AP74502Q, AP74502HQ

Document number: DS47093 Rev. 1 - 2

1 of 22

www.diodes.com

April 2025

© 2025 Copyright Diodes Incorporated. All Rights Reserved.

AP74502Q, AP74502HQ

, AP

LOW IQ REVERSE BATTERY POLARITY AND OVERVOLTAGE PROTECTION CONTROLLER

Description

The AP74502Q, AP74502HQ is an automotive AEC-Q100 qualified

reverse battery polarity and overvoltage protection controller, which

operates with 2 of external N-channel MOSFETs.

The AP74502Q, AP74502HQ is for input protection of 12V/24V/48V

automotive systems. The input voltage support as low as 3.2V is

particularly for severe cold crank requirements in automotive

systems and up to 75V.

The AP74502Q, AP74502HQ controller provides a charge pump

gate drive for an external Back to Back N-channel MOSFETs with the

enable pin low, the controller is off and draws

approximately 1μA of

current.

The AP74502Q, AP74502HQ is available in SOT28 package.

Applications

•

Automotive body control units

•

Automotive infotainment systems

– head units, telematics

control units

•

Automotive ADAS systems

– cameras

•

Power of industrial automation such as PLC

•

Enterprise power supplies

Pin Assignments

(Top View)

EN/UVLO

OVLO

SRC

GATE

VIN

GND

NC

VCP

1

2

3

4

5

6

7

8

SOT28

Features

•

Input Voltage Ranges from 3.2V to 80V (3.9V Start-Up)

•

-80V Reverse Battery Voltage

•

Charge Pump for External N-ch Power MOSFETs

•

Drives External Back to Back N-ch MOSFETs

•

Gate Driver Strength Option

•

AP74502Q: 60

μA Peak Gate Source

•

AP74502HQ: 11mA Peak Gate Source

•

Low Shutdown Current of 0.9µA When Disabled

•

Low Quiescent Current of 62µA When Enabled

•

2.3A Peak Gate Turn-Off Current

•

ESD Protection: 2kV of HBM and 750V of CDM

•

AEC-Q100 Qualification Compliance with Device Temperature

Grade 1 (-40°C to +125°C Ambient Operating Temperature

Range)

•

8-Pin SOT28 Package

•

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

•

Halogen and Antimony Free. “Green” Device (Note 3)

•

The AP74502Q, AP74502HQ are suitable for automotive

applications requiring specific change control; these parts

are AEC-Q100 qualified, PPAP capable, and manufactured in

IATF16949 certified facilities.

https://www.diodes.com/quality/product-definitions/

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.

2. See https://www.diodes.com/quality/lead-

free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and

Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.