AP6502SP-13 Equivalent & Substitute Parts

Part Overview

The AP6502SP-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive adjustable output voltage regulation in power management applications. This device delivers 2A output current with an adjustable output range from 0.925V to 16V, operating from a 4.7V to 18V input supply. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting or exceeding the electrical and mechanical specifications of the original component.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Type	Adjustable
Output Configuration	Positive
Number of Outputs	1
Voltage - Input (Min)	4.7V
Voltage - Input (Max)	18V
Voltage - Output (Min/Fixed)	0.925V
Voltage - Output (Max)	16V
Current - Output	2A
Frequency - Switching	340kHz
Synchronous Rectifier	Yes
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the AP6502SP-13 are selected based on the following critical parameters that determine functional compatibility:

Core Electrical Parameters:

Buck topology with positive adjustable output
Minimum output voltage of 0.925V
Switching frequency of 340kHz
Synchronous rectifier topology
8-SOIC package with exposed pad

Substitution Logic: Parts are considered equivalent when they maintain the same topology, output adjustability range, switching frequency, and package footprint. Output current capacity may exceed the original specification (2A) without compromising compatibility, as higher current ratings provide design margin. Input voltage ranges may be extended beyond the original 4.7V–18V specification, provided the minimum input voltage does not fall below 4.7V and the maximum does not exceed 27V for safe operation in the intended application. Operating temperature ranges may differ; however, the -40°C to 85°C specification of the original part establishes the baseline requirement for industrial applications.

Parameter Comparison

Parameter	AP6502SP-13	LSP5527-S8A	RT8250GSP	RT8290GSP
Manufacturer	Diodes Incorporated	Diodes Incorporated	Richtek USA Inc.	Richtek USA Inc.
Product Status	Obsolete	Active	Active	Active
Function	Step-Down	Step-Down	Step-Down	Step-Down
Output Type	Adjustable	Adjustable	Adjustable	Adjustable
Output Configuration	Positive	Positive	Positive	Positive
Number of Outputs	1	1	1	1
Voltage - Input (Min)	4.7V	4.5V	4.5V	4.5V
Voltage - Input (Max)	18V	27V	23V	23V
Voltage - Output (Min/Fixed)	0.925V	0.925V	0.925V	0.925V
Voltage - Output (Max)	16V	21.6V	20V	20V
Current - Output	2A	2A	3A	3A
Frequency - Switching	340kHz	340kHz	340kHz	340kHz
Synchronous Rectifier	Yes	Yes	Yes	Yes
Package / Case	8-SOIC (0.154", 3.90mm Width) Exposed Pad	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width) Exposed Pad	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)	-20°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LSP5527-S8A (Diodes Incorporated): This part is an active product from the original manufacturer, providing direct design continuity. It maintains identical output current (2A) and switching frequency (340kHz) specifications. The extended input voltage range (4.5V–27V) and higher maximum output voltage (21.6V) provide broader application flexibility. The part is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain stability. The operating temperature range extends to 125°C (TJ), exceeding the original specification. This part is the primary recommendation for direct replacement in existing designs.

RT8250GSP (Richtek USA Inc.): This substitute offers increased output current capacity (3A) compared to the original 2A specification, providing additional design margin for power delivery. The 8-SOIC package with exposed pad matches the original footprint precisely. Operating temperature range (-40°C to 85°C) aligns with the original part. Input voltage range extends to 23V maximum. The part is ROHS3 compliant and maintains active product status. This option is suitable for applications requiring higher current capability within the same thermal envelope.

RT8290GSP (Richtek USA Inc.): This part provides identical electrical specifications to the RT8250GSP, including 3A output current and matching operating temperature range. The 8-SOIC package with exposed pad maintains footprint compatibility. Input voltage specifications (4.5V–23V) and output voltage range (0.925V–20V) are equivalent to the RT8250GSP. ROHS3 compliance and active product status are confirmed. This option serves as an alternative Richtek solution with equivalent performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the LSP5527-S8A be used as a direct replacement for the AP6502SP-13?

A: Yes. The LSP5527-S8A maintains identical output current (2A), switching frequency (340kHz), adjustable output voltage range (0.925V minimum), and 8-SOIC package footprint. Both parts are ROHS3 compliant. The LSP5527-S8A is an active product, addressing the obsolescence of the original AP6502SP-13.

Q: What is the advantage of using RT8250GSP or RT8290GSP over LSP5527-S8A?

A: The Richtek parts (RT8250GSP and RT8290GSP) provide 3A output current compared to the 2A specification of both the original part and LSP5527-S8A. This higher current rating offers additional design margin and thermal headroom in power delivery applications. Both Richtek options maintain the same 340kHz switching frequency and 8-SOIC package compatibility.

Q: Are there package compatibility concerns when substituting these parts?

A: All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package. The LSP5527-S8A uses standard 8-SOIC without exposed pad, while RT8250GSP and RT8290GSP include exposed pad variants. PCB layouts designed for the original AP6502SP-13 (with exposed pad) are compatible with RT8250GSP and RT8290GSP. Designs using LSP5527-S8A may require thermal pad handling adjustments if the original layout included exposed pad connections.

Q: Do all substitute parts meet the same compliance standards as the original AP6502SP-13?

A: Yes. All substitute parts (LSP5527-S8A, RT8250GSP, and RT8290GSP) are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status. All parts carry EAR99 ECCN classification and identical HTSUS codes.

Q: What is the operating temperature difference between LSP5527-S8A and the other substitutes?

A: The LSP5527-S8A operates from -20°C to 125°C (TJ), while the original AP6502SP-13, RT8250GSP, and RT8290GSP operate from -40°C to 85°C (TA). For applications requiring operation below -20°C, the Richtek parts (RT8250GSP, RT8290GSP) or original AP6502SP-13 specification should be verified against actual thermal requirements.

Q: Can output current be increased by using a higher-rated substitute part?

A: Yes, within design constraints. The RT8250GSP and RT8290GSP provide 3A output current versus the original 2A specification. However, increased current delivery requires verification of thermal management, PCB trace sizing, and input supply capacity. The higher current rating does not automatically increase system performance; it must be matched to application requirements and thermal design.

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