Diodes Incorporated AP7343DQ-27W5-7

Overview

AP7343DQ-27W5-7 from Diodes Incorporated is an automotive-grade 300mA low-dropout regulator with fixed 2.7V 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 operates across –40°C to +125°C for infotainment power supplies and ADAS point-of-load applications.

For engineers reviewing the AP7343DQ-27W5-7 datasheet, AP7343DQ-27W5-7 pinout, AP7343DQ-27W5-7 application, or AP7343DQ-27W5-7 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, SOT25 package compatibility, discharge functionality, dropout voltage ≤310mV at 300mA (for VOUT=2.7V), and guaranteed 300mA output under automotive ambient conditions.

Technical Context

The AP7343DQ-27W5-7 integrates a CMOS-based LDO architecture with internal voltage reference, error amplifier, current limit circuit, and active discharge path activated during shutdown. Its enable input (EN) accepts logic-level control (VIH ≥1.3V, VIL ≤0.5V) and supports fast turn-on/turn-off waveforms with minimal output overshoot.

It delivers stable regulation across 1.7V–5.25V input range while maintaining <30mV load regulation (1–300mA) and <0.1%/V line regulation. The built-in discharge function actively pulls VOUT to GND when EN is low, eliminating residual voltage hold-up in safety-critical automotive subsystems.

Key Specifications

Pinout & Package

AP7343DQ-27W5-7 is packaged in SOT25 (5-pin, surface-mount), offering compact footprint and thermal performance suitable for dense automotive PCB layouts. The exposed pad is not electrically connected but enhances thermal dissipation when tied to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7343Q-27W5-7, the DQ variant adds critical discharge capability for fail-safe shutdown in ADAS, while TLD1120FV trades output current and noise performance for integrated diagnostics-making AP7343DQ-27W5-7 optimal for high-fidelity 2.7V POL where both automotive compliance and rapid rail collapse are required.

Availability

AP7343DQ-27W5-7 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, camera modules, and wireless communication subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP7343DQ-27W5-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

The AP7343Q/DQ series belongs to Diodes' automotive-qualified LDO portfolio, designed specifically to meet stringent AEC-Q100 requirements and deliver ultra-low noise, high PSRR, and robust thermal behavior in safety-critical vehicle subsystems.

FAQ

What is the purpose of the NC pin on AP7343DQ-27W5-7?

The NC (No Connect) pin is internally unconnected but serves a mechanical and thermal role. It is recommended to connect this pin to the PCB ground plane to improve heat dissipation through increased copper area and reduce electromagnetic interference. This practice also stabilizes the package during reflow soldering and enhances mechanical rigidity in vibration-prone automotive environments.

Does AP7343DQ-27W5-7 require an external discharge FET?

No. AP7343DQ-27W5-7 integrates an on-chip NMOS discharge transistor (RON ≈30Ω) that automatically activates when the EN pin is pulled low. This eliminates the need for external components to discharge the output capacitor, reducing BOM count and board space-critical for compact ADAS camera modules and radar ECUs where layout density is constrained.

How does the AP7343DQ-27W5-7 perform under cold-crank conditions?

Under cold-crank (VIN dropping to 1.7V), AP7343DQ-27W5-7 maintains regulation down to its minimum input voltage specification. With a maximum dropout of 310mV at 300mA, it sustains 2.7V output even when input falls to 3.01V - well above the 1.7V lower limit. This ensures uninterrupted operation of 2.7V-dependent imaging sensors during engine start-up in sub-zero climates.

Can AP7343DQ-27W5-7 be used with ceramic output capacitors smaller than 1µF?

Yes, the device is stable with ceramic output capacitors as low as 0.47µF, though 1µF is recommended for optimal transient response across full 300mA load steps. Using smaller values may increase output voltage deviation during fast load transients (e.g., ISP burst processing), particularly when paired with higher-ESR ceramics; design validation under worst-case load profiles is advised.