RT8128CGSP Equivalent & Substitute Parts

Part Overview

The RT8128CGSP is an active Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Richtek USA Inc. This Power Management IC operates as a PWM controller in an 8-SOP-EP package and is designed for step-down voltage conversion applications. The device features synchronous rectification and clock synchronization capabilities, making it suitable for efficient power delivery in embedded systems and industrial applications. With 4537 units in current stock and active product status, the RT8128CGSP remains available for new designs. Equivalent substitute parts may be required due to supply constraints, design revisions, or procurement optimization.

Substiute Parts

RT8128CGSP

Richtek USA Inc.In Stock: 4586RT8128CGSP Datasheet

Current PartRFQ

RT8128AGSP

Richtek USA Inc.In Stock: 3412RT8128AGSP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The RT8128CGSP has one parametric equivalent substitute: RT8128AGSP. Both parts share identical electrical and mechanical specifications that define substitutability within the RT8128 controller family. The substitution is valid based on the following critical parameters:

• Identical topology (Buck regulator, step-down configuration)
• Matching voltage supply range (4.5V ~ 13.2V)
• Same switching frequency (300kHz)
• Identical control features (Enable, Power Good)
• Matching operating temperature range (-40°C ~ 85°C)
• Same package specification (8-SOIC with exposed pad)
• Identical synchronous rectifier and clock sync capabilities
• Equivalent RoHS3 compliance and MSL rating

Both parts are manufactured by Richtek USA Inc. and maintain the same base product number (RT8128), confirming their functional equivalence for direct substitution in circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Both RT8128CGSP and RT8128AGSP are active products with full RoHS3 compliance and equivalent MSL ratings. Selection between these parts should be based on procurement availability and lead time requirements. The RT8128CGSP currently maintains higher inventory (4537 units) compared to RT8128AGSP (3345 units), making it the primary choice for immediate availability. Both parts are suitable for new designs and existing production environments. The identical electrical specifications, package configuration, and compliance certifications ensure seamless interchangeability without circuit redesign or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can RT8128AGSP be used as a direct replacement for RT8128CGSP?

A: Yes. Both parts are parametrically equivalent with identical electrical characteristics, switching frequency, control features, operating temperature range, and package specifications. Direct substitution is valid without circuit modification.

Q: Are there any differences in the package or mounting requirements?

A: No. Both parts use the same 8-SOIC package with exposed pad (0.154" width, 3.90mm) and surface mount configuration. PCB layout and assembly processes remain unchanged.

Q: Do both parts meet the same compliance standards?

A: Yes. Both RT8128CGSP and RT8128AGSP are ROHS3 compliant with identical MSL ratings of 3 (168 Hours). They meet equivalent environmental and regulatory requirements.

Q: What is the difference between the part numbers?

A: The part numbers differ only in the grade designation (C vs. A). Both maintain the same base product number (RT8128) and are functionally equivalent controllers from Richtek USA Inc.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection should be based on current inventory availability and procurement lead times. Both are active products with equivalent technical specifications.

Q: Are there any thermal or performance differences?

A: No. Both parts operate across the same temperature range (-40°C ~ 85°C) and maintain identical switching frequency (300kHz) and control capabilities.