RT7736DGE Equivalent & Substitute Parts

Part Overview

The RT7736DGE is an offline switching flyback converter IC manufactured by Richtek USA Inc., designed for isolated power management applications. This device operates at 65kHz switching frequency with integrated current limiting, overload, overvoltage, and short circuit protection. The RT7736DGE is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Active alternatives within the RT7736 series maintain identical electrical and mechanical specifications, ensuring direct functional compatibility.

Key Parameters

Parameter	Value
Topology	Flyback
Output Isolation	Isolated
Voltage Supply Range (Vcc/Vdd)	12V ~ 25V
Startup Voltage	14.5V
Switching Frequency	65kHz
Duty Cycle	75%
Fault Protection	Current Limiting, Overload, Overvoltage, Short Circuit
Operating Temperature Range	-40°C ~ 85°C
Package	SOT-23-6
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the RT7736DGE is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute parts RT7736BGE, RT7736FGE, RT7736GGE, and RT7736LGE are all members of the RT7736 base product family and maintain identical specifications in the following key areas:

Topology: Flyback converter architecture
Output Isolation: Isolated configuration
Supply voltage range: 12V ~ 25V
Startup voltage: 14.5V
Switching frequency: 65kHz
Duty cycle: 75%
Fault protection features: Current limiting, overload, overvoltage, short circuit
Operating temperature: -40°C ~ 85°C
Package: SOT-23-6
Compliance: ROHS3, REACH Unaffected

All substitute parts are pin-compatible and functionally equivalent, differing only in product status and packaging options.

Parameter Comparison

Part Number	Manufacturer	Product Status	Topology	Supply Voltage	Switching Frequency	Package	Inventory Status
RT7736DGE	Richtek USA Inc.	Obsolete	Flyback	12V ~ 25V	65kHz	SOT-23-6	1017 Pcs
RT7736BGE	Richtek USA Inc.	Active	Flyback	12V ~ 25V	65kHz	SOT-23-6	4300 Pcs
RT7736FGE	Richtek USA Inc.	Active	Flyback	12V ~ 25V	65kHz	SOT-23-6	3700 Pcs
RT7736GGE	Richtek USA Inc.	Active	Flyback	12V ~ 25V	65kHz	SOT-23-6	4150 Pcs
RT7736LGE	Richtek USA Inc.	Active	Flyback	12V ~ 25V	65kHz	SOT-23-6	20030 Pcs

Engineering Selection Recommendations

Selection among RT7736 series substitutes is based on product status and supply availability. The RT7736DGE is obsolete and should be replaced with an active equivalent for new designs and ongoing production. RT7736BGE, RT7736FGE, RT7736GGE, and RT7736LGE are all active products with identical electrical specifications and SOT-23-6 packaging.

RT7736LGE offers the highest inventory availability at 20030 units, followed by RT7736BGE at 4300 units. All substitute parts maintain ROHS3 compliance and identical MSL ratings. The choice between active alternatives depends on supply chain requirements and packaging preferences, as RT7736GGE is available in Cut Tape (CT) and Digi-Reel® packaging options.

Frequently Asked Questions (FAQ)

Q: Can RT7736BGE, RT7736FGE, RT7736GGE, and RT7736LGE be used interchangeably with RT7736DGE?

A: Yes. All substitute parts are pin-compatible and electrically equivalent. They share identical topology, supply voltage range, switching frequency, duty cycle, fault protection features, operating temperature range, and SOT-23-6 packaging. Direct substitution is supported without circuit modifications.

Q: Why is the RT7736DGE listed as obsolete?

A: The RT7736DGE has reached end-of-life status. Active alternatives within the RT7736 series provide identical functionality and are recommended for new designs and production continuity.

Q: Are there packaging differences among the substitute parts?

A: RT7736GGE is available in Cut Tape (CT) and Digi-Reel® packaging. RT7736BGE, RT7736FGE, and RT7736LGE packaging specifications are not differentiated in the provided data. All parts use SOT-23-6 surface mount package.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All RT7736 series parts are ROHS3 compliant, REACH unaffected, and carry identical MSL ratings of 3 (168 Hours). Compliance certifications are consistent across the product family.

Q: Which substitute part should be selected for maximum supply availability?

A: RT7736LGE provides the highest inventory level at 20030 units in stock, followed by RT7736BGE at 4300 units. Both are active products suitable for production applications.

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