Diodes Incorporated AP7347D-28FDZW-7B

Overview

AP7347D-28FDZW-7B from Diodes Incorporated is a 2.8V fixed-output, 500mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, and 60µV_rms output noise (10Hz–100kHz). Built on CMOS process, it features enable control, thermal shutdown, short-circuit protection, and auto-discharge functionality. It powers noise-sensitive analog rails in automotive infotainment modules.

For engineers reviewing the AP7347D-28FDZW-7B datasheet, AP7347D-28FDZW-7B pinout, AP7347D-28FDZW-7B application, or AP7347D-28FDZW-7B equivalent, key selection criteria include dropout voltage at 500mA (0.27–0.32V for 2.8V output), EN logic thresholds (0.5V low / 1.25V high), W-DFN2020-6 thermal resistance (θ_JA = 54°C/W), and wettable flank compatibility for automated optical inspection.

Technical Context

The AP7347D-28FDZW-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and NMOS pass transistor with auto-discharge path. Its CMOS architecture enables ultra-low quiescent current (60µA typical) while maintaining fast load transient response (<200µs settling).

It operates across 1.7V–5.5V input range and delivers stable 2.8V output with ±1% accuracy over -40°C to +125°C ambient. The enable pin controls full-on/off states with 0.01µA standby current, and internal thermal shutdown activates at +170°C with +20°C hysteresis.

Key Specifications

Pinout & Package

AP7347D-28FDZW-7B uses the W-DFN2020-6 (SWP) Type A1 package: 2.0mm × 2.0mm × 0.75mm body, wettable flanks, exposed thermal pad (EP). The package supports high-density layout and automated optical inspection (AOI) of solder joints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7347D-28FDZW-7B, AP7361D-28FDZW-7B offers higher current headroom but sacrifices PSRR (70dB) and noise performance (75µV_rms); TLD1128-1ES provides automotive qualification but lacks programmable enable and compact footprint, limiting flexibility in modern ADAS domain controllers.

Availability

AP7347D-28FDZW-7B is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply, wettable flank inspection capability, and AEC-Q200-aligned reliability.

Supply support for AP7347D-28FDZW-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 solutions for automotive, industrial, and consumer markets.

The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO family engineered specifically for noise-sensitive automotive electronics, emphasizing thermal robustness, small-footprint packaging, and precise voltage regulation under wide temperature and load conditions.

FAQ

What is the minimum input voltage required for AP7347D-28FDZW-7B to regulate 2.8V at 500mA?

The minimum input voltage is determined by dropout voltage: 0.27–0.32V above 2.8V, so VIN ≥ 3.07V is required for full 500mA output. Below this, output current capability degrades linearly per the dropout curve in the datasheet's Electrical Characteristics table.

Can the NC pins on the W-DFN2020-6 package be left unconnected?

No - pins 2 and 5 are designated NC but must be connected to GND per the datasheet recommendation. This maximizes PCB copper area for thermal dissipation and reduces EMI susceptibility; floating NC pins may cause instability or increased radiated emissions.

Does AP7347D-28FDZW-7B support reverse current blocking during shutdown?

No - the device does not integrate reverse current blocking. During shutdown, the auto-discharge path (30Ω NMOS from VOUT to GND) actively pulls VOUT to GND, but external back-to-back FETs or diodes are required if reverse current from downstream capacitors must be prevented.

Is the exposed pad (EP) electrically connected to GND internally?

No - the EP is thermally conductive only and has no internal electrical connection. It must be soldered to a GND copper pour for heat transfer, but should not serve as the sole GND return path; dedicated GND pin (pin 3) must carry all return current.