RT9214GS Equivalent & Substitute Parts

Part Overview

The RT9214GS 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. The RT9214GS is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	RT9214GS
Manufacturer	Richtek USA Inc.
Category	Power Management (PMIC)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Output Type	Transistor Driver
Function	Step-Down
Output Configuration	Positive
Topology	Buck
Number of Outputs	1
Output Phases	1
Voltage - Supply (Vcc/Vdd)	5V, 12V
Frequency - Switching	300kHz
Duty Cycle (Max)	100%
Synchronous Rectifier	Yes
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the RT9214GS are identified based on strict alignment with the following critical parameters:

Package compatibility: 8-SOIC (0.154", 3.90mm Width)
Functional topology: Buck regulator with positive output step-down configuration
Output type: Transistor driver with single output phase
Switching frequency: 300kHz
Synchronous rectifier capability: Yes
Operating temperature range: -40°C ~ 85°C (TA)
Supply voltage compatibility: Overlapping input voltage range
Compliance certifications: ROHS3, REACH Unaffected, EAR99

The RT8120FGS meets these substitution criteria as an active product from the same manufacturer with identical package, topology, switching frequency, and environmental specifications.

Parameter Comparison

Parameter	RT9214GS	RT8120FGS	Compatibility Notes
Manufacturer	Richtek USA Inc.	Richtek USA Inc.	Same manufacturer
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	Identical package
Output Type	Transistor Driver	Transistor Driver	Identical output type
Function	Step-Down	Step-Down	Identical function
Output Configuration	Positive	Positive	Identical configuration
Topology	Buck	Buck	Identical topology
Number of Outputs	1	1	Identical output count
Output Phases	1	1	Identical phase configuration
Voltage - Supply (Vcc/Vdd)	5V, 12V	3V ~ 13.2V	RT8120FGS range encompasses RT9214GS specifications
Frequency - Switching	300kHz	300kHz	Identical switching frequency
Duty Cycle (Max)	100%	85%	RT8120FGS has lower maximum duty cycle
Synchronous Rectifier	Yes	Yes	Both include synchronous rectifier
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	Identical temperature range
Mounting Type	Surface Mount	Surface Mount	Identical mounting type
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	Identical MSL rating
Product Status	Obsolete	Active	RT8120FGS is actively manufactured
Control Features	Phase Control	Enable, Phase Control	RT8120FGS includes additional Enable feature

Engineering Selection Recommendations

The RT8120FGS is the primary substitute for the obsolete RT9214GS based on the following engineering criteria:

Product Status & Availability: The RT8120FGS is an active product with current manufacturing support from Richtek USA Inc., ensuring long-term availability and supply chain continuity compared to the obsolete RT9214GS.

Compliance & Certifications: Both parts maintain identical ROHS3 compliance, REACH Unaffected status, and EAR99 classification, ensuring regulatory compatibility in existing designs.

Electrical & Mechanical Compatibility: The RT8120FGS shares identical package geometry (8-SOIC), switching frequency (300kHz), operating temperature range (-40°C ~ 85°C), and synchronous rectifier capability with the RT9214GS.

Supply Voltage Range: The RT8120FGS input voltage specification (3V ~ 13.2V) encompasses the RT9214GS operating points (5V, 12V), providing broader design flexibility.

Design Consideration: The RT8120FGS maximum duty cycle is 85% compared to the RT9214GS 100%. Applications requiring 100% duty cycle operation must evaluate circuit topology modifications or alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the RT8120FGS directly replace the RT9214GS in existing PCB layouts?

A: Yes. Both parts use identical 8-SOIC (0.154", 3.90mm Width) packaging with the same pinout compatibility for surface mount assembly. No PCB redesign is required for package substitution.

Q: What is the primary difference between these parts?

A: The RT8120FGS has a maximum duty cycle of 85% versus the RT9214GS 100%. Additionally, the RT8120FGS includes an Enable control feature not present in the RT9214GS. The RT8120FGS also supports a broader input voltage range (3V ~ 13.2V) compared to the RT9214GS discrete supply voltages (5V, 12V).

Q: Are there compliance or certification differences?

A: No. Both parts maintain identical ROHS3 compliance, REACH Unaffected status, Moisture Sensitivity Level 3 (168 Hours), and EAR99 classification.

Q: Why is the RT9214GS obsolete?

A: The RT9214GS is classified as obsolete by the manufacturer. The RT8120FGS represents the active product line continuation with enhanced features and broader specifications.

Q: What applications are affected by the 85% duty cycle limitation of the RT8120FGS?

A: Applications requiring 100% duty cycle operation (such as extremely low output voltage step-down ratios or specific control topologies) may require alternative component selection or circuit redesign to accommodate the 85% maximum duty cycle of the RT8120FGS.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both the RT9214GS and RT8120FGS operate across -40°C ~ 85°C (TA), ensuring thermal compatibility in equivalent applications.

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