RT8128AGSP Equivalent & Substitute Parts

Part Overview

The RT8128AGSP 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 transistor driver with step-down topology, delivering a single positive output phase. The device is actively produced and widely stocked, with 3345 units available in new original condition. Finding equivalent substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate alternative sourcing requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

RT8128AGSP

Richtek USA Inc.In Stock: 3412RT8128AGSP Datasheet

Current PartRFQ

RT8128CGSP

Richtek USA Inc.In Stock: 4586RT8128CGSP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The RT8128AGSP belongs to the Richtek RT8128 buck regulator controller family. Substitute parts within this family are determined by strict electrical and mechanical parameter matching across the following criteria:

Electrical Parameters: Supply voltage range (4.5V ~ 13.2V), switching frequency (300kHz), output topology (positive step-down buck), synchronous rectifier capability, clock sync functionality, and control features (Enable, Power Good) must remain identical.

Mechanical Parameters: Package type (8-SOIC with exposed pad), mounting method (surface mount), and physical dimensions (0.154" width, 3.90mm) must be preserved.

Environmental & Compliance Parameters: Operating temperature range (-40°C ~ 85°C), RoHS3 compliance, MSL rating (3), and REACH status must match.

The RT8128CGSP meets all these criteria and is classified as a parametric equivalent within the RT8128 base product family.

Parameter Comparison

Engineering Selection Recommendations

Both the RT8128AGSP and RT8128CGSP are active products from Richtek USA Inc. with identical electrical specifications, mechanical packaging, and compliance certifications. Selection between these parts is based on availability and supply chain requirements rather than technical differentiation.

The RT8128AGSP maintains 3345 units in new original stock. The RT8128CGSP provides an alternative source with 4537 units available. Both parts carry ROHS3 compliance, REACH unaffected status, and identical MSL ratings, making them suitable for equivalent substitution in applications requiring step-down buck regulation with positive output topology.

Frequently Asked Questions (FAQ)

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

A: Yes. The RT8128CGSP is a parametric equivalent with identical electrical specifications, output topology, supply voltage range, switching frequency, control features, and package configuration. Direct substitution is supported without circuit modification.

Q: Are there any differences in packaging between these parts?

A: Both parts use the 8-SOIC package with exposed pad and identical physical dimensions (0.154" width, 3.90mm). The RT8128AGSP is supplied in Cut Tape (CT) & Digi-Reel packaging, while the RT8128CGSP is supplied in Cut Tape (CT) packaging. This difference affects handling and storage but not electrical or mechanical compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the RT8128AGSP and RT8128CGSP are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings of 3 (168 Hours). They meet the same environmental and regulatory requirements.

Q: What determines substitution eligibility for RT8128 buck regulators?

A: Substitution eligibility is determined by matching supply voltage range (4.5V ~ 13.2V), switching frequency (300kHz), output topology (positive step-down), synchronous rectifier capability, clock sync functionality, control features (Enable, Power Good), operating temperature range (-40°C ~ 85°C), package type (8-SOIC with exposed pad), and compliance certifications (ROHS3, REACH status).

Q: Can these parts be used in applications requiring different switching frequencies?

A: No. Both parts operate at a fixed 300kHz switching frequency. Applications requiring different switching frequencies require alternative controller ICs outside the RT8128 family.