RT9214PS Equivalent & Substitute Parts

Part Overview

The RT9214PS is a buck regulator positive output step-down DC-DC controller IC manufactured by Richtek USA Inc. in an 8-SOP package. This device functions as a transistor driver for step-down voltage conversion with a single output phase and 100% maximum duty cycle capability. The RT9214PS is currently classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and production continuity.

Substiute Parts

RT9214PS

Richtek USA Inc.In Stock: 5750RT9214PS 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 RT9214PS is determined by strict alignment of the following critical parameters:

Mandatory Matching Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) — ensures PCB layout compatibility
• Output Type: Transistor Driver — maintains circuit topology compatibility
• Function: Step-Down — preserves voltage conversion direction
• Output Configuration: Positive — ensures polarity compatibility
• Topology: Buck — confirms converter architecture
• Number of Outputs: 1 — matches output channel count
• Output Phases: 1 — maintains phase configuration
• Synchronous Rectifier: Yes — preserves efficiency characteristics
• Operating Temperature Range: -40°C ~ 85°C (TA) — ensures thermal compatibility
• Switching Frequency: 300kHz — maintains timing compatibility

Allowable Parameter Variations:

• Voltage - Supply (Vcc/Vdd): Substitute must support the RT9214PS supply voltage range or broader range
• Duty Cycle (Max): Substitute may have lower maximum duty cycle if application requirements permit
• Control Features: Substitute may include additional features (e.g., Enable function) without affecting base functionality
• Product Status: Active status preferred for long-term availability

Parameter Comparison

Engineering Selection Recommendations

The RT8120FGS qualifies as a direct substitute for the RT9214PS based on the following engineering criteria:

Package and Pinout Compatibility: Both devices use the 8-SOIC (0.154", 3.90mm Width) package, ensuring direct PCB layout compatibility without redesign.

Functional Equivalence: Both devices implement identical buck converter topology with single-phase positive output, transistor driver output type, and 300kHz switching frequency. The core DC-DC controller functionality is preserved.

Supply Voltage Compatibility: The RT8120FGS supply voltage range of 3V ~ 13.2V encompasses the RT9214PS specified range of 5V and 12V, ensuring operation across all intended supply conditions.

Thermal and Environmental Compliance: Both devices operate across the identical temperature range of -40°C ~ 85°C and maintain ROHS3 compliance and MSL 3 (168 Hours) moisture sensitivity rating.

Active Product Status: The RT8120FGS is actively manufactured by Richtek USA Inc., providing long-term availability and supply chain continuity compared to the obsolete RT9214PS.

Duty Cycle Consideration: The RT8120FGS maximum duty cycle of 85% is lower than the RT9214PS 100% specification. Applications requiring duty cycles exceeding 85% must be evaluated for compatibility with the substitute device.

Additional Control Features: The RT8120FGS includes an Enable control feature in addition to phase control, providing enhanced functionality without compromising base step-down regulation capability.

Frequently Asked Questions (FAQ)

Q: Can the RT8120FGS directly replace the RT9214PS without PCB modifications?

A: Yes. Both devices use the 8-SOIC (0.154", 3.90mm Width) package with identical pinout compatibility. No PCB layout changes are required for package substitution.

Q: What is the impact of the RT8120FGS 85% maximum duty cycle versus the RT9214PS 100% specification?

A: The duty cycle difference affects the minimum output voltage achievable in step-down operation. Applications operating at or near 100% duty cycle must be evaluated to confirm the 85% maximum duty cycle of the RT8120FGS meets output voltage requirements. If the application requires duty cycles exceeding 85%, the RT8120FGS is not suitable.

Q: Are there supply voltage differences between the two devices?

A: The RT8120FGS supply voltage range (3V ~ 13.2V) is broader than the RT9214PS specified range (5V, 12V). The RT8120FGS will operate correctly across all RT9214PS supply conditions and extends operation to lower supply voltages (3V minimum).

Q: Does the RT8120FGS Enable feature affect compatibility?

A: No. The Enable feature is an additional control capability that does not interfere with standard step-down operation. Designs not utilizing the Enable function will operate identically to the RT9214PS.

Q: Are both devices RoHS compliant?

A: Yes. Both the RT9214PS and RT8120FGS are ROHS3 compliant and maintain identical MSL 3 (168 Hours) moisture sensitivity ratings.

Q: Why is the RT9214PS classified as obsolete?

A: The RT9214PS is no longer manufactured by Richtek USA Inc. The RT8120FGS represents the active equivalent in the Richtek product portfolio for buck regulator controller applications in this package class.