Diodes Incorporated AP74700QW6-7

Overview

AP74700Q from Diodes Incorporated is an AEC-Q100 Grade 1 automotive ideal diode controller that implements reverse-polarity protection and ORing functionality using an external n-channel MOSFET. It supports ±65V input voltage range (3.2V startup), regulates forward voltage drop to 20mV, blocks reverse current in <0.75µs, and operates across -40°C to +125°C ambient. Used in 12V/24V battery systems for infotainment, ADAS cameras, and lighting.

For engineers reviewing the AP74700Q datasheet, AP74700Q pinout, AP74700Q application, or AP74700Q equivalent, key selection criteria include its -65V reverse voltage tolerance, 20mV regulated forward drop, fast reverse blocking response, charge pump–driven gate control, and SOT26 package compatibility with automotive transient immunity requirements (ISO 7637-2, ISO 16750-2).

Technical Context

The AP74700Q employs a transconductance error amplifier to regulate ANODE-to-CATHODE voltage at 20mV in light-load conduction mode, switching to full gate drive (VCP-connected GATE) above 50mV for low-R_DS(ON) operation. Its internal charge pump delivers up to 15V gate-to-ANODE drive while sustaining UVLO hysteresis (440–670mV) and EN hysteresis (0.52–1.50V).

Reverse current detection triggers GATE-to-ANODE shorting within 0.75µs, eliminating DC reverse flow. The device enters shutdown at EN < 1.05V, drawing only 0.7µA, and withstands -65V ANODE-to-GND - enabling direct integration into harsh automotive battery rails without external level-shifting.

Key Specifications

Pinout & Package

AP74700Q is housed in a 6-pin SOT26 package (3.0mm × 1.7mm × 1.1mm, 0.95mm pitch), optimized for high-density automotive PCB layouts and thermal performance (R_θJA = 130°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ideal diode controller applications.

Compared with LM74700QDRRRQ1 and TPS26600PWPR, the AP74700Q uniquely combines ±65V reverse tolerance, 20mV regulation, and charge-pump–driven n-MOSFET control - making it the only solution qualified for full automotive battery rail protection including cold-crank, load dump, and reverse-battery fault conditions.

Availability

AP74700Q is available at Aetrix Electronics and suitable for automotive infotainment clusters, ADAS camera modules, and exterior lighting systems requiring stable component supply across extended temperature ranges and stringent transient immunity.

Supply support for AP74700Q 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 wafer fabrication and assembly facilities.

The AP74700Q belongs to Diodes' automotive-grade ideal diode controller product line, engineered specifically for reverse-polarity and ORing protection in 12V/24V battery systems subject to ISO 7637-2 and ISO 16750-2 transients.

FAQ

What external MOSFET parameters are critical for AP74700Q design?

Select an n-channel MOSFET with V_DS(max) ≥ 60V (to stay within AP74700Q's 65V anode–cathode limit), V_GS(th) ≤ 13V (since AP74700Q drives up to 15V), and R_DS(ON) sized so nominal load yields 20–50mV V_DS. Body diode SOA must handle cold-crank inrush; recommended R_DS(ON) = 20mV/I_LOAD(NOM) to 50mV/I_LOAD(NOM).

How does AP74700Q handle ISO 7637-2 Pulse 5a (load dump)?

The AP74700Q itself withstands up to +65V on ANODE and -65V on CATHODE, but load dump clamping requires an external TVS diode rated for ISO 7637-2 Pulse 5a (e.g., 33V standoff, 500W peak). The controller remains functional during clamping due to its wide input range and internal UVLO hysteresis, ensuring uninterrupted gate control.

Can EN pin be tied directly to ANODE for always-on operation?

Yes - EN tolerates -65V to +60V relative to GND and can be directly connected to ANODE. When floating, internal 3µA sink pulls EN low, disabling the device. For always-on use, tie EN to ANODE through a 10kΩ resistor or directly; ensure EN voltage exceeds VIH_EN (min 1.3V) across the full operating temperature range.

Why does AP74700Q use a charge pump instead of a linear regulator for gate drive?

A charge pump generates a boosted gate voltage (up to 15V) referenced to ANODE, enabling full enhancement of low-R_DS(ON) n-channel MOSFETs. This avoids the conduction loss and thermal limitations of p-channel MOSFETs or the complexity of external high-side drivers - delivering superior efficiency and reliability in automotive power paths.