7 pinout, AP7343DQ-30W5-7 application, or AP7343DQ-30W5-7 equivalent, key selection criteria include its 1.7V–5.25V input range, 35µA quiescent current, SOT25 package footprint, and automotive-compliant thermal performance up to +125°C ambient.

Technical Context

The AP7343DQ-30W5-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and CMOS pass transistor-enabling stable regulation under fast load transients (e.g., 1mA ↔ 300mA in <100µs) while maintaining 60µV_rms noise floor. Its enable input supports controlled power sequencing in multi-rail automotive systems.

Unlike standard LDOs, this variant includes an internal discharge FET (enabled by "D" in part number), actively pulling VOUT to GND during shutdown to prevent back-powering of downstream circuitry-a critical requirement in safety-critical ADAS sensor modules.

Key Specifications

Pinout & Package

AP7343DQ-30W5-7 is housed in a lead-free, RoHS-compliant SOT25 (SC-74A) package with 5 pins and exposed thermal pad functionality. The small 2.9mm × 2.8mm footprint supports high-density automotive PCB layouts while enabling efficient heat dissipation via PCB copper area connected to Pin 2 (GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343Q-30W5-7, the DQ variant adds essential discharge functionality for functional safety compliance; versus TLD1120FV, it trades voltage range and diagnostics for ultra-low noise and minimal quiescent current in compact 3.0V domains.

Availability

AP7343DQ-30W5-7 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, wireless communications subsystems, and RF power amplifier biasing requiring stable component supply with full AEC-Q100 documentation support.

Supply support for AP7343DQ-30W5-7 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, with design, manufacturing, and test facilities certified to IATF 16949 for automotive-grade components.

The AP7343Q series was developed specifically for automotive power management-delivering high PSRR, low noise, and AEC-Q100 qualification in miniature W-DFN and SOT packages for space-constrained ADAS and infotainment systems.

FAQ

What is the purpose of the NC pin on AP7343DQ-30W5-7?

Pin 4 is internally unconnected but thermally and electrically tied to the die substrate. Diodes Incorporated recommends connecting it to GND on the PCB to improve thermal dissipation and reduce radiated emissions-especially critical in automotive EMC-constrained environments. Leaving it floating may degrade thermal resistance by up to 15°C/W.

Does AP7343DQ-30W5-7 require an external discharge resistor?

No. Unlike non-D variants, AP7343DQ-30W5-7 integrates a dedicated NMOS discharge FET (30Ω typical R_ON) between VOUT and GND, activated automatically when EN is low. This eliminates need for external resistors, reduces BOM count, and ensures predictable discharge time (<100µs for 1µF load), meeting ISO 26262 ASIL-B timing requirements.

How does the AP7343DQ-30W5-7 perform under cold-crank conditions?

With a minimum input voltage of 1.7V and dropout voltage as low as 0.22V at 300mA, the device sustains regulated 3.0V output down to VIN = 3.22V. During cold-crank (e.g., 4.0V battery sag), it remains fully operational-verified across -40°C to +125°C ambient per AEC-Q100 stress testing including load dump and reverse-battery immunity.

Can AP7343DQ-30W5-7 be used with ceramic output capacitors smaller than 1µF?

Yes-stability is guaranteed with ceramic capacitors ≥0.47µF and ESR ≤10mΩ. The datasheet confirms stable operation with 0.68µF X7R ceramics (e.g., Murata GRM188R61E684KAAL), enabling compact designs in space-limited camera modules. Larger values (e.g., 2.2µF) further improve load-transient undershoot (<15mV for 300mA step).