Diodes Incorporated AP7347DQ-50FDZW-7

Overview

AP7347DQ-50FDZW-7 from Diodes Incorporated is an automotive-grade 500mA low-dropout linear regulator with fixed 5.0V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 60µA quiescent current. It features enable control, thermal shutdown, short-circuit protection, and auto-discharge functionality - designed for noise-sensitive power rails in ADAS camera modules and infotainment systems.

For engineers reviewing the AP7347DQ-50FDZW-7 datasheet, AP7347DQ-50FDZW-7 pinout, AP7347DQ-50FDZW-7 application, or AP7347DQ-50FDZW-7 equivalent, key selection criteria include AEC-Q100 qualification, WDFN2020-6 wettable flank package thermal performance (θ_JA = 54°C/W), dropout voltage ≤320mV at 500mA, and EN logic thresholds (V_IL ≤0.5V, V_IH ≥1.25V).

Technical Context

The AP7347DQ-50FDZW-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and NMOS pass transistor with auto-discharge path. Its architecture delivers fast load transient response (<10µs settling) and stable operation with 1µF ceramic input/output capacitors.

It operates across 1.7V–5.5V input range, supports junction temperatures from –40°C to +150°C, and includes thermal shutdown at +170°C with +20°C hysteresis. The enable pin controls full rail shutdown (I_STANDBY ≤1.0µA) and is compatible with standard logic-level signals.

Key Specifications

Pinout & Package

AP7347DQ-50FDZW-7 uses the W-DFN2020-6 (SWP) wettable flank package (2.0mm × 2.0mm, 0.75mm height), optimized for automated optical inspection (AOI) and thermal performance via exposed pad (EP). The EP must be connected to GND or large copper pour for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79950DRVR and NCP114AMX50T2G, AP7347DQ-50FDZW-7 uniquely combines AEC-Q100 Grade 1, auto-discharge, 60µV_rms noise, and wettable flank packaging - making it the only option qualified for ADAS camera and V2X RF power delivery where functional safety and signal integrity are mandatory.

Availability

AP7347DQ-50FDZW-7 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power domains, and telematics RF subsystems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for AP7347DQ-50FDZW-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 automotive-qualified components.

The AP7347DQ series belongs to Diodes' automotive LDO portfolio, engineered specifically for noise-sensitive, safety-critical power rails in ADAS, infotainment, and vehicle connectivity systems.

FAQ

What is the minimum input voltage required for AP7347DQ-50FDZW-7 to maintain 5.0V regulation at 500mA?

The minimum input voltage is determined by dropout voltage: at 500mA and 5.0V output, max dropout is 320mV per datasheet. Thus, VIN must be ≥5.32V to sustain regulation. However, absolute minimum VIN rating is 1.7V - below this, the device may not power up or could enter undervoltage lockout.

Can the NC pins (2 and 5) on the W-DFN2020-6 package be left floating?

No - pins 2 and 5 are internally unconnected but thermally and electrically recommended to be tied to GND. Doing so improves thermal dissipation through additional copper paths and reduces EMI susceptibility. Leaving them floating may degrade thermal performance and increase radiated emissions in high-frequency automotive environments.

Does AP7347DQ-50FDZW-7 require an external discharge resistor for VOUT?

No - the device integrates an NMOS auto-discharge switch (R_ON ≈30Ω) activated when EN is low. This discharges VOUT to GND within ~100µs, eliminating need for external resistor and saving board space - critical in dense ADAS camera PCB layouts.

Is the exposed pad (EP) electrically connected to GND inside the AP7347DQ-50FDZW-7 die?

No - the EP is a thermal-only pad with no internal electrical connection. It must be soldered to a GND copper pour solely for heat transfer; using it as a functional GND node violates the pinout definition and risks thermal stress-induced solder joint failure due to CTE mismatch.