Diodes Incorporated AP7347D-29FDZW-7B

Overview

AP7347D-29FDZW-7B from Diodes Incorporated is a 2.9V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage 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 automotive and portable electronics, it operates across 1.7V–5.5V input and delivers stable 2.9V power to microcontrollers, sensors, and RF circuitry.

For engineers reviewing the AP7347D-29FDZW-7B datasheet, AP7347D-29FDZW-7B pinout, AP7347D-29FDZW-7B application, or AP7347D-29FDZW-7B equivalent, key selection criteria include dropout voltage at 500mA (0.27–0.32V for 2.9V output), wettable-flank W-DFN2020-6 package for automated optical inspection, EN logic thresholds (0.5V_IL/1.25V_IH), and guaranteed operation from –40°C to +125°C ambient.

Technical Context

The AP7347D-29FDZW-7B integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and NMOS pass transistor with integrated auto-discharge path. Its architecture enables fast load transient response (<200µs settling) and high line regulation (0.02%/V typical) under varying input conditions.

It implements thermal shutdown at +170°C with +20°C hysteresis and foldback short-circuit protection limiting output current to ~180mA during V_OUT–to–GND fault. The enable input controls both regulation and internal discharge path activation, ensuring rapid output discharge when disabled.

Key Specifications

Pinout & Package

AP7347D-29FDZW-7B is packaged in the wettable-flank W-DFN2020-6 (SWP) Type A1 package (2.0mm × 2.0mm × 0.75mm), optimized for automated optical inspection (AOI) and high-density PCB layouts. The exposed pad (EP) must be connected to GND via multiple thermal vias for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-2902E/MB and XC6210B292MR-G, AP7347D-29FDZW-7B uniquely combines 500mA capability, 60µA operating IQ, integrated enable-controlled auto-discharge, and wettable-flank packaging-making it optimal for automotive and industrial designs requiring robust power sequencing, thermal efficiency, and manufacturability.

Availability

AP7347D-29FDZW-7B is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor nodes, portable medical monitors, and smart home hub controllers requiring stable component supply, high-reliability packaging, and extended temperature operation.

Supply support for AP7347D-29FDZW-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO family designed specifically for noise-sensitive applications in automotive infotainment, ADAS camera modules, and battery-powered industrial IoT endpoints.

FAQ

What is the maximum allowable input voltage for AP7347D-29FDZW-7B?

The absolute maximum input voltage is 6.0V. Operation above this rating risks permanent damage. For reliable continuous use, the recommended maximum is 5.5V per the Recommended Operating Conditions table. Input voltage must remain ≥ (2.9V + dropout) - i.e., ≥3.17V at 500mA - to maintain regulation.

Does AP7347D-29FDZW-7B require an external pull-up resistor on the EN pin?

No external pull-up is required. When EN control is unused, tie EN directly to VIN to ensure permanent enable. The internal EN input leakage is ±1µA, and the pin has defined logic thresholds (≤0.5V for low, ≥1.25V for high); floating EN is prohibited and may cause erratic regulation or increased quiescent current.

Can AP7347D-29FDZW-7B be used with ceramic output capacitors smaller than 1µF?

Yes - the device is stable with 1µF ceramic capacitors, and lower values (e.g., 0.47µF) may be used if transient load requirements permit. However, reducing C_OUT below 1µF degrades load transient response and increases output voltage deviation during step-load events; Diodes recommends ≥1µF for full specification compliance.

Is the exposed pad (EP) on AP7347D-29FDZW-7B electrically connected to GND?

No - the EP is thermally conductive but electrically isolated. It must be soldered to a PCB copper area tied to system GND for heat dissipation, but must not serve as the sole GND connection. The dedicated Pin 3 (GND) remains the primary electrical ground reference; using EP as GND electrode alone violates layout guidelines and risks thermal runaway.