AP65402SP-13 Equivalent & Substitute Parts

Part Overview

The AP65402SP-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable output applications. This device delivers 4A output current with an adjustable output range from 0.8V to 12V, operating from a 4.75V to 17V input supply. The part is housed in an 8-SOIC package with exposed pad and features synchronous rectification at 500kHz switching frequency.

The AP65402SP-13 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute devices must maintain functional compatibility across electrical specifications, package form factor, and thermal operating ranges.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive Adjustable
Output Voltage Range	0.8V to 12V
Output Current	4A
Input Voltage Range	4.75V to 17V
Switching Frequency	500kHz
Synchronous Rectifier	Yes
Package	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Operating Temperature	-40°C to 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Topology: Buck switching regulator
Output Configuration: Positive adjustable
Package: 8-SOIC (0.154", 3.90mm Width) Exposed Pad
Synchronous Rectifier: Yes
Output Voltage Range: Minimum 0.8V, maximum at least 12V
RoHS3 Compliance

Functional Compatibility Parameters:

Input voltage range must encompass or exceed 4.75V to 17V
Output current must be equal to or greater than 4A
Operating temperature range must support -40°C to 85°C minimum
Switching frequency is not a limiting factor for substitution

Substitute parts are grouped into two categories based on output current capability:

Category 1 - Full Current Rating (4A): MP8715DN-LF-Z provides equivalent 4A output current with extended input voltage range (4.5V to 21V) and higher maximum output voltage (21V).

Category 2 - Reduced Current Rating (2A-3A): RT7237BHGSP, RT7237CHGSP, RT7247BHGSP, RT7247CHGSP, RT7257BHZSP, RT7257BLZSP, RT7257GHZSP, RT7257GLZSP, and RT7297BHZSP provide 2A or 3A output current. These are suitable for applications where the full 4A is not required or where design margins permit operation at reduced current levels.

Parameter Comparison

Parameter	AP65402SP-13	MP8715DN-LF-Z	RT7237BHGSP	RT7237CHGSP	RT7247BHGSP	RT7247CHGSP	RT7257BHZSP	RT7257BLZSP	RT7257GHZSP	RT7257GLZSP	RT7297BHZSP
Manufacturer	Diodes Inc.	MPS	Richtek	Richtek	Richtek	Richtek	Richtek	Richtek	Richtek	Richtek	Richtek
Function	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable	Positive Adjustable
Output Voltage Range	0.8V to 12V	0.8V to 21V	0.8V to 12V	0.8V to 12V	0.8V to 12V	0.8V to 12V	0.8V to 12V	0.8V to 12V	0.8V to 12V	0.8V to 12V	0.8V to 12V
Output Current	4A	4A	2A	2A	2A	2A	3A	3A	3A	3A	3A
Input Voltage Range	4.75V to 17V	4.5V to 21V	4.5V to 18V	4.5V to 18V	4.5V to 18V	4.5V to 18V	4.5V to 18V	4.5V to 18V	4.5V to 18V	4.5V to 18V	4.5V to 18V
Switching Frequency	500kHz	500kHz	1.2MHz	800kHz	1.2MHz	800kHz	1.2MHz	1.2MHz	800kHz	800kHz	1.2MHz
Synchronous Rectifier	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Package	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad
Operating Temperature	-40°C to 85°C	-40°C to 125°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - Full Current Compatibility:

MP8715DN-LF-Z (Monolithic Power Systems Inc.) is the recommended primary substitute for direct replacement in applications requiring the full 4A output current specification. This device maintains identical output current rating, package form factor, and synchronous rectification topology. The MP8715DN-LF-Z provides extended input voltage range (4.5V to 21V) and higher maximum output voltage capability (21V), offering superior design margin. Operating temperature range extends to 125°C junction temperature, providing enhanced thermal performance. All regulatory compliance requirements (ROHS3, REACH Unaffected, EAR99) are met. Product status is active with established supply availability.

Secondary Substitutes - Reduced Current Applications:

Richtek RT7257 series devices (RT7257BHZSP, RT7257BLZSP, RT7257GHZSP, RT7257GLZSP) and RT7297BHZSP provide 3A output current and are suitable for applications where design requirements permit operation below the original 4A specification. These devices maintain identical package, output voltage range, and operating temperature compatibility. Switching frequency variants (800kHz and 1.2MHz) are available to support different EMI and efficiency requirements. All devices are active products with robust inventory levels.

Richtek RT7237 and RT7247 series devices (RT7237BHGSP, RT7237CHGSP, RT7247BHGSP, RT7247CHGSP) provide 2A output current and are applicable only to applications with reduced current demands. These devices maintain full electrical and mechanical compatibility within their current rating specification.

Frequently Asked Questions (FAQ)

Q: Can MP8715DN-LF-Z directly replace AP65402SP-13 without circuit modification?

A: Yes. MP8715DN-LF-Z maintains identical package, output voltage range (0.8V to 12V), output current (4A), and synchronous rectification topology. The extended input voltage range and higher maximum output voltage provide additional design margin. No circuit modifications are required for direct substitution.

Q: What is the difference between RT7257BHZSP and RT7257GHZSP?

A: Both devices provide 3A output current in 8-SOIC package with identical electrical specifications. The primary difference is switching frequency: RT7257BHZSP operates at 1.2MHz while RT7257GHZSP operates at 800kHz. Selection depends on EMI requirements and efficiency optimization for the specific application.

Q: Can RT7237 or RT7247 series devices be used as substitutes?

A: RT7237 and RT7247 series devices are mechanically and electrically compatible but provide only 2A output current compared to the original 4A specification. These are suitable only for applications where the design does not require the full 4A output current capability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the significance of the operating temperature range difference between AP65402SP-13 and MP8715DN-LF-Z?

A: AP65402SP-13 specifies -40°C to 85°C ambient temperature (TA), while MP8715DN-LF-Z specifies -40°C to 125°C junction temperature (TJ). The MP8715DN-LF-Z provides extended thermal performance margin, allowing operation in higher ambient temperature environments or with reduced thermal management requirements.

Q: Are packaging variants (Cut Tape, Tape & Reel, Digi-Reel) functionally equivalent?

A: Yes. Packaging variants (Cut Tape, Tape & Reel, Digi-Reel) represent different supply formats for the same electrical device. All variants of a given part number are functionally identical and electrically equivalent. Selection depends on procurement and assembly process requirements.

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