FDMF6833C Half Bridge Driver Equivalent & Substitute Parts

Part Overview

The FDMF6833C is a half bridge driver IC manufactured by onsemi, designed for synchronous buck converter applications with a 50A output capability. This component integrates DrMOS technology in a 40-PQFN (6x6) package and operates across a 4.5V to 5.5V supply voltage range with load voltages from 3V to 24V. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

FDMF6833C

onsemiIn Stock: 757FDMF6833C Datasheet

Current PartRFQ

SIC780CD-T1-GE3

Vishay SiliconixIn Stock: 17636SIC780CD-T1-GE3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDMF6833C is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Output configuration must be half bridge
• Current rating must meet or exceed 50A per channel
• Supply voltage range must encompass 4.5V to 5.5V
• Load voltage range must support 3V to 24V operation
• Operating temperature range must cover -40°C to 150°C
• Interface must be PWM-compatible
• Technology must be DrMOS-based
• Fault protection must include over temperature, shoot-through, and UVLO functions

Mechanical & Compliance Requirements:

• Surface mount mounting type
• RoHS3 compliance
• MSL rating of 1 (unlimited moisture sensitivity)

The SIC780CD-T1-GE3 from Vishay Siliconix meets these substitution criteria as an active product with equivalent electrical specifications and enhanced feature set.

Parameter Comparison

Engineering Selection Recommendations

The SIC780CD-T1-GE3 serves as a functional equivalent for the obsolete FDMF6833C in synchronous buck converter applications. Both components maintain identical electrical specifications for supply voltage, output current, operating temperature range, and core protection features. The SIC780CD-T1-GE3 is actively manufactured and maintains full RoHS3 compliance, providing supply chain continuity for legacy system support and new designs.

The primary design consideration is the load voltage range differential: the FDMF6833C supports 3V to 24V while the SIC780CD-T1-GE3 operates from 4.5V to 18V. Applications requiring operation below 4.5V load voltage or above 18V load voltage require alternative component evaluation.

Package form factor differences exist between the 40-PowerTFQFN (FDMF6833C) and PowerPAK® MLP66-40 (SIC780CD-T1-GE3), necessitating PCB layout modifications for direct substitution. The SIC780CD-T1-GE3 includes diode emulation functionality as an additional feature not present in the original component.

Frequently Asked Questions (FAQ)

Q: Can the SIC780CD-T1-GE3 directly replace the FDMF6833C without PCB modifications?

A: No. While electrical specifications are compatible, the package form factors differ (40-PowerTFQFN versus PowerPAK® MLP66-40). PCB layout redesign is required for physical mounting and thermal management optimization.

Q: What is the significance of the load voltage range difference?

A: The FDMF6833C supports load voltages from 3V to 24V, while the SIC780CD-T1-GE3 operates from 4.5V to 18V. Applications with load voltages below 4.5V or above 18V cannot use the SIC780CD-T1-GE3 as a substitute and require alternative component selection.

Q: Does the additional diode emulation feature in the SIC780CD-T1-GE3 affect compatibility?

A: Diode emulation is an additional feature that enhances performance in light-load conditions. Its presence does not create incompatibility; systems designed for the FDMF6833C will function with the SIC780CD-T1-GE3, with potential performance improvements in specific operating scenarios.

Q: Are both components RoHS3 compliant?

A: Yes. Both the FDMF6833C and SIC780CD-T1-GE3 maintain ROHS3 compliance and MSL rating of 1 (unlimited moisture sensitivity), ensuring equivalent environmental and regulatory compliance.

Q: Why is the FDMF6833C obsolete while the SIC780CD-T1-GE3 remains active?

A: Product lifecycle decisions are manufacturer-specific. The SIC780CD-T1-GE3 remains in active production, providing long-term availability for new designs and legacy system support where the FDMF6833C is no longer available.