Diodes Incorporated AP7347DQ-33FDZW-7B

Overview

AP7347DQ-33FDZW-7B from Diodes Incorporated is an automotive-grade 3.3V fixed-output low-dropout regulator delivering 500mA output current with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). 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-33FDZW-7B datasheet, AP7347DQ-33FDZW-7B pinout, AP7347DQ-33FDZW-7B application, or AP7347DQ-33FDZW-7B equivalent, key selection criteria include its AEC-Q100 qualification, WDFN2020-6 wettable flank package, 0.14–0.32V dropout at 500mA (for 3.3V output), 60µA quiescent current, and guaranteed operation from –40°C to +125°C ambient.

Technical Context

The AP7347DQ-33FDZW-7B integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and NMOS pass transistor with auto-discharge capability. Its internal architecture supports fast load transient response (<10µs settling) and stable operation with only 1µF ceramic input/output capacitors.

It operates across a 1.7V–5.5V input range while maintaining 3.3V output regulation, with line regulation of 0.02%/V and load regulation of 22.5mV over 1–500mA. The EN pin accepts logic-level control (V_IL ≤ 0.5V, V_IH ≥ 1.25V) and draws <1µA leakage current.

Key Specifications

Pinout & Package

AP7347DQ-33FDZW-7B 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) connection to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B332MR-G and RT9080AL-33PUF, the AP7347DQ-33FDZW-7B uniquely combines AEC-Q100 Grade 1 qualification, wettable flank packaging for process traceability, 60µV_rms noise, and integrated auto-discharge-making it the only drop-in solution for safety-critical ADAS power domains requiring zero back-feed risk and AOI-verifiable assembly.

Availability

AP7347DQ-33FDZW-7B is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power delivery, and telematics modem biasing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP7347DQ-33FDZW-7B 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 ICs, with design centers in Asia, Europe, and the U.S., and manufacturing in IATF 16949-certified facilities.

The AP7347DQ series belongs to Diodes' automotive-qualified LDO portfolio, engineered specifically for noise-sensitive power domains in ADAS, infotainment, and body electronics where AEC-Q100 compliance, low PSRR, and thermal robustness are mandatory.

FAQ

What is the thermal resistance (θ_JA) of AP7347DQ-33FDZW-7B in standard JEDEC layout?

The W-DFN2020-6 (SWP) package achieves θ_JA = 54°C/W on a JEDEC-standard 3"×3" multilayer board with 1oz internal planes and 2oz top/bottom copper. This value assumes full EP soldering to a 200mm² GND copper pour; reducing copper area increases θ_JA proportionally.

Does AP7347DQ-33FDZW-7B require an external discharge resistor?

No. The device integrates an NMOS auto-discharge switch (R_ON ≈ 30Ω) between VOUT and GND, activated automatically when EN is pulled low. This discharges VOUT to <0.1V within 100µs, eliminating need for external components and simplifying BOM.

Can AP7347DQ-33FDZW-7B operate with input voltage below 2.0V?

Yes. The absolute minimum input is 1.7V, and it maintains regulation down to V_IN = V_OUT + dropout (0.14V typ. at 500mA). At 1.8V input, it delivers full 3.3V output with 100mA load; output collapses only when V_IN falls below ~3.44V at full 500mA.

Is the NC pin on AP7347DQ-33FDZW-7B required to be grounded?

Not electrically required, but strongly recommended. Pins 2 and 5 are internally unconnected; tying them to GND improves thermal dissipation through additional PCB copper and reduces EMI susceptibility. Diodes' layout guidelines explicitly advise grounding NC pins for automotive reliability.