Diodes Incorporated AP7343DQ-25W5-7

Overview

AP7343DQ-25W5-7 from Diodes Incorporated is an automotive-grade 300mA low-dropout linear regulator with fixed 2.5V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, thermal shutdown, short-circuit protection, and AEC-Q100 Grade 1 qualification for use in ADAS camera power rails and infotainment domain controllers.

For engineers reviewing the AP7343DQ-25W5-7 datasheet, AP7343DQ-25W5-7 pinout, AP7343DQ-25W5-7 application, or AP7343DQ-25W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.25–0.32V), EN logic thresholds (0.5V low / 1.3V high), thermal resistance (179°C/W in SOT25), and discharge functionality enabled by the "D" suffix.

Technical Context

The AP7343DQ-25W5-7 uses a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current limit, and thermal shutdown circuitry. Its enable input controls NMOS pass transistor conduction, while the built-in auto-discharge path (enabled by "D" suffix) actively pulls VOUT to GND during shutdown.

It operates across 1.7V–5.25V input range and delivers stable 2.5V output up to 300mA over –40°C to +125°C ambient. The device achieves 75dB ripple rejection at 1kHz and maintains <30mV load regulation from 1mA to 300mA, supporting fast transient response in noise-sensitive RF and sensor supply domains.

Key Specifications

Pinout & Package

AP7343DQ-25W5-7 is housed in a SOT25 (5-pin) package with wettable flank leads for automated optical inspection. The exposed pad is not electrically connected but must be thermally tied to PCB ground plane for optimal thermal dissipation (θ_JA = 179°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343Q-25W5-7, the D-suffix variant adds critical discharge capability for system-level power sequencing compliance, while TLD1120-25ES trades noise/PSRR performance for broader availability and simplified qualification documentation.

Availability

AP7343DQ-25W5-7 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, and V2X communication gateways requiring stable component supply, AEC-Q100 traceability, and production-ready packaging (3000-unit 7" tape & reel).

Supply support for AP7343DQ-25W5-7 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 components for automotive, industrial, and consumer markets, with ISO/TS 16949 and IATF 16949 certified manufacturing.

The AP7343Q series targets automotive power management applications demanding high PSRR, ultra-low noise, and AEC-Q100 compliance - specifically engineered for ADAS, infotainment, and body electronics subsystems operating in harsh thermal environments.

FAQ

What is the purpose of the NC pin on AP7343DQ-25W5-7?

Pin 5 is a no-connect terminal with no internal silicon connection. Diodes Incorporated recommends tying it to PCB ground to increase copper area for thermal dissipation and reduce EMI susceptibility. It must never be left floating or used as a signal path, as doing so may compromise thermal performance and EMC behavior in automotive layouts.

Does AP7343DQ-25W5-7 require an external discharge resistor?

No. The "D" suffix indicates integrated auto-discharge functionality via an internal 30Ω NMOS switch between VOUT and GND. When EN is pulled low, this path activates and discharges the output capacitor within 100µs, eliminating need for external resistors and reducing board space in space-constrained ADAS modules.

Can AP7343DQ-25W5-7 operate with input voltage below 2.5V?

Yes - the minimum input voltage is 1.7V, but regulation requires VIN ≥ VOUT + dropout voltage. At 300mA load, dropout is 0.22–0.31V, so stable 2.5V output requires VIN ≥ 2.72V. Below that, output drops linearly; operation down to 1.7V is valid only for light loads (<10mA) where dropout falls below 0.8V.

How does thermal performance differ between SOT25 and W-DFN2020-6 packages?

SOT25 has θ_JA = 179°C/W, limiting continuous 300mA operation to ≤+85°C ambient with standard 2-layer PCB. W-DFN2020-6 variants achieve θ_JA ≈ 53°C/W using thermal vias to inner ground planes, enabling full 300mA output at +125°C ambient - critical for under-hood camera ECU deployments.