Diodes Incorporated AP7347D-50FDZW-7B

Overview

AP7347D-50FDZW-7B from Diodes Incorporated is a 500mA, 5.0V fixed-output 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 subsystems in automotive infotainment and ADAS domain controllers where stable 5.0V rail integrity is critical.

For engineers reviewing the AP7347D-50FDZW-7B datasheet, AP7347D-50FDZW-7B pinout, AP7347D-50FDZW-7B application, or AP7347D-50FDZW-7B equivalent, key selection criteria include dropout voltage at 500mA (≤320mV for V_OUT = 5.0V), EN logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.25V), thermal resistance (θ_JA = 54°C/W), and wettable-flank W-DFN2020-6 package compatibility with automated optical inspection.

Technical Context

The AP7347D-50FDZW-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 for 100mA step) and high line regulation (0.02%/V).

It operates across 1.7V–5.5V input range with guaranteed 500mA output, supports shutdown via EN pin (I_LEAK ≤ ±1µA), and includes thermal shutdown at +170°C with +20°C hysteresis. The fixed 5.0V output is trimmed at wafer level to ±1% over -40°C to +125°C ambient.

Key Specifications

Pinout & Package

AP7347D-50FDZW-7B uses the W-DFN2020-6 (SWP) Type A1 wettable-flank package (2.0mm × 2.0mm × 0.75mm), optimized for AOI-compatible solder joint inspection and thermal performance via exposed pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7347D-50FDZW-7B, the AP7361D-50W5-7 trades thermal performance and manufacturability for lower cost in non-automotive applications, while the TLD5098ELXUMA1 adds safety features at the expense of output current and quiescent power - making the AP7347D optimal for high-density, noise-critical automotive modules needing 500mA and AOI support.

Availability

AP7347D-50FDZW-7B is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, telematics control units, and body control modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP7347D-50FDZW-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, with ISO/TS 16949-certified operations.

The AP7347D belongs to Diodes' high-PSRR, low-noise LDO family engineered specifically for automotive-grade power integrity in noise-sensitive domains like infotainment, ADAS, and telematics - emphasizing thermal robustness, wettable-flank packaging, and AEC-Q200 alignment.

FAQ

What is the minimum input voltage required for AP7347D-50FDZW-7B to maintain 5.0V output at 500mA?

The dropout voltage is ≤320mV at 500mA for V_OUT = 5.0V per datasheet Table 1. Therefore, minimum VIN is 5.32V under worst-case conditions. At room temperature and lighter loads, operation down to 5.1V is feasible, but 5.32V ensures full-spec compliance across -40°C to +125°C junction temperature range.

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

No - Diodes explicitly recommends connecting NC pins 2 and 5 to GND. This maximizes PCB copper area for thermal dissipation and improves EMI shielding. Leaving them floating may degrade thermal performance and increase susceptibility to noise coupling, especially in automotive environments with high E-field interference.

Does AP7347D-50FDZW-7B support reverse current blocking during shutdown?

No - the device lacks intrinsic reverse current blocking. However, its auto-discharge function (30Ω NMOS path from VOUT to GND when EN = low) actively drains output capacitance, preventing back-powering of upstream sources. For true reverse-blocking, an external Schottky diode in series with VIN is required.

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

No - the exposed pad is thermally conductive only and has no internal electrical connection. It must be soldered to a large GND copper pour for heat transfer, but must not be used as the sole GND return path. The dedicated Pin 3 (GND) remains the primary electrical ground reference for stability and noise control.