Diodes Incorporated AP7347DQ-12FDZW-7B

Overview

AP7347DQ-12FDZW-7B from Diodes Incorporated is an automotive-grade 500mA low-dropout linear regulator with fixed 1.2V 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 - designed for noise-sensitive power domains in ADAS cameras and infotainment systems.

For engineers reviewing the AP7347DQ-12FDZW-7B datasheet, AP7347DQ-12FDZW-7B pinout, AP7347DQ-12FDZW-7B application, or AP7347DQ-12FDZW-7B equivalent, key selection criteria include AEC-Q100 qualification, WDFN2020-6 wettable flank package thermal performance (θ_JA = 54°C/W), dropout voltage ≤0.65V at 500mA (for V_OUT = 1.2V), and guaranteed operation from –40°C to +125°C ambient.

Technical Context

The AP7347DQ-12FDZW-7B integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and NMOS pass transistor with auto-discharge capability. Its internal architecture enables fast load transient response (<10µs settling) and stable regulation across 1.7V–5.5V input range while maintaining <22.5mV load regulation (1mA–500mA).

It implements dual-threshold enable logic (V_EN(H) ≥ 1.25V, V_EN(L) ≤ 0.5V), thermal shutdown at +170°C with +20°C hysteresis, and fold-back short-circuit current limiting (~180mA). The device supports ceramic output capacitors ≥1µF and requires no external compensation.

Key Specifications

Pinout & Package

AP7347DQ-12FDZW-7B uses the W-DFN2020-6 (SWP) wettable flank package (2.0mm × 2.0mm × 0.75mm), optimized for automated optical inspection (AOI) and thermal dissipation via exposed pad (EP).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS74901DRVR and NCP114AMX120TBG, the AP7347DQ-12FDZW-7B uniquely combines AEC-Q100 compliance, wettable flank packaging, auto-discharge, and 75dB PSRR - making it the only drop-in solution for automotive ADAS camera and infotainment POL designs requiring full production traceability and zero-defect assembly.

Availability

AP7347DQ-12FDZW-7B is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, wireless communication gateways, and C-V2X transceivers requiring stable component supply across extended temperature ranges and strict automotive quality controls.

Supply support for AP7347DQ-12FDZW-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 company specializing in discrete, analog, and mixed-signal devices, with design, manufacturing, and test facilities certified to IATF 16949 and ISO 9001 standards.

The AP7347DQ belongs to Diodes' automotive-qualified LDO portfolio, engineered specifically for power integrity in ADAS, infotainment, and vehicle networking systems where low noise, high PSRR, and AEC-Q100 reliability are mandatory.

FAQ

What is the thermal performance of AP7347DQ-12FDZW-7B in its W-DFN2020-6 package?

The W-DFN2020-6 (SWP) package delivers θ_JA = 54°C/W and θ_JC = 20°C/W on a standard JEDEC 4-layer board with 2oz copper and thermal vias to inner ground planes. With a 100mm² EP copper area connected to GND, junction temperature rise is limited to ≤54°C at 500mA output under 25°C ambient - enabling continuous operation in sealed enclosures up to +71°C ambient.

Does AP7347DQ-12FDZW-7B require an external discharge FET?

No. The device integrates an internal 30Ω NMOS transistor between VOUT and GND that activates automatically when EN is pulled low. This provides full VOUT discharge within 100µs, eliminating need for external components and reducing BOM count in space-constrained automotive modules.

Can AP7347DQ-12FDZW-7B operate with a 1.5V input voltage?

No. Minimum input voltage is 1.7V per datasheet specifications. At 1.2V output, the minimum functional VIN is 1.85V (accounting for 0.65V typical dropout). Operation below 1.7V violates absolute maximum ratings and may cause regulation loss or undefined behavior.

Is the NC pin on AP7347DQ-12FDZW-7B electrically isolated?

Yes. Pins 2 and 5 are internally unconnected. Diodes Incorporated recommends tying them to GND to maximize PCB copper area for thermal conduction and reduce EMI coupling - but they carry no electrical signal or bias and pose no risk if left floating.