RT9214CPS Equivalent & Substitute Parts

Part Overview

The RT9214CPS is a buck regulator positive output step-down DC-DC controller IC manufactured by Richtek USA Inc. in an 8-SOP package. This component functions as a transistor driver for step-down voltage conversion with a single output phase and 100% maximum duty cycle capability. The RT9214CPS is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support.

Substiute Parts

RT9214CPS

Richtek USA Inc.In Stock: 4209RT9214CPS Datasheet

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RT8120FGS

Richtek USA Inc.In Stock: 725RT8120FGS Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete RT9214CPS is based on the following critical parameters that must align between the main part and substitute candidates:

• Topology & Function: Buck regulator with step-down DC-DC controller operation
• Output Configuration: Positive output with single phase
• Switching Frequency: 300kHz operation
• Package Compatibility: 8-SOIC (0.154", 3.90mm Width) form factor
• Synchronous Rectifier: Integrated synchronous rectification capability
• Operating Temperature Range: -40°C ~ 85°C
• Compliance Standards: ROHS3 compliance and MSL 3 rating

The RT8120FGS meets these core substitution criteria while offering an active product status and extended supply voltage range.

Parameter Comparison

Engineering Selection Recommendations

The RT8120FGS serves as an active substitute for the obsolete RT9214CPS based on functional equivalence and compliance alignment. Both components share identical package geometry, switching frequency, synchronous rectification capability, and thermal operating range. The RT8120FGS maintains ROHS3 compliance and MSL 3 rating, ensuring compatibility with current manufacturing and environmental standards.

The RT8120FGS provides an extended supply voltage input range (3V ~ 13.2V) compared to the fixed 12V specification of the RT9214CPS, offering greater design flexibility. The maximum duty cycle specification differs (85% versus 100%), which must be evaluated against specific application requirements. The RT8120FGS includes an additional Enable control feature not present in the RT9214CPS.

Selection of the RT8120FGS is supported by its active product status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the RT8120FGS directly replace the RT9214CPS in existing designs?

A: The RT8120FGS shares the same 8-SOIC package footprint, switching frequency, and core buck regulator topology. Pin-level compatibility and control signal requirements must be verified against the specific application schematic. The extended input voltage range and additional Enable feature of the RT8120FGS may require circuit evaluation.

Q: What is the significance of the duty cycle difference between these parts?

A: The RT9214CPS supports 100% maximum duty cycle, while the RT8120FGS supports 85% maximum duty cycle. This parameter affects the minimum output voltage achievable relative to input voltage. Applications requiring operation at or near 100% duty cycle must confirm compatibility with the RT8120FGS specification.

Q: Are both parts compliant with current environmental and regulatory standards?

A: Both the RT9214CPS and RT8120FGS are ROHS3 compliant and carry MSL 3 (168 Hours) moisture sensitivity ratings, meeting current manufacturing and environmental requirements.

Q: Why is the RT9214CPS classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and support. The RT8120FGS, as an active product from the same manufacturer, provides ongoing availability and technical support for new designs and production continuity.

Q: What additional control features does the RT8120FGS provide?

A: The RT8120FGS includes an Enable control feature in addition to Phase Control, providing enhanced operational flexibility compared to the RT9214CPS Phase Control-only configuration.