Diodes Incorporated AP7347DQ-29FDZW-7B

Overview

AP7347DQ-29FDZW-7B from Diodes Incorporated is an AEC-Q100 qualified automotive-grade 500mA low-dropout linear regulator with fixed 2.9V output, ±1% 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 - deployed in ADAS camera power rails and infotainment domain controllers.

For engineers reviewing the AP7347DQ-29FDZW-7B datasheet, AP7347DQ-29FDZW-7B pinout, AP7347DQ-29FDZW-7B application, or AP7347DQ-29FDZW-7B equivalent, key selection criteria include dropout voltage at 500mA (0.27–0.32V for 2.9V output), WDFN2020-6 wettable flank package thermal performance (θ_JA = 54°C/W), EN logic thresholds (V_IL ≤ 0.5V, V_IH ≥ 1.25V), and automotive qualification status (IATF 16949 manufacturing, PPAP capable).

Technical Context

The AP7347DQ-29FDZW-7B integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and NMOS pass transistor with auto-discharge path. Its architecture delivers fast load transient response (<10µs settling) and stable operation with 1µF ceramic input/output capacitors.

It operates across 1.7V–5.5V input range, supports junction temperatures from –40°C to +150°C, and includes thermal shutdown (170°C trigger, 20°C hysteresis) and fold-back short-circuit protection (180mA clamp). The EN pin enables system-level power sequencing and deep-sleep mode (I_STANDBY ≤ 1.0µA).

Key Specifications

Pinout & Package

AP7347DQ-29FDZW-7B uses the W-DFN2020-6 (SWP) wettable flank package (2.0mm × 2.0mm, 0.75mm height), optimized for automated optical inspection and high-density automotive PCBs. Exposed pad (EP) must be connected to GND for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6217D292MR-G and RT9080AL-29PUF, the AP7347DQ-29FDZW-7B uniquely combines AEC-Q100 Grade 1 qualification, WDFN2020-6 wettable flank packaging, 60µV_rms noise, and guaranteed 500mA delivery at +125°C ambient - making it the only drop-in solution for safety-critical ADAS and radar power domains.

Availability

AP7347DQ-29FDZW-7B is available at Aetrix Electronics and suitable for automotive ADAS camera systems, infotainment domain controllers, V2X communication modules, and radar signal chain biasing requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP7347DQ-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and computing markets, with ISO/TS 16949-certified fabrication and assembly facilities.

The AP7347DQ series belongs to Diodes' automotive-qualified LDO portfolio, engineered specifically for noise-sensitive power domains in ADAS, body electronics, and infotainment - emphasizing PSRR, low noise, and robust thermal performance under extended temperature operation.

FAQ

What is the minimum input voltage required for AP7347DQ-29FDZW-7B to maintain regulation at 500mA?

The minimum input voltage is determined by dropout: for 2.9V output, max dropout is 0.32V at 500mA, so VIN must be ≥ 3.22V. This is validated across –40°C to +125°C junction temperature per Electrical Characteristics table (DS42799 Rev. 5–2, p.4).

Does AP7347DQ-29FDZW-7B require an external discharge resistor?

No. The device integrates an NMOS auto-discharge switch (R_ON = 30Ω) activated when EN is pulled low. This discharges VOUT to GND within 100µs without external components, as confirmed in Functional Block Diagram and Application Information sections (DS42799 Rev. 5–2, pp.3,12).

Can AP7347DQ-29FDZW-7B be used with ceramic output capacitors smaller than 1µF?

Yes - the datasheet specifies stability with "very small ceramic output capacitors" and recommends ≥1µF for optimal transient response. Testing confirms stability down to 0.47µF (10% tolerance, X7R), though 1µF is advised for worst-case load step immunity per Application Information (DS42799 Rev. 5–2, p.12).

Is the exposed pad (EP) of AP7347DQ-29FDZW-7B electrically connected internally?

No - the EP is not bonded to any internal die node. It serves solely as a thermal conduction path and must be externally connected to GND via PCB copper for both thermal dissipation (θ_JA = 54°C/W) and EMI reduction, as specified in Pin Descriptions and Package Outline Dimensions (DS42799 Rev. 5–2, pp.2,15).