Diodes Incorporated AP7347D-29W5-7

Overview

AP7347D-29W5-7 from Diodes Incorporated is a 2.9V 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-29W5-7 datasheet, AP7347D-29W5-7 pinout, AP7347D-29W5-7 application, or AP7347D-29W5-7 equivalent, key selection criteria include dropout voltage at 500mA (0.27–0.32V for 2.9V output), quiescent current (60µA typ), EN logic thresholds (0.5V_IL/1.25V_IH), and SOT25 thermal resistance (θ_JA = 140°C/W).

Technical Context

The AP7347D-29W5-7 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) while maintaining fast load transient response (<200µs settling) and high PSRR across 10Hz–1MHz.

It operates over 1.7V–5.5V input range and delivers stable 2.9V output with ±1% accuracy from –40°C to +125°C ambient. Thermal shutdown triggers at +170°C with +20°C hysteresis, and short-circuit foldback limits output current to ~180mA during V_OUT–GND fault.

Key Specifications

Pinout & Package

SOT25 (Type A1) package: 5-pin surface-mount with exposed pad not present; footprint optimized for thermal performance on 1oz copper PCBs. Pin 4 is NC (no internal connection); recommended tied to GND for thermal relief.

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, the AP7347D-29W5-7 uniquely combines 500mA capability, 0.27V dropout, 75dB PSRR, and integrated auto-discharge-making it optimal for automotive and industrial systems requiring robust, low-noise, sequenced power delivery.

Availability

AP7347D-29W5-7 is available at Aetrix Electronics and suitable for automotive infotainment, portable medical sensors, industrial PLC I/O modules, and wireless edge node controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP7347D-29W5-7 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design centers in Asia, Europe, and the U.S., serving automotive, industrial, and consumer markets.

The AP7347D series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive applications in automotive electronics and portable instrumentation where precision regulation and fast transient response are critical.

FAQ

What is the maximum allowable input voltage for AP7347D-29W5-7?

The absolute maximum input voltage is 6.0V per the datasheet's Absolute Maximum Ratings. Continuous operation above 5.5V violates Recommended Operating Conditions and risks permanent damage. For reliable 2.9V output, VIN must remain between 1.7V and 5.5V, with minimum headroom of 0.27V at 500mA load to maintain regulation.

Does AP7347D-29W5-7 require an external output capacitor, and what value is recommended?

Yes, a minimum 1.0µF ceramic capacitor is required between VOUT and GND for stability and transient response. The datasheet confirms compatibility with low-ESR ceramics and recommends placing it within 2mm of the VOUT and GND pins. Larger values (e.g., 10µF) may improve load step response but are not mandatory for basic operation.

How does the auto-discharge function operate, and what is its on-resistance?

When EN is pulled low, an internal 30Ω NMOS switch connects VOUT to GND, actively discharging output capacitance. This ensures rapid VOUT decay-critical for power sequencing and avoiding latch-up in downstream logic. The 30Ω value is specified under VIN = 4.0V and EN = 0V conditions, enabling predictable discharge time constants.

Is AP7347D-29W5-7 qualified for automotive applications?

The base AP7347D-29W5-7 is not AEC-Q200 qualified; however, Diodes offers the automotive-grade variant AP7347DQ-29W5-7, which undergoes extended temperature stress testing (–40°C to +125°C), HTOL, and ESD qualification per AEC-Q200 Rev D. For automotive designs, AP7347DQ must be specified explicitly.