RT8290GSP Buck Switching Regulator Equivalent & Substitute Parts

Part Overview

The RT8290GSP is a buck switching regulator IC manufactured by Richtek USA Inc., designed for positive adjustable output applications. This Power Management (PMIC) component delivers 3A output current with an adjustable voltage range from 0.925V to 20V, operating from a 4.5V to 23V input supply. The device features synchronous rectification and operates at 340kHz switching frequency in an 8-SOIC package with exposed pad.

The RT8290GSP maintains Active product status. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and functional equivalence within the buck regulator category.

Key Parameters

Parameter	Value
Manufacturer	Richtek USA Inc.
Part Number	RT8290GSP
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Configuration	Positive Adjustable
Output Current	3A
Input Voltage Range	4.5V to 23V
Output Voltage Range	0.925V to 20V
Switching Frequency	340kHz
Synchronous Rectifier	Yes
Package	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Operating Temperature	-40°C to 85°C (TA)
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the RT8290GSP is determined by the following critical parameters:

Primary Matching Criteria:

Output current capability: 3A minimum
Package type: 8-SOIC (0.154", 3.90mm Width) with exposed pad
Topology: Buck switching regulator
Output configuration: Positive adjustable
Synchronous rectification: Required
Minimum output voltage: 0.925V or lower
Maximum output voltage: 20V or higher
Input voltage range overlap: Minimum 4.5V to 23V compatibility

Secondary Compatibility Factors:

Switching frequency: 340kHz nominal (tolerance acceptable)
Operating temperature range: -40°C minimum to 85°C minimum
RoHS3 compliance
Surface mount technology

The substitute parts listed below meet the primary matching criteria and maintain functional equivalence within the specified electrical and mechanical parameters.

Parameter Comparison

Parameter	RT8290GSP (Richtek)	AP6502SP-13 (Diodes)	AP6503SP-13 (Diodes)	ST1S10PHR (STMicroelectronics)
Manufacturer	Richtek USA Inc.	Diodes Incorporated	Diodes Incorporated	STMicroelectronics
Output Current	3A	2A	3A	3A
Input Voltage (Min)	4.5V	4.7V	4.7V	2.5V
Input Voltage (Max)	23V	18V	23V	18V
Output Voltage (Min)	0.925V	0.925V	0.925V	0.8V
Output Voltage (Max)	20V	16V	20V	16.2V
Switching Frequency	340kHz	340kHz	340kHz	900kHz
Synchronous Rectifier	Yes	Yes	Yes	Yes
Package	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad	8-SOIC Exposed Pad
Operating Temperature	-40°C to 85°C (TA)	-40°C to 85°C (TA)	-40°C to 85°C (TA)	-40°C to 125°C (TJ)
Product Status	Active	Obsolete	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AP6502SP-13 (Diodes Incorporated): This substitute provides 2A output current, which is below the RT8290GSP specification of 3A. While the package, topology, and adjustable output voltage range match, the reduced current capability limits its application to designs requiring 2A or less. Input voltage maximum is limited to 18V versus 23V for the RT8290GSP. Product status is Obsolete, indicating limited future availability.

AP6503SP-13 (Diodes Incorporated): This substitute matches the RT8290GSP in output current (3A), output voltage range (0.925V to 20V), and input voltage range (4.7V to 23V). Package and switching frequency are identical. Operating temperature range matches the RT8290GSP specification. Product status is Obsolete, which may impact long-term supply chain reliability and procurement timelines.

ST1S10PHR (STMicroelectronics): This substitute meets the 3A output current requirement and maintains the 8-SOIC package compatibility. The switching frequency is higher at 900kHz. Input voltage range is limited to 2.5V to 18V, with maximum output voltage of 16.2V, both below the RT8290GSP specifications. Operating temperature range extends to 125°C (TJ), exceeding the RT8290GSP requirement. Product status is Active, supporting long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can AP6502SP-13 directly replace RT8290GSP in all applications?

A: No. The AP6502SP-13 is rated for 2A maximum output current, while the RT8290GSP delivers 3A. Direct substitution is only valid for designs requiring 2A or less. Additionally, the maximum input voltage is limited to 18V compared to 23V for the RT8290GSP.

Q: What is the primary limitation of AP6503SP-13 as a substitute?

A: The AP6503SP-13 is electrically equivalent to the RT8290GSP in current, voltage, and frequency specifications. The primary limitation is its Obsolete product status, which may restrict availability and future procurement options.

Q: Is ST1S10PHR suitable for applications requiring 20V output?

A: No. The ST1S10PHR maximum output voltage is 16.2V, which is below the RT8290GSP maximum of 20V. Applications requiring output voltages above 16.2V require the RT8290GSP or AP6503SP-13.

Q: Does the higher switching frequency of ST1S10PHR affect compatibility?

A: The ST1S10PHR operates at 900kHz versus 340kHz for the RT8290GSP. While both are buck regulators with identical packages, the higher switching frequency may affect filter component selection, PCB layout, and electromagnetic interference characteristics. Design verification is necessary for frequency-sensitive applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The RT8290GSP and all listed substitute parts (AP6502SP-13, AP6503SP-13, ST1S10PHR) are ROHS3 Compliant.

Q: Which substitute offers the best long-term availability?

A: The ST1S10PHR maintains Active product status, indicating ongoing manufacturing and supply chain support. Both Diodes Incorporated substitutes (AP6502SP-13 and AP6503SP-13) are marked Obsolete, which may limit future procurement.

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