RT7736EGE Equivalent & Substitute Parts

Part Overview

The RT7736EGE 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 RT7736EGE is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Active alternatives within the RT7736 series provide identical electrical and mechanical specifications while maintaining current product status and supply availability.

Key Parameters

Parameter	Value
Manufacturer	Richtek USA Inc.
Category	Power Management (PMIC)
Topology	Flyback
Output Isolation	Isolated
Voltage - Supply (Vcc/Vdd)	12V ~ 25V
Voltage - Start Up	14.5 V
Frequency - Switching	65kHz
Duty Cycle	75%
Fault Protection	Current Limiting, Over Load, Over Voltage, Short Circuit
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	SOT-23-6
Mounting Type	Surface Mount
Series	SmartJitter™
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the RT7736EGE is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish valid substitutes:

Identical topology: Flyback converter
Identical output isolation: Isolated
Identical supply voltage range: 12V ~ 25V
Identical startup voltage: 14.5 V
Identical switching frequency: 65kHz
Identical duty cycle: 75%
Identical fault protection features: Current Limiting, Over Load, Over Voltage, Short Circuit
Identical operating temperature range: -40°C ~ 85°C (TA)
Identical package: SOT-23-6
Identical mounting type: Surface Mount
Identical series designation: SmartJitter™
Identical compliance standards: ROHS3 Compliant, REACH Unaffected

All substitute parts listed below meet these criteria without exception. Substitution is valid based on parametric equivalence alone.

Parameter Comparison

Part Number	Manufacturer	Product Status	Topology	Supply Voltage	Switching Frequency	Duty Cycle	Package	Operating Temperature	Inventory (Pcs)
RT7736EGE	Richtek USA Inc.	Obsolete	Flyback	12V ~ 25V	65kHz	75%	SOT-23-6	-40°C ~ 85°C	5541
RT7736BGE	Richtek USA Inc.	Active	Flyback	12V ~ 25V	65kHz	75%	SOT-23-6	-40°C ~ 85°C	4300
RT7736FGE	Richtek USA Inc.	Active	Flyback	12V ~ 25V	65kHz	75%	SOT-23-6	-40°C ~ 85°C	3700
RT7736GGE	Richtek USA Inc.	Active	Flyback	12V ~ 25V	65kHz	75%	SOT-23-6	-40°C ~ 85°C	4150
RT7736LGE	Richtek USA Inc.	Active	Flyback	12V ~ 25V	65kHz	75%	SOT-23-6	-40°C ~ 85°C	20030

Engineering Selection Recommendations

The RT7736EGE is obsolete and should be replaced with an active equivalent for new designs and ongoing production. All listed substitute parts—RT7736BGE, RT7736FGE, RT7736GGE, and RT7736LGE—are parametrically identical and maintain active product status with Richtek USA Inc.

Selection among active substitutes is based on:

Product availability: RT7736LGE offers the highest inventory (20030 Pcs), followed by RT7736GGE (4150 Pcs), RT7736BGE (4300 Pcs), and RT7736FGE (3700 Pcs)
Packaging format: RT7736GGE is available in Cut Tape (CT) & Digi-Reel® packaging; others have standard packaging
Compliance: All substitutes maintain ROHS3 Compliant and REACH Unaffected status
Moisture sensitivity: All substitutes maintain MSL 3 (168 Hours) rating

All substitute parts are direct functional replacements with no design modifications required.

Frequently Asked Questions (FAQ)

Q: Can RT7736BGE, RT7736FGE, RT7736GGE, or RT7736LGE be used as direct replacements for RT7736EGE?

A: Yes. All substitute parts are parametrically equivalent across electrical specifications (supply voltage, switching frequency, duty cycle, fault protection) and mechanical specifications (SOT-23-6 package, surface mount, operating temperature range). Direct substitution is valid without circuit modifications.

Q: What is the difference between the substitute part numbers?

A: The substitute parts differ only in product status (all are active versus the obsolete RT7736EGE), inventory availability, and packaging format. RT7736GGE is available in Cut Tape (CT) & Digi-Reel® packaging. Electrical and mechanical parameters are identical across all variants.

Q: Which substitute part should be selected for new production?

A: Any active substitute (RT7736BGE, RT7736FGE, RT7736GGE, or RT7736LGE) is suitable for new production. Selection should consider inventory availability and packaging requirements. RT7736LGE provides the highest stock level.

Q: Are all substitutes RoHS and REACH compliant?

A: Yes. All substitute parts maintain ROHS3 Compliant status and REACH Unaffected designation, matching the compliance profile of the original RT7736EGE.

Q: Is the SOT-23-6 package identical across all parts?

A: Yes. All parts use SOT-23-6 surface mount package with identical pinout and mechanical dimensions. No PCB layout modifications are required for substitution.

Q: What is the moisture sensitivity level for these parts?

A: All parts, including substitutes, maintain MSL 3 (168 Hours) rating. Standard moisture control procedures during storage and handling apply.

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